165 results on '"Chatron N"'
Search Results
2. ARID1B-related disorder in 87 adults: Natural history and self-sustainability
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van der Sluijs, P.J., Gösgens, M., Dingemans, A.J.M., Striano, P., Riva, A., Mignot, C., Faudet, A., Vasileiou, G., Walther, M., Schrier Vergano, S.A., Alders, M., Alkuraya, F.S., Alorainy, I., Alsaif, H.S., Anderlid, B., Bache, I., van Beek, I., Blanluet, M., van Bon, B.W., Brunet, T., Brunner, H., Carriero, M.L., Charles, P., Chatron, N., Coccia, E., Dubourg, C., Earl, R.K., Eichler, E.E., Faivre, L., Foulds, N., Graziano, C., Guerrot, A.M., Hashem, M.O., Heide, S., Heron, D., Hickey, S.E., Hopman, S.M.J., Kattentidt-Mouravieva, A., Kerkhof, J., Klein Wassink-Ruiter, J.S., Kurtz-Nelson, E.C., Kušíková, K., Kvarnung, M., Lecoquierre, F., Leszinski, G.S., Loberti, L., Magoulas, P.L., Mari, F., Maystadt, I., Merla, G., Milunsky, J.M., Moortgat, S., Nicolas, G., Leary, M.O.’, Odent, S., Ozmore, J.R., Parbhoo, K., Pfundt, R., Piccione, M., Pinto, A.M., Popp, B., Putoux, A., Rehm, H.L., Reis, A., Renieri, A., Rosenfeld, J.A., Rossi, M., Salzano, E., Saugier-Veber, P., Seri, M., Severi, G., Sonmez, F.M., Strobl-Wildemann, G., Stuurman, K.E., Uctepe, E., Van Esch, H., Vitetta, G., de Vries, B.B.A., Wahl, D., Wang, T., Zacher, P., Heitink, K.R., Ropers, F.G., Steenbeek, D., Rybak, T., and Santen, G.W.E.
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- 2024
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3. STAG2 microduplication in a patient with eyelid myoclonia and absences and a review of EMA-related reported genes
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Gokce-Samar, Z., de Bellescize, J., Arzimanoglou, A., Putoux, A., Chatron, N., Lesca, G., and Portes, V. des
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- 2022
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4. Prenatal microarray comparative genomic hybridization: Experience from the two first years of activity at the Lyon university-hospital
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Pons, L., Till, M., Alix, E., Abel, C., Boggio, D., Bordes, A., Caloone, J., Raskin, F.C., Chatron, N., Cordier, M.-P., Fichez, A., Labalme, A., Lajeunesse, C., Liaras, É., Massoud, M., Miribel, J., Ollagnon, E., Schluth-Bolard, C., Vichier-Cerf, A., Edery, P., Attia, J., Huissoud, C., Rudigoz, R.C., Massardier, J., Gaucherand, P., and Sanlaville, D.
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- 2017
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5. MED13L-related intellectual disability: involvement of missense variants and delineation of the phenotype
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Smol, T., Petit, F., Piton, A., Keren, B., Sanlaville, D., Afenjar, A., Baker, S., Bedoukian, E. C., Bhoj, E. J., Bonneau, D., Boudry-Labis, E., Bouquillon, S., Boute-Benejean, O., Caumes, R., Chatron, N., Colson, C., Coubes, C., Coutton, C., Devillard, F., Dieux-Coeslier, A., Doco-Fenzy, M., Ewans, L. J., Faivre, L., Fassi, E., Field, M., Fournier, C., Francannet, C., Genevieve, D., Giurgea, I., Goldenberg, A., Green, A. K., Guerrot, A. M., Heron, D., Isidor, B., Keena, B. A., Krock, B. L., Kuentz, P., Lapi, E., Le Meur, N., Lesca, G., Li, D., Marey, I., Mignot, C., Nava, C., Nesbitt, A., Nicolas, G., Roche-Lestienne, C., Roscioli, T., Satre, V., Santani, A., Stefanova, M., Steinwall Larsen, S., Saugier-Veber, P., Picker-Minh, S., Thuillier, C., Verloes, A., Vieville, G., Wenzel, M., Willems, M., Whalen, S., Zarate, Y. A., Ziegler, A., Manouvrier-Hanu, S., Kalscheuer, V. M., Gerard, B., and Ghoumid, Jamal
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- 2018
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6. Les tests non invasifs en période prénatale : avantages et limites
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Chatron, N., Sanlaville, D., and Schluth-Bolard, C.
