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1. KCNC2 variants of uncertain significance are also associated to various forms of epilepsy

Author: Simone Seiffert, Manuela Pendziwiat, Ulrike B. S. Hedrich, Ingo Helbig, Yvonne Weber, and Niklas Schwarz
Subjects: potassium channel, developmental and epileptic encephalopathy, KCNC2 electrophysiology, functional analysis, precision medicine, Neurology. Diseases of the nervous system, RC346-429
Abstract: Recently, de novo variants in KCNC2, coding for the potassium channel subunit KV3.2, have been described as causative for various forms of epilepsy including genetic generalized epilepsy (GGE) and developmental and epileptic encephalopathy (DEE). Here, we report the functional characteristics of three additional KCNC2 variants of uncertain significance and one variant classified as pathogenic. Electrophysiological studies were performed in Xenopus laevis oocytes. The data presented here support that KCNC2 variants with uncertain significance may also be causative for various forms of epilepsy, as they show changes in the current amplitude and activation and deactivation kinetics of the channel, depending on the variant. In addition, we investigated the effect of valproic acid on KV3.2, as several patients carrying pathogenic variants in the KCNC2 gene achieved significant seizure reduction or seizure freedom with this drug. However, in our electrophysiological investigations, no change on the behavior of KV3.2 channels could be observed, suggesting that the therapeutic effect of VPA may be explained by other mechanisms.
Published: 2023
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2. Modulating effects of FGF12 variants on NaV1.2 and NaV1.6 being associated with developmental and epileptic encephalopathy and Autism spectrum disorder: A case series

Author: Simone Seiffert, Manuela Pendziwiat, Tatjana Bierhals, Himanshu Goel, Niklas Schwarz, Amelie van der Ven, Christian Malte Boßelmann, Johannes Lemke, Steffen Syrbe, Marjolein Hanna Willemsen, Ulrike Barbara Stefanie Hedrich, Ingo Helbig, and Yvonne Weber
Subjects: FGF12, Sodium channels, Epilepsy, SCN2A, SCN8A, Autism spectrum disorder, Medicine, Medicine (General), R5-920
Abstract: Summary: Objective: Fibroblast Growth Factor 12 (FGF12) may represent an important modulator of neuronal network activity and has been associated with developmental and epileptic encephalopathy (DEE). We sought to identify the underlying pathomechanism of FGF12-related disorders. Methods: Patients with pathogenic variants in FGF12 were identified through published case reports, GeneMatcher and whole exome sequencing of own case collections. The functional consequences of two missense and two copy number variants (CNVs) were studied by co-expression of wildtype and mutant FGF12 in neuronal-like cells (ND7/23) with the sodium channels NaV1.2 or NaV1.6, including their beta-1 and beta-2 sodium channel subunits (SCN1B and SCN2B). Results: Four variants in FGF12 were identified for functional analysis: one novel FGF12 variant in a patient with autism spectrum disorder and three variants from previously published patients affected by DEE. We demonstrate the differential regulating effects of wildtype and mutant FGF12 on NaV1.2 and NaV1.6 channels. Here, FGF12 variants lead to a complex kinetic influence on NaV1.2 and NaV1.6, including loss- as well as gain-of function changes in fast and slow inactivation. Interpretation: We could demonstrate the detailed regulating effect of FGF12 on NaV1.2 and NaV1.6 and confirmed the complex effect of FGF12 on neuronal network activity. Our findings expand the phenotypic spectrum related to FGF12 variants and elucidate the underlying pathomechanism. Specific variants in FGF12-associated disorders may be amenable to precision treatment with sodium channel blockers. Funding: DFG, BMBF, Hartwell Foundation, National Institute for Neurological Disorders and Stroke, IDDRC, ENGIN, NIH, ITMAT, ILAE, RES and GRIN
Published: 2022
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3. Whole‐exome and HLA sequencing in Febrile infection‐related epilepsy syndrome

Author: Ingo Helbig, Giulia Barcia, Manuela Pendziwiat, Shiva Ganesan, Stefanie H. Mueller, Katherine L. Helbig, Priya Vaidiswaran, Julie Xian, Peter D. Galer, Zaid Afawi, Nicola Specchio, Gerhard Kluger, Gregor Kuhlenbäumer, Silke Appenzeller, Michael Wittig, Uri Kramer, Andreas vanBaalen, Rima Nabbout, and FIRES Genetics Study Group
Subjects: Neurosciences. Biological psychiatry. Neuropsychiatry, RC321-571, Neurology. Diseases of the nervous system, RC346-429
Abstract: Abstract Febrile infection‐related epilepsy syndrome (FIRES) is a devastating epilepsy characterized by new‐onset refractory status epilepticus with a prior febrile infection. We performed exome sequencing in 50 individuals with FIRES, including 27 patient–parent trios and 23 single probands, none of whom had pathogenic variants in established genes for epilepsies or neurodevelopmental disorders. We also performed HLA sequencing in 29 individuals with FIRES and 529 controls, which failed to identify prominent HLA alleles. The genetic architecture of FIRES is substantially different from other developmental and epileptic encephalopathies, and the underlying etiology remains elusive, requiring novel approaches to identify the underlying causative factors.
Published: 2020
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4. Intronic ATTTC repeat expansions in STARD7 in familial adult myoclonic epilepsy linked to chromosome 2

Author: Mark A. Corbett, Thessa Kroes, Liana Veneziano, Mark F. Bennett, Rahel Florian, Amy L. Schneider, Antonietta Coppola, Laura Licchetta, Silvana Franceschetti, Antonio Suppa, Aaron Wenger, Davide Mei, Manuela Pendziwiat, Sabine Kaya, Massimo Delledonne, Rachel Straussberg, Luciano Xumerle, Brigid Regan, Douglas Crompton, Anne-Fleur van Rootselaar, Anthony Correll, Rachael Catford, Francesca Bisulli, Shreyasee Chakraborty, Sara Baldassari, Paolo Tinuper, Kirston Barton, Shaun Carswell, Martin Smith, Alfredo Berardelli, Renee Carroll, Alison Gardner, Kathryn L. Friend, Ilan Blatt, Michele Iacomino, Carlo Di Bonaventura, Salvatore Striano, Julien Buratti, Boris Keren, Caroline Nava, Sylvie Forlani, Gabrielle Rudolf, Edouard Hirsch, Eric Leguern, Pierre Labauge, Simona Balestrini, Josemir W. Sander, Zaid Afawi, Ingo Helbig, Hiroyuki Ishiura, Shoji Tsuji, Sanjay M. Sisodiya, Giorgio Casari, Lynette G. Sadleir, Riaan van Coller, Marina A. J. Tijssen, Karl Martin Klein, Arn M. J. M. van den Maagdenberg, Federico Zara, Renzo Guerrini, Samuel F. Berkovic, Tommaso Pippucci, Laura Canafoglia, Melanie Bahlo, Pasquale Striano, Ingrid E. Scheffer, Francesco Brancati, Christel Depienne, and Jozef Gecz
Subjects: Science
Abstract: Familial cortical myoclonic tremor (FAME) has so far been mapped to regions on chromosome 2, 3, 5 and 8 and pentameric repeat expansions in SAMD12 were identified as cause of FAME1. Here, Corbett et al. identify ATTTT/ATTTC repeat expansions in intron 1 of STARD7 in individuals with FAME2.”
Published: 2019
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5. Biallelic VARS variants cause developmental encephalopathy with microcephaly that is recapitulated in vars knockout zebrafish

Author: Aleksandra Siekierska, Hannah Stamberger, Tine Deconinck, Stephanie N. Oprescu, Michèle Partoens, Yifan Zhang, Jo Sourbron, Elias Adriaenssens, Patrick Mullen, Patrick Wiencek, Katia Hardies, Jeong-Soo Lee, Hoi-Khoanh Giong, Felix Distelmaier, Orly Elpeleg, Katherine L. Helbig, Joseph Hersh, Sedat Isikay, Elizabeth Jordan, Ender Karaca, Angela Kecskes, James R. Lupski, Reka Kovacs-Nagy, Patrick May, Vinodh Narayanan, Manuela Pendziwiat, Keri Ramsey, Sampathkumar Rangasamy, Deepali N. Shinde, Ronen Spiegel, Vincent Timmerman, Sarah von Spiczak, Ingo Helbig, C4RCD Research Group, AR working group of the EuroEPINOMICS RES Consortium, Sarah Weckhuysen, Christopher Francklyn, Anthony Antonellis, Peter de Witte, and Peter De Jonghe
Subjects: Science
Abstract: tRNAs are linked with their cognate amino acid by aminoacyl tRNA synthetases (ARS). Here, the authors report a developmental encephalopathy associated with biallelic VARS variants (valyl-tRNA synthetase) that lead to loss of function, as determined by several in vitro assays and a vars knockout zebrafish model.
Published: 2019
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6. Deep-Phenotyping the Less Severe Spectrum of PIGT Deficiency and Linking the Gene to Myoclonic Atonic Seizures

Author: Allan Bayat, Manuela Pendziwiat, Ewa Obersztyn, Paula Goldenberg, Pia Zacher, Jan Henje Döring, Steffen Syrbe, Amber Begtrup, Artem Borovikov, Artem Sharkov, Aneta Karasińska, Maria Giżewska, Wendy Mitchell, Eva Morava, Rikke S. Møller, and Guido Rubboli
Subjects: myoclonic-atonic seizures, generalized seizures, disease severity, developmental delay, glycosylphosphatidylinositol biosynthesis defects, inherited glycosylphosphatidylinositol-anchored protein (GPI-AP) deficiency, Genetics, QH426-470
Abstract: The two aims of this study were (i) to describe and expand the phenotypic spectrum of PIGT deficiency in affected individuals harboring the c.1582G>A; p.Val528Met or the c.1580A > G; p.Asn527Ser variant in either homozygous or compound heterozygous state, and (ii) to identify potential genotype-phenotype correlations and any differences in disease severity among individuals with and without the PIGT variants. The existing literature was searched to identify individuals with and without the two variants. A detailed phenotypic assessment was performed of 25 individuals (both novel and previously published) with the two PIGT variants. We compared severity of disease between individuals with and without these PIGT variants. Twenty-four individuals carried the PIGT variant Val528Met in either homozygous or compound heterozygous state, and one individual displayed the Asn527Ser variant in a compound heterozygous state. Disease severity in the individual with the Asn527Ser variant was compatible with that in the individuals harboring the Val528Met variant. While individuals without the Asn527Ser or Val528Met variant had focal epilepsy, profound developmental delay (DD), and risk of premature death, those with either of the two variants had moderate to severe DD and later onset of epilepsy with both focal and generalized seizures. Individuals homozygous for the Val528Met variant generally became seizure-free on monotherapy with antiepileptic drugs, compared to other PIGT individuals who were pharmaco-resistant. Two patients were diagnosed with myoclonic-atonic seizures, and a single patient was diagnosed with eyelid myoclonia. Our comprehensive analysis of this large cohort of previously published and novel individuals with PIGT variants broadens the phenotypical spectrum and shows that both Asn527Ser and Val528Met are associated with a milder phenotype and less severe outcome. Our data show that PIGT is a new candidate gene for myoclonic atonic epilepsy. Our genotype-phenotype correlation will be useful for future genetic counseling. Natural history studies of this mild spectrum of PIGT-related disorder may shed light on hitherto unknown aspects of this rare disorder.
Published: 2021
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7. Characterization of glycosylphosphatidylinositol biosynthesis defects by clinical features, flow cytometry, and automated image analysis

Author: Alexej Knaus, Jean Tori Pantel, Manuela Pendziwiat, Nurulhuda Hajjir, Max Zhao, Tzung-Chien Hsieh, Max Schubach, Yaron Gurovich, Nicole Fleischer, Marten Jäger, Sebastian Köhler, Hiltrud Muhle, Christian Korff, Rikke S. Møller, Allan Bayat, Patrick Calvas, Nicolas Chassaing, Hannah Warren, Steven Skinner, Raymond Louie, Christina Evers, Marc Bohn, Hans-Jürgen Christen, Myrthe van den Born, Ewa Obersztyn, Agnieszka Charzewska, Milda Endziniene, Fanny Kortüm, Natasha Brown, Peter N. Robinson, Helenius J. Schelhaas, Yvonne Weber, Ingo Helbig, Stefan Mundlos, Denise Horn, and Peter M. Krawitz
Subjects: GPI, Anchor biosynthesis defects, Automated image analysis, Gene, Prediction, Medicine, Genetics, QH426-470
Abstract: Abstract Background Glycosylphosphatidylinositol biosynthesis defects (GPIBDs) cause a group of phenotypically overlapping recessive syndromes with intellectual disability, for which pathogenic mutations have been described in 16 genes of the corresponding molecular pathway. An elevated serum activity of alkaline phosphatase (AP), a GPI-linked enzyme, has been used to assign GPIBDs to the phenotypic series of hyperphosphatasia with mental retardation syndrome (HPMRS) and to distinguish them from another subset of GPIBDs, termed multiple congenital anomalies hypotonia seizures syndrome (MCAHS). However, the increasing number of individuals with a GPIBD shows that hyperphosphatasia is a variable feature that is not ideal for a clinical classification. Methods We studied the discriminatory power of multiple GPI-linked substrates that were assessed by flow cytometry in blood cells and fibroblasts of 39 and 14 individuals with a GPIBD, respectively. On the phenotypic level, we evaluated the frequency of occurrence of clinical symptoms and analyzed the performance of computer-assisted image analysis of the facial gestalt in 91 individuals. Results We found that certain malformations such as Morbus Hirschsprung and diaphragmatic defects are more likely to be associated with particular gene defects (PIGV, PGAP3, PIGN). However, especially at the severe end of the clinical spectrum of HPMRS, there is a high phenotypic overlap with MCAHS. Elevation of AP has also been documented in some of the individuals with MCAHS, namely those with PIGA mutations. Although the impairment of GPI-linked substrates is supposed to play the key role in the pathophysiology of GPIBDs, we could not observe gene-specific profiles for flow cytometric markers or a correlation between their cell surface levels and the severity of the phenotype. In contrast, it was facial recognition software that achieved the highest accuracy in predicting the disease-causing gene in a GPIBD. Conclusions Due to the overlapping clinical spectrum of both HPMRS and MCAHS in the majority of affected individuals, the elevation of AP and the reduced surface levels of GPI-linked markers in both groups, a common classification as GPIBDs is recommended. The effectiveness of computer-assisted gestalt analysis for the correct gene inference in a GPIBD and probably beyond is remarkable and illustrates how the information contained in human faces is pivotal in the delineation of genetic entities.
Published: 2018
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8. Genotype-phenotype correlations in SCN8A-related disorders reveal prognostic and therapeutic implications

Author: Roseline Caume, M Scott Perry, Massimo Mastrangelo, Margarete Koch-Hogrebe, Pasquale Striano, Karen Müller-Schlüter, Petra Laššuthová, Monisa D. Wagner, Ingo Helbig, Stephan Lauxmann, Emmanuel Scalais, Marie-Cécile Nassogne, Silvia Masnada, Henrike O. Heyne, Konrad Platzer, Frederic Bilan, Chloe A Stutterd, Sonja Walsh, Katrine M Johannesen, Damien Lederer, Ngoc Minh Le, Christina Fenger, Daniel Tibussek, Lukas Sonnenberg, Andrea Berger, Yuanyuan Liu, Mikhail Abramov, Karen E. Wain, Sergey Korostelev, P Y Billie Au, Elena L. Dadali, An-Sofie Schoonjans, Cornelia Betzler, Artem Borovikov, Johanna Krüger, Maert Rannap, Sebastian Lebon, Nils A Koch, Nancy Eisenhauer, Judith Kroell-Seger, Julian Schubert, Marije Meuwissen, Caroline Lund, Mark Fitzgerald, Federico Zara, Siddharth Srivastava, Claudia M Bonardi, Pia Zacher, Haim Bassan, Arve Vøllo, Katherine B. Howell, Francesca Darra, Guido Rubboli, Stephen W. Scherer, Bénédicte Gérard, Stefano Sartori, Annapurna Poduri, Helene Verhelst, Katalin Sterbova, Mathilde Nizon, Marketa Vlckova, Christina E. Hoei-Hansen, Renzo Guerrini, Ilya V. Kanivets, Juliann M. Savatt, Johannes Rebstock, Jakob Christensen, Cecilia Altuzarra, Dennis Lal, Judith S. Verhoeven, Agathe Roubertie, Constanze Heine, Dagmar Wieczorek, Ingo Borggraefe, Aster V. E. Harder, Anne Destrée, Wen-Hann Tan, Tobias Brünger, Shoji Ichikawa, Laura Canafoglia, Mahmoud Koko, Sergey Kutsev, Sabine Grønborg, Patrizia Accorsi, Heather E. Olson, Bert van der Zwaag, Cathrine E Gjerulfsen, Patrick May, A. A. Sharkov, M. Mahdi Motazacker, Manuela Pendziwiat, Richard J. Leventer, Anna Jansen, Lucio Giordano, Holger Lerche, Carla Marini, Karl Martin Klein, Eva H. Brilstra, Ahmed Eltokhi, Ethan M. Goldberg, Walid Fazeli, Rikke S. Møller, Dorota Hoffman-Zacharska, Michael Alber, Susanne Ruf, Jennifer L. Howe, Phillis Lakeman, Josua Kegele, Katherine L. Helbig, Marga Buzatu, Alice W Ho, Jan Benda, Ilona Krey, Marion Gérard, Sara Matricardi, Thomas U. Mayer, Philippe Gelisse, Jong M. Rho, Johannes R. Lemke, Pierangelo Veggiotti, Tobias Loddenkemper, Gaetan Lesca, Ulrike B. S. Hedrich, Silvana Franceschetti, Elena Gardella, Irina Mishina, María Vaccarezza, Timo Roser, Public Health Sciences, Mental Health and Wellbeing research group, Neurogenetics, Neuroprotection & Neuromodulation, Pediatrics, Human Genetics, ANS - Complex Trait Genetics, ARD - Amsterdam Reproduction and Development, Human genetics, and Amsterdam Reproduction & Development (AR&D)
Subjects: medicine.medical_specialty, SCN8A, Gastroenterology, Epilepsy, Sodium channel blocker, Neurodevelopmental disorder, Seizures, Intellectual Disability, Internal medicine, medicine, Humans, Missense mutation, genetics, Generalized epilepsy, Genetic Association Studies, Benign familial infantile epilepsy, Generalized, business.industry, Infant, personalized medicine, Prognosis, medicine.disease, Phenotype, Settore MED/39 - Neuropsichiatria Infantile, NAV1.6 Voltage-Gated Sodium Channel, Mutation, epilepsy, Original Article, Epilepsy, Generalized, Human medicine, Neurology (clinical), Age of onset, business, Epileptic Syndromes, Sodium Channel Blockers
Abstract: We report detailed functional analyses and genotype-phenotype correlations in 392 individuals carrying disease-causing variants in SCN8A, encoding the voltage-gated Na+ channel Nav1.6, with the aim of describing clinical phenotypes related to functional effects. Six different clinical subgroups were identified: Group 1, benign familial infantile epilepsy (n = 15, normal cognition, treatable seizures); Group 2, intermediate epilepsy (n = 33, mild intellectual disability, partially pharmaco-responsive); Group 3, developmental and epileptic encephalopathy (n = 177, severe intellectual disability, majority pharmaco-resistant); Group 4, generalized epilepsy (n = 20, mild to moderate intellectual disability, frequently with absence seizures); Group 5, unclassifiable epilepsy (n = 127); and Group 6, neurodevelopmental disorder without epilepsy (n = 20, mild to moderate intellectual disability). Those in Groups 1–3 presented with focal or multifocal seizures (median age of onset: 4 months) and focal epileptiform discharges, whereas the onset of seizures in patients with generalized epilepsy was later (median: 42 months) with generalized epileptiform discharges. We performed functional studies expressing missense variants in ND7/23 neuroblastoma cells and primary neuronal cultures using recombinant tetrodotoxin-insensitive human Nav1.6 channels and whole-cell patch-clamping. Two variants causing developmental and epileptic encephalopathy showed a strong gain-of-function (hyperpolarizing shift of steady-state activation, strongly increased neuronal firing rate) and one variant causing benign familial infantile epilepsy or intermediate epilepsy showed a mild gain-of-function (defective fast inactivation, less increased firing). In contrast, all three variants causing generalized epilepsy induced a loss-of-function (reduced current amplitudes, depolarizing shift of steady-state activation, reduced neuronal firing). Functional effects were known for 170 individuals. All 136 individuals carrying a functionally tested gain-of-function variant had either focal (n = 97, Groups 1–3) or unclassifiable (n = 39) epilepsy, whereas 34 individuals with a loss-of-function variant had either generalized (n = 14), no (n = 11) or unclassifiable (n = 6) epilepsy; only three had developmental and epileptic encephalopathy. Computational modelling in the gain-of-function group revealed a significant correlation between the severity of the electrophysiological and clinical phenotypes. Gain-of-function variant carriers responded significantly better to sodium channel blockers than to other anti-seizure medications, and the same applied for all individuals in Groups 1–3. In conclusion, our data reveal clear genotype-phenotype correlations between age at seizure onset, type of epilepsy and gain- or loss-of-function effects of SCN8A variants. Generalized epilepsy with absence seizures is the main epilepsy phenotype of loss-of-function variant carriers and the extent of the electrophysiological dysfunction of the gain-of-function variants is a main determinant of the severity of the clinical phenotype in focal epilepsies. Our pharmacological data indicate that sodium channel blockers present a treatment option in SCN8A-related focal epilepsy with onset in the first year of life.
Published: 2022

9. Whole exome sequencing and co‐expression analysis identify an SCN1A variant that modifies pathogenicity in a family with genetic epilepsy and febrile seizures plus

Author: Michael F. Hammer, Yanling Pan, Medhane Cumbay, Manuela Pendziwiat, Zaid Afawi, Hadassah Goldberg‐Stern, Laurel Johnstone, Ingo Helbig, and Theodore R. Cummins
Subjects: NAV1.1 Voltage-Gated Sodium Channel, Epilepsy, HEK293 Cells, Phenotype, Virulence, Neurology, Mutation, Exome Sequencing, Humans, Epilepsies, Myoclonic, Neurology (clinical), Seizures, Febrile
Abstract: Family members carrying the same SCN1A variant often exhibit differences in the clinical severity of epilepsy. This variable expressivity suggests that other factors aside from the primary sodium channel variant influence the clinical manifestation. However, identifying such factors has proven challenging in humans.We perform whole exome sequencing (WES) in a large family in which an SCN1A variant (p.K1372E) is segregating that is associated with a broad spectrum of phenotypes ranging from lack of epilepsy, to febrile seizures and absence seizures, to Dravet syndrome. We assessed the hypothesis that the severity of the SCN1A-related phenotype was affected by alternate alleles at a modifier locus (or loci).One of our top candidates identified by WES was a second variant in the SCN1A gene (p.L375S) that was shared exclusively by unaffected carriers of the K1372E allele. To test the hypothesized that L375S variant nullifies the loss-of-function effect of K1372E, we transiently expressed Nav1.1 carrying the two variants in HEK293T cells and compared their biophysical properties with the wild-type (WT) variant, and then co-expressed WT with K1372E or L375S with K1372E in equal quantity and tested the functional consequence. The data demonstrated that co-expression of the L375S and K1372E alleles reversed the loss-of-function property brought by the K1372E variant, whereas WT-K1372E co-expression remained partial loss-of-function.These results support the hypothesis that L375S counteracts the loss-of-function effect of K1372E such that individuals carrying both alleles in trans do not present epilepsy-related symptoms. We demonstrate that monogenic epilepsies with wide expressivity can be modified by additional variants in the disease gene, providing a novel framework for the gene-phenotype relationship in genetic epilepsies.
Published: 2022

10. PIGN encephalopathy: Characterizing the epileptology

Author: Allan Bayat, Guillem de Valles‐Ibáñez, Manuela Pendziwiat, Alexej Knaus, Kerstin Alt, Elisa Biamino, Annette Bley, Sophie Calvert, Patrick Carney, Alfonso Caro‐Llopis, Berten Ceulemans, Janice Cousin, Suzanne Davis, Vincent des Portes, Patrick Edery, Eleina England, Carlos Ferreira, Jeremy Freeman, Blanca Gener, Magali Gorce, Delphine Heron, Michael S. Hildebrand, Aleksandra Jezela‐Stanek, Pierre‐Simon Jouk, Boris Keren, Katja Kloth, Gerhard Kluger, Marius Kuhn, Johannes R. Lemke, Hong Li, Francisco Martinez, Caroline Maxton, Heather C. Mefford, Giuseppe Merla, Hanna Mierzewska, Alison Muir, Sandra Monfort, Joost Nicolai, Jennifer Norman, Gina O'Grady, Barbara Oleksy, Carmen Orellana, Laura Elena Orec, Charlotte Peinhardt, Ewa Pronicka, Monica Rosello, Fernando Santos‐Simarro, Eva Maria Christina Schwaibold, Alexander P. A. Stegmann, Constance T. Stumpel, Elzbieta Szczepanik, Iwona Terczyńska, Julien Thevenon, Andreas Tzschach, Patrick Van Bogaert, Roberta Vittorini, Sonja Walsh, Sarah Weckhuysen, Barbara Weissman, Lynne Wolfe, Alexandre Reymond, Pasquelena De Nittis, Annapurna Poduri, Heather Olson, Pasquale Striano, Gaetan Lesca, Ingrid E. Scheffer, Rikke S. Møller, Lynette G. Sadleir, RS: MHeNs - R1 - Cognitive Neuropsychiatry and Clinical Neuroscience, Klinische Neurowetenschappen, MUMC+: MA Med Staf Spec Neurologie (9), and MUMC+: DA KG Lab Specialisten (9)
Subjects: Epilepsy/diagnostic imaging, Drug Resistant Epilepsy, PROTEINS, Electroencephalography, Intellectual Disability/diagnostic imaging, HYPOTONIA-SEIZURES SYNDROME, PHENOTYPE, congenital disorder of glycosylation, CONGENITAL-ANOMALIES, Phenotype, Neurology, Seizures, intellectual disability, Humans, epilepsy, Female, Human medicine, Neurology (clinical), developmental and epileptic encephalopathy, PRENATAL-DIAGNOSIS, Seizures/genetics, GPI-anchoring disorder, MUTATION
Abstract: OBJECTIVE: Epilepsy is common in patients with PIGN diseases due to biallelic variants; however, limited epilepsy phenotyping data have been reported. We describe the epileptology of PIGN encephalopathy. METHODS: We recruited patients with epilepsy due to biallelic PIGN variants and obtained clinical data regarding age at seizure onset/offset and semiology, development, medical history, examination, electroencephalogram, neuroimaging, and treatment. Seizure and epilepsy types were classified. RESULTS: Twenty six patients (13 female) from 26 families were identified, with mean age 7 years (range = 1 month to 21 years; three deceased). Abnormal development at seizure onset was present in 25 of 26. Developmental outcome was most frequently profound (14/26) or severe (11/26). Patients presented with focal motor (12/26), unknown onset motor (5/26), focal impaired awareness (1/26), absence (2/26), myoclonic (2/26), myoclonic-atonic (1/26), and generalized tonic-clonic (2/26) seizures. Twenty of 26 were classified as developmental and epileptic encephalopathy (DEE): 55% (11/20) focal DEE, 30% (6/20) generalized DEE, and 15% (3/20) combined DEE. Six had intellectual disability and epilepsy (ID+E): two generalized and four focal epilepsy. Mean age at seizure onset was 13 months (birth to 10 years), with a lower mean onset in DEE (7 months) compared with ID+E (33 months). Patients with DEE had drug-resistant epilepsy, compared to 4/6 ID+E patients, who were seizure-free. Hyperkinetic movement disorder occurred in 13 of 26 patients. Twenty-seven of 34 variants were novel. Variants were truncating (n = 7), intronic and predicted to affect splicing (n = 7), and missense or inframe indels (n = 20, of which 11 were predicted to affect splicing). Seven variants were recurrent, including p.Leu311Trp in 10 unrelated patients, nine with generalized seizures, accounting for nine of the 11 patients in this cohort with generalized seizures. SIGNIFICANCE: PIGN encephalopathy is a complex autosomal recessive disorder associated with a wide spectrum of epilepsy phenotypes, typically with substantial profound to severe developmental impairment.
Published: 2022

11. Evidence for pathogenicity of variant ATM Val1729Leu in a family with ataxia telangiectasia

Author: Thomas W. Rösler, Manuela Pendziwiat, Mohamed Salama, Ali S. Shalash, Gregor Kuhlenbäumer, Günter U. Höglinger, Stefanie H. Müller, and Franziska Hopfner
Subjects: Male, congenital, hereditary, and neonatal diseases and abnormalities, Ataxia, Genotype, Short Communication, Mutation, Missense, Biology, medicine.disease_cause, Ataxia Telangiectasia, Cellular and Molecular Neuroscience, ddc:570, Exome Sequencing, Genetics, medicine, Humans, Point Mutation, Pathogenicity, Telangiectasia, Gene, Genetics (clinical), Immunodeficiency, Mutation, Kinase, Neurodegeneration, ATM serine/threonine kinase, genetics [alpha-Fetoproteins], medicine.disease, ddc, Pedigree, Causality, Phenotype, genetics [Ataxia Telangiectasia], Ataxia-telangiectasia, Ataxia telangiectasia, Egypt, Female, alpha-Fetoproteins, medicine.symptom
Abstract: Ataxia telangiectasia is a rare autosomal recessive multisystem disorder caused by mutations in the gene of ATM serine/threonine kinase. It is characterized by neurodegeneration, leading to severe ataxia, immunodeficiency, increased cancer susceptibility, and telangiectasia. Here, we discovered a co-segregation of two ATM gene variants with ataxia telangiectasia in an Egyptian family. While one of these variants (NM_000051.4(ATM_i001):p.(Val128*)) has previously been reported as pathogenic, the other one (NM_000051.4(ATM_i001):p.(Val1729Leu)) is regarded as a variant of uncertain significance. Our findings in this family provide additional evidence for causality of the second variant and argue that its status should be changed to pathogenic.
Published: 2021

12. Efficacy, Tolerability, and Retention of Antiseizure Medications in

Author: Jan H, Döring, Afshin, Saffari, Thomas, Bast, Knut, Brockmann, Laura, Ehrhardt, Walid, Fazeli, Wibke G, Janzarik, Annick, Klabunde-Cherwon, Gerhard, Kluger, Hiltrud, Muhle, Manuela, Pendziwiat, Rikke S, Møller, Konrad, Platzer, Joana Larupa, Santos, Julian, Schröter, Georg F, Hoffmann, Stefan, Kölker, and Steffen, Syrbe
Abstract: Pathogenic variants inA multicenter, retrospective, cross-sectional cohort study was conducted according to the Strengthening the Reporting of Observational Studies in Epidemiology criteria. Inclusion criteria were occurrence of infantile seizures and genetic diagnosis of likely pathogenic/pathogenicTreatment response data from 52 individuals withIn conclusion, a favorable effect of most ASMs, especially sodium channel blockers such as carbamezepine and OXC, was observed, whereas the efficacy and the retention rate of LEV was lower inThis study provides Class IV evidence that in individuals with
Published: 2022

13. Semantic Similarity Analysis Reveals Robust Gene-Disease Relationships in Developmental and Epileptic Encephalopathies

Author: Rhys H. Thomas, Ingo Helbig, David Lewis-Smith, Hiltrud Muhle, Lacey Smith, Colin A Ellis, Manuela Pendziwiat, Epgp Investigators, Annika Rademacher, Annapurna Poduri, Simone Seiffert, Andreas van Baalen, Sarah E McKeown, Roland Krause, Shiva Ganesan, Sarah von Spiczak, Katherine L. Helbig, Peter D. Galer, and Yvonne G. Weber
Subjects: Male, 0301 basic medicine, GABA Plasma Membrane Transport Proteins, Gene Expression, Human Phenotype Ontology, Biology, computational phenotypes, Article, Speech Disorders, EEG with generalized slow activity, Cohort Studies, 03 medical and health sciences, Munc18 Proteins, Shab Potassium Channels, 0302 clinical medicine, Semantic similarity, Similarity (network science), Seizures, Terminology as Topic, Exome Sequencing, electronic medical records, Genetics, Humans, STXBP1, whole-exome sequencing, neurogenetic disorders, Gene, Genetics (clinical), Exome sequencing, Phenotype, Semantics, NAV1.1 Voltage-Gated Sodium Channel, childhood epilepsies, developmental and epileptic encephalopathies, Gene Ontology, 030104 developmental biology, Child, Preschool, Mutation, Female, Genetics & genetic processes [F10] [Life sciences], Génétique & processus génétiques [F10] [Sciences du vivant], Spasms, Infantile, 030217 neurology & neurosurgery
Abstract: Summary More than 100 genetic etiologies have been identified in developmental and epileptic encephalopathies (DEEs), but correlating genetic findings with clinical features at scale has remained a hurdle because of a lack of frameworks for analyzing heterogenous clinical data. Here, we analyzed 31,742 Human Phenotype Ontology (HPO) terms in 846 individuals with existing whole-exome trio data and assessed associated clinical features and phenotypic relatedness by using HPO-based semantic similarity analysis for individuals with de novo variants in the same gene. Gene-specific phenotypic signatures included associations of SCN1A with “complex febrile seizures” (HP: 0011172; p = 2.1 × 10−5) and “focal clonic seizures” (HP: 0002266; p = 8.9 × 10−6), STXBP1 with “absent speech” (HP: 0001344; p = 1.3 × 10−11), and SLC6A1 with “EEG with generalized slow activity” (HP: 0010845; p = 0.018). Of 41 genes with de novo variants in two or more individuals, 11 genes showed significant phenotypic similarity, including SCN1A (n = 16, p < 0.0001), STXBP1 (n = 14, p = 0.0021), and KCNB1 (n = 6, p = 0.011). Including genetic and phenotypic data of control subjects increased phenotypic similarity for all genetic etiologies, whereas the probability of observing de novo variants decreased, emphasizing the conceptual differences between semantic similarity analysis and approaches based on the expected number of de novo events. We demonstrate that HPO-based phenotype analysis captures unique profiles for distinct genetic etiologies, reflecting the breadth of the phenotypic spectrum in genetic epilepsies. Semantic similarity can be used to generate statistical evidence for disease causation analogous to the traditional approach of primarily defining disease entities through similar clinical features.
Published: 2020

14. Early infantile epileptic encephalopathy due to biallelic pathogenic variants in <scp> PIGQ </scp> : Report of seven new subjects and review of the literature

Author: Rebecca C. Spillmann, Nissan V. Baratang, Kym M. Boycott, Karen W. Gripp, Taila Hartley, Anik St-Denis, Philippe M. Campeau, Kristin D. Kernohan, Erik A. Eklund, Jessica L. Zambonin, Loren D M Pena, Michael T. Geraghty, Andrew C. Edmondson, Jacek Majewski, Hugh J. McMillan, Allan Bayat, Miao He, Manuela Pendziwiat, Eric Bareke, Andrea Guerin, Thi Tuyet Mai Nguyen, Julie Richer, Devon L. Johnstone, and Hilde M. H. Braakman
Subjects: HYPERPHOSPHATASIA, Male, GLYCOSYLPHOSPHATIDYLINOSITOL, Disease, Immunoglobulin D, Fatal Outcome, 0302 clinical medicine, 1ST STEP, PIGQ, Child, Genetics (clinical), Exome sequencing, 0303 health sciences, biology, medicine.diagnostic_test, rare diseases, DEFECTS, Transfection, Phenotype, 3. Good health, epileptic encephalopathy, Child, Preschool, Muscle Hypotonia, Original Article, Female, medicine.symptom, Spasms, Infantile, DISORDERS, Mutation, Missense, Status epilepticus, Flow cytometry, 03 medical and health sciences, Seizures, Exome Sequencing, Genetics, medicine, Humans, BIOSYNTHESIS, Abnormalities, Multiple, IGD, Gene, 030304 developmental biology, MUTATIONS, business.industry, Infant, Newborn, Infant, Membrane Proteins, Original Articles, GENE, GPI, Immunology, biology.protein, business, exome sequencing, 030217 neurology & neurosurgery
Abstract: We investigated seven children from six families to expand the phenotypic spectrum associated with an early infantile epileptic encephalopathy caused by biallelic pathogenic variants in the phosphatidylinositol glycan anchor biosynthesis class Q (PIGQ) gene. The affected children were all identified by clinical or research exome sequencing. Clinical data, including EEGs and MRIs, was comprehensively reviewed and flow cytometry and transfection experiments were performed to investigate PIGQ function. Pathogenic biallelic PIGQ variants were associated with increased mortality. Epileptic seizures, axial hypotonia, developmental delay and multiple congenital anomalies were consistently observed. Seizure onset occurred between 2.5 months and 7 months of age and varied from treatable seizures to recurrent episodes of status epilepticus. Gastrointestinal issues were common and severe, two affected individuals had midgut volvulus requiring surgical correction. Cardiac anomalies including arrythmias were observed. Flow cytometry using granulocytes and fibroblasts from affected individuals showed reduced expression of glycosylphosphatidylinositol (GPI)‐anchored proteins. Transfection of wildtype PIGQ cDNA into patient fibroblasts rescued this phenotype. We expand the phenotypic spectrum of PIGQ‐related disease and provide the first functional evidence in human cells of defective GPI‐anchoring due to pathogenic variants in PIGQ.
Published: 2020

15. Whole‐exome and HLA sequencing in Febrile infection‐related epilepsy syndrome

Author: Rima Nabbout, Nicola Specchio, Ingo Helbig, Giulia Barcia, Michael Wittig, Peter D. Galer, Stefanie H. Mueller, Uri Kramer, Manuela Pendziwiat, Andreas van Baalen, Gregor Kuhlenbäumer, Silke Appenzeller, Zaid Afawi, Katherine L. Helbig, Shiva Ganesan, Gerhard Kluger, Priya Vaidiswaran, Julie Xian, and Psychiatry
Subjects: Male, 0301 basic medicine, Proband, Drug Resistant Epilepsy, Adolescent, Fever, Neurosciences. Biological psychiatry. Neuropsychiatry, Status epilepticus, Human leukocyte antigen, Brief Communication, Communicable Diseases, 03 medical and health sciences, Epilepsy, Status Epilepticus, 0302 clinical medicine, HLA Antigens, Exome Sequencing, medicine, Humans, RC346-429, Child, Exome, Exome sequencing, business.industry, General Neuroscience, Sequence Analysis, DNA, medicine.disease, Febrile infection related epilepsy syndrome, 030104 developmental biology, nervous system, Child, Preschool, Epilepsy syndromes, Immunology, Female, Neurology. Diseases of the nervous system, Neurology (clinical), medicine.symptom, business, Epileptic Syndromes, 030217 neurology & neurosurgery, RC321-571
Abstract: Febrile infection‐related epilepsy syndrome (FIRES) is a devastating epilepsy characterized by new‐onset refractory status epilepticus with a prior febrile infection. We performed exome sequencing in 50 individuals with FIRES, including 27 patient–parent trios and 23 single probands, none of whom had pathogenic variants in established genes for epilepsies or neurodevelopmental disorders. We also performed HLA sequencing in 29 individuals with FIRES and 529 controls, which failed to identify prominent HLA alleles. The genetic architecture of FIRES is substantially different from other developmental and epileptic encephalopathies, and the underlying etiology remains elusive, requiring novel approaches to identify the underlying causative factors.
Published: 2020

16. Lessons learned from 40 novel PIGA patients and a review of the literature

Author: Martin R. Larsen, Shiva Ganesan, Tobias Brünger, Nicolas Chassaing, Caroline Nava, Renzo Guerrini, Kim L. McBride, Anneke Kievit, Elena Parrini, Dennis Lal, Lisbeth Tranebjærg, Christel Depienne, Aleksandra Jezela-Stanek, Matthew Pastore, Carolina Fischinger Moura de Souza, Berten Ceulemans, Hannah Moore, Peter Krawitz, Gaetan Lesca, Ingo Helbig, Valerie Layet, Friedrich Bosch, Alexandra Afenjar, Rikke S. Møller, Carlos Ferreira, Sophie Naudion, Milda Endziniene, Alexej Knaus, Lilian Bomme Ousager, Marie-Christine Nougues, Caroline Karsenty, Johanne Kragh Hansen, Allan Bayat, Elena Gardella, Anne-Marie Guerrot, Marije Meuwissen, Tahsin Stefan Barakat, Mads Thomassen, Patrick Calvas, F Kooy, Jurgen H Schelhaas, Svetlana Gataullina, Lynne A. Wolfe, Bert Callewaert, Ashley Thomas, Steven A. Skinner, Lars Hansen, Manuela Pendziwiat, Cécile Freihuber, Cyril Mignot, Krzysztoł Szczałuba, Marjon van Slegtenhorst, Martino Montomoli, Christian Korff, and Clinical Genetics
Subjects: Adult, Male, 0301 basic medicine, Fryns syndrome phenotype, bioinformatical comparison, Medizin, Limb Deformities, Congenital, Cardiomyopathy, genotype-phenotype correlation, Biology, Cohort Studies, 03 medical and health sciences, 0302 clinical medicine, Germline mutation, medicine, Humans, Clinical significance, mild developmental delay, Amino Acid Sequence, Global developmental delay, Child, Hernia, Diaphragmatic, Genetics, Infant, Newborn, Facies, Genetic Variation, Membrane Proteins, Electroencephalography, PIGA, medicine.disease, Magnetic Resonance Imaging, Phenotype, Hypotonia, 030104 developmental biology, Neurology, Cohort, Neurology (clinical), Human medicine, medicine.symptom, Congenital disorder of glycosylation, 030217 neurology & neurosurgery
Abstract: OBJECTIVE: To define the phenotypic spectrum of phosphatidylinositol glycan class A protein (PIGA)-related congenital disorder of glycosylation (PIGA-CDG) and evaluate genotype-phenotype correlations.METHODS: Our cohort encompasses 40 affected males with a pathogenic PIGA variant. We performed a detailed phenotypic assessment, and in addition, we reviewed the available clinical data of 36 previously published cases and assessed the variant pathogenicity using bioinformatical approaches.RESULTS: Most individuals had hypotonia, moderate to profound global developmental delay, and intractable seizures. We found that PIGA-CDG spans from a pure neurological phenotype at the mild end to a Fryns syndrome-like phenotype. We found a high frequency of cardiac anomalies including structural anomalies and cardiomyopathy, and a high frequency of spontaneous death, especially in childhood. Comparative bioinformatical analysis of common variants, found in the healthy population, and pathogenic variants, identified in affected individuals, revealed a profound physiochemical dissimilarity of the substituted amino acids in variant constrained regions of the protein.SIGNIFICANCE: Our comprehensive analysis of the largest cohort of published and novel PIGA patients broadens the spectrum of PIGA-CDG. Our genotype-phenotype correlation facilitates the estimation on pathogenicity of variants with unknown clinical significance and prognosis for individuals with pathogenic variants in PIGA.
Published: 2020

17. Spectrum of Phenotypic, Genetic, and Functional Characteristics in Epilepsy Patients With KCNC2 Pathogenic Variants

Author: Niklas, Schwarz, Simone, Seiffert, Msc, Manuela, Pendziwiat, Annika Verena Rademacher, Tobias, Br¨unger, Phd, Hedrich, Ulrike B. S., Augustijn, Paul B., Hartmut, Baier, Allan, Bayat, Francesca, Bisulli, Phd, Md, Buono, Russell J., Ben Zeev Bruria, Doyle, Michael G., Guerrini, Renzo, Gali, Heimer, Iacomino, Michele, Hugh, Kearney, Karl Martin Klein, Ioanna, Kousiappa, Kunz, Wolfram S., Holger, Lerche, Laura, Licchetta, Ebba, Lohmann, Raffaella, Minardi, Marie, Mcdonald, Sarah, Montgomery, Lejla, Mulahasanovic, Renske, Oegema, Barel, Ortal, Papacostas, Savvas S., Francesca, Ragona, Tiziana, Granata, Reif, Phillip S., Felix, Rosenow, Annick, Rothschild, Scudieri, Paolo, Striano, Pasquale, Paolo, Tinuper, Tanteles, George A., Annalisa, Vetro, Felix, Zahnert, Goldberg, Ethan M., Zara, Federico, Dennis, Lal, Patrick, May, Hiltrud, Muhle, Ingo, Helbig, and and Yvonne Weber
Subjects: Neurology (clinical)
Abstract: Background:KCNC2 encodes Kv3.2, a member of the Shaw-related (Kv3) voltage-gated potassium channel subfamily, which is important for sustained high-frequency firing and optimized energy efficiency of action potentials in the brain. The objective of this study was to analyse the clinical phenotype, genetic background, and biophysical function of disease-associated Kv3.2 variants.Methods:Individuals with KCNC2 variants detected by exome sequencing were selected for clinical, further genetic, and functional analysis. Cases were referred through clinical and research collaborations. Selected de novo variants were examined electrophysiologically in Xenopus laevis oocytes.Results:We identified novel KCNC2 variants in 18 patients with various forms of epilepsy including genetic generalized epilepsy (GGE), developmental and epileptic encephalopathy (DEE) including early-onset absence epilepsy (EOAE), focal epilepsy (FE), and myoclonic-atonic epilepsy (MAE). 10/18 variants were de novo and 8/18 variants were classified as modifying variants. 8 drug responsive cases became seizure-free using valproic acid as monotherapy or in combination including severe DEE cases. Functional analysis of four variants demonstrated gain-of-function in three severely affected DEE cases and loss-of-function in one case with a milder phenotype (GGE) as the underlying pathomechanisms.Conclusion:These findings implicate KCNC2 as a novel causative gene for epilepsy and emphasize the critical role of KV3.2 in the regulation of brain excitability.
Published: 2022

18. Modulating effects of FGF12 variants on Na

Author: Simone, Seiffert, Manuela, Pendziwiat, Tatjana, Bierhals, Himanshu, Goel, Niklas, Schwarz, Amelie, van der Ven, Christian Malte, Boßelmann, Johannes, Lemke, Steffen, Syrbe, Marjolein Hanna, Willemsen, Ulrike Barbara Stefanie, Hedrich, Ingo, Helbig, and Yvonne, Weber
Subjects: Fibroblast Growth Factors, Brain Diseases, NAV1.2 Voltage-Gated Sodium Channel, Autism Spectrum Disorder, NAV1.6 Voltage-Gated Sodium Channel, Humans, Sodium Channels, Sodium Channel Blockers
Abstract: Fibroblast Growth Factor 12 (FGF12) may represent an important modulator of neuronal network activity and has been associated with developmental and epileptic encephalopathy (DEE). We sought to identify the underlying pathomechanism of FGF12-related disorders.Patients with pathogenic variants in FGF12 were identified through published case reports, GeneMatcher and whole exome sequencing of own case collections. The functional consequences of two missense and two copy number variants (CNVs) were studied by co-expression of wildtype and mutant FGF12 in neuronal-like cells (ND7/23) with the sodium channels NaFour variants in FGF12 were identified for functional analysis: one novel FGF12 variant in a patient with autism spectrum disorder and three variants from previously published patients affected by DEE. We demonstrate the differential regulating effects of wildtype and mutant FGF12 on NaWe could demonstrate the detailed regulating effect of FGF12 on NaDFG, BMBF, Hartwell Foundation, National Institute for Neurological Disorders and Stroke, IDDRC, ENGIN, NIH, ITMAT, ILAE, RES and GRIN.
Published: 2021

19. Modulating effects of FGF12 variants on NaV1.2 and NaV1.6 associated with Developmental and Epileptic Encephalopathy and Autism Spectrum Disorder

Author: Simone Seiffert, Manuela Pendziwiat, Tatjana Bierhals, Himanshu Goel, Niklas Schwarz, Amelie van der Ven, Christian Malte Boßelmann, Marjolein H. Willemsen, Ulrike B.S. Hedrich, Ingo Helbig, and Yvonne G. Weber
Abstract: ObjectiveFibroblast growth factor 12 (FGF12) may represent an important modulator of neuronal network activity and has been associated with developmental and epileptic encephalopathy (DEE). We sought to identify the underlying pathomechanism of FGF12-related disorders.MethodsPatients with pathogenic variants in FGF12 were identified through published case reports, GeneMatcher and whole exome sequencing of own case collections. The functional consequences of two missense variants and two copy number variants (CNVs) were studied by co-expression of wild-type and mutant FGF12 in neuronal-like cells (ND7/23) with the sodium channels NaV1.2 or NaV1.6, including their functional active beta-1 and beta-2 sodium channel subunits (SCN1B and SCN2B).ResultsFour variants in FGF12 were identified for functional analysis: one novel FGF12 variant in a patient with autism spectrum disorder and three variants from previously published patients affected by developmental and epileptic encephalopathy (DEE). We demonstrate the differential regulating effects of wildtype and mutant FGF12 on NaV1.2 and NaV1.6 channels. Here, FGF12 variants lead to a complex kinetic influence on Nav1.2 and Nav 1.6, including loss- as well as gain-of function changes in fast inactivation as well as loss-of function changes in slow inactivation.InterpretationFor the first time, we could demonstrate the detailed regulating effect of FGF12 on NaV1.2 and NaV1.6 and confirmed the complex effect of FGF12 on neuronal network activity. Our findings expand the phenotypic spectrum related to FGF12 variants and elucidate the underlying pathomechanism. Specific variants in FGF12-associated disorders may be amenable to precision treatment with sodium channel blockers.
Published: 2021

20. Bi-allelic variants in OGDHL cause a neurodevelopmental spectrum disease featuring epilepsy, hearing loss, visual impairment, and ataxia

Author: Yvonne G. Weber, Mujaddad Ur Rehman, Massimo Zeviani, Srinitya Gannavarapu, Sirous Zeinali, Sanmati Cuddapah, Zheng Yie Yap, Sukyeong Lee, Javeria Raza Alvi, Adi Reich, Wan Hee Yoon, Isabelle Schrauwen, Tahsin Stefan Barakat, Pasquale Striano, Andrea Legati, Ingo Helbig, Sarah von Spiczak, Vincenzo Salpietro, Henry Houlden, Kolsoum Saeidi, Cholsoon Jang, Mohammad-Sadegh Fallah, Alessia Nasca, Abigail Sandoval, Elham Davoudi-Dehaghani, Karen Vargas Parra, Kshitij Mankad, Stephanie Efthymiou, Anja Wagner, Sunhee Jung, Suzanne M. Leal, Manuela Pendziwiat, Bibi Nazia Murtaza, Daniele Ghezzi, Muhammad Nadeem, Elizabeth J. Bhoj, Costanza Lamperti, Reza Maroofian, Simone Seiffert, Barbara Vona, and Clinical Genetics
Subjects: Male, Microcephaly, DNA Mutational Analysis, Compound heterozygosity, Cohort Studies, Exon, Missense mutation, Child, Cells, Cultured, Genetics (clinical), Exome sequencing, Genetics, CRISPR-Cas9 gene editing, Cultured, mitochondria, Drosophila melanogaster, Drosophila, Female, medicine.symptom, Ataxia, Cells, RNA Splicing, Vision Disorders, Biology, bi-allelic, Article, Frameshift mutation, SDG 3 - Good Health and Well-being, medicine, Animals, Humans, Ketoglutarate Dehydrogenase Complex, Allele, developmental and epileptic encephalopathy, Hearing Loss, Alleles, DEE, Family Health, Epilepsy, Fibroblasts, medicine.disease, OGDHL, neurodevelopmental disease, α-ketoglutarate, exome sequencing, Neurodevelopmental Disorders, Mutation
Abstract: The 2-oxoglutarate dehydrogenase-like (OGDHL) protein is a rate-limiting enzyme in the Krebs cycle that plays a pivotal role in mitochondrial metabolism. OGDHL expression is restricted mainly to the brain in humans. Here, we report nine individuals from eight unrelated families carrying bi-allelic variants in OGDHL with a range of neurological and neurodevelopmental phenotypes including epilepsy, hearing loss, visual impairment, gait ataxia, microcephaly, and hypoplastic corpus callosum. The variants include three homozygous missense variants (p.Pro852Ala, p.Arg244Trp, and p.Arg299Gly), three compound heterozygous single-nucleotide variants (p.Arg673Gln/p.Val488Val, p.Phe734Ser/p.Ala327Val, and p.Trp220Cys/p.Asp491Val), one homozygous frameshift variant (p.Cys553Leufs∗16), and one homozygous stop-gain variant (p.Arg440Ter). To support the pathogenicity of the variants, we developed a novel CRISPR-Cas9-mediated tissue-specific knockout with cDNA rescue system for dOgdh, the Drosophila ortholog of human OGDHL. Pan-neuronal knockout of dOgdh led to developmental lethality as well as defects in Krebs cycle metabolism, which was fully rescued by expression of wild-type dOgdh. Studies using the Drosophila system indicate that p.Arg673Gln, p.Phe734Ser, and p.Arg299Gly are severe loss-of-function alleles, leading to developmental lethality, whereas p.Pro852Ala, p.Ala327Val, p.Trp220Cys, p.Asp491Val, and p.Arg244Trp are hypomorphic alleles, causing behavioral defects. Transcript analysis from fibroblasts obtained from the individual carrying the synonymous variant (c.1464T>C [p.Val488Val]) in family 2 showed that the synonymous variant affects splicing of exon 11 in OGDHL. Human neuronal cells with OGDHL knockout exhibited defects in mitochondrial respiration, indicating the essential role of OGDHL in mitochondrial metabolism in humans. Together, our data establish that the bi-allelic variants in OGDHL are pathogenic, leading to a Mendelian neurodevelopmental disease in humans.
Published: 2021

21. Genome-wide association study of autopsy-confirmed Multiple System Atrophy identifies common variants near ZIC1 and ZIC4

Author: Manuela Pendziwiat, Margaret E. Flanagan, Marla Gearing, Catriona McLean, Regina Reimann, Günter U. Höglinger, Günther Deuschl, Alan J. Thomas, David Ellinghaus, María José Martí, Allison Beller, Johannes Levin, Ian R. A. Mackenzie, Viktoria Ruf, John Q. Trojanowski, Jonathan D. Glass, Brit Mollenhauer, Franziska Hopfner, Justo Yebenes, Adriano Aguzzi, Lea T. Grinberg, Claire Troakes, Glenda M. Halliday, William K. Scott, Johannes Attems, Charles L. White, Ali H. Rajput, Kathy L. Newell, Owen A. Ross, Ulrich Müller, Charles Duyckaerts, Paula Desplats, Tao Xie, David J. Irwin, Inge Huitinga, Gerard D. Schellenberg, Valentin Evsyukov, Sashika Selvackadunco, Bernardino Ghetti, Per Svenningsson, Ian G. McKeith, Alex Rajput, Manuela Neumann, Ingo Helbig, Edward B. Lee, Ellen Gelpi, Jochen Herms, Tanya Simuni, Matthias Höllerhage, Matthew P. Frosch, Gregor Kuhlenbäumer, Andre Franke, Thomas G. Beach, Annette Peters, Dennis W. Dickson, Shunsuke Koga, Laura Molina Porcel, Vivianna M. Van Deerlin, Dirk C. Keene, Anja K. Tietz, Christine Stadelmann, Claudia Trenkwalder, Teresa Ximelis, William W. Seeley, Radoslav Matěj, Alexander Pantelyat, Alberto Rabano, and Gabor G. Kovacs
Subjects: 0303 health sciences, Pathology, medicine.medical_specialty, Cerebellum, Cerebellar ataxia, business.industry, Striatonigral Degeneration, Genome-wide association study, medicine.disease, 3. Good health, 03 medical and health sciences, 0302 clinical medicine, Olivopontocerebellar atrophy, Dentate nucleus, medicine.anatomical_structure, Atrophy, Chromosome 3, medicine, medicine.symptom, business, 030217 neurology & neurosurgery, 030304 developmental biology
Abstract: Multiple System Atrophy is a rare neurodegenerative disease with alpha-synuclein aggregation in glial cytoplasmic inclusions and either predominant olivopontocerebellar atrophy or striatonigral degeneration, leading to dysautonomia, parkinsonism, and cerebellar ataxia. One prior genome-wide association study in mainly clinically diagnosed patients with Multiple System Atrophy failed to identify genetic variants predisposing for the disease. Since the clinical diagnosis of Multiple System Atrophy yields a high rate of misdiagnosis when compared to the neuropathological gold standard, we studied common genetic variation in only autopsy-confirmed cases (N = 731) and controls (N = 2,898).The most strongly disease-associated markers were rs16859966 on chromosome 3 (P = 8.6 × 10−7, odds ratio (OR) = 1.58, [95% confidence interval (CI) = 1.32-1.89]), rs7013955 on chromosome 8 (P = 3.7 × 10−6, OR = 1.8 [1.40-2.31]), and rs116607983 on chromosome 4 (P = 4.0 × 10−6, OR = 2.93 [1.86-4.63]), all of which were supported by at least one additional genotyped and several imputed single nucleotide polymorphisms with P-values below 5 × 10−5. The genes closest to the chromosome 3 locus are ZIC1 and ZIC4 encoding the zinc finger proteins of cerebellum 1 and 4 (ZIC1 and ZIC4).Since mutations of ZIC1 and ZIC4 and paraneoplastic autoantibodies directed against ZIC4 are associated with severe cerebellar dysfunction, we conducted immunohistochemical analyses in brain tissue of the frontal cortex and the cerebellum from 24 Multiple System Atrophy patients. Strong immunohistochemical expression of ZIC4 was detected in a subset of neurons of the dentate nucleus in all healthy controls and in patients with striatonigral degeneration, whereas ZIC4 positive neurons were significantly reduced in patients with olivopontocerebellar atrophy.These findings point to a potential ZIC4-mediated vulnerability of neurons in Multiple System Atrophy.
Published: 2021

22. A Recurrent Missense Variant in AP2M1 Impairs Clathrin-Mediated Endocytosis and Causes Developmental and Epileptic Encephalopathy

Author: Batsal Devkota, José M. Serratosa, Joel N. Hirschhorn, Renzo Guerrini, Patrick May, Johanna A. Jähn, Paul Avillach, Yvonne G. Weber, Sha Tang, Kaja Kristine Selmer, Joseph J. Shen, Annika Rademacher, Joseph Peeden, Ulrich Stephani, Judson Kilbourn, Niklas Schwarz, Deb K. Pal, Lacey Smith, Trine Bjørg Hammer, Carla Marini, Deanne Taylor, Ingo Helbig, Rudi Balling, Arvid Suls, Holger Lerche, Karl Martin Klein, Simone Seiffert, Annapurna Poduri, Bobby P. C. Koeleman, Tania López-Hernández, Deepali N. Shinde, Stéphanie Baulac, Sawona Biswas, Eric LeGuern, Peter D. Galer, Volker Haucke, Katherine L. Helbig, Ian D. Krantz, Aarno Palotie, Sarah Weckhuysen, Nadja Hümpfer, Tiina Talvik, Rikke S. Møller, Roland Krause, Allison Heath, Dorota Hoffman-Zacharska, Nina Barišić, Peter De Jonghe, Hiltrud Muhle, In-Hee Lee, Kenneth D. Mandl, Felix Benninger, Dana Craiu, Florence T. Bourgeois, Colin A Ellis, Sanjay M. Sisodiya, Christel Depienne, Barbara Hallinan, Eric D. Marsh, Susanne Schubert-Bast, Manuela Pendziwiat, Kristen L. Sund, Federico Zara, Tracy A. Glauser, Katalin Štěrbová, Johannes R. Lemke, Oded Shor, Anna-Elina Lehesjoki, Helle Hjalgrim, Anna Bartels, Vladimir Komarek, Peter White, Tarja Linnankivi, Hande Caglayan, Sarah von Spiczak, Shiva Ganesan, Felix Rosenow, Sek Won Kong, Pasquale Striano, EuroEPINOMICS-RES Consortium, GRIN Consortium, Department of Medical and Clinical Genetics, Centre of Excellence in Complex Disease Genetics, Aarno Palotie / Principal Investigator, Genomics of Neurological and Neuropsychiatric Disorders, Institute for Molecular Medicine Finland, HUS Children and Adolescents, and Children's Hospital
Subjects: 0301 basic medicine, PROTEIN, ILAE COMMISSION, clathrin-mediated endocytosis, 3124 Neurology and psychiatry, Mice, Epilepsy, 0302 clinical medicine, BINDING, Conditional gene knockout, Missense mutation, Child, Genetics (clinical), Mice, Knockout, Genetics, Brain Diseases, neurodevelopmental disorders, Phenotype, Endocytosis, Adaptor Protein Complex mu Subunits, Child, Preschool, Female, POSITION PAPER, RECRUITMENT, Adolescent, computational phenotypes, developmental and epileptic encephalopathy, Human Phenotype Ontology, synaptic transmission, Adaptor Protein Complex 2, Mutation, Missense, Biology, CLASSIFICATION, Article, 03 medical and health sciences, Exome Sequencing, medicine, Animals, Humans, Synaptic vesicle recycling, ADAPTER AP-2, Generalized epilepsy, 3112 Neurosciences, Infant, Receptor-mediated endocytosis, medicine.disease, Clathrin, 030104 developmental biology, DE-NOVO MUTATIONS, 3111 Biomedicine, Human medicine, 030217 neurology & neurosurgery
Abstract: The developmental and epileptic encephalopathies (DEEs) are heterogeneous disorders with a strong genetic contribution, but the underlying genetic etiology remains unknown in a significant proportion of individuals. To explore whether statistical support for genetic etiologies can be generated on the basis of phenotypic features, we analyzed whole-exome sequencing data and phenotypic similarities by using Human Phenotype Ontology (HPO) in 314 individuals with DEEs. We identified a de novo c.508C>T (p.Arg170Trp) variant in AP2M1 in two individuals with a phenotypic similarity that was higher than expected by chance (p = 0.003) and a phenotype related to epilepsy with myoclonic-atonic seizures. We subsequently found the same de novo variant in two individuals with neurodevelopmental disorders and generalized epilepsy in a cohort of 2,310 individuals who underwent diagnostic whole-exome sequencing. AP2M1 encodes the mu-subunit of the adaptor protein complex 2 (AP-2), which is involved in clathrin-mediated endocytosis (CME) and synaptic vesicle recycling. Modeling of protein dynamics indicated that the p.Arg170Trp variant impairs the conformational activation and thermodynamic entropy of the AP-2 complex. Functional complementation of both the mu-subunit carrying the p.Arg170Trp variant in human cells and astrocytes derived from AP-2 mu conditional knockout mice revealed a significant impairment of CME of transferrin. In contrast, stability, expression levels, membrane recruitment, and localization were not impaired, suggesting a functional alteration of the AP-2 complex as the underlying disease mechanism. We establish a recurrent pathogenic variant in AP2M1 as a cause of DEEs with distinct phenotypic features, and we implicate dysfunction of the early steps of endocytosis as a disease mechanism in epilepsy.
Published: 2019

23. Spectrum of Phenotypic, Genetic, and Functional Characteristics in Patients With Epilepsy With

Author: Niklas, Schwarz, Simone, Seiffert, Manuela, Pendziwiat, Annika Verena, Rademacher, Tobias, Brünger, Ulrike B S, Hedrich, Paul B, Augustijn, Hartmut, Baier, Allan, Bayat, Francesca, Bisulli, Russell J, Buono, Ben Zeev, Bruria, Michael G, Doyle, Renzo, Guerrini, Gali, Heimer, Michele, Iacomino, Hugh, Kearney, Karl Martin, Klein, Ioanna, Kousiappa, Wolfram S, Kunz, Holger, Lerche, Laura, Licchetta, Ebba, Lohmann, Raffaella, Minardi, Marie, McDonald, Sarah, Montgomery, Lejla, Mulahasanovic, Renske, Oegema, Barel, Ortal, Savvas S, Papacostas, Francesca, Ragona, Tiziana, Granata, Phillip S, Reif, Felix, Rosenow, Annick, Rothschild, Paolo, Scudieri, Pasquale, Striano, Paolo, Tinuper, George A, Tanteles, Annalisa, Vetro, Felix, Zahnert, Ethan M, Goldberg, Federico, Zara, Dennis, Lal, Patrick, May, Hiltrud, Muhle, Ingo, Helbig, and Yvonne, Weber
Subjects: Epilepsy, Phenotype, Shaw Potassium Channels, Seizures, Exome Sequencing, Humans, Epilepsy, Generalized
Abstract: Individuals withWe identified novelThese findings implicate
Published: 2021

24. Heterozygous variants in KCNC2 cause a broad spectrum of epilepsy phenotypes associated with characteristic functional alterations

Author: Manuela Pendziwiat, Renske Oegema, Ioanna Kousiappa, Yvonne G. Weber, Francesca Ragona, Dennis Lal, Ulrike B. S. Hedrich, Mulahasanovic L, Gali Heimer, Kearney H, Hiltrud Muhle, Pasquale Striano, Paolo Scudieri, Annika Rademacher, Rothschild A, Michele Iacomino, Lohmann E, Augustijn Pb, Russell J. Buono, Holger Lerche, Philipp S. Reif, George A. Tanteles, Karl Martin Klein, Bayat A, Francesca Bisulli, Wolfram S. Kunz, Montgomery S, Bruria Bz, Papacostas Ss, Renzo Guerrini, Laura Licchetta, Ingo Helbig, Bruenger T, Federico Zara, Zahnert F, Marie T. McDonald, Hartmut Baier, Patrick May, Niklas Schwarz, Doyle Mg, Simone Seiffert, Vetro A, Paolo Tinuper, Ortal B, Tiziana Granata, Felix Rosenow, and Raffaella Minardi
Subjects: Genetics, Valproic Acid, Broad spectrum, Epilepsy, biology, Xenopus, medicine, Causative gene, biology.organism_classification, medicine.disease, Phenotype, Exome sequencing, medicine.drug
Abstract: BackgroundKCNC2 encodes a member of the shaw-related voltage-gated potassium channel family (KV3.2), which are important for sustained high-frequency firing and optimized energy efficiency of action potentials in the brain.MethodsIndividuals with KCNC2 variants detected by exome sequencing were selected for clinical, further genetic and functional analysis. The cases were referred through clinical and research collaborations in our study. Four de novo variants were examined electrophysiologically in Xenopus laevis oocytes.ResultsWe identified novel KCNC2 variants in 27 patients with various forms of epilepsy. Functional analysis demonstrated gain-of-function in severe and loss-of-function in milder phenotypes as the underlying pathomechanisms with specific response to valproic acid.ConclusionThese findings implicate KCNC2 as a novel causative gene for epilepsy emphasizing the critical role of KV3.2 in the regulation of brain excitability with an interesting genotype-phenotype correlation and a potential concept for precision medicine.
Published: 2021

25. Agammaglobulinemia with normal B-cell numbers in a patient lacking Bob1

Author: Els Verhoeyen, Matthias Eckenweiler, Johannes Jung, Manuela Pendziwiat, Stephan Ehl, Julian Staniek, Irakli Rtskhiladze, Oliver Wegehaupt, Natia Japaridze, Patrick Kury, Andrés Caballero Garcia de Oteyza, Marta Rizzi, Carsten Speckmann, Michele Proietti, Iga Janowska, Ingo Helbig, Rudolf Korinthenberg, Tamar Phirtskhalaishvili, and Peter J. Nielsen
Subjects: 0301 basic medicine, biology, business.industry, Immunology, B-cell receptor, education, medicine.disease, Immunoglobulin secretion, Normal B cell numbers, humanities, 03 medical and health sciences, 030104 developmental biology, 0302 clinical medicine, biology.protein, Immunology and Allergy, Medicine, Respiratory system, Antibody, business, 030217 neurology & neurosurgery, Immunodeficiency, health care economics and organizations
Abstract: Journal of Allergy and Clinical Immunology, 147 (5), ISSN:0091-6749, ISSN:1097-6825
Published: 2021

26. Genotype-phenotype correlations in SCN8A-related disorders reveal prognostic and therapeutic implications

Author: Arve Vøllo, Stephen W. Scherer, Elena Gardella, Irina Mishina, María Vaccarezza, Jennifer L. Howe, Sebastian Lebon, Josua Kegele, Gaetan Lesca, Timo Roser, Silvia Masnada, Johannes Rebstock, Marga Buzatu, Damien Lederer, Ingo Borggraefe, Tobias Brünger, Ulrike B. S. Hedrich, Sergey Korostelev, Frédéric Bilan, Ahmed Eltokhi, M. Mahdi Motazacker, Karen E. Wain, Susanne Ruf, Manuela Pendziwiat, Lukas Sonnenberg, Yuanyuan Liu, Alice W Ho, Silvana Franceschetti, Jan Benda, Ethan M. Goldberg, Helene Verhelst, Julian Schubert, Juliann M. Savatt, Mathilde Nizon, Caroline Lund, Katherine B. Howell, Tobias Loddenkemper, Katherine L. Helbig, Cornelia Betzler, Roseline Caume, Francesca Darra, Richard J. Leventer, Christina Fenger, Pierangelo Veggiotti, Ilona Krey, Nancy Eisenhauer, Andrea Berger, Pasquale Striano, Heather E. Olson, An-Sofie Schoonjans, M Scott Perry, Stephan Lauxmann, Emmanuel Scalais, Petra Laššuthová, Monisa D. Wagner, Ilya V. Kanivets, A. A. Sharkov, P Y Billie Au, Mahmoud Koko, Siddharth Srivastava, Jakob Christensen, Artem Borovikov, Mette U Schmidt-Petersen, Anna Jansen, Judith S. Verhoeven, Johanna Krüger, Claudia M Bonardi, Shoji Ichikawa, Patrick May, Sabine Grønborg, Johannes R. Lemke, Marije Meuwissen, Katalin Sterbova, Mark Fitzgerald, Lucio Giordano, Holger Lerche, Mikhail Abramov, Bénédicte Gérard, Elena L. Dadali, Cecilia Altuzarra, Aster V. E. Harder, Stefano Sartori, Katrine M Johannesen, Sergey Kutsev, Maert Rannap, Renzo Guerrini, Dagmar Wieczorek, Laura Canafoglia, Annapurna Poduri, Christina E. Hoei-Hansen, Agathe Roubertie, Nils A Koch, Karen Müller-Schlüter, Chloe A Stutterd, Ngoc Minh Le, Pia Zacher, Constanze Heine, Sonja Walsh, Carla Marini, Federico Zara, Karl Martin Klein, Eva H. Brilstra, Guido Rubboli, Walid Fazeli, Judith Kroell-Seger, Rikke S. Møller, Dorota Hoffman-Zacharska, Michael Alber, Phillis Lakeman, Massimo Mastrangelo, Margarete Koch-Hogrebe, Ingo Helbig, Daniel Tibussek, Marketa Vlckova, Anne Destrée, Wen-Hann Tan, Haim Bassan, Dennis Lal, Patrizia Accorsi, Bert van der Zwaag, Cathrine E Gjerulfsen, Marion Gérard, Sara Matricardi, Thomas U. Mayer, Philippe Gelisse, Jong M. Rho, and Marie-Cécile Nassogne
Subjects: medicine.medical_specialty, Benign familial infantile epilepsy, business.industry, medicine.disease, Gastroenterology, Phenotype, Epilepsy, Electrophysiology, Sodium channel blocker, Internal medicine, medicine, Missense mutation, Generalized epilepsy, business, Genotype-Phenotype Correlations
Abstract: We report detailed functional analyses and genotype-phenotype correlations in 433 individuals carrying disease-causing variants in SCN8A, encoding the voltage-gated Na+ channel NaV1.6. Five different clinical subgroups could be identified: 1) Benign familial infantile epilepsy (BFIE) (n=17, normal cognition, treatable seizures), 2) intermediate epilepsy (n=36, mild ID, partially pharmacoresponsive), 3) developmental and epileptic encephalopathy (DEE, n=191, severe ID, majority pharmacoresistant), 4) generalized epilepsy (n=21, mild to moderate ID, frequently with absence seizures), and 5) affected individuals without epilepsy (n=25, mild to moderate ID). Groups 1-3 presented with early-onset (median: four months) focal or multifocal seizures and epileptic discharges, whereas the onset of seizures in group 4 was later (median: 39 months) with generalized epileptic discharges. The epilepsy was not classifiable in 143 individuals. We performed functional studies expressing missense variants in ND7/23 neuroblastoma cells and primary neuronal cultures using recombinant tetrodotoxin insensitive human NaV1.6 channels and whole-cell patch clamping. Two variants causing DEE showed a strong gain-of-function (GOF, hyperpolarising shift of steady-state activation, strongly increased neuronal firing rate), and one variant causing BFIE or intermediate epilepsy showed a mild GOF (defective fast inactivation, less increased firing). In contrast, all three variants causing generalized epilepsy induced a loss-of-function (LOF, reduced current amplitudes, depolarising shift of steady-state activation, reduced neuronal firing). Including previous studies, functional effects were known for 165 individuals. All 133 individuals carrying GOF variants had either focal (76, groups 1-3), or unclassifiable epilepsy (37), whereas 32 with LOF variants had either generalized (14), no (11) or unclassifiable (5) epilepsy; only two had DEE. Computational modeling in the GOF group revealed a significant correlation between the severity of the electrophysiological and clinical phenotypes. GOF variant carriers responded significantly better to sodium channel blockers (SCBs) than to other anti-seizure medications, and the same applied for all individuals of groups 1-3.In conclusion, our data reveal clear genotype-phenotype correlations between age at seizure onset, type of epilepsy and gain- or loss-of-function effects of SCN8A variants. Generalized epilepsy with absence seizures is the main epilepsy phenotype of LOF variant carriers and the extent of the electrophysiological dysfunction of the GOF variants is a main determinant of the severity of the clinical phenotype in focal epilepsies. Our pharmacological data indicate that SCBs present a therapeutic treatment option in early onset SCN8A-related focal epilepsy.
Published: 2021

27. Distinct gene-set burden patterns underlie common generalized and focal epilepsies

Author: Mahmoud Koko, Roland Krause, Thomas Sander, Dheeraj Reddy Bobbili, Michael Nothnagel, Patrick May, Holger Lerche, Yen-Chen Anne Feng, Daniel P Howrigan, Liam E Abbott, Katherine Tashman, Felecia Cerrato, Tarjinder Singh, Henrike Heyne, Andrea Byrnes, Claire Churchhouse, Nick Watts, Matthew Solomonson, Dennis Lal, Erin L Heinzen, Ryan S Dhindsa, Kate E Stanley, Gianpiero L Cavalleri, Hakon Hakonarson, Ingo Helbig, Sarah Weckhuysen, Slavé Petrovski, Sitharthan Kamalakaran, Sanjay M Sisodiya, Patrick Cossette, Chris Cotsapas, Peter DeJonghe, Tracy Dixon-Salazar, Renzo Guerrini, Patrick Kwan, Anthony G Marson, Randy Stewart, Chantal Depondt, Dennis J Dlugos, Ingrid E Scheffer, Pasquale Striano, Catharine Freyer, Kevin McKenna, Brigid M Regan, Susannah T Bellows, Costin Leu, Caitlin A Bennett, Esther M C Johns, Alexandra Macdonald, Hannah Shilling, Rosemary Burgess, Dorien Weckhuysen, Melanie Bahlo, Terence J O'Brien, Marian Todaro, Hannah Stamberger, Danielle M Andrade, Tara R Sadoway, Kelly Mo, Heinz Krestel, Sabina Gallati, Savvas S Papacostas, Ioanna Kousiappa, George A Tanteles, Katalin Štěrbová, Markéta Vlčková, Lucie Sedláčková, Petra Laššuthová, Karl Martin Klein, Felix Rosenow, Philipp S Reif, Susanne Knake, Wolfram S Kunz, Gábor Zsurka, Christian E Elger, Jürgen Bauer, Michael Rademacher, Manuela Pendziwiat, Hiltrud Muhle, Annika Rademacher, Andreas vanBaalen, Sarah vonSpiczak, Ulrich Stephani, Zaid Afawi, Amos D Korczyn, Moien Kanaan, Christina Canavati, Gerhard Kurlemann, Karen Müller-Schlüter, Gerhard Kluger, Martin Häusler, Ilan Blatt, Johannes R Lemke, Ilona Krey, Yvonne G Weber, Stefan Wolking, Felicitas Becker, Christian Hengsbach, Sarah Rau, Ana F Maisch, Bernhard J Steinhoff, Andreas Schulze-Bonhage, Susanne Schubert-Bast, Herbert Schreiber, Ingo Borggräfe, Christoph J Schankin, Thomas Mayer, Rudolf Korinthenberg, Knut Brockmann, Dieter Dennig, Rene Madeleyn, Reetta Kälviäinen, Pia Auvinen, Anni Saarela, Tarja Linnankivi, Anna-Elina Lehesjoki, Mark I Rees, Seo-Kyung Chung, William O Pickrell, Robert Powell, Natascha Schneider, Simona Balestrini, Sara Zagaglia, Vera Braatz, Michael R Johnson, Pauls Auce, Graeme J Sills, Larry W Baum, Pak C Sham, Stacey S Cherny, Colin H T Lui, Nina Barišić, Norman Delanty, Colin P Doherty, Arif Shukralla, Mark McCormack, Hany El-Naggar, Laura Canafoglia, Silvana Franceschetti, Barbara Castellotti, Tiziana Granata, Federico Zara, Michele Iacomino, Francesca Madia, Maria Stella Vari, Maria Margherita Mancardi, Vincenzo Salpietro, Francesca Bisulli, Paolo Tinuper, Laura Licchetta, Tommaso Pippucci, Carlotta Stipa, Raffaella Minardi, Antonio Gambardella, Angelo Labate, Grazia Annesi, Lorella Manna, Monica Gagliardi, Elena Parrini, Davide Mei, Annalisa Vetro, Claudia Bianchini, Martino Montomoli, Viola Doccini, Carla Marini, Toshimitsu Suzuki, Yushi Inoue, Kazuhiro Yamakawa, Birute Tumiene, Lynette G Sadleir, Chontelle King, Emily Mountier, Hande S Caglayan, Mutluay Arslan, Zuhal Yapıcı, Uluc Yis, Pınar Topaloglu, Bulent Kara, Dilsad Turkdogan, Aslı Gundogdu-Eken, Nerses Bebek, Sibel Uğur-İşeri, Betül Baykan, Barış Salman, Garen Haryanyan, Emrah Yücesan, Yeşim Kesim, Çiğdem Özkara, Annapurna Poduri, Beth R Shiedley, Catherine Shain, Russell J Buono, Thomas N Ferraro, Michael R Sperling, Warren Lo, Michael Privitera, Jacqueline A French, Steven Schachter, Ruben I Kuzniecky, Orrin Devinsky, Manu Hegde, Pouya Khankhanian, Katherine L Helbig, Colin A Ellis, Gianfranco Spalletta, Fabrizio Piras, Federica Piras, Tommaso Gili, Valentina Ciullo, Andreas Reif, Andrew McQuillin, Nick Bass, Andrew McIntosh, Douglas Blackwood, Mandy Johnstone, Aarno Palotie, Michele T Pato, Carlos N Pato, Evelyn J Bromet, Celia Barreto Carvalho, Eric D Achtyes, Maria Helena Azevedo, Roman Kotov, Douglas S Lehrer, Dolores Malaspina, Stephen R Marder, Helena Medeiros, Christopher P Morley, Diana O Perkins, Janet L Sobell, Peter F Buckley, Fabio Macciardi, Mark H Rapaport, James A Knowles, Genomic Psychiatry Cohort, Ayman H Fanous, Steven A McCarroll, Namrata Gupta, Stacey B Gabriel, Mark J Daly, Eric S Lander, Daniel H Lowenstein, David B Goldstein, Samuel F Berkovic, Benjamin M Neale, Epi25 Collaborative, Koko M., Krause R., Sander T., Bobbili D.R., Nothnagel M., May P., Lerche H., Bisulli F., Tinuper P., Pippucci T., Abbott, Liam E., Hengsbach, Christian, Rau, Sarah, Maisch, Ana F., Steinhoff, Bernhard J., Schulze-Bonhage, Andreas, Schubert-Bast, Susanne, Schreiber, Herbert, Borggräfe, Ingo, Schankin, Christoph J., Mayer, Thomas, Tashman, Katherine, Korinthenberg, Rudolf, Brockmann, Knut, Kurlemann, Gerhard, Dennig, Dieter, Madeleyn, Rene, Kälviäinen, Reetta, Auvinen, Pia, Saarela, Anni, Linnankivi, Tarja, Lehesjoki, Anna-Elina, Cerrato, Felecia, Rees, Mark I., Chung, Seo-Kyung, Pickrell, William O., Powell, Robert, Schneider, Natascha, Balestrini, Simona, Zagaglia, Sara, Braatz, Vera, Johnson, Michael R., Auce, Pauls, Singh, Tarjinder, Sills, Graeme J., Baum, Larry W., Sham, Pak C., Cherny, Stacey S., Lui, Colin H. T., Barišic, Nina, Delanty, Norman, Doherty, Colin P., Shukralla, Arif, McCormack, Mark, Heyne, Henrike, El-Naggar, Hany, Canafoglia, Laura, Franceschetti, Silvana, Castellotti, Barbara, Granata, Tiziana, Zara, Federico, Iacomino, Michele, Madia, Francesca, Vari, Maria Stella, Mancardi, Maria Margherita, Byrnes, Andrea, Salpietro, Vincenzo, Bisulli, Francesca, Tinuper, Paolo, Licchetta, Laura, Pippucci, Tommaso, Stipa, Carlotta, Minardi, Raffaella, Gambardella, Antonio, Labate, Angelo, Annesi, Grazia, Churchhouse, Claire, Manna, Lorella, Gagliardi, Monica, Parrini, Elena, Mei, Davide, Vetro, Annalisa, Bianchini, Claudia, Montomoli, Martino, Doccini, Viola, Marini, Carla, Suzuki, Toshimitsu, Watts, Nick, Inoue, Yushi, Yamakawa, Kazuhiro, Tumiene, Birute, Sadleir, Lynette G., King, Chontelle, Mountier, Emily, Caglayan, Hande S., Arslan, Mutluay, Yapici, Zuhal, Yis, Uluc, Solomonson, Matthew, Topaloglu, Pinar, Kara, Bulent, Turkdogan, Dilsad, Gundogdu-Eken, Asli, Bebek, Nerses, Ugur-Iseri, Sibel, Baykan, Betül, Salman, Baris, Haryanyan, Garen, Yücesan, Emrah, Lal, Dennis, Kesim, Yesim, Özkara, Çigdem, Poduri, Annapurna, Shiedley, Beth R., Shain, Catherine, Buono, Russell J., Ferraro, Thomas N., Sperling, Michael R., Lo, Warren, Privitera, Michael, Heinzen, Erin L., French, Jacqueline A., Schachter, Steven, Kuzniecky, Ruben I., Devinsky, Orrin, Hegde, Manu, Khankhanian, Pouya, Helbig, Katherine L., Ellis, Colin A., Spalletta, Gianfranco, Piras, Fabrizio, Dhindsa, Ryan S., Piras, Federica, Gili, Tommaso, Ciullo, Valentina, Reif, Andreas, McQuillin, Andrew, Bass, Nick, McIntosh, Andrew, Blackwood, Douglas, Johnstone, Mandy, Palotie, Aarno, Stanley, Kate E., Pato, Michele T., Pato, Carlos N., Bromet, Evelyn J., Carvalho, Celia Barreto, Achtyes, Eric D., Azevedo, Maria Helena, Kotov, Roman, Lehrer, Douglas S., Malaspina, Dolores, Marder, Stephen R., Cavalleri, Gianpiero L., Medeiros, Helena, Morley, Christopher P., Perkins, Diana O., Sobell, Janet L., Buckley, Peter F., Macciardi, Fabio, Rapaport, Mark H., Knowles, James A., Cohort, Genomic Psychiatry, Fanous, Ayman H., Hakonarson, Hakon, McCarroll, Steven A., Gupta, Namrata, Gabriel, Stacey B., Daly, Mark J., Lander, Eric S., Lowenstein, Daniel H., Goldstein, David B., Lerche, Holger, Berkovic, Samuel F., Neale, Benjamin M., Helbig, Ingo, Krause, Roland, May, Patrick, Weckhuysen, Sarah, Petrovski, Slavé, Kamalakaran, Sitharthan, Sisodiya, Sanjay M., Cossette, Patrick, Cotsapas, Chris, DeJonghe, Peter, Dixon-Salazar, Tracy, Guerrini, Renzo, Kwan, Patrick, Marson, Anthony G., Stewart, Randy, Depondt, Chantal, Dlugos, Dennis J., Scheffer, Ingrid E., Striano, Pasquale, Freyer, Catharine, McKenna, Kevin, Regan, Brigid M., Bellows, Susannah T., Leu, Costin, Bennett, Caitlin A., Johns, Esther M. C., Macdonald, Alexandra, Shilling, Hannah, Burgess, Rosemary, Weckhuysen, Dorien, Bahlo, Melanie, O'Brien, Terence J., Todaro, Marian, Stamberger, Hannah, Andrade, Danielle M., Sadoway, Tara R., Mo, Kelly, Krestel, Heinz, Gallati, Sabina, Papacostas, Savvas S., Kousiappa, Ioanna, Tanteles, George A., Šterbová, Katalin, Vlcková, Markéta, Sedlácková, Lucie, Laššuthová, Petra, Klein, Karl Martin, Rosenow, Felix, Reif, Philipp S., Knake, Susanne, Kunz, Wolfram S., Zsurka, Gábor, Elger, Christian E., Bauer, Jürgen, Rademacher, Michael, Feng, Yen-Chen Anne, Pendziwiat, Manuela, Muhle, Hiltrud, Rademacher, Annika, van Baalen, Andreas, von Spiczak, Sarah, Stephani, Ulrich, Afawi, Zaid, Korczyn, Amos D., Kanaan, Moien, Canavati, Christina, Howrigan, Daniel P., Müller-Schlüter, Karen, Kluger, Gerhard, Häusler, Martin, Blatt, Ilan, Lemke, Johannes R., Krey, Ilona, Weber, Yvonne G., Wolking, Stefan, Becker, Felicitas, DFG Research Unit FOR-2715 (Germany), FNR (Luxembourg), NHGRI (US), NHLBI (US), DAAD (Germany). [sponsor], and Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center]
Subjects: Exome sequencing, Male, Medicine (General), Neurology [D14] [Human health sciences], Gene-set, Genome-wide association study, Disease, Biology, Epileptogenesis, General Biochemistry, Genetics and Molecular Biology, Whole Exome Sequencing, Epilepsy, R5-920, medicine, Missense mutation, Humans, Exome, Genetic Predisposition to Disease, Gene, Genetic association, Ultra-rare variant, Genetics, Neurologie [D14] [Sciences de la santé humaine], Burden analysis, Genetic Variation, General Medicine, medicine.disease, Ultra-rare variants, Gene-sets, Case-Control Studies, Medicine, epilepsy, Epilepsy, Generalized, Female, Genetics & genetic processes [F10] [Life sciences], Epilepsies, Partial, Human medicine, Burden analysi, Génétique & processus génétiques [F10] [Sciences du vivant], Case-Control Studie, Research Paper, Genome-Wide Association Study, Human
Abstract: EBioMedicine 72, 103588 (2021). doi:10.1016/j.ebiom.2021.103588, Published by Elsevier, Amsterdam [u.a.]
Published: 2021

28. Sub-genic intolerance, ClinVar, and the epilepsies: A whole-exome sequencing study of 29,165 individuals

Author: Joshua E. Motelow, Gundula Povysil, Ryan S. Dhindsa, Kate E. Stanley, Andrew S. Al- len, Yen-Chen Anne Feng, Daniel P. Howrigan, Liam E. Abbott, Ka- therine Tashman, Felecia Cerrato, Caroline Cusick, Tarjinder Singh, Henrike Heyne, Andrea E. Byrnes, Claire Churchhouse, Nick Watts, Matthew Solomonson, Dennis Lal, Namrata Gupta, Benjamin M. Neale, Gianpiero L. Cavalleri, Patrick Cossette, Chris Cotsapas, Peter De Jonghe, Tracy Dixon-Salazar, Renzo Guerrini, Hakon Hakonarson, Erin L. Heinzen, Ingo Helbig, Patrick Kwan, Anthony G. Marson, Slave ? Petrovski, Sitharthan Kamalakaran, Sanjay M. Sisodiya, Randy Stewart, Sarah Weckhuysen, Chantal Depondt, Dennis J. Dlugos, Ingrid E. Scheffer, Pasquale Striano, Catharine Freyer, Roland Krause, Patrick May, Kevin McKenna, Brigid M. Regan, Caitlin A. Bennett, Costin Leu, Stephanie L. Leech, Terence J. O'Brien, Marian Todaro, Hannah Stamberger, Danielle M. Andrade, Quratulain Zulfiqar Ali, Tara R. Sadoway, Heinz Krestel, Andre ? Schaller, Savvas S. Papacostas, Ioanna Kou- siappa, George A. Tanteles, Yiolanda Christou, Katalin Sterbova ?, Marke ? ta Vlckova ?, Lucie Sedlackova, Petra Lassuthova ?, Karl Martin Klein, Felix Rosenow, Philipp S. Reif, Susanne Knake, Bernd A. Neubauer, Friedrich Zimprich, Martha Feucht, Eva M. Reinthaler, Wolfram S. Kunz, Ga ?bor Zsurka, Rainer Surges, Tobias Baumgart- ner, Randi von Wrede, Manuela Pendziwiat, Hiltrud Muhle, An- nika Rademacher, Andreas van Baalen, Sarah von Spiczak, Ulrich Stephani, Zaid Afawi, Amos D. Korczyn, Moien Kanaan, Christina Canavati, Gerhard Kurlemann, Karen Mu ?ller-Schlu ?ter, Gerhard Kluger, Martin Ha ?usler, Ilan Blatt, Johannes R. Lemke, Ilona Krey, Yvonne G. Weber, Stefan Wolking, Felicitas Becker, Stephan Lauxmann, Christian Boßelmann, Josua Kegele, Christian Hengs- bach, Sarah Rau, Bernhard J. Steinhoff, Andreas Schulze-Bonhage, IngoBorggra ?fe, ChristophJ.Schankin, SusanneSchubert-Bast, Herbert Schreiber, Thomas Mayer, Rudolf Korinthenberg, Knut Brockmann, Markus Wolff, Dieter Dennig, Rene Madeleyn, Reetta Ka ?lvia ?inen, Anni Saarela, Oskari Timonen, Tarja Linnankivi, Anna-Elina Lehesjoki, Sylvain Rheims, Gaetan Lesca, Philippe Ryvlin, Louis Maillard, Luc Valton, Philippe Derambure, Fabrice Bartolomei, Edouard Hirsch, Ve ?ronique Michel, Francine Chas- soux, Mark I. Rees, Seo-Kyung Chung, William O. Pickrell, Robert Powell, Mark D. Baker, Beata Fonferko-Shadrach, Charlotte Law- thom, Joseph Anderson, Natascha Schneider, Simona Balestrini, Sara Zagaglia, Vera Braatz, Michael R. Johnson, Pauls Auce, Graeme J. Sills, Larry W. Baum, Pak C. Sham, Stacey S. Cherny, Colin H.T. Lui, Norman Delanty, Colin P. Doherty, Arif Shukralla, Hany El-Naggar, Peter Widdess-Walsh, Nina Barisic, Laura 12 The American Journal of Human Genetics 108, 1-18, June 3, 2021 Please cite this article in press as: Epi25 Collaborative, Sub-genic intolerance, ClinVar, the epilepsies: A whole-exome sequencing study of 29, 165 individuals, The American Journal of Human Genetics (2021), https://doi.org/10.1016/j.ajhg.2021.04.009 Canafoglia, Silvana Franceschetti, Barbara Castellotti, Tiziana Granata, Francesca Ragona, Federico Zara, Michele Iacomino, An- tonella Riva, Francesca Madia, Maria Stella Vari, Vincenzo Salpie- tro, Marcello Scala, Maria Margherita Mancardi, Lino Nobili, Elisa- betta Amadori, Thea Giacomini, Francesca Bisulli, Tommaso Pippucci, Laura Licchetta, Raffaella Minardi, Paolo Tinuper, Lor- enzo Muccioli, Barbara Mostacci, Antonio Gambardella, Angelo Labate, Grazia Annesi, Lorella Manna, Monica Gagliardi, Elena Parrini, Davide Mei, Annalisa Vetro, Claudia Bianchini, Martino Montomoli, Viola Doccini, Carmen Barba, Shinichi Hirose, At- sushi Ishii, Toshimitsu Suzuki, Yushi Inoue, Kazuhiro Yamakawa, Ahmad Beydoun, Wassim Nasreddine, Nathalie Khoueiry Zgheib, Birute Tumiene, Algirdas Utkus, Lynette G. Sadleir, Chontelle King, S. Hande Caglayan, Mutluay Arslan, Zuhal Yap?c?, P?nar To- paloglu, Bulent Kara, Uluc Yis, Dilsad Turkdogan, Asl? Gun- dogdu-Eken, Nerses Bebek, Meng-Han Tsai, Chen-Jui Ho, Chih- Hsiang Lin, Kuang-Lin Lin, I-Jun Chou, Annapurna Poduri, Beth R. Shiedley, Catherine Shain, Jeffrey L. Noebels, Alicia Goldman, Robyn M. Busch, Lara Jehi, Imad M. Najm, Lisa Ferguson, Jean Khoury, Tracy A. Glauser, Peggy O. Clark, Russell J. Buono, Thomas N. Ferraro, Michael R. Sperling, Warren Lo, Michael Privitera, Jac- queline A. French, Steven Schachter, Ruben I. Kuzniecky, Orrin Devinsky, Manu Hegde, David A. Greenberg, Colin A. Ellis, Ethan Goldberg, Katherine L. Helbig, Mahgenn Cosico, Priya Vaidis- waran, Eryn Fitch, Samuel F. Berkovic, Holger Lerche, Daniel H. Lowenstein, David B. Goldstein., Motelow J.E., Povysil G., Dhindsa R.S., Stanley K.E., Allen A.S., Feng Y.-C.A., Howrigan D.P., Abbott L.E., Tashman K., Cerrato F., Cusick C., Singh T., Heyne H., Byrnes A.E., Churchhouse C., Watts N., Solomonson M., Lal D., Gupta N., Neale B.M., Cavalleri G.L., Cossette P., Cotsapas C., De Jonghe P., Dixon-Salazar T., Guerrini R., Hakonarson H., Heinzen E.L., Helbig I., Kwan P., Marson A.G., Petrovski S., Kamalakaran S., Sisodiya S.M., Stewart R., Weckhuysen S., Depondt C., Dlugos D.J., Scheffer I.E., Striano P., Freyer C., Krause R., May P., McKenna K., Regan B.M., Bennett C.A., Leu C., Leech S.L., O'Brien T.J., Todaro M., Stamberger H., Andrade D.M., Ali Q.Z., Sadoway T.R., Krestel H., Schaller A., Papacostas S.S., Kousiappa I., Tanteles G.A., Christou Y., Sterbova K., Vlckova M., Sedlackova L., Lassuthova P., Klein K.M., Rosenow F., Reif P.S., Knake S., Neubauer B.A., Zimprich F., Feucht M., Reinthaler E.M., Kunz W.S., Zsurka G., Surges R., Baumgartner T., von Wrede R., Pendziwiat M., Muhle H., Rademacher A., van Baalen A., von Spiczak S., Stephani U., Afawi Z., Korczyn A.D., Kanaan M., Canavati C., Kurlemann G., Muller-Schluter K., Kluger G., Hausler M., Blatt I., Lemke J.R., Krey I., Weber Y.G., Wolking S., Becker F., Lauxmann S., Bosselmann C., Kegele J., Hengsbach C., Rau S., Steinhoff B.J., Schulze-Bonhage A., Borggrafe I., Schankin C.J., Schubert-Bast S., Schreiber H., Mayer T., Korinthenberg R., Brockmann K., Wolff M., Dennig D., Madeleyn R., Kalviainen R., Saarela A., Timonen O., Linnankivi T., Lehesjoki A.-E., Rheims S., Lesca G., Ryvlin P., Maillard L., Valton L., Derambure P., Bartolomei F., Hirsch E., Michel V., Chassoux F., Rees M.I., Chung S.-K., Pickrell W.O., Powell R., Baker M.D., Fonferko-Shadrach B., Lawthom C., Anderson J., Schneider N., Balestrini S., Zagaglia S., Braatz V., Johnson M.R., Auce P., Sills G.J., Baum L.W., Sham P.C., Cherny S.S., Lui C.H.T., Delanty N., Doherty C.P., Shukralla A., El-Naggar H., Widdess-Walsh P., Barisic N., Canafoglia L., Franceschetti S., Castellotti B., Granata T., Ragona F., Zara F., Iacomino M., Riva A., Madia F., Vari M.S., Salpietro V., Scala M., Mancardi M.M., Nobili L., Amadori E., Giacomini T., Bisulli F., Pippucci T., Licchetta L., Minardi R., Tinuper P., Muccioli L., Mostacci B., Gambardella A., Labate A., Annesi G., Manna L., Gagliardi M., Parrini E., Mei D., Vetro A., Bianchini C., Montomoli M., Doccini V., Barba C., Hirose S., Ishii A., Suzuki T., Inoue Y., Yamakawa K., Beydoun A., Nasreddine W., Khoueiry Zgheib N., Tumiene B., Utkus A., Sadleir L.G., King C., Caglayan S.H., Arslan M., Yapici Z., Topaloglu P., Kara B., Yis U., Turkdogan D., Gundogdu-Eken A., Bebek N., Tsai M.-H., Ho C.-J., Lin C.-H., Lin K.-L., Chou I.-J., Poduri A., Shiedley B.R., Shain C., Noebels J.L., Goldman A., Busch R.M., Jehi L., Najm I.M., Ferguson L., Khoury J., Glauser T.A., Clark P.O., Buono R.J., Ferraro T.N., Sperling M.R., Lo W., Privitera M., French J.A., Schachter S., Kuzniecky R.I., Devinsky O., Hegde M., Greenberg D.A., Ellis C.A., Goldberg E., Helbig K.L., Cosico M., Vaidiswaran P., Fitch E., Berkovic S.F., Lerche H., Lowenstein D.H., Goldstein D.B., Epi25 Collaborative, Institut de Neurosciences des Systèmes (INS), and Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM)
Subjects: 0301 basic medicine, focal epilepsy, Whole Exome Sequencing, Cohort Studies, Epilepsy, 0302 clinical medicine, Genetic Marker, Missense mutation, Exome, whole-exome sequencing, generalized epilepsy, ComputingMilieux_MISCELLANEOUS, Genetics (clinical), Exome sequencing, seizures, Genetics, ClinVar, Phenotype, epileptic encephalopathy, Epi25, intolerance, Case-Control Studie, Human, Genetic Markers, seizure, Disease Association, Biology, Article, 03 medical and health sciences, Exome Sequencing, medicine, Humans, Genetic Predisposition to Disease, Genetic Testing, Generalized epilepsy, Gene, Louvain, [SCCO.NEUR]Cognitive science/Neuroscience, Correction, Genetic Variation, medicine.disease, epilepsy, Human genetics, 030104 developmental biology, Case-Control Studies, Human medicine, Cohort Studie, Genetic generalized epilepsy, 030217 neurology & neurosurgery
Abstract: Summary Both mild and severe epilepsies are influenced by variants in the same genes, yet an explanation for the resulting phenotypic variation is unknown. As part of the ongoing Epi25 Collaboration, we performed a whole-exome sequencing analysis of 13,487 epilepsy-affected individuals and 15,678 control individuals. While prior Epi25 studies focused on gene-based collapsing analyses, we asked how the pattern of variation within genes differs by epilepsy type. Specifically, we compared the genetic architectures of severe developmental and epileptic encephalopathies (DEEs) and two generally less severe epilepsies, genetic generalized epilepsy and non-acquired focal epilepsy (NAFE). Our gene-based rare variant collapsing analysis used geographic ancestry-based clustering that included broader ancestries than previously possible and revealed novel associations. Using the missense intolerance ratio (MTR), we found that variants in DEE-affected individuals are in significantly more intolerant genic sub-regions than those in NAFE-affected individuals. Only previously reported pathogenic variants absent in available genomic datasets showed a significant burden in epilepsy-affected individuals compared with control individuals, and the ultra-rare pathogenic variants associated with DEE were located in more intolerant genic sub-regions than variants associated with non-DEE epilepsies. MTR filtering improved the yield of ultra-rare pathogenic variants in affected individuals compared with control individuals. Finally, analysis of variants in genes without a disease association revealed a significant burden of loss-of-function variants in the genes most intolerant to such variation, indicating additional epilepsy-risk genes yet to be discovered. Taken together, our study suggests that genic and sub-genic intolerance are critical characteristics for interpreting the effects of variation in genes that influence epilepsy.
Published: 2021

29. Whole-Exome Sequencing in NF1-Related West Syndrome Leads to the Identification of KCNC2 as a Novel Candidate Gene for Epilepsy

Author: Hiltrud Muhle, A. Rohr, Annika Rademacher, Ingo Helbig, Andreas van Baalen, Yvonne G. Weber, Manuela Pendziwiat, Simone Seiffert, and Niklas Schwarz
Subjects: 0301 basic medicine, congenital, hereditary, and neonatal diseases and abnormalities, Candidate gene, Neurofibromatosis 1, Comorbidity, Bioinformatics, Genetic analysis, 03 medical and health sciences, Epilepsy, 0302 clinical medicine, Exome Sequencing, medicine, Humans, Neurofibromatosis, Exome sequencing, Neurocutaneous Syndromes, business.industry, Infant, West Syndrome, General Medicine, medicine.disease, nervous system diseases, 030104 developmental biology, Shaw Potassium Channels, Pediatrics, Perinatology and Child Health, Etiology, Neurology (clinical), business, Spasms, Infantile, 030217 neurology & neurosurgery
Abstract: Patients with neurofibromatosis type 1 (NF1) have an increased risk for West syndrome (WS), but the underlying mechanisms linking NF1 and WS are unknown. In contrast to other neurocutaneous syndromes, intracerebral abnormalities explaining the course of infantile spasms (IS) are often absent and the seizure outcome is usually favorable. Several studies have investigated a potential genotype–phenotype correlation between NF1 and seizure susceptibility, but an association was not identified. Therefore, we identified three patients with NF1-related WS (NF1-WS) in a cohort of 51 NF1 patients and performed whole-exome sequencing (WES) to identify genetic modifiers. In two NF1 patients with WS and good seizure outcome, we did not identify variants in epilepsy-related genes. However, in a single patient with NF1-WS and transition to drug-resistant epilepsy, we identified a de novo variant in KCNC2 (c.G499T, p.D167Y) coding for Kv3.2 as a previously undescribed potassium channel to be correlated to epilepsy. Electrophysiological studies of the identified KCNC2 variant demonstrated both a strong loss-of-function effect for the current amplitude and a gain-of-function effect for the channel activation recommending a complex network effect. These results suggest that systematic genetic analysis for potentially secondary genetic etiologies in NF1 patients and severe epilepsy presentations should be done.
Published: 2020

30. TANGO2: expanding the clinical phenotype and spectrum of pathogenic variants

Author: Alison M. Muir, Dianne Laboy Cintrón, Katherine H. Kim, Amber Begtrup, Peter I. Karachunski, Almuth Caliebe, Heather C Mefford, Amy Lacroix, J. Lawrence Merritt, Kirsty McWalter, Angela Sun, Sharon F. Suchy, Barbara K. Burton, Ingo Helbig, René Santer, Joline C. Dalton, Dmitriy Niyazov, Rachel Westman, Ganka Douglas, Leah Fleming, Hiltrud Muhle, Kristin G. Monaghan, Alice Basinger, Katherine L. Helbig, Jenny Thies, Kolja Becker, Manuela Pendziwiat, Can Ficicioglu, Megan T. Cho, Jennifer N. Dines, Francisca Millan, and Katie Golden-Grant
Subjects: Male, 0301 basic medicine, Adolescent, DNA Copy Number Variations, Genotype, Developmental Disabilities, Encephalopathy, developmental delay DNA copy-number variation, 030105 genetics & heredity, Compound heterozygosity, Bioinformatics, Article, 03 medical and health sciences, Epilepsy, Genotype-phenotype distinction, Seizures, Intellectual Disability, Intellectual disability, medicine, Humans, Exome, Family, intragenic deletion, Child, Genetics (clinical), Exome sequencing, Brain Diseases, business.industry, Aryl Hydrocarbon Receptor Nuclear Translocator, Correction, medicine.disease, Phenotype, Pedigree, 3. Good health, 030104 developmental biology, Child, Preschool, epilepsy, Female, business, exome sequencing
Abstract: Purpose TANGO2-related disorders were first described in 2016 and prior to this publication, only 15 individuals with TANGO2-related disorder were described in the literature. Primary features include metabolic crisis with rhabdomyolysis, encephalopathy, intellectual disability, seizures, and cardiac arrhythmias. We assess whether genotype and phenotype of TANGO2-related disorder has expanded since the initial discovery and determine the efficacy of exome sequencing (ES) as a diagnostic tool for detecting variants. Methods We present a series of 14 individuals from 11 unrelated families with complex medical and developmental histories, in whom ES or microarray identified compound heterozygous or homozygous variants in TANGO2. Results The initial presentation of patients with TANGO2-related disorders can be variable, including primarily neurological presentations. We expand the phenotype and genotype for TANGO2, highlighting the variability of the disorder. Conclusion TANGO2-related disorders can have a more diverse clinical presentation than previously anticipated. We illustrate the utility of routine ES data reanalysis whereby discovery of novel disease genes can lead to a diagnosis in previously unsolved cases and the need for additional copy-number variation analysis when ES is performed.
Published: 2018

31. Mutations in PMPCB Encoding the Catalytic Subunit of the Mitochondrial Presequence Protease Cause Neurodegeneration in Early Childhood

Author: F.-Nora Vögtle, Carolyn F. Delto, Hiltrud Muhle, Nils Burger, Marisa W. Friederich, Johanna A. Jähn, Ingo Helbig, Audrey Burnett, Maie Walsh, Naomichi Matsumoto, Cansu Kücükköse, Björn Brändl, Franz-Josef Müller, Hung-Chun Yu, Andreas van Baalen, Deepali N. Shinde, Austin Larson, Susan M. White, Alice Basinger, Noriko Miyake, Oliver Keminer, Ulrich Stephani, Manuela Pendziwiat, Dirk Mossmann, Lisa Myketin, Katherine L. Helbig, Mark A. Lovell, Johan L.K. Van Hove, and Publica
Subjects: Iron-Sulfur Proteins, Male, 0301 basic medicine, Saccharomyces cerevisiae Proteins, Mitochondrial disease, Induced Pluripotent Stem Cells, Respiratory chain, Saccharomyces cerevisiae, Mitochondrion, medicine.disease_cause, Proto-Oncogene Mas, Article, Electron Transport, 03 medical and health sciences, Catalytic Domain, Genetics, medicine, Humans, Child, PMPCB, Genetics (clinical), Mutation, biology, Neurodegeneration, Metalloendopeptidases, Dermis, Fibroblasts, medicine.disease, Magnetic Resonance Imaging, Mitochondria, Pedigree, Cell biology, 030104 developmental biology, Child, Preschool, Nerve Degeneration, Frataxin, biology.protein, Female, Biogenesis
Abstract: Mitochondrial disorders causing neurodegeneration in childhood are genetically heterogeneous, and the underlying genetic etiology remains unknown in many affected individuals. We identified biallelic variants in PMPCB in individuals of four families including one family with two affected siblings with neurodegeneration and cerebellar atrophy. PMPCB encodes the catalytic subunit of the essential mitochondrial processing protease (MPP), which is required for maturation of the majority of mitochondrial precursor proteins. Mitochondria isolated from two fibroblast cell lines and induced pluripotent stem cells derived from one affected individual and differentiated neuroepithelial stem cells showed reduced PMPCB levels and accumulation of the processing intermediate of frataxin, a sensitive substrate for MPP dysfunction. Introduction of the identified PMPCB variants into the homologous S. cerevisiae Mas1 protein resulted in a severe growth and MPP processing defect leading to the accumulation of mitochondrial precursor proteins and early impairment of the biogenesis of iron-sulfur clusters, which are indispensable for a broad range of crucial cellular functions. Analysis of biopsy materials of an affected individual revealed changes and decreased activity in iron-sulfur cluster-containing respiratory chain complexes and dysfunction of mitochondrial and cytosolic Fe-S cluster-dependent enzymes. We conclude that biallelic mutations in PMPCB cause defects in MPP proteolytic activity leading to dysregulation of iron-sulfur cluster biogenesis and triggering a complex neurological phenotype of neurodegeneration in early childhood.
Published: 2018

32. Mutations in GABRB3

Author: Sarah von Spiczak, Sabina Vejzovic, Nicolas Chatron, Laurence L Francois, Guido Rubboli, Julitta de Bellescize, Konstantin Mukhin, Holger Lerche, Marielle E M Swinkels, Johannes R. Lemke, Julia Jacobs, Susanne Blichfeldt, Hans Holthausen, Gaetan Lesca, Inga Talvik, Niels Tommerup, Heather C Mefford, Hiltrud Muhle, Tiina Talvik, Cornelia Betzler, Holly Dubbs, Line H.G. Larsen, Gerhard Kluger, Candace T. Myers, Renzo Guerrini, Steffen Syrbe, Yuan Mang, Marina Nikanorova, Sarah Hopkins, Ingo Helbig, Katrine M Johannesen, Snezana Maljevic, Ingo Borggraefe, Thomas V. Wuttke, Manuela Pendziwiat, Nils Holert, Hans Atli Dahl, Koen L.I. van Gassen, Rikke S. Møller, Carla Marini, Ulvi Vaher, and Eva H. Brilstra
Subjects: Male, 0301 basic medicine, Proband, Heterozygote, Patch-Clamp Techniques, Biology, Bioinformatics, medicine.disease_cause, Article, Membrane Potentials, Cohort Studies, Xenopus laevis, 03 medical and health sciences, Epilepsy, 0302 clinical medicine, Journal Article, medicine, Animals, Humans, Child, Automation, Laboratory, Genetics, Mutation, Massive parallel sequencing, Infant, Newborn, High-Throughput Nucleotide Sequencing, Infant, Heterozygote advantage, West Syndrome, Receptors, GABA-A, medicine.disease, Phenotype, 030104 developmental biology, Child, Preschool, Oocytes, GABAergic, Female, Neurology (clinical), 030217 neurology & neurosurgery
Abstract: Objective:To examine the role of mutations in GABRB3 encoding the β3 subunit of the GABAA receptor in individual patients with epilepsy with regard to causality, the spectrum of genetic variants, their pathophysiology, and associated phenotypes.Methods:We performed massive parallel sequencing of GABRB3 in 416 patients with a range of epileptic encephalopathies and childhood-onset epilepsies and recruited additional patients with epilepsy with GABRB3 mutations from other research and diagnostic programs.Results:We identified 22 patients with heterozygous mutations in GABRB3, including 3 probands from multiplex families. The phenotypic spectrum of the mutation carriers ranged from simple febrile seizures, genetic epilepsies with febrile seizures plus, and epilepsy with myoclonic-atonic seizures to West syndrome and other types of severe, early-onset epileptic encephalopathies. Electrophysiologic analysis of 7 mutations in Xenopus laevis oocytes, using coexpression of wild-type or mutant β3, together with α5 and γ2s subunits and an automated 2-microelectrode voltage-clamp system, revealed reduced GABA-induced current amplitudes or GABA sensitivity for 5 of 7 mutations.Conclusions:Our results indicate that GABRB3 mutations are associated with a broad phenotypic spectrum of epilepsies and that reduced receptor function causing GABAergic disinhibition represents the relevant disease mechanism.
Published: 2017

33. PIGT-CDG, a disorder of the glycosylphosphatidylinositol anchor:description of 13 novel patients and expansion of the clinical characteristics

Author: Elena Gardella, Dejan Dukic, Denise Horn, Dragana Josifova, Jenny C. Taylor, Alexej Knaus, Agnieszka Charzewska, Rikke S. Møller, Helle Hjalgrim, Dorota Hoffman-Zacharska, Emma Clement, Rachel Horton, Usha Kini, Jane A. Hurst, Alistair T. Pagnamenta, Line H.G. Larsen, Karine Lascelles, Annika Wollenberg Juul, Allan Bayat, Mina Ryten, Deb K. Pal, Julie Vogt, Peter Krawitz, Ingo Helbig, Yvonne G. Weber, Manuela Pendziwiat, and Ewa Obersztyn
Subjects: Male, Pediatrics, medicine.medical_specialty, Genotype, Glycosylphosphatidylinositols, Developmental Disabilities, Neonatal onset, Compound heterozygosity, Epilepsy, congenital disorder of glycosylation, Seizures, genotype–phenotype, medicine, Humans, Abnormalities, Multiple, Glycosylphosphatidylinositol anchor, Child, Genetic Association Studies, Genetics (clinical), Genetic testing, medicine.diagnostic_test, business.industry, computer-assisted facial gestalt analysis, Homozygote, Infant, Newborn, Infant, medicine.disease, Phenotype, Hypotonia, Pedigree, Child, Preschool, Mutation, epilepsy, Female, medicine.symptom, PIGT-CDG, business, Congenital disorder of glycosylation, Acyltransferases
Abstract: Purpose: To provide a detailed electroclinical description and expand the phenotype of PIGT-CDG, to perform genotype-phenotype correlation, and to investigate the onset and severity of the epilepsy associated with the different genetic subtypes of this rare disorder. Furthermore, to use computer-assisted facial gestalt analysis in PIGT-CDG and to the compare findings with other glycosylphosphatidylinositol (GPI) anchor deficiencies. Methods: We evaluated 13 children from eight unrelated families with homozygous or compound heterozygous pathogenic variants in PIGT. Results: All patients had hypotonia, severe developmental delay, and epilepsy. Epilepsy onset ranged from first day of life to two years of age. Severity of the seizure disorder varied from treatable seizures to severe neonatal onset epileptic encephalopathies. The facial gestalt of patients resembled that of previously published PIGT patients as they were closest to the center of the PIGT cluster in the clinical face phenotype space and were distinguishable from other gene-specific phenotypes. Conclusion: We expand our knowledge of PIGT. Our cases reaffirm that the use of genetic testing is essential for diagnosis in this group of disorders. Finally, we show that computer-assisted facial gestalt analysis accurately assigned PIGT cases to the multiple congenital anomalies-hypotonia-seizures syndrome phenotypic series advocating the additional use of next-generation phenotyping technology.
Published: 2019

34. Heterozygous Variants in KMT2E Cause a Spectrum of Neurodevelopmental Disorders and Epilepsy

Author: Anne H. O’Donnell-Luria, Lynn S. Pais, Víctor Faundes, Jordan C. Wood, Abigail Sveden, Victor Luria, Rami Abou Jamra, Andrea Accogli, Kimberly Amburgey, Britt Marie Anderlid, Silvia Azzarello-Burri, Alice A. Basinger, Claudia Bianchini, Lynne M. Bird, Rebecca Buchert, Wilfrid Carre, Sophia Ceulemans, Perrine Charles, Helen Cox, Lisa Culliton, Aurora Currò, Florence Demurger, James J. Dowling, Benedicte Duban-Bedu, Christèle Dubourg, Saga Elise Eiset, Luis F. Escobar, Alessandra Ferrarini, Tobias B. Haack, Mona Hashim, Solveig Heide, Katherine L. Helbig, Ingo Helbig, Raul Heredia, Delphine Héron, Bertrand Isidor, Amy R. Jonasson, Pascal Joset, Boris Keren, Fernando Kok, Hester Y. Kroes, Alinoë Lavillaureix, Xin Lu, Saskia M. Maas, Gustavo H.B. Maegawa, Carlo L.M. Marcelis, Paul R. Mark, Marcelo R. Masruha, Heather M. McLaughlin, Kirsty McWalter, Esther U. Melchinger, Saadet Mercimek-Andrews, Caroline Nava, Manuela Pendziwiat, Richard Person, Gian Paolo Ramelli, Luiza L.P. Ramos, Anita Rauch, Caitlin Reavey, Alessandra Renieri, Angelika Rieß, Amarilis Sanchez-Valle, Shifteh Sattar, Carol Saunders, Niklas Schwarz, Thomas Smol, Myriam Srour, Katharina Steindl, Steffen Syrbe, Jenny C. Taylor, Aida Telegrafi, Isabelle Thiffault, Doris A. Trauner, Helio van der Linden, Silvana van Koningsbruggen, Laurent Villard, Ida Vogel, Julie Vogt, Yvonne G. Weber, Ingrid M. Wentzensen, Elysa Widjaja, Jaroslav Zak, Samantha Baxter, Siddharth Banka, Lance H. Rodan, Jeremy F. McRae, Stephen Clayton, Tomas W. Fitzgerald, Joanna Kaplanis, Elena Prigmore, Diana Rajan, Alejandro Sifrim, Stuart Aitken, Nadia Akawi, Mohsan Alvi, Kirsty Ambridge, Daniel M. Barrett, Tanya Bayzetinova, Philip Jones, Wendy D. Jones, Daniel King, Netravathi Krishnappa, Laura E. Mason, Tarjinder Singh, Adrian R. Tivey, Munaza Ahmed, Uruj Anjum, Hayley Archer, Ruth Armstrong, Jana Awada, Meena Balasubramanian, Diana Baralle, Angela Barnicoat, Paul Batstone, David Baty, Chris Bennett, Jonathan Berg, Birgitta Bernhard, A. Paul Bevan, Maria Bitner-Glindzicz, Edward Blair, Moira Blyth, David Bohanna, Louise Bourdon, David Bourn, Lisa Bradley, Angela Brady, Simon Brent, Carole Brewer, Kate Brunstrom, David J. Bunyan, John Burn, Natalie Canham, Bruce Castle, Kate Chandler, Elena Chatzimichali, Deirdre Cilliers, Angus Clarke, Susan Clasper, Jill Clayton-Smith, Virginia Clowes, Andrea Coates, Trevor Cole, Irina Colgiu, Amanda Collins, Morag N. Collinson, Fiona Connell, Nicola Cooper, Lara Cresswell, Gareth Cross, Yanick Crow, Mariella D’Alessandro, Tabib Dabir, Rosemarie Davidson, Sally Davies, Dylan de Vries, John Dean, Charu Deshpande, Gemma Devlin, Abhijit Dixit, Angus Dobbie, Alan Donaldson, Dian Donnai, Deirdre Donnelly, Carina Donnelly, Angela Douglas, Sofia Douzgou, Alexis Duncan, Jacqueline Eason, Sian Ellard, Ian Ellis, Frances Elmslie, Karenza Evans, Sarah Everest, Tina Fendick, Richard Fisher, Frances Flinter, Nicola Foulds, Andrew Fry, Alan Fryer, Carol Gardiner, Lorraine Gaunt, Neeti Ghali, Richard Gibbons, Harinder Gill, Judith Goodship, David Goudie, Emma Gray, Andrew Green, Philip Greene, Lynn Greenhalgh, Susan Gribble, Rachel Harrison, Lucy Harrison, Victoria Harrison, Rose Hawkins, Liu He, Stephen Hellens, Alex Henderson, Sarah Hewitt, Lucy Hildyard, Emma Hobson, Simon Holden, Muriel Holder, Susan Holder, Georgina Hollingsworth, Tessa Homfray, Mervyn Humphreys, Jane Hurst, Ben Hutton, Stuart Ingram, Melita Irving, Lily Islam, Andrew Jackson, Joanna Jarvis, Lucy Jenkins, Diana Johnson, Elizabeth Jones, Dragana Josifova, Shelagh Joss, Beckie Kaemba, Sandra Kazembe, Rosemary Kelsell, Bronwyn Kerr, Helen Kingston, Usha Kini, Esther Kinning, Gail Kirby, Claire Kirk, Emma Kivuva, Alison Kraus, Dhavendra Kumar, V. K. Ajith Kumar, Katherine Lachlan, Wayne Lam, Anne Lampe, Caroline Langman, Melissa Lees, Derek Lim, Cheryl Longman, Gordon Lowther, Sally A. Lynch, Alex Magee, Eddy Maher, Alison Male, Sahar Mansour, Karen Marks, Katherine Martin, Una Maye, Emma McCann, Vivienne McConnell, Meriel McEntagart, Ruth McGowan, Kirsten McKay, Shane McKee, Dominic J. McMullan, Susan McNerlan, Catherine McWilliam, Sarju Mehta, Kay Metcalfe, Anna Middleton, Zosia Miedzybrodzka, Emma Miles, Shehla Mohammed, Tara Montgomery, David Moore, Sian Morgan, Jenny Morton, Hood Mugalaasi, Victoria Murday, Helen Murphy, Swati Naik, Andrea Nemeth, Louise Nevitt, Ruth Newbury-Ecob, Andrew Norman, Rosie O’Shea, Caroline Ogilvie, Kai-Ren Ong, Soo-Mi Park, Michael J. Parker, Chirag Patel, Joan Paterson, Stewart Payne, Daniel Perrett, Julie Phipps, Daniela T. Pilz, Martin Pollard, Caroline Pottinger, Joanna Poulton, Norman Pratt, Katrina Prescott, Sue Price, Abigail Pridham, Annie Procter, Hellen Purnell, Oliver Quarrell, Nicola Ragge, Raheleh Rahbari, Josh Randall, Julia Rankin, Lucy Raymond, Debbie Rice, Leema Robert, Eileen Roberts, Jonathan Roberts, Paul Roberts, Gillian Roberts, Alison Ross, Elisabeth Rosser, Anand Saggar, Shalaka Samant, Julian Sampson, Richard Sandford, Ajoy Sarkar, Susann Schweiger, Richard Scott, Ingrid Scurr, Ann Selby, Anneke Seller, Cheryl Sequeira, Nora Shannon, Saba Sharif, Charles Shaw-Smith, Emma Shearing, Debbie Shears, Eamonn Sheridan, Ingrid Simonic, Roldan Singzon, Zara Skitt, Audrey Smith, Kath Smith, Sarah Smithson, Linda Sneddon, Miranda Splitt, Miranda Squires, Fiona Stewart, Helen Stewart, Volker Straub, Mohnish Suri, Vivienne Sutton, Ganesh Jawahar Swaminathan, Elizabeth Sweeney, Kate Tatton-Brown, Cat Taylor, Rohan Taylor, Mark Tein, I. Karen Temple, Jenny Thomson, Marc Tischkowitz, Susan Tomkins, Audrey Torokwa, Becky Treacy, Claire Turner, Peter Turnpenny, Carolyn Tysoe, Anthony Vandersteen, Vinod Varghese, Pradeep Vasudevan, Parthiban Vijayarangakannan, Emma Wakeling, Sarah Wallwark, Jonathon Waters, Astrid Weber, Diana Wellesley, Margo Whiteford, Sara Widaa, Sarah Wilcox, Emily Wilkinson, Denise Williams, Nicola Williams, Louise Wilson, Geoff Woods, Christopher Wragg, Michael Wright, Laura Yates, Michael Yau, Chris Nellåker, Michael Parker, Helen V. Firth, Caroline F. Wright, David R. FitzPatrick, Jeffrey C. Barrett, Matthew E. Hurles, Department of Medicine 1, Friedrich-Alexander Universität Erlangen-Nürnberg (FAU), Center for Medical Genetics, Istituto di Scienze e Tecnologie della Cognizione, Consiglio Nazionale delle Ricerche (ISTC, CNR), Istituto di Scienze e Tecnologie della Cognizione, Station biologique de Roscoff [Roscoff] (SBR), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Génétique médicale [Centre Hospitalier de Vannes], Centre hospitalier Bretagne Atlantique (Morbihan) (CHBA), Department of Pediatrics, University of Michigan [Ann Arbor], University of Michigan System-University of Michigan System, Centre de Génétique Chromosomique [Hôpital Saint Vincent de Paul], Hôpital Saint Vincent de Paul-Groupement des Hôpitaux de l'Institut Catholique de Lille (GHICL), Université catholique de Lille (UCL)-Université catholique de Lille (UCL), Institut de Génétique et Développement de Rennes (IGDR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Service de génétique médicale, Centre Hospitalier Universitaire Vaudois [Lausanne] (CHUV), Institute of Human Genetics, Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM)-Helmholtz Zentrum München = German Research Center for Environmental Health, Groupe de Recherche Clinique : Déficience Intellectuelle et Autisme (GRC), Université Pierre et Marie Curie - Paris 6 (UPMC), Children’s Hospital of Philadelphia (CHOP ), Service de Génétique Médicale, Centre hospitalier universitaire de Nantes (CHU Nantes), Department of Public Health Sciences, Karolinska Institutet [Stockholm], Department of Molecular and Human Genetics, Baylor College of Medicine (BCM), Baylor University-Baylor University, Institute of Medical Genetics, Universität Zürich [Zürich] = University of Zurich (UZH), Università degli Studi di Camerino = University of Camerino (UNICAM), Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), University of Oxford, GeneDx [Gaithersburg, MD, USA], Department of Clinical Genetics (Academic Medical Center, University of Amsterdam), VU University Medical Center [Amsterdam], Marseille medical genetics - Centre de génétique médicale de Marseille (MMG), Aix Marseille Université (AMU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Department of Clinical Genetics, Aarhus University Hospital, Boston Children's Hospital, Wellcome Trust Genome Campus, The Wellcome Trust Sanger Institute [Cambridge], Institute of Biomedical Engineering [Oxford] (IBME), Climatic Research Unit, University of East Anglia [Norwich] (UEA), Imperial College London, St Mary's Hospital, East Anglian Medical Genetics Service, Cytogenetics Laboratory, Addenbrooke's Hospital, Sheffield Children's NHS Foundation Trust, Regional Genetic Service, St Mary's Hospital, Manchester, Genetics, University of Southampton, Great Ormond Street Hospital for Children [London] (GOSH), Yorkshire Regional Clinical Genetics Service, Chapel Allerton Hospital, Molecular and Clinical Medicine [Dundee, UK] (School of Medicine), University of Dundee [UK]-Ninewells Hospital & Medical School [Dundee, UK], Department of Clinical Genetics, Oxford Regional Genetics Service, The Churchill hospital, North West Thames Regional Genetics, Northwick Park Hospital, Royal Devon & Exeter Hospital, Wessex Clinical Genetics Service, Wessex clinical genetics service, Manchester University NHS Foundation Trust (MFT), West Midlands Regional Genetics Service, Birmingham Women's and Children's NHS Foundation Trust, Our Lady's hospital for Sick Children, Our Lady's Hospital for Sick Children, Guy's Hospital [London], University Hospitals Leicester, University of Edinburgh, Belfast City Hospital, Ferguson-Smith Centre for Clinical Genetics, Yorkhill Hospitals, Institute of Medical Genetics, Heath Park, Cardiff, The London Clinic, Nottingham City Hospital, Clinical Genetics Department, St Michael's Hospital, Department of Genetic Medicine, Nottingham Clinical Genetics Service, Nottingham University Hospitals NHS Trust (NUH), Royal Devon and Exeter Foundation Trust, Histopathology, St. George's Hospital, Teesside Genetics Unit, James Cook University (JCU), Kansas State University, Liverpool Women's NHS Foundation Trust, Department of Medical Genetics, HMNC Brain Health, North West Thames Regional Genetics Service, Northwick Park Hospital, Harrow, Leicester Royal Infirmary, University Hospitals Leicester-University Hospitals Leicester, Ninewells Hospital and Medical School [Dundee], Academic Centre on Rare Diseases (ACoRD), University College Dublin [Dublin] (UCD), Oxford Brookes University, Institute of medicinal plant development, Chinese Academy of Medical Sciences, Newcastle Upon Tyne Hospitals NHS Trust, Service d'explorations fonctionnelles respiratoires [Lille], Department of Computer Science - Trinity College Dublin, University of Dublin, Department of Clinical Genetics (Sheffield Children’s NHS Foundation Trust), Division of Medical & Molecular Genetics, NHS Greater Glasgow & Clyde [Glasgow] (NHSGGC), Department of Clinical Genetics [Churchill Hospital], Churchill Hospital Oxford Centre for Haematology, Weizmann Institute of Science [Rehovot, Israël], Southampton General Hospital, Western General Hospital, Head of the Department of Medical Genetics, University of Birmingham [Birmingham], SW Thames Regional Genetics Service, St Georgeâ™s University of London, London, Institut Cochin (IC UM3 (UMR 8104 / U1016)), Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), All Wales Medical Genetics Services, Singleton Hospital, Central Manchester University Hospitals NHS Foundation Trust, University of North Texas (UNT), Clinical Genetics, Northern Genetics Service, Newcastle University [Newcastle], United Kingdom Met Office [Exeter], Institute of Medical Genetics (University Hospital of Wales), University Hospital of Wales (UHW), West Midlands Regional Genetics Laboratory and Clinical Genetics Unit, Birmingham Women's Hospital, Laboratory of Molecular Genetics, National Institute of Child Health and Human Development, National Institutes of Health, Department of Genetics, Cell- and Immunobiology, Semmelweis University, University Hospitals Bristol, Marketing (MKT), EESC-GEM Grenoble Ecole de Management, Addenbrookes Hospital, West of Scotland Genetics Service (Queen Elizabeth University Hospital), University Hospital Birmingham Queen Elizabeth, Department of Clnical Genetics, Chapel Allerton Hospital, Department of Clinical Genetics, Northampton General Hospital, Northampton, Royal Devon and Exeter Hospital [Exeter, UK] (RDEH), Guy's and St Thomas' Hospital [London], School of Computer Science, Bangor University, University Hospital Southampton, Clinical Genetics Unit, St Georges, University of London, Medical Genetics, Cardiff University, Research and Development, Futurelab, Nottingham Regional Genetics Service [Nottingham, UK], Nottingham University Hospitals NHS Trust (NUH)-City Hospital Campus [Nottingham, UK], University of St Andrews [Scotland], Clinical Genetics Service, Nottingham University Hospitals NHS Trust - City Hospital Campus, West Midlands Regional Genetics Unit, Department of Neurology, Johns Hopkins University (JHU), Oxford University Hospitals NHS Trust, St James's University Hospital, Leeds Teaching Hospitals NHS Trust, Addenbrooke's Hospital, Cambridge University NHS Trust, Institute of Human Genetics, Newcastle, Division of Biological Stress Response [Amsterdam, The Netherlands], The Netherlands Cancer Institute [Amsterdam, The Netherlands], Johns Hopkins Bloomberg School of Public Health [Baltimore], Birmingham Women’s Hospital, Department of Genetics, Portuguese Oncology Institute, Molecular Genetics, IWK Health Centre, IWK health centre, North West london hospitals NHS Trust, Department of Clinical Genetics (Queen Elizabeth University Hospital, Glasgow), Queen Elizabeth University Hospital (Glasgow), Birmingham women's hospital, Birmingham, Ethox Centre, Department of Public Health and Primary Health Care, University of Oxford, Badenoch Building, Old Road Campus, Headington, R01 HD091846, Eunice Kennedy Shriver National Institute of Child Health and Human Development, National Human Genome Research Institute, National Institutes of Health’s National Institute of Child Health and Human Development, Boston Children’s Hospital Faculty Development Fellowship, UM1HG008900, Broad Center for Mendelian Genomics, Chile’s National Commission for Scientific and Technological Research, DFG WE4896/3-1, German Research Society, WT 100127, Health Innovation Challenge Fund, Comprehensive Clinical Research Network, Skaggs-Oxford Scholarship, 10/H0305/83, Cambridge South REC, REC GEN/284/12, Republic of Ireland, WT098051, Wellcome Sanger Institute, 72160007, Comisión Nacional de Investigación Científica y Tecnológica, Children's Hospital of Philadelphia, Technische Universität Kaiserslautern, 1DH1813319, Dietmar Hopp Stiftung, National Institute for Health Research, Department of Health & Social Care, Service de neurologie 1 [CHU Pitié-Salpétrière], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Sorbonne Université (SU), Hôpital Saint Vincent de Paul-GHICL, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Technische Universität Munchen - Université Technique de Munich [Munich, Allemagne] (TUM)-Helmholtz-Zentrum München (HZM)-German Research Center for Environmental Health, Service de Génétique Cytogénétique et Embryologie [CHU Pitié-Salpêtrière], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Università degli Studi di Camerino (UNICAM), University of Oxford [Oxford], Institut National de la Santé et de la Recherche Médicale (INSERM)-Aix Marseille Université (AMU), Nottingham University Hospitals NHS Trust, Nottingham University Hospitals, SW Thames Regional Genetics Service, St Georgeâ™s University of London, London, University Hospital of Wales, Grenoble Ecole de Management, Royal Devon and Exeter Hospital, City Hospital Campus [Nottingham, UK]-Nottingham University Hospitals NHS Trust [UK], ANS - Complex Trait Genetics, Human Genetics, ARD - Amsterdam Reproduction and Development, ACS - Pulmonary hypertension & thrombosis, Service de Neurologie [CHU Pitié-Salpêtrière], IFR70-CHU Pitié-Salpêtrière [AP-HP], GHICL-Hôpital Saint Vincent de Paul, Centre National de la Recherche Scientifique (CNRS)-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université Friedrich-Alexander d'Erlangen-Nuremberg, Assistance publique - Hôpitaux de Paris (AP-HP) (APHP)-CHU Pitié-Salpêtrière [APHP], Centre Hospitalier Bretagne Atlantique [Vannes], Technische Universität München [München] (TUM)-Helmholtz-Zentrum München (HZM)-German Research Center for Environmental Health, Service de Génétique et Cytogénétique [CHU Pitié-Salpêtrière], University of Zürich [Zürich] (UZH), Università di Camerino (UNICAM), Birmingham Women's Hospital Healthcare NHS Trust, University Hospitals of Leicester, Sheffield Children’s Hospital, Weizmann Institute of Science, and Grenoble Ecole de Management (GEM)
Subjects: 0301 basic medicine, Male, Microcephaly, [SDV]Life Sciences [q-bio], Haploinsufficiency, autism, epilepsy, epileptic encephalopathy, global developmental delay, H3K4 methylation, intellectual disability, KMT2E, neurodevelopmental disorder, Adolescent, Adult, Child, Child, Preschool, DNA-Binding Proteins, Epilepsy, Female, Humans, Infant, Neurodevelopmental Disorders, Pedigree, Phenotype, Young Adult, Genetic Variation, Heterozygote, 0302 clinical medicine, Neurodevelopmental disorder, Intellectual disability, Global developmental delay, Genetics (clinical), ComputingMilieux_MISCELLANEOUS, Genetics, 0303 health sciences, Hypotonia, 030220 oncology & carcinogenesis, medicine.symptom, Rare cancers Radboud Institute for Health Sciences [Radboudumc 9], 03 medical and health sciences, Report, medicine, Journal Article, Expressivity (genetics), Preschool, 030304 developmental biology, [SDV.GEN]Life Sciences [q-bio]/Genetics, business.industry, Macrocephaly, medicine.disease, 030104 developmental biology, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, Autism, business, 030217 neurology & neurosurgery
Abstract: Contains fulltext : 206572.pdf (Publisher’s version ) (Open Access) We delineate a KMT2E-related neurodevelopmental disorder on the basis of 38 individuals in 36 families. This study includes 31 distinct heterozygous variants in KMT2E (28 ascertained from Matchmaker Exchange and three previously reported), and four individuals with chromosome 7q22.2-22.23 microdeletions encompassing KMT2E (one previously reported). Almost all variants occurred de novo, and most were truncating. Most affected individuals with protein-truncating variants presented with mild intellectual disability. One-quarter of individuals met criteria for autism. Additional common features include macrocephaly, hypotonia, functional gastrointestinal abnormalities, and a subtle facial gestalt. Epilepsy was present in about one-fifth of individuals with truncating variants and was responsive to treatment with anti-epileptic medications in almost all. More than 70% of the individuals were male, and expressivity was variable by sex; epilepsy was more common in females and autism more common in males. The four individuals with microdeletions encompassing KMT2E generally presented similarly to those with truncating variants, but the degree of developmental delay was greater. The group of four individuals with missense variants in KMT2E presented with the most severe developmental delays. Epilepsy was present in all individuals with missense variants, often manifesting as treatment-resistant infantile epileptic encephalopathy. Microcephaly was also common in this group. Haploinsufficiency versus gain-of-function or dominant-negative effects specific to these missense variants in KMT2E might explain this divergence in phenotype, but requires independent validation. Disruptive variants in KMT2E are an under-recognized cause of neurodevelopmental abnormalities.
Published: 2019

35. Inclusion of hemimegalencephaly into the phenotypic spectrum of <scp>NPRL</scp> 3 pathogenic variants in familial focal epilepsy with variable foci

Author: Christina Canavati, Zaid Afawi, Manuela Pendziwiat, Karl Martin Klein, Lara Kamal, Ikram Qaysia, Ingo Helbig, Fouad Zahdeh, Moien Kanaan, and Amal Abu Rayyan
Subjects: Adult, Male, 0301 basic medicine, Hemimegalencephaly, Adolescent, Genotype, Developmental Disabilities, Epilepsy, Frontal Lobe, Biology, Polymorphism, Single Nucleotide, 03 medical and health sciences, Exon, Epilepsy, 0302 clinical medicine, Proto-Oncogene Proteins, medicine, Humans, Exome, Family, Age of Onset, Child, Gene, Genetics, GTPase-Activating Proteins, Genetic Variation, Infant, Membrane Proteins, NPRL3 Gene, NPRL3, medicine.disease, Phenotype, Megalencephaly, Pedigree, 030104 developmental biology, Neurology, Child, Preschool, Female, Epilepsies, Partial, Neurology (clinical), Apoptosis Regulatory Proteins, Gene Deletion, 030217 neurology & neurosurgery
Abstract: Despite tremendous progress through next generation sequencing technologies, familial focal epilepsies are insufficiently understood. We sought to identify the genetic basis in multiplex Palestinian families with familial focal epilepsy with variable foci (FFEVF). Family I with 10 affected individuals and Family II with five affected individuals underwent detailed phenotyping over three generations. The phenotypic spectrum of the two families varied from nonlesional focal epilepsy including nocturnal frontal lobe epilepsy to severe structural epilepsy due to hemimegalencephaly. Whole-exome sequencing and single nucleotide polymorphism array analysis revealed pathogenic variants in NPRL3 in each family, a partial ~38-kb deletion encompassing eight exons (exons 8-15) and the 3'-untranslated region of the NPRL3 gene in Family I, and a de novo nonsense variant c.1063C>T, p.Gln355* in Family II. Furthermore, we identified a truncating variant in the PDCD10 gene in addition to the NPRL3 variant in a patient with focal epilepsy from Family I. The individual also had developmental delay and multiple cerebral cavernomas, possibly demonstrating a digenic contribution to the individual's phenotype. Our results implicate the association of NPRL3 with hemimegalencephaly, expanding the phenotypic spectrum of NPRL3 in FFEVF and underlining that partial deletions are part of the genotypic spectrum of NPRL3 variants.
Published: 2019

36. Intronic ATTTC repeat expansions in STARD7 in familial adult myoclonic epilepsy linked to chromosome 2

Author: Marina A. J. Tijssen, Mark A. Corbett, Zaid Afawi, Paolo Tinuper, Shoji Tsuji, Rachel Straussberg, Ilan Blatt, Samuel F. Berkovic, Francesco Brancati, Amy L Schneider, Lynette G. Sadleir, Sanjay M. Sisodiya, Renzo Guerrini, Shreyasee Chakraborty, Alfredo Berardelli, Silvana Franceschetti, Jozef Gecz, Luciano Xumerle, Pierre Labauge, Liana Veneziano, Simona Balestrini, Ingo Helbig, Martin A. Smith, Laura Canafoglia, Carlo Di Bonaventura, Hiroyuki Ishiura, Boris Keren, Manuela Pendziwiat, Rahel T. Florian, Sylvie Forlani, Anne Fleur van Rootselaar, Giorgio Casari, Christel Depienne, Tommaso Pippucci, Douglas E. Crompton, Edouard Hirsch, Davide Mei, Laura Licchetta, Renee Carroll, Riaan van Coller, Ingrid E. Scheffer, Thessa Kroes, Pasquale Striano, Brigid M. Regan, Francesca Bisulli, Shaun Carswell, Antonio Suppa, Julien Buratti, Karl Martin Klein, Alison Gardner, Caroline Nava, Federico Zara, Melanie Bahlo, Sabine Kaya, Kathryn Friend, Antonietta Coppola, Massimo Delledonne, Aaron M. Wenger, Anthony Correll, Sara Baldassari, Arn M. J. M. van den Maagdenberg, Eric LeGuern, Rachael Catford, Gabrielle Rudolf, Salvatore Striano, Mark F. Bennett, Josemir W. Sander, Kirston Barton, Michele Iacomino, Corbett M.A., Kroes T., Veneziano L., Bennett M.F., Florian R., Schneider A.L., Coppola A., Licchetta L., Franceschetti S., Suppa A., Wenger A., Mei D., Pendziwiat M., Kaya S., Delledonne M., Straussberg R., Xumerle L., Regan B., Crompton D., van Rootselaar A.-F., Correll A., Catford R., Bisulli F., Chakraborty S., Baldassari S., Tinuper P., Barton K., Carswell S., Smith M., Berardelli A., Carroll R., Gardner A., Friend K.L., Blatt I., Iacomino M., Di Bonaventura C., Striano S., Buratti J., Keren B., Nava C., Forlani S., Rudolf G., Hirsch E., Leguern E., Labauge P., Balestrini S., Sander J.W., Afawi Z., Helbig I., Ishiura H., Tsuji S., Sisodiya S.M., Casari G., Sadleir L.G., van Coller R., Tijssen M.A.J., Klein K.M., van den Maagdenberg A.M.J.M., Zara F., Guerrini R., Berkovic S.F., Pippucci T., Canafoglia L., Bahlo M., Striano P., Scheffer I.E., Brancati F., Depienne C., Gecz J., Neurology, ANS - Brain Imaging, Movement Disorder (MD), Corbett, M. A., Kroes, T., Veneziano, L., Bennett, M. F., Florian, R., Schneider, A. L., Coppola, A., Licchetta, L., Franceschetti, S., Suppa, A., Wenger, A., Mei, D., Pendziwiat, M., Kaya, S., Delledonne, M., Straussberg, R., Xumerle, L., Regan, B., Crompton, D., van Rootselaar, A. -F., Correll, A., Catford, R., Bisulli, F., Chakraborty, S., Baldassari, S., Tinuper, P., Barton, K., Carswell, S., Smith, M., Berardelli, A., Carroll, R., Gardner, A., Friend, K. L., Blatt, I., Iacomino, M., Di Bonaventura, C., Striano, S., Buratti, J., Keren, B., Nava, C., Forlani, S., Rudolf, G., Hirsch, E., Leguern, E., Labauge, P., Balestrini, S., Sander, J. W., Afawi, Z., Helbig, I., Ishiura, H., Tsuji, S., Sisodiya, S. M., Casari, G., Sadleir, L. G., van Coller, R., Tijssen, M. A. J., Klein, K. M., van den Maagdenberg, A. M. J. M., Zara, F., Guerrini, R., Berkovic, S. F., Pippucci, T., Canafoglia, L., Bahlo, M., Striano, P., Scheffer, I. E., Brancati, F., Depienne, C., and Gecz, J.
Subjects: 0301 basic medicine, Male, Myoclonus, Medizin, General Physics and Astronomy, Epilepsies, Myoclonic, Epilepsies, Intronic variant, repeat expansions,STARD7, familial adult myoclonic epilepsy, chromosome 2, Epilepsy, 0302 clinical medicine, DOMINANT CORTICAL TREMOR, EXPRESSION ANALYSIS, PEDIGREE, LOCUS, LINKAGE, GENE, 2P11.1-Q12.2, REFINEMENT, MUTATION, BAFME, lcsh:Science, Child, Genetics, Multidisciplinary, DNA Repeat Expansion, Disease genetics, Chromosome Mapping, Middle Aged, Pedigree, Myoclonic Epilepsy, Child, Preschool, Chromosomes, Human, Pair 2, Pair 2, STARD7, Female, Adolescent, Adult, Carrier Proteins, Humans, Young Adult, Introns, Human, Science, Locus (genetics), Biology, Chromosomes, General Biochemistry, Genetics and Molecular Biology, Article, 03 medical and health sciences, medicine, Preschool, Gene, Whole genome sequencing, Intron, Chromosome, General Chemistry, medicine.disease, 030104 developmental biology, Microsatellite instability, Myoclonic epilepsy, lcsh:Q, Familial Adult Myoclonic Epilepsy, Myoclonic, Carrier Protein, 030217 neurology & neurosurgery, Neurological disorders
Abstract: Familial Adult Myoclonic Epilepsy (FAME) is characterised by cortical myoclonic tremor usually from the second decade of life and overt myoclonic or generalised tonic-clonic seizures. Four independent loci have been implicated in FAME on chromosomes (chr) 2, 3, 5 and 8. Using whole genome sequencing and repeat primed PCR, we provide evidence that chr2-linked FAME (FAME2) is caused by an expansion of an ATTTC pentamer within the first intron of STARD7. The ATTTC expansions segregate in 158/158 individuals typically affected by FAME from 22 pedigrees including 16 previously reported families recruited worldwide. RNA sequencing from patient derived fibroblasts shows no accumulation of the AUUUU or AUUUC repeat sequences and STARD7 gene expression is not affected. These data, in combination with other genes bearing similar mutations that have been implicated in FAME, suggest ATTTC expansions may cause this disorder, irrespective of the genomic locus involved., Familial cortical myoclonic tremor (FAME) has so far been mapped to regions on chromosome 2, 3, 5 and 8 and pentameric repeat expansions in SAMD12 were identified as cause of FAME1. Here, Corbett et al. identify ATTTT/ATTTC repeat expansions in intron 1 of STARD7 in individuals with FAME2.”
Published: 2019

37. Ultra-Rare Genetic Variation in the Epilepsies: A Whole-Exome Sequencing Study of 17,606 Individuals

Author: Yen-Chen Anne Feng, Daniel P. Howrigan, Liam E. Abbott, Katherine Tashman, Felecia Cerrato, Tarjinder Singh, Henrike Heyne, Andrea Byrnes, Claire Churchhouse, Nick Watts, Matthew Solomonson, Dennis Lal, Erin L. Heinzen, Ryan S. Dhindsa, Kate E. Stanley, Gianpiero L. Cavalleri, Hakon Hakonarson, Ingo Helbig, Roland Krause, Patrick May, Sarah Weckhuysen, Slavé Petrovski, Sitharthan Kamalakaran, Sanjay M. Sisodiya, Patrick Cossette, Chris Cotsapas, Peter De Jonghe, Tracy Dixon-Salazar, Renzo Guerrini, Patrick Kwan, Anthony G. Marson, Randy Stewart, Chantal Depondt, Dennis J. Dlugos, Ingrid E. Scheffer, Pasquale Striano, Catharine Freyer, Kevin McKenna, Brigid M. Regan, Susannah T. Bellows, Costin Leu, Caitlin A. Bennett, Esther M.C. Johns, Alexandra Macdonald, Hannah Shilling, Rosemary Burgess, Dorien Weckhuysen, Melanie Bahlo, Terence J. O’Brien, Marian Todaro, Hannah Stamberger, Danielle M. Andrade, Tara R. Sadoway, Kelly Mo, Heinz Krestel, Sabina Gallati, Savvas S. Papacostas, Ioanna Kousiappa, George A. Tanteles, Katalin Štěrbová, Markéta Vlčková, Lucie Sedláčková, Petra Laššuthová, Karl Martin Klein, Felix Rosenow, Philipp S. Reif, Susanne Knake, Wolfram S. Kunz, Gábor Zsurka, Christian E. Elger, Jürgen Bauer, Michael Rademacher, Manuela Pendziwiat, Hiltrud Muhle, Annika Rademacher, Andreas van Baalen, Sarah von Spiczak, Ulrich Stephani, Zaid Afawi, Amos D. Korczyn, Moien Kanaan, Christina Canavati, Gerhard Kurlemann, Karen Müller-Schlüter, Gerhard Kluger, Martin Häusler, Ilan Blatt, Johannes R. Lemke, Ilona Krey, Yvonne G. Weber, Stefan Wolking, Felicitas Becker, Christian Hengsbach, Sarah Rau, Ana F. Maisch, Bernhard J. Steinhoff, Andreas Schulze-Bonhage, Susanne Schubert-Bast, Herbert Schreiber, Ingo Borggräfe, Christoph J. Schankin, Thomas Mayer, Rudolf Korinthenberg, Knut Brockmann, Dieter Dennig, Rene Madeleyn, Reetta Kälviäinen, Pia Auvinen, Anni Saarela, Tarja Linnankivi, Anna-Elina Lehesjoki, Mark I. Rees, Seo-Kyung Chung, William O. Pickrell, Robert Powell, Natascha Schneider, Simona Balestrini, Sara Zagaglia, Vera Braatz, Michael R. Johnson, Pauls Auce, Graeme J. Sills, Larry W. Baum, Pak C. Sham, Stacey S. Cherny, Colin H.T. Lui, Nina Barišić, Norman Delanty, Colin P. Doherty, Arif Shukralla, Mark McCormack, Hany El-Naggar, Laura Canafoglia, Silvana Franceschetti, Barbara Castellotti, Tiziana Granata, Federico Zara, Michele Iacomino, Francesca Madia, Maria Stella Vari, Maria Margherita Mancardi, Vincenzo Salpietro, Francesca Bisulli, Paolo Tinuper, Laura Licchetta, Tommaso Pippucci, Carlotta Stipa, Raffaella Minardi, Antonio Gambardella, Angelo Labate, Grazia Annesi, Lorella Manna, Monica Gagliardi, Elena Parrini, Davide Mei, Annalisa Vetro, Claudia Bianchini, Martino Montomoli, Viola Doccini, Carla Marini, Toshimitsu Suzuki, Yushi Inoue, Kazuhiro Yamakawa, Birute Tumiene, Lynette G. Sadleir, Chontelle King, Emily Mountier, S. Hande Caglayan, Mutluay Arslan, Zuhal Yapıcı, Uluc Yis, Pınar Topaloglu, Bulent Kara, Dilsad Turkdogan, Aslı Gundogdu-Eken, Nerses Bebek, Sibel Uğur-İşeri, Betül Baykan, Barış Salman, Garen Haryanyan, Emrah Yücesan, Yeşim Kesim, Çiğdem Özkara, Annapurna Poduri, Beth R. Shiedley, Catherine Shain, Russell J. Buono, Thomas N. Ferraro, Michael R. Sperling, Warren Lo, Michael Privitera, Jacqueline A. French, Steven Schachter, Ruben I. Kuzniecky, Orrin Devinsky, Manu Hegde, Pouya Khankhanian, Katherine L. Helbig, Colin A. Ellis, Gianfranco Spalletta, Fabrizio Piras, Federica Piras, Tommaso Gili, Valentina Ciullo, Andreas Reif, Andrew McQuillin, Nick Bass, Andrew McIntosh, Douglas Blackwood, Mandy Johnstone, Aarno Palotie, Michele T. Pato, Carlos N. Pato, Evelyn J. Bromet, Celia Barreto Carvalho, Eric D. Achtyes, Maria Helena Azevedo, Roman Kotov, Douglas S. Lehrer, Dolores Malaspina, Stephen R. Marder, Helena Medeiros, Christopher P. Morley, Diana O. Perkins, Janet L. Sobell, Peter F. Buckley, Fabio Macciardi, Mark H. Rapaport, James A. Knowles, Ayman H. Fanous, Steven A. McCarroll, Namrata Gupta, Stacey B. Gabriel, Mark J. Daly, Eric S. Lander, Daniel H. Lowenstein, David B. Goldstein, Holger Lerche, Samuel F. Berkovic, Benjamin M. Neale, Wellcome Trust, Department of Health, Institute of Neurology, UCL, Imperial College Healthcare NHS Trust- BRC Funding, Commission of the European Communities, Medical Research Council (MRC), Feng Y.-C.A., Howrigan D.P., Abbott L.E., Tashman K., Cerrato F., Singh T., Heyne H., Byrnes A., Churchhouse C., Watts N., Solomonson M., Lal D., Heinzen E.L., Dhindsa R.S., Stanley K.E., Cavalleri G.L., Hakonarson H., Helbig I., Krause R., May P., Weckhuysen S., Petrovski S., Kamalakaran S., Sisodiya S.M., Cossette P., Cotsapas C., De Jonghe P., Dixon-Salazar T., Guerrini R., Kwan P., Marson A.G., Stewart R., Depondt C., Dlugos D.J., Scheffer I.E., Striano P., Freyer C., McKenna K., Regan B.M., Bellows S.T., Leu C., Bennett C.A., Johns E.M.C., Macdonald A., Shilling H., Burgess R., Weckhuysen D., Bahlo M., O'Brien T.J., Todaro M., Stamberger H., Andrade D.M., Sadoway T.R., Mo K., Krestel H., Gallati S., Papacostas S.S., Kousiappa I., Tanteles G.A., Sterbova K., Vlckova M., Sedlackova L., Lassuthova P., Klein K.M., Rosenow F., Reif P.S., Knake S., Kunz W.S., Zsurka G., Elger C.E., Bauer J., Rademacher M., Pendziwiat M., Muhle H., Rademacher A., van Baalen A., von Spiczak S., Stephani U., Afawi Z., Korczyn A.D., Kanaan M., Canavati C., Kurlemann G., Muller-Schluter K., Kluger G., Hausler M., Blatt I., Lemke J.R., Krey I., Weber Y.G., Wolking S., Becker F., Hengsbach C., Rau S., Maisch A.F., Steinhoff B.J., Schulze-Bonhage A., Schubert-Bast S., Schreiber H., Borggrafe I., Schankin C.J., Mayer T., Korinthenberg R., Brockmann K., Dennig D., Madeleyn R., Kalviainen R., Auvinen P., Saarela A., Linnankivi T., Lehesjoki A.-E., Rees M.I., Chung S.-K., Pickrell W.O., Powell R., Schneider N., Balestrini S., Zagaglia S., Braatz V., Johnson M.R., Auce P., Sills G.J., Baum L.W., Sham P.C., Cherny S.S., Lui C.H.T., Barisic N., Delanty N., Doherty C.P., Shukralla A., McCormack M., El-Naggar H., Canafoglia L., Franceschetti S., Castellotti B., Granata T., Zara F., Iacomino M., Madia F., Vari M.S., Mancardi M.M., Salpietro V., Bisulli F., Tinuper P., Licchetta L., Pippucci T., Stipa C., Minardi R., Gambardella A., Labate A., Annesi G., Manna L., Gagliardi M., Parrini E., Mei D., Vetro A., Bianchini C., Montomoli M., Doccini V., Marini C., Suzuki T., Inoue Y., Yamakawa K., Tumiene B., Sadleir L.G., King C., Mountier E., Caglayan S.H., Arslan M., Yapici Z., Yis U., Topaloglu P., Kara B., Turkdogan D., Gundogdu-Eken A., Bebek N., Ugur-Iseri S., Baykan B., Salman B., Haryanyan G., Yucesan E., Kesim Y., Ozkara C., Poduri A., Shiedley B.R., Shain C., Buono R.J., Ferraro T.N., Sperling M.R., Lo W., Privitera M., French J.A., Schachter S., Kuzniecky R.I., Devinsky O., Hegde M., Khankhanian P., Helbig K.L., Ellis C.A., Spalletta G., Piras F., Gili T., Ciullo V., Reif A., McQuillin A., Bass N., McIntosh A., Blackwood D., Johnstone M., Palotie A., Pato M.T., Pato C.N., Bromet E.J., Carvalho C.B., Achtyes E.D., Azevedo M.H., Kotov R., Lehrer D.S., Malaspina D., Marder S.R., Medeiros H., Morley C.P., Perkins D.O., Sobell J.L., Buckley P.F., Macciardi F., Rapaport M.H., Knowles J.A., Fanous A.H., McCarroll S.A., Gupta N., Gabriel S.B., Daly M.J., Lander E.S., Lowenstein D.H., Goldstein D.B., Lerche H., Berkovic S.F., Neale B.M., Epi25 Collaborative, YÜCESAN, EMRAH, Institute for Molecular Medicine Finland, Children's Hospital, HUS Children and Adolescents, Department of Medical and Clinical Genetics, University Management, Centre of Excellence in Complex Disease Genetics, Aarno Palotie / Principal Investigator, and Genomics of Neurological and Neuropsychiatric Disorders
Subjects: s.berkovic@unimelb.edu.au [Epi25 Collaborative. Electronic address], 0301 basic medicine, GAMMA-2-SUBUNIT, burden analysi, DNA Mutational Analysis, PROTEIN, Neurodegenerative, VARIANTS, SUSCEPTIBILITY, Medical and Health Sciences, Epilepsy, 0302 clinical medicine, 2.1 Biological and endogenous factors, EPIDEMIOLOGY, Missense mutation, Exome, Aetiology, Genetics (clinical), Exome sequencing, 11 Medical and Health Sciences, seizures, GABRG2, Genetics, Genetics & Heredity, 0303 health sciences, biology, COMMON EPILEPSIES, 1184 Genetics, developmental biology, physiology, sequencing, Biological Sciences, Epi25 Collaborative, Phenotype, GENOME, epileptic encephalopathy, burden analysis, Neurological, Biotechnology, Genetic Markers, seizure, EEF1A2, Burden analysis, epilepsy, exome, Article, 03 medical and health sciences, Clinical Research, Exome Sequencing, Genetic variation, medicine, Humans, Genetic Predisposition to Disease, Gene, EPILEPTIC SEIZURES, METAANALYSIS, 030304 developmental biology, Human Genome, Neurosciences, Genetic Variation, 06 Biological Sciences, medicine.disease, Brain Disorders, 030104 developmental biology, Genetic marker, DE-NOVO MUTATIONS, Case-Control Studies, biology.protein, 3111 Biomedicine, Human medicine, 030217 neurology & neurosurgery
Abstract: Sequencing-based studies have identified novel risk genes for rare, severe epilepsies and revealed a role of rare deleterious variation in common epilepsies. To identify the shared and distinct ultra-rare genetic risk factors for rare and common epilepsies, we performed a whole-exome sequencing (WES) analysis of 9,170 epilepsy-affected individuals and 8,364 controls of European ancestry. We focused on three phenotypic groups; the rare but severe developmental and epileptic encephalopathies (DEE), and the commoner phenotypes of genetic generalized epilepsy (GGE) and non-acquired focal epilepsy (NAFE). We observed that compared to controls, individuals with any type of epilepsy carried an excess of ultra-rare, deleterious variants in constrained genes and in genes previously associated with epilepsy, with the strongest enrichment seen in DEE and the least in NAFE. Moreover, we found that inhibitory GABAA receptor genes were enriched for missense variants across all three classes of epilepsy, while no enrichment was seen in excitatory receptor genes. The larger gene groups for the GABAergic pathway or cation channels also showed a significant mutational burden in DEE and GGE. Although no single gene surpassed exome-wide significance among individuals with GGE or NAFE, highly constrained genes and genes encoding ion channels were among the top associations, including CACNA1G, EEF1A2, and GABRG2 for GGE and LGI1, TRIM3, and GABRG2 for NAFE. Our study confirms a convergence in the genetics of common and rare epilepsies associated with ultra-rare coding variation and highlights a ubiquitous role for GABAergic inhibition in epilepsy etiology in the largest epilepsy WES study to date.
Published: 2019

38. Genome-wide association study in essential tremor identifies three new loci

Author: Michel Panisset, Günther Deuschl, Patrick A. Dion, Lukas Tittmann, Mark Hallett, Claudia M. Testa, Simon Girard, Zbigniew K. Wszolek, Karin Srulijes, Klaus Seppi, Susanne A. Schneider, Gregor Kuhlenbäumer, Nancy D. Merner, Juliane Winkelmann, Wolfgang Lieb, Manuela Pendziwiat, Dietrich Haubenberger, Oswaldo Lorenzo-Betancor, Franziska Hopfner, Ronald B. Postuma, Kirsten E. Zeuner, Geneviève Bernard, Sylvain Chouinard, Guy A. Rouleau, Elan D. Louis, Owen A. Ross, Eva Reischl, Thomas Arzberger, Daniela Berg, Stefanie H. Müller, Sara Ortega-Cubero, Cynthia V. Bourassa, Joshua M. Shulman, Ali H. Rajput, Alexandra I. Soto-Ortolaza, Stephan Klebe, Nicolas Dupré, Isabel Wurster, Pau Pastor, Anna Hussl, Konstantin Strauch, Karl-Heinz Ladwig, Colin A. Hodgkinson, Joseph Jankovic, Delia Lorenz, Werner Poewe, Lorraine N. Clark, Alex Rajput, and Carles Vilariño-Güell
Subjects: 0301 basic medicine, Essential Tremor, PPARGC1A protein, human, genetics [Protein Serine-Threonine Kinases], Genome-wide association study, Single-nucleotide polymorphism, Protein Serine-Threonine Kinases, Biology, Bioinformatics, genetics [Protein-Serine-Threonine Kinases], Polymorphism, Single Nucleotide, STK32B protein, human, 03 medical and health sciences, 0302 clinical medicine, genetics [Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha], medicine, Humans, genome-wide association study, movement disorders, tremor, genetics, essential tremor, ddc:610, Kinetic tremor, LINGO1, CTNNA3 protein, human, Genetic association, Genetics, Essential tremor, Protein-Serine-Threonine Kinases, medicine.disease, Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha, 030104 developmental biology, genetics [Essential Tremor], Cerebellar cortex, Expression quantitative trait loci, genetics [alpha Catenin], Neurology (clinical), alpha Catenin, 030217 neurology & neurosurgery, Genome-Wide Association Study
Abstract: We conducted a genome-wide association study of essential tremor, a common movement disorder characterized mainly by a postural and kinetic tremor of the upper extremities. Twin and family history studies show a high heritability for essential tremor. The molecular genetic determinants of essential tremor are unknown. We included 2807 patients and 6441 controls of European descent in our two-stage genome-wide association study. The 59 most significantly disease-associated markers of the discovery stage were genotyped in the replication stage. After Bonferroni correction two markers, one (rs10937625) located in the serine/threonine kinase STK32B and one (rs17590046) in the transcriptional coactivator PPARGC1A were associated with essential tremor. Three markers (rs12764057, rs10822974, rs7903491) in the cell-adhesion molecule CTNNA3 were significant in the combined analysis of both stages. The expression of STK32B was increased in the cerebellar cortex of patients and expression quantitative trait loci database mining showed association between the protective minor allele of rs10937625 and reduced expression in cerebellar cortex. We found no expression differences related to disease status or marker genotype for the other two genes. Replication of two lead single nucleotide polymorphisms of previous small genome-wide association studies (rs3794087 in SLC1A2, rs9652490 in LINGO1) did not confirm the association with essential tremor.
Published: 2016

39. Seizures as presenting and prominent symptom in chorea-acanthocytosis with c.2343delVPS13Agene mutation

Author: Samuel F. Berkovic, Manuela Pendziwiat, Ilan Blatt, Karen Oliver, Ingo Helbig, Amos D. Korczyn, Felix Benninger, Akira Sano, Masayuki Nakamura, and Zaid Afawi
Subjects: Adult, Male, 0301 basic medicine, Pediatrics, medicine.medical_specialty, Pathology, Movement disorders, Adolescent, Tics, Vesicular Transport Proteins, Electroencephalography, Gene mutation, Diagnosis, Differential, Young Adult, 03 medical and health sciences, Epilepsy, 0302 clinical medicine, Seizures, Neuroacanthocytosis, medicine, Humans, Cognitive decline, Chorea acanthocytosis, medicine.diagnostic_test, business.industry, medicine.disease, Magnetic Resonance Imaging, Pedigree, 030104 developmental biology, Neurology, Mutation, Female, Neurology (clinical), medicine.symptom, business, 030217 neurology & neurosurgery
Abstract: Objective The aim of the study was to characterize the clinical features of nine patients in three families with chorea-acanthocytosis (ChAc) sharing the same rare c.2343del mutation in the VPS13A gene. Methods Genetic test results, clinical description, magnetic resonance imaging (MRI), and electroencephalography (EEG), as well as laboratory results are summarized. Results ChAc is a rare genetic disorder characterized by hyperkinetic movements, seizures, cognitive decline, neuropsychiatric symptoms, and acanthocytes on peripheral blood smear. This unique cohort of nine patients is characterized by seizures as a first and prominent symptom. In our patients, other features of ChAc appeared later, including tics, other movement disorders, dysarthria, and mild to moderate cognitive decline. Significance Patients with chorea-acanthocytosis carrying the described rare mutation can present with focal, treatment-resistant seizures.
Published: 2016

40. Hereditary neuralgic amyotrophy in childhood caused by duplication within the SEPT9 gene: A family study

Author: Doris Boeckelmann, Julia Kracht, Barbara Zieger, Katharina Neubauer, Janbernd Kirschner, Manuela Pendziwiat, and Udo Koehler
Subjects: Male, Heterozygote, Adolescent, Platelet Aggregation, early onset, Hereditary neuralgic amyotrophy, Biology, Kidney cysts, 03 medical and health sciences, Exon, 0302 clinical medicine, Structural Biology, Gene Duplication, Gene duplication, medicine, septins, Brachial Plexus Neuritis, Humans, Platelet, Child, Gene, Research Articles, 030304 developmental biology, 0303 health sciences, Cell Biology, Exons, medicine.disease, Flow Cytometry, hereditary neuralgic amyotrophy, Molecular analysis, Child, Preschool, Immunology, Mutation, pain attack, Female, medicine.symptom, Brachial plexus, septin 9, 030217 neurology & neurosurgery, Research Article
Abstract: Hereditary neuralgic amyotrophy (HNA) is an autosomal dominant disorder associated with episodic, recurrent, and painful neuropathies affecting the nerves of the brachial plexus. In this study, we report on a family of Lebanese descent with HNA onset in early childhood. The affected family members presented with platelet dysfunction. Platelet aggregation was reduced after stimulation with the agonists ADP and epinephrine in all affected family members. Flow cytometric analyses revealed impaired platelet δ‐secretion. The index patient and one brother suffered from kidney cysts. Molecular genetic analysis revealed a heterozygous duplication of exon 2 within the septin 9 (SEPT9) gene in all the affected family members. Such a young child with HNA (aged 2 years) caused by SEPT9 duplication has not been described so far.
Published: 2018

41. Characterization of glycosylphosphatidylinositol biosynthesis defects by clinical features, flow cytometry, and automated image analysis

Author: Tzung-Chien Hsieh, Yaron Gurovich, Helenius Jurgen Schelhaas, Natasha J Brown, Peter Krawitz, Ingo Helbig, Ewa Obersztyn, Denise Horn, Max Schubach, Stefan Mundlos, Nicolas Chassaing, Yvonne G. Weber, Sebastian Koehler, Alexej Knaus, Hiltrud Muhle, Steven A. Skinner, Patrick Calvas, Peter N. Robinson, Max Zhao, Christian Korff, Nurulhuda Hajjir, Nicole Fleischer, Manuela Pendziwiat, Myrthe van den Born, Hannah Warren, Agnieszka Charzewska, Marten Jäger, Milda Endziniene, Raymond J. Louie, Marc Bohn, Fanny Kortuem, Jean Tori Pantel, Christina Evers, Hans Jürgen Christen, Allan Bayat, Rikke S. Møller, Charité - UniversitätsMedizin = Charité - University Hospital [Berlin], Max Planck Institute for Molecular Genetics (MPIMG), Max-Planck-Gesellschaft, University Hospital Bonn, Rheinische Friedrich-Wilhelms-Universität Bonn, University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein (UKSH), Kiel University, Berlin Institute of Health (BIH), FDNA Inc, Université de Genève (UNIGE), Danish Epilepsy Centre, Denmark and Aarhus University, Aarhus, University of Southern Denmark (SDU), University Hospital of Copenhagen, Hvidovre Hospital, Unité différenciation épidermique et auto-immunité rhumatoïde (UDEAR), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National de la Santé et de la Recherche Médicale (INSERM), The Greenwood Genetic Center, UniversitätsKlinikum Heidelberg, St. Bernward-Krankenhaus, Erasmus University Medical Center [Rotterdam] (Erasmus MC), Institute of Mother and Child, Lithuanian University of Health Sciences [Kaunas, Lithuania], Universitaetsklinikum Hamburg-Eppendorf = University Medical Center Hamburg-Eppendorf [Hamburg] (UKE), Royal Children's Hospital, Austin Health, Academic Center for Epileptology Kempenhaeghe & Maastricht UMC+ [Heeze], University of Tübingen, Children’s Hospital of Philadelphia (CHOP ), German Ministry of Research and Education German Research Foundation, and Clinical Genetics
Subjects: 0301 basic medicine, MESH: Abnormalities, Multiple / metabolism, Glycosylphosphatidylinositols, lcsh:Medicine, Biomarkers/metabolism, Bioinformatics, Gene, Correlation, Automation, 0302 clinical medicine, MESH: Automation, [SDV.MHEP.MI]Life Sciences [q-bio]/Human health and pathology/Infectious diseases, Intellectual disability, Image Processing, Computer-Assisted, MESH: Syndrome, Genetics (clinical), Genetics, 0303 health sciences, ddc:618, medicine.diagnostic_test, MESH: Flow Cytometry / methods, Phosphorus Metabolism Disorders/metabolism, Phosphorus Metabolism Disorders, Syndrome, Flow Cytometry, MESH: Phosphorus Metabolism Disorders / metabolism, MESH: Image Processing, Computer-Assisted, Phenotype, Pathophysiology, Hypotonia, MESH: Glycosylphosphatidylinositols / biosynthesis, MESH: Intellectual Disability / metabolism, Molecular Medicine, Alkaline phosphatase, medicine.symptom, Prediction, lcsh:QH426-470, Glycosylphosphatidylinositols/biosynthesis, Anchor biosynthesis defects, Intellectual Disability/metabolism, Biology, MESH: Phenotype, Flow cytometry, Automated image analysis, 03 medical and health sciences, Intellectual Disability, medicine, Humans, Abnormalities, Multiple, Molecular Biology, 030304 developmental biology, MESH: Humans, Research, lcsh:R, medicine.disease, Flow Cytometry/methods, Human genetics, Abnormalities, Multiple/metabolism, lcsh:Genetics, MESH: Biomarkers / metabolism, 030104 developmental biology, GPI, Biomarkers, 030217 neurology & neurosurgery
Abstract: BackgroundGlycosylphosphatidylinositol Biosynthesis Defects (GPIBDs) cause a group of phenotypically overlapping recessive syndromes with intellectual disability, for which pathogenic mutations have been described in 16 genes of the corresponding molecular pathway. An elevated serum activity of alkaline phosphatase (AP), a GPI-linked enzyme, has been used to assign GPIBDs to the phenotypic series of Hyperphosphatasia with Mental Retardation Syndrome (HPMRS) and to distinguish them from another subset of GPIBDs, termed Multiple Congenital Anomalies Hypotonia Seizures syndrome (MCAHS). However, the increasing number of individuals with a GPIBD shows that hyperphosphatasia is a variable feature that is not ideal for a clinical classification.MethodsWe studied the discriminatory power of multiple GPI-linked substrates that were assessed by flow cytometry in blood cells and fibroblasts of 39 and 14 individuals with a GPIBD, respectively. On the phenotypic level, we evaluated the frequency of occurrence of clinical symptoms and analyzed the performance of computer-assisted image analysis of the facial gestalt in 91 individuals.ResultsWe found that certain malformations such as Morbus Hirschsprung and Diaphragmatic defects are more likely to be associated with particular gene defects (PIGV, PGAP3, PIGN). However, especially at the severe end of the clinical spectrum of HPMRS, there is a high phenotypic overlap with MCAHS. Elevation of AP has also been documented in some of the individuals with MCAHS, namely those with PIGA mutations. Although the impairment of GPI-linked substrates is supposed to play the key role in the pathophysiology of GPIBDs, we could not observe gene-specific profiles for flow cytometric markers or a correlation between their cell surface levels and the severity of the phenotype. In contrast, it was facial recognition software that achieved the highest accuracy in predicting the disease-causing gene in a GPIBD.ConclusionsDue to the overlapping clinical spectrum of both, HPMRS and MCAHS, in the majority of affected individuals, the elevation of AP and the reduced surface levels of GPI-linked markers in both groups, a common classification as GPIBDs is recommended. The effectiveness of computer-assisted gestalt analysis for the correct gene inference in a GPIBD and probably beyond is remarkable and illustrates how the information contained in human faces is pivotal in the delineation of genetic entities.
Published: 2018

42. Defining the phenotypic spectrum of SLC6A1 mutations

Author: Elena Gardella, Diane Doummar, Orrin Devinsky, Nicola Specchio, Holly Dubbs, Lance H. Rodan, Caroline Nava, Elise Schaefer, Jessica E. Shaw, Desiree Czapansky-Beilman, Tarja Linnankivi, Rikke S. Møller, Helenius J. Schelhaas, Kathrine L. Helbig, Jakob Christensen, Jamel Chelly, Gemma L. Carvill, Sarah E. Hopkins, Sara Chadwick Reichert, Marina Trivisano, Amélie Piton, Candace T. Myers, Pasquale Striano, Katrine M Johannesen, Alexandra Afenjar, Judith S. Verhoeven, John Millichap, Yongjin Yoo, Oriano Mecarelli, Murim Choi, Jong Hee Chae, Joseph G. Gleeson, Heather C Mefford, Gaetan Lesca, Laura Pisani, Boris Keren, Sha Tang, Marie Thérèse Abi-Warde, Carolina Courage, Ingo Helbig, Deb K. Pal, Guido Rubboli, Lynne M. Bird, Manuela Pendziwiat, Cyril Mignot, Shan Tang, J. Lawrence Merritt, Yvonne G. Weber, Anna-Elina Lehesjoki, Wen-Hann Tan, Anne de Saint Martin, Mark Nespeca, University of Southern Denmark (SDU), CHU Strasbourg, Sorbonne Université - Faculté de Médecine (SU FM), Sorbonne Université (SU), CHU Trousseau [APHP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon, Centre de recherche en neurosciences de Lyon (CRNL), Université de Lyon-Université de Lyon-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), Université de Strasbourg (UNISTRA)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Diagnostic Génétique [CHU Strasbourg], Université de Strasbourg (UNISTRA)-CHU Strasbourg, Boston Children's Hospital, Seoul National University [Seoul] (SNU), Service de Génétique Cytogénétique et Embryologie [CHU Pitié-Salpêtrière], CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Institut du Cerveau et de la Moëlle Epinière = Brain and Spine Institute (ICM), Institut National de la Santé et de la Recherche Médicale (INSERM)-CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Service de Neuropédiatrie [CHU Trousseau], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-CHU Trousseau [APHP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Sorbonne Université (SU), University of Genoa (UNIGE), and Children’s Hospital of Philadelphia (CHOP )
Subjects: Male, 0301 basic medicine, Pediatrics, Epilepsies, Myoclonic, Epilepsies, Neurodegenerative, Epilepsies, Myoclonic/complications, Intellectual Disability/complications, Cohort Studies, Epilepsy, 0302 clinical medicine, 2.1 Biological and endogenous factors, Neurodevelopmental Disorders/complications, Aetiology, Valproic Acid/therapeutic use, Child, Atonic seizure, Ataxia/complications, Seizure types, Anticonvulsants/therapeutic use, Electroencephalography, MAE, Language Development Disorders/complications, Phenotype, Treatment Outcome, Neurology, Child, Preschool, Neurological, Speech delay, Anticonvulsants, Epilepsy, Generalized, Female, medicine.symptom, Partial, Adult, GABA Plasma Membrane Transport Proteins, medicine.medical_specialty, SLC6A1, epilepsy, epilepsy genetics, Adolescent, Epilepsies, Partial/complications, Epilepsy, Generalized/complications, Clinical Sciences, Mutation, Missense, GABA Plasma Membrane Transport Proteins/genetics, Status epilepticus, Article, Young Adult, 03 medical and health sciences, Childhood absence epilepsy, Clinical Research, Intellectual Disability, Behavioral and Social Science, Genetics, medicine, Humans, Language Development Disorders, Generalized epilepsy, Preschool, Genetic Association Studies, Neurology & Neurosurgery, Generalized, business.industry, Valproic Acid, Neurosciences, medicine.disease, Brain Disorders, 030104 developmental biology, Myoclonic astatic epilepsy, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, Neurodevelopmental Disorders, Mutation, Ataxia, Epilepsies, Partial, Neurology (clinical), Missense, Myoclonic, business, 030217 neurology & neurosurgery
Abstract: OBJECTIVE: Pathogenic SLC6A1 variants were recently described in patients with myoclonic atonic epilepsy (MAE) and intellectual disability (ID). We set out to define the phenotypic spectrum in a larger cohort of SCL6A1-mutated patients.METHODS: We collected 24 SLC6A1 probands and 6 affected family members. Four previously published cases were included for further electroclinical description. In total, we reviewed the electroclinical data of 34 subjects.RESULTS: Cognitive development was impaired in 33/34 (97%) subjects; 28/34 had mild to moderate ID, with language impairment being the most common feature. Epilepsy was diagnosed in 31/34 cases with mean onset at 3.7 years. Cognitive assessment before epilepsy onset was available in 24/31 subjects and was normal in 25% (6/24), and consistent with mild ID in 46% (11/24) or moderate ID in 17% (4/24). Two patients had speech delay only, and 1 had severe ID. After epilepsy onset, cognition deteriorated in 46% (11/24) of cases. The most common seizure types were absence, myoclonic, and atonic seizures. Sixteen cases fulfilled the diagnostic criteria for MAE. Seven further patients had different forms of generalized epilepsy and 2 had focal epilepsy. Twenty of 31 patients became seizure-free, with valproic acid being the most effective drug. There was no clear-cut correlation between seizure control and cognitive outcome. Electroencephalography (EEG) findings were available in 27/31 patients showing irregular bursts of diffuse 2.5-3.5 Hz spikes/polyspikes-and-slow waves in 25/31. Two patients developed an EEG pattern resembling electrical status epilepticus during sleep. Ataxia was observed in 7/34 cases. We describe 7 truncating and 18 missense variants, including 4 recurrent variants (Gly232Val, Ala288Val, Val342Met, and Gly362Arg).SIGNIFICANCE: Most patients carrying pathogenic SLC6A1 variants have an MAE phenotype with language delay and mild/moderate ID before epilepsy onset. However, ID alone or associated with focal epilepsy can also be observed.
Published: 2018

43. Autosomal dominant epilepsy with auditory features: a new LGI1 family including a phenocopy with cortical dysplasia

Author: Zaid Afawi, Bobby P. C. Koeleman, Ronel Veksler, Ingo Helbig, Gregor Kuhlenbäumer, Alon Friedman, Silke Appenzeller, Rony Cohen, Liron Sheintuch, Karl Martin Klein, Manuela Pendziwiat, Felix Rosenow, and Carolien G.F. de Kovel
Subjects: Male, 0301 basic medicine, Proband, Genetic Linkage, Epilepsy, Frontal Lobe, Epilepsies, Iran, Epilepsy, 0302 clinical medicine, Israel, Non-U.S. Gov't, Child, partial [C10.228.140.490.360], Exome sequencing, Autosomal dominant epilepsy with auditory features, Aged, 80 and over, Genetics, Research Support, Non-U.S. Gov't, Intracellular Signaling Peptides and Proteins, Genetic research [C10.228.140.490.360], Electroencephalography, Exons, Middle Aged, Magnetic Resonance Imaging, Pedigree, Malformations of Cortical Development, Phenotype, Neurology, Mutation (genetic algorithm), Female, LGI1 protein, human [T329500], Adult, Sleep Wake Disorders, Clinical Neurology, Autosomal dominant lateral temporal lobe epilepsy, Biology, Research Support, Young Adult, 03 medical and health sciences, Epilepsies, partial [C10.228.140.490.360], Genetic linkage, Journal Article, medicine, Humans, Aged, Phenocopy, Proteins, Sequence Analysis, DNA, Cortical dysplasia, medicine.disease, LGI1 protein, Reelin Protein, human [T329500], 030104 developmental biology, Jews, Mutation, Epilepsy syndromes, Autosomal dominant partial epilepsy with auditory features, Neurology (clinical), 030217 neurology & neurosurgery
Abstract: We report a new family with autosomal dominant epilepsy with auditory features (ADEAF) including focal cortical dysplasia (FCD) in the proband. We aim to identify the molecular cause in this family and clarify the relationship between FCD and ADEAF. A large Iranian Jewish family including 14 individuals with epileptic seizures was phenotyped including high-resolution 3-T MRI. We performed linkage analysis and exome sequencing. LGI1, KANK1 and RELN were Sanger sequenced. Seizure semiology of 11 individuals was consistent with ADEAF. The proband underwent surgery for right mesiotemporal FCD. 3-T MRIs in four individuals were unremarkable. Linkage analysis revealed peaks on chromosome 9p24 (LOD 2.43) and 10q22–25 (LOD 2.04). A novel heterozygous LGI1 mutation was identified in all affected individuals except for the proband indicating a phenocopy. Exome sequencing did not reveal variants within the chromosome 9p24 region. Closely located variants in KANK1 and a RELN variant did not segregate with the phenotype. We provide detailed description of the phenotypic spectrum within a large ADEAF family with a novel LGI1 mutation that was conspicuously absent in the proband with FCD, demonstrating that despite identical clinical symptoms, phenocopies in ADEAF families may exist. This family illustrates that rare epilepsy syndromes within a single family can have both genetic and structural etiologies.
Published: 2015

44. The impact of rare variants in FUS in essential tremor

Author: May Bungeroth, Lukas Tittmann, Gregor Kuhlenbäumer, Manuela Pendziwiat, Alexis Brice, Alexandra Durr, Susanne A. Schneider, Giovanni Stevanin, Günther Deuschl, Delia Lorenz, Stefanie H. Müller, Mathieu Anheim, Emeline Mundwiller, Franziska Hopfner, and Stephan Klebe
Subjects: Genetics, Mutation, education.field_of_study, Essential tremor, Population, Familial disorder, Biology, medicine.disease, medicine.disease_cause, DNA sequencing, Neurology, medicine, Coding region, Neurology (clinical), education, Gene, Exome
Abstract: Objective: We analyzed the coding region of the Fused in Sarcoma (FUS) gene in familial essential tremor (ET) and reviewed previous studies assessing FUS variants in ET. Background: ET is often a familial disorder with an autosomal dominant inheritance pattern. A potentially causative variant in FUS has been identified in one ET family. Subsequent studies described further putatively causal variants. Methods: We performed DNA sequencing of FUS in 85 unrelated, familial German and French definite ET patients. Results: We did not find novel variants affecting the protein sequence. Seven previously published studies and data from the exome variant server (EVS) showed that rare exonic variants in FUS are not more frequent in ET than in the general population. Conclusions: Our findings provide no evidence for a role of rare genetic variants in the pathogenesis of ET, apart from the initially published FUS mutation segregating in a large ET family.
Published: 2015

45. The phenotypic spectrum of ARHGEF9 includes intellectual disability, focal epilepsy and febrile seizures

Author: Moien Kanaan, Manuela Pendziwiat, Ingo Helbig, Ilan Blatt, Zaid Afawi, Felix Rosenow, Ronit Gilad, Karl Martin Klein, and Anda Eilam
Subjects: 0301 basic medicine, Adult, Male, medicine.medical_specialty, Pediatrics, Neurology, Adolescent, Seizures, Febrile, 03 medical and health sciences, symbols.namesake, Epilepsy, Young Adult, Intellectual Disability, Intellectual disability, medicine, SNP, Humans, Family, Hyperekplexia, Young adult, Psychiatry, Exome sequencing, Sanger sequencing, medicine.disease, 030104 developmental biology, Phenotype, symbols, Female, Neurology (clinical), Epilepsies, Partial, medicine.symptom, Psychology, Rho Guanine Nucleotide Exchange Factors
Abstract: Mutations or structural genomic alterations of the X-chromosomal gene ARHGEF9 have been described in male and female patients with intellectual disability. Hyperekplexia and epilepsy were observed to a variable degree, but incompletely described. Here, we expand the phenotypic spectrum of ARHGEF9 by describing a large Ethiopian-Jewish family with epilepsy and intellectual disability. The four affected male siblings, their unaffected parents and two unaffected female siblings were recruited and phenotyped. Parametric linkage analysis was performed using SNP microarrays. Variants from exome sequencing in two affected individuals were confirmed by Sanger sequencing. All affected male siblings had febrile seizures from age 2–3 years and intellectual disability. Three developed afebrile seizures between age 7–17 years. Three showed focal seizure semiology. None had hyperekplexia. A novel ARHGEF9 variant (c.967G>A, p.G323R, NM_015185.2) was hemizygous in all affected male siblings and heterozygous in the mother. This family reveals that the phenotypic spectrum of ARHGEF9 is broader than commonly assumed and includes febrile seizures and focal epilepsy with intellectual disability in the absence of hyperekplexia or other clinically distinguishing features. Our findings suggest that pathogenic variants in ARHGEF9 may be more common than previously assumed in patients with intellectual disability and mild epilepsy.
Published: 2017

46. De Novo Mutations in Synaptic Transmission Genes Including DNM1 Cause Epileptic Encephalopathies

Author: Silke Appenzeller, Rudi Balling, Nina Barisic, Stéphanie Baulac, Hande Caglayan, Dana Craiu, Peter De Jonghe, Christel Depienne, Petia Dimova, Tania Djémié, Padhraig Gormley, Renzo Guerrini, Ingo Helbig, Helle Hjalgrim, Dorota Hoffman-Zacharska, Johanna Jähn, Karl Martin Klein, Bobby Koeleman, Vladimir Komarek, Roland Krause, Gregor Kuhlenbäumer, Eric Leguern, Anna-Elina Lehesjoki, Johannes R. Lemke, Holger Lerche, Tarja Linnankivi, Carla Marini, Patrick May, Rikke S. Møller, Hiltrud Muhle, Deb Pal, Aarno Palotie, Manuela Pendziwiat, Angela Robbiano, Filip Roelens, Felix Rosenow, Kaja Selmer, Jose M. Serratosa, Sanjay Sisodiya, Ulrich Stephani, Katalin Sterbova, Pasquale Striano, Arvid Suls, Tiina Talvik, Sarah von Spiczak, Yvonne Weber, Sarah Weckhuysen, Federico Zara, Bassel Abou-Khalil, Brian K. Alldredge, Eva Andermann, Frederick Andermann, Dina Amrom, Jocelyn F. Bautista, Samuel F. Berkovic, Judith Bluvstein, Alex Boro, Gregory Cascino, Damian Consalvo, Patricia Crumrine, Orrin Devinsky, Dennis Dlugos, Michael P. Epstein, Miguel Fiol, Nathan B. Fountain, Jacqueline French, Daniel Friedman, Eric B. Geller, Tracy Glauser, Simon Glynn, Kevin Haas, Sheryl R. Haut, Jean Hayward, Sandra L. Helmers, Sucheta Joshi, Andres Kanner, Heidi E. Kirsch, Robert C. Knowlton, Eric H. Kossoff, Rachel Kuperman, Ruben Kuzniecky, Daniel H. Lowenstein, Shannon M. McGuire, Paul V. Motika, Edward J. Novotny, Ruth Ottman, Juliann M. Paolicchi, Jack Parent, Kristen Park, Annapurna Poduri, Lynette Sadleir, Ingrid E. Scheffer, Renée A. Shellhaas, Elliott Sherr, Jerry J. Shih, Rani Singh, Joseph Sirven, Michael C. Smith, Joe Sullivan, Liu Lin Thio, Anu Venkat, Eileen P.G. Vining, Gretchen K. Von Allmen, Judith L. Weisenberg, Peter Widdess-Walsh, Melodie R. Winawer, Andrew S. Allen, Patrick Cossette, Norman Delanty, Evan E. Eichler, David B. Goldstein, Yujun Han, Erin L. Heinzen, Michael R. Johnson, Anthony G. Marson, Heather C. Mefford, Sahar Esmaeeli Nieh, Terence J. O’Brien, Stephen Petrou, Slavé Petrovski, Elizabeth K. Ruzzo, Neuroscience Center, Research Programs Unit, Department of Medical and Clinical Genetics, Research Programme for Molecular Neurology, Institute for Molecular Medicine Finland, Genomics of Neurological and Neuropsychiatric Disorders, EuroEPINOMICS-RES Consortium, Epilepsy Phenome Genome Project, and Epi4K Consortium
Subjects: 0301 basic medicine, Male, Proband, INTELLECTUAL DISABILITY, Type I, Bioinformatics, medicine.disease_cause, Infantile, Synaptic Transmission, Spasms, Cohort Studies, Epilepsy, 0302 clinical medicine, Receptors, SCHIZOPHRENIA, STXBP1, Exome, Gene Regulatory Networks, Protein Interaction Maps, Dynamin I, Genetics (clinical), Genetics, 0303 health sciences, Mutation, education.field_of_study, Medicine (all), Genome project, Fatty Acid Synthase, Type I, Fatty Acid Synthase, Female, APHASIA, Spasms, Infantile, DYNAMIN-1, EPILEPSIES, ENDOCYTOSIS, Population, SPECTRUM DISORDERS, Phenome, Neurotransmission, Biology, GNAO1, Article, 03 medical and health sciences, GRIN2A MUTATIONS, medicine, Humans, AUTISM, Infant, Newborn, Lennox Gastaut Syndrome, Receptors, GABA-B, Ryanodine Receptor Calcium Release Channel, education, Gene, De novo mutations, 030304 developmental biology, GABA-B, 3112 Neurosciences, Infant, Correction, Newborn, medicine.disease, Human genetics, 030104 developmental biology, DNM1, PATTERNS, Human medicine, 030217 neurology & neurosurgery, Lennox–Gastaut syndrome
Abstract: Emerging evidence indicates that epileptic encephalopathies are genetically highly heterogeneous, underscoring the need for large cohorts of well-characterized individuals to further define the genetic landscape. Through a collaboration between two consortia (EuroEPINOMICS and Epi4K/EPGP), we analyzed exome-sequencing data of 356 trios with the "classical" epileptic encephalopathies, infantile spasms and Lennox Gastaut syndrome, including 264 trios previously analyzed by the Epi4K/EPGP consortium. In this expanded cohort, we find 429 de nova mutations, including de novo mutations in DNM1 in five individuals and de nova mutations in GABBR2, FASN, and RYR3 in two individuals each. Unlike previous studies, this cohort is sufficiently large to show a significant excess of de nova mutations in epileptic encephalopathy probands compared to the general population using a likelihood analysis (p = 8.2 x 10(-4)), supporting a prominent role for de novo mutations in epileptic encephalopathies. We bring statistical evidence that mutations in DNM1 cause epileptic encephalopathy, find suggestive evidence for a role of three additional genes, and show that at least 12% of analyzed individuals have an identifiable causal de novo mutation. Strikingly, 75% of mutations in these probands are predicted to disrupt a protein involved in regulating synaptic transmission, and there is a significant enrichment of de nova mutations in genes in this pathway in the entire cohort as well. These findings emphasize an important role for synaptic dysregulation in epileptic encephalopathies, above and beyond that caused by ion channel dysfunction.
Published: 2017

47. Differential aggregation properties of alpha-synuclein isoforms

Author: Silke Appenzeller, W. Völker, Inken Lorenzen, Manuela Pendziwiat, Gregor Kuhlenbäumer, Annika Regulin, May Bungeroth, and Joachim Grötzinger
Subjects: Gene isoform, Aging, Molecular Sequence Data, Biology, Fibril, Protein Aggregation, Pathological, Protein Aggregates, chemistry.chemical_compound, In vivo, medicine, Humans, Protein Isoforms, Amino Acid Sequence, Gene, Alpha-synuclein, Lewy body, General Neuroscience, Alternative splicing, Brain, Parkinson Disease, medicine.disease, In vitro, Cell biology, HEK293 Cells, chemistry, Biochemistry, alpha-Synuclein, Neurology (clinical), Geriatrics and Gerontology, Developmental Biology
Abstract: Pathologic aggregation of α-synuclein is a central process in the pathogenesis of Parkinson's disease. The α-synuclein gene (SNCA) encodes at least 4 different α-synuclein isoforms through alternative splicing (SNCA140, SNCA126, SNCA112, SNCA98). Differential expression of α-synuclein isoforms has been shown in Lewy body diseases. In contrast to the canonical α-synuclein isoform of 140 amino acid residues (SNCA140), which has been investigated in detail, little is known about the properties of the 3 alternative isoforms. We have investigated the aggregation properties of all 4 isoforms in cultured cells and analyzed fibril-formation of 3 isoforms (SNCA140, SNCA126, and SNCA98) in vitro by electron microscopy. Each of the 3 alternative isoforms aggregates significantly less than the canonical isoform SNCA140. Electron microscopy showed that SNCA140 formed the well-known relatively straight fibrils while SNCA126 formed shorter fibrils, which were arranged in parallel fibril bundles and SNCA98 formed annular structures. Expression analysis of α-synuclein isoforms in different human brain regions demonstrated low expression levels of the alternative isoforms in comparison to the canonical SNCA140 isoform. These findings demonstrate that α-synuclein isoforms differ qualitatively and quantitatively in their aggregation properties. The biological consequences of these findings remain to be explored in vitro and in vivo.
Published: 2014

48. Correction: TANGO2: expanding the clinical phenotype and spectrum of pathogenic variants

Author: Amber Begtrup, Heather C Mefford, Hiltrud Muhle, Sharon F. Suchy, Barbara K. Burton, Angela Sun, Ingo Helbig, René Santer, J. Lawrence Merritt, Kolja Becker, Megan T. Cho, Katherine L. Helbig, Katie Golden-Grant, Amy Lacroix, Rachel Westman, Alison M. Muir, Ganka Douglas, Dmitriy Niyazov, Kristin G. Monaghan, Jennifer N. Dines, Almuth Caliebe, Jenny Thies, Leah Fleming, Manuela Pendziwiat, Can Ficicioglu, Alice Basinger, Dianne Laboy Cintrón, Katherine H. Kim, Kirsty McWalter, Francisca Millan, Joline C. Dalton, and Peter I. Karachunski
Subjects: Computer science, business.industry, Artificial intelligence, Clinical phenotype, business, computer.software_genre, Spectrum (topology), computer, Genetics (clinical), Natural language processing, Spelling
Abstract: The original version of this Article contained an error in the spelling of the author J. Lawrence Merritt, which was incorrectly given as Lawrence Merritt. This has now been corrected in both the PDF and HTML versions of the Article.
Published: 2019

49. Novel septin 9 repeat motifs altered in neuralgic amyotrophy bind and bundle microtubules

Author: Manuela Pendziwiat, Gregor Kuhlenbäumer, Xiaobo Bai, Tara K. Knox, Kaifeng Zhou, Charles V. Sindelar, Elias T. Spiliotis, and Jonathan R. Bowen
Subjects: SEPT2, Gene isoform, Amino Acid Motifs, macromolecular substances, Hereditary neuralgic amyotrophy, Biology, Septin, Microtubules, PC12 Cells, Madin Darby Canine Kidney Cells, 03 medical and health sciences, Dogs, 0302 clinical medicine, Tubulin, Microtubule, Report, medicine, Animals, Brachial Plexus Neuritis, Humans, Protein Isoforms, Research Articles, 030304 developmental biology, 0303 health sciences, Cell Biology, Alanine scanning, medicine.disease, Rats, 3. Good health, Cell biology, Biochemistry, biology.protein, biological phenomena, cell phenomena, and immunity, Septins, 030217 neurology & neurosurgery, Intracellular
Abstract: Novel septin 9 repeat motifs interact with the acidic C-terminal tails of β-tubulin to promote microtubule bundling and asymmetric neurite growth., Septin 9 (SEPT9) interacts with microtubules (MTs) and is mutated in hereditary neuralgic amyotrophy (HNA), an autosomal-dominant neuropathy. The mechanism of SEPT9 interaction with MTs and the molecular basis of HNA are unknown. Here, we show that the N-terminal domain of SEPT9 contains the novel repeat motifs K/R-x-x-E/D and R/K-R-x-E, which bind and bundle MTs by interacting with the acidic C-terminal tails of β-tubulin. Alanine scanning mutagenesis revealed that the K/R-R/x-x-E/D motifs pair electrostatically with one another and the tails of β-tubulin, enabling septin–septin interactions that link MTs together. SEPT9 isoforms lacking repeat motifs or containing the HNA-linked mutation R88W, which maps to the R/K-R-x-E motif, diminished intracellular MT bundling and impaired asymmetric neurite growth in PC-12 cells. Thus, the SEPT9 repeat motifs bind and bundle MTs, and thereby promote asymmetric neurite growth. These results provide the first insight into the mechanism of septin interaction with MTs and the molecular and cellular basis of HNA.
Published: 2013

50. Broad Phenotypic Heterogeneity due to a Novel SCN1A Mutation in a Family With Genetic Epilepsy With Febrile Seizures Plus

Author: Avinoam Shuper, Lina Basel-Vanagaite, Silke Appenzeller, Gregor Kuhlenbäumer, Manuela Pendziwiat, Odeya Bennett, Hadassa Goldberg-Stern, Sharon Aharoni, Zaid Afawi, Amos D. Korczyn, and Ingo Helbig
Subjects: Adult, Male, Proband, Adolescent, Mutation, Missense, Epilepsies, Myoclonic, Biology, Seizures, Febrile, Young Adult, Epilepsy, Exon, Dravet syndrome, Febrile seizure, medicine, Humans, Missense mutation, Family, Israel, Child, Aged, Genetics, Genetic heterogeneity, Infant, Middle Aged, medicine.disease, Phenotype, Pedigree, NAV1.1 Voltage-Gated Sodium Channel, Child, Preschool, Pediatrics, Perinatology and Child Health, Female, Neurology (clinical)
Abstract: Genetic (generalized) epilepsy with febrile seizures plus is a familial epilepsy syndrome with marked phenotypic heterogeneity ranging from simple febrile seizure to severe phenotypes. Here we report on a large Israeli family with genetic (generalized) epilepsy with febrile seizures plus and 14 affected individuals. A novel SCN1A missense mutation in exon 21 (p.K1372E) was identified in all affected individuals and 3 unaffected carriers. The proband had Dravet syndrome, whereas febrile seizure plus phenotypes were present in all other affected family members. Simple febrile seizures were not observed. Phenotypes were found at both extremes of the genetic (generalized) epilepsy with febrile seizures plus spectrum and distribution of phenotypes suggested modifying familial, possibly genetic factors. We suggest that families with extreme phenotype distributions can represent prime candidates for the identification of genetic or environmental modifiers.
Published: 2013

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