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- 2016
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7. Inhibition of G-protein signalling in cardiac dysfunction of intellectual developmental disorder with cardiac arrhythmia (IDDCA) syndrome
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De Nittis P., Efthymiou S., Sarre A., Guex N., Chrast J., Putoux A., Sultan T., Raza Alvi J., Ur Rahman Z., Zafar F., Rana N., Rahman F., Anwar N., Maqbool S., Zaki M. S., Gleeson J. G., Murphy D., Galehdari H., Shariati G., Mazaheri N., Sedaghat A., Lesca G., Chatron N., Salpietro V., Christoforou M., Houlden H., Simonds W. F., Pedrazzini T., Maroofian R., Reymond A., SYNAPS STUDY GROUP: SYNAPS Study Group: Stanislav Groppa, Blagovesta Marinova Karashova, Wolfgang Nachbauer, Sylvia Boesch, Larissa Arning, Dagmar Timmann, Bru Cormand, Belen Pérez-Dueñas, Jatinder S Goraya, Tipu Sultan, Jun Mine, Daniela Avdjieva, Hadil Kathom, Radka Tincheva, Selina Banu, Mercedes Pineda-Marfa, Pierangelo Veggiotti, Michel D. Ferrari, Arn M. J. M. van den Maagdenberg, Alberto Verrotti, Giangluigi Marseglia, Salvatore Savasta, Mayte García-Silva, Alfons Macaya Ruiz, Barbara Garavaglia, Eugenia Borgione, Simona Portaro, Benigno Monteagudo Sanchez, Richard Boles, Savvas Papacostas, Michail Vikelis, Eleni Zamba Papanicolaou, Efthymios Dardiotis, Shazia Maqbool, Shahnaz Ibrahim, Salman Kirmani, Nuzhat Noureen Rana, Osama Atawneh, George Koutsis, Salvatore Mangano, Carmela Scuderi, Giovanna Morello, Tanya Stojkovic, Massimo Zollo, Gali Heimer, Yves A. Dauvilliers, Pasquale Striano, Issam Al-Khawaja, Fuad Al-Mutairi, Hamed Sherifa., University of Lausanne (UNIL), University College of London [London] (UCL), Hôpital Femme Mère Enfant [CHU - HCL] (HFME), Hospices Civils de Lyon (HCL), Children's Hospital [Lahore], Institute of Child Health [Lahore], Children's Hospital [Multan], Institute of Child Health [Multan], National Research Centre - NRC (EGYPT), Howard Hughes Medical Institute (HHMI), Shahid Chamran University of Ahvaz (SCU), Ahvaz Jundishapur University of Medical Sciences (AJUMS), National Institutes of Health [Bethesda] (NIH), Centre Hospitalier Régional Universitaire [Montpellier] (CHRU Montpellier), Neuropsychiatrie : recherche épidémiologique et clinique (PSNREC), Université Montpellier 1 (UM1)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Montpellier (UM), Université Montpellier 1 (UM1)-Université de Montpellier (UM)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université de Lausanne = University of Lausanne (UNIL), Herrada, Anthony, P., De Nitti, S., Efthymiou, A., Sarre, N., Guex, J., Chrast, A., Putoux, T., Sultan, J., Raza Alvi, Z., Ur Rahman, F., Zafar, N., Rana, F., Rahman, N., Anwar, S., Maqbool, M. S., Zaki, J. G., Gleeson, D., Murphy, H., Galehdari, G., Shariati, N., Mazaheri, A., Sedaghat, G., Lesca, N., Chatron, V., Salpietro, M., Christoforou, H., Houlden, W. F., Simond, T., Pedrazzini, R., Maroofian, A., Reymond, STUDY GROUP: SYNAPS Study Group: Stanislav Groppa, Synap, Marinova Karashova, Blagovesta, Nachbauer, Wolfgang, Boesch, Sylvia, Arning, Larissa, Timmann, Dagmar, Cormand, Bru, Pérez-Dueñas, Belen, S Goraya, Jatinder, Sultan, Tipu, Mine, Jun, Avdjieva, Daniela, Kathom, Hadil, Tincheva, Radka, Banu, Selina, Pineda-Marfa, Mercede, Veggiotti, Pierangelo, Ferrari, Michel D., van den Maagdenberg, Arn M. J. M., Verrotti, Alberto, Marseglia, Giangluigi, Savasta, Salvatore, García-Silva, Mayte, Macaya Ruiz, Alfon, Garavaglia, Barbara, Borgione, Eugenia, Portaro, Simona, Monteagudo Sanchez, Benigno, Boles, Richard, Papacostas, Savva, Vikelis, Michail, Zamba Papanicolaou, Eleni, Dardiotis, Efthymio, Maqbool, Shazia, Ibrahim, Shahnaz, Kirmani, Salman, Noureen Rana, Nuzhat, Atawneh, Osama, Koutsis, George, Mangano, Salvatore, Scuderi, Carmela, Morello, Giovanna, Stojkovic, Tanya, Zollo, Massimo, Heimer, Gali, Dauvilliers, Yves A., Striano, Pasquale, Al-Khawaja, Issam, Al-Mutairi, Fuad, and Sherifa., Hamed
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Male ,0301 basic medicine ,Developmental Disabilities ,Batecs cardíacs ,0302 clinical medicine ,Neurodevelopmental disorder ,Heart Rate ,Medicine ,Child ,Genetics (clinical) ,Mice, Knockout ,Gnb5-null mouse models ,GTP-Binding Protein beta Subunits ,Cardiac muscle ,Heart ,Syndrome ,IDDCA ,Functional Genomics ,Pedigree ,[SDV.MHEP.CSC] Life Sciences [q-bio]/Human health and pathology/Cardiology and cardiovascular system ,cardiac conduction anomalies ,Gnb5 -null mouse models ,GNB5 variants ,medicine.anatomical_structure ,Child, Preschool ,[SDV.BBM.GTP] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN] ,Female ,medicine.symptom ,Signal Transduction ,Bradycardia ,Cardiac function curve ,Gnb5 -null mouse model ,medicine.medical_specialty ,Adolescent ,[SDV.GEN.GH] Life Sciences [q-bio]/Genetics/Human genetics ,Contractility ,Young Adult ,Brain damage ,03 medical and health sciences ,[SDV.MHEP.CSC]Life Sciences [q-bio]/Human health and pathology/Cardiology and cardiovascular system ,GNB5variants ,[SDV.BBM.GTP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Genomics [q-bio.GN] ,Internal medicine ,Exome Sequencing ,Heart rate ,Genetics ,Animals ,Humans ,business.industry ,Gene Expression Profiling ,Heart beat ,Proteins ,Cardiac arrhythmia ,Arrhythmias, Cardiac ,GNB5 variant ,medicine.disease ,Mice, Inbred C57BL ,Autonomic nervous system ,030104 developmental biology ,Endocrinology ,[SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics ,Mutation ,Lesions cerebrals ,cardiac conduction anomalie ,business ,Proteïnes ,030217 neurology & neurosurgery - Abstract
BackgroundPathogenic variants of GNB5 encoding the β5 subunit of the guanine nucleotide-binding protein cause IDDCA syndrome, an autosomal recessive neurodevelopmental disorder associated with cognitive disability and cardiac arrhythmia, particularly severe bradycardia.MethodsWe used echocardiography and telemetric ECG recordings to investigate consequences of Gnb5 loss in mouse.ResultsWe delineated a key role of Gnb5 in heart sinus conduction and showed that Gnb5-inhibitory signalling is essential for parasympathetic control of heart rate (HR) and maintenance of the sympathovagal balance. Gnb5−/− mice were smaller and had a smaller heart than Gnb5+/+ and Gnb5+/−, but exhibited better cardiac function. Lower autonomic nervous system modulation through diminished parasympathetic control and greater sympathetic regulation resulted in a higher baseline HR in Gnb5−/− mice. In contrast, Gnb5−/− mice exhibited profound bradycardia on treatment with carbachol, while sympathetic modulation of the cardiac stimulation was not altered. Concordantly, transcriptome study pinpointed altered expression of genes involved in cardiac muscle contractility in atria and ventricles of knocked-out mice. Homozygous Gnb5 loss resulted in significantly higher frequencies of sinus arrhythmias. Moreover, we described 13 affected individuals, increasing the IDDCA cohort to 44 patients.ConclusionsOur data demonstrate that loss of negative regulation of the inhibitory G-protein signalling causes HR perturbations in Gnb5−/− mice, an effect mainly driven by impaired parasympathetic activity. We anticipate that unravelling the mechanism of Gnb5 signalling in the autonomic control of the heart will pave the way for future drug screening.
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- 2020
8. The enrichment of breakpoints in late-replicating chromatin provides novel insights into chromoanagenesis mechanisms
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Chatron, N., Giannuzzi, G., Rollat-Farnier, P., Diguet, F., Porcu, E., Yammine, T., Uguen, K., Bellil, Z., Zillhardt, J. Lauer, Sorlin, A., Ader, F., Afenjar, A., Andrieux, J., Bardel, Claire, Calpena, E., Chantot-Bastaraud, S., Callier, P., Chelloug, N., Chopin, E., Cordier, M., Dubourg, C., Faivre, L., Girard, F., Heide, S., Herenger, Y., Jaillard, S., Keren, B., Knight, S. J. L., Lespinasse, J., Lohmann, L., Marle, N., Maroofian, R., Masurel-Paulet, Alice, Mathieu-Dramard, M., Metay, C., Pagnamenta, A. T., Portnoi, M., Prieur, F., Rio, M., Siffroi, J., Valence, S., Taylor, J. C., Wilkie, A. O. M., Edery, P., Reymond, A., Sanlaville, D., Schluth-Bolard, C., Hôpital Edouard Herriot [CHU - HCL], Hospices Civils de Lyon (HCL), Centre de recherche en neurosciences de Lyon - Lyon Neuroscience Research Center (CRNL), Université Claude Bernard Lyon 1 (UCBL), 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), Hospices Civils de Lyon, Departement de Neurologie (HCL), Université de Lausanne = University of Lausanne (UNIL), Centre Hospitalier Régional Universitaire de Brest (CHRU Brest), Laboratoire de Diagnostic Génétique [CHU Strasbourg], Université de Strasbourg (UNISTRA)-CHU Strasbourg, Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), Centre de génétique - Centre de référence des maladies rares, anomalies du développement et syndromes malformatifs (CHU de Dijon), Assistance publique-Hôpitaux de Paris - Espace éthique (AP-HP Espace éthique), 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), CHU Trousseau [APHP], Service de neurophysiologie clinique (CHRU Lille), Centre Hospitalier Régional Universitaire [Lille] (CHRU Lille), The Weatherall Institute of Molecular Medicine, University of Oxford, Centre Hospitalier Régional Universitaire de Tours (CHRU Tours), CHU Pontchaillou [Rennes], 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 ), CHU Strasbourg, The Wellcome Trust Centre for Human Genetics [Oxford], Centre Hospitalier Métropole Savoie [Chambéry], Laboratoire CERBA [Saint Ouen l'Aumône], University College of London [London] (UCL), CHU Amiens-Picardie, CHU Henri Mondor [Créteil], Centre Hospitalier Universitaire de Saint-Etienne [CHU Saint-Etienne] (CHU ST-E), CHU Necker - Enfants Malades [AP-HP], Université Paris 1 Panthéon-Sorbonne (UP1), Chard-Hutchinson, Xavier, 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), Service d'Hépato-Gastro-Entérologie [CHU Pitié-Salpêtrière], CHU Henri Mondor, Centre Hospitalier Universitaire de Saint-Etienne (CHU de Saint-Etienne), 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), Université de Lausanne (UNIL), Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), University of Oxford [Oxford], Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique )-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Sorbonne Université (SU)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Centre Hospitalier Régional Universitaire de Tours (CHRU TOURS), Université de Rennes 1 (UR1), and 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 )
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[SDV] Life Sciences [q-bio] ,[SDV]Life Sciences [q-bio] ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
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- 2020
9. Bi-allelic GAD1 variants cause a neonatal onset syndromic developmental and epileptic encephalopathy
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Chatron, N, Becker, F, Morsy, H, Schmidts, M, Hardies, K, Tuysuz, B, Roselli, S, Najafi, M, Alkaya, DU, Ashrafzadeh, F, Nabil, A, Omar, T, Maroofian, R, Karimiani, EG, Hussien, H, Kok, F, Ramos, L, Gunes, N, Bilguvar, K, Labalme, A, Alix, E, Sanlaville, D, de Bellescize, J, Poulat, A-L, EuroEpinomics-RES consortium AR working group, Moslemi, A-R, Lerche, H, May, P, Lesca, G, Weckhuysen, S, Tajsharghi, H, Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], and University of Luxembourg: High Performance Computing - ULHPC [research center]
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cleft palate ,Epilepsy ,Hypsarrhythmia ,omphalocele ,GAD1 ,Suppression-burs ,Developmental Syndrome ,Genetics & genetic processes [F10] [Life sciences] ,Génétique & processus génétiques [F10] [Sciences du vivant] ,arthrogryposis - Abstract
Developmental and Epileptic Encephalopathies are a heterogeneous group of early-onset epilepsy syndromes dramatically impairing neurodevelopment. Modern genomic technologies have revealed a number of monogenic origins and opened the door to therapeutic hopes. Here we describe a new syndromic developmental and epileptic encephalopathies caused by bi-allelic loss of function variants in GAD1, as presented by eleven patients from 6 independent consanguineous families. Seizure onset occurred in the two first months of life in all patients. All 10 patients from whom early disease history was available, presented seizure onset in the first month of life, mainly consisting of epileptic spasms or myoclonic seizures. Early electroencephalography showed suppression-burst or pattern of burst attenuation or hypsarrhythmia if only recorded in the post-neonatal period. Eight patients had joint contractures and/or pes equinovarus. Seven patients presented a cleft palate and two also had an omphalocele, reproducing the phenotype of the knockout Gad1-/- mouse model. Four patients died before four years of age. GAD1 encodes the glutamate decarboxylase enzyme GAD67, a critical actor of the γ-aminobutyric acid (GABA) metabolism as it catalyzes the decarboxylation of glutamic acid to form GABA. Our findings evoke a novel syndrome related to GAD67 deficiency, characterized by the unique association of developmental and epileptic encephalopathies, cleft palate, joint contractures and/or omphalocele.
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- 2020
10. Defining and expanding the phenotype of QARS-associated developmental epileptic encephalopathy
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Johannesen, Km, Mitter, D, Janowski, R, Roth, C, Toulouse, J, Poulat, Al, Ville, Dm, Chatron, N, Brilstra, E, Geleijns, K, Born, Ap, McLean, S, Nugent, K, Baynam, G, Poulton, C, Dreyer, L, Gration, D, Schulz, S, Dieckmann, A, Helbig, Kl, Merkenschlager, A, Jamra, R, Finck, A, Gardella, E, Hjalgrim, H, Mirzaa, G, Brancati, F, Bierhals, T, Denecke, J, Hempel, M, Lemke, Jr, Rubboli, G, Muschke, P, Guerrini, R, Vetro, A, Niessing, D, Lesca, G, and Møller, Rs
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TRANSFER-RNA-SYNTHETASE ,ILAE COMMISSION ,POSITION PAPER ,MUTATIONS ,CLASSIFICATION ,DEFICIENCY ,FEATURES - Published
- 2020
11. Phenotypic spectrum and transcriptomic profile associated with germline variants in TRAF7
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Castilla-Vallmanya L, Selmer KK, Dimartino C, Raquel Rabionet Janssen, Blanco-Sánchez B, Yang S, Reijnders MRF, van Essen AJ, Oufadem M, Vigeland MD, Stadheim B, Houge G, Cox H, Kingston H, Clayton-Smith J, Innis JW, Iascone M, Cereda A, Gabbiadini S, Chung WK, Sanders V, Charrow J, Bryant E, Millichap J, Vitobello A, Thauvin C, Mau-Them FT, Faivre L, Lesca G, Labalme A, Rougeot C, Chatron N, Sanlaville D, Christensen KM, Kirby A, Lewandowski R, Gannaway R, Aly M, Lehman A, Clarke L, Graul-Neumann L, Zweier C, Lessel D, Lozic B, Aukrust I, Peretz R, Stratton R, Smol T, Dieux-Coëslier A, Meira J, Wohler E, Sobreira N, Beaver EM, Heeley J, Briere LC, High FA, Sweetser DA, Walker MA, Keegan CE, Jayakar P, Shinawi M, Kerstjens-Frederikse WS, Earl DL, Siu VM, Reesor E, Yao T, Hegele RA, Vaske OM, Rego S, Undiagnosed Diseases Network, Care4Rare Canada Consortium, Shapiro KA, Wong B, Gambello MJ, McDonald M, Karlowicz D, Colombo R, Serretti A, Pais L, O'Donnell-Luria A, Wray A, Sadedin S, Chong B, Tan TY, Christodoulou J, White SM, Slavotinek A, Barbouth D, Morel Swols D, Parisot M, Bole-Feysot C, Nitschké P, Pingault V, Munnich A, Cho MT, Cormier-Daire V, Balcells S, Lyonnet S, Grinberg-Vaisman DR, Amiel J, Urreizti R, and Gordon CT
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craniofacial development ,patent ductus arteriosus ,TRAF7 ,intellectual disability ,blepharophimosis - Abstract
PURPOSE: Somatic variants in tumor necrosis factor receptor-associated factor 7 (TRAF7) cause meningioma, while germline variants have recently been identified in seven patients with developmental delay and cardiac, facial, and digital anomalies. We aimed to define the clinical and mutational spectrum associated with TRAF7 germline variants in a large series of patients, and to determine the molecular effects of the variants through transcriptomic analysis of patient fibroblasts. METHODS: We performed exome, targeted capture, and Sanger sequencing of patients with undiagnosed developmental disorders, in multiple independent diagnostic or research centers. Phenotypic and mutational comparisons were facilitated through data exchange platforms. Whole-transcriptome sequencing was performed on RNA from patient- and control-derived fibroblasts. RESULTS: We identified heterozygous missense variants in TRAF7 as the cause of a developmental delay-malformation syndrome in 45 patients. Major features include a recognizable facial gestalt (characterized in particular by blepharophimosis), short neck, pectus carinatum, digital deviations, and patent ductus arteriosus. Almost all variants occur in the WD40 repeats and most are recurrent. Several differentially expressed genes were identified in patient fibroblasts. CONCLUSION: We provide the first large-scale analysis of the clinical and mutational spectrum associated with the TRAF7 developmental syndrome, and we shed light on its molecular etiology through transcriptome studies.
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- 2020
12. Clinical spectrum of STX1B-related epileptic disorders
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Wolking, S, May, P, Mei, D, Møller, RS, Balestrini, S, Helbig, KL, Altuzarra, CD, Chatron, N, Kaiwar, C, Stöhr, K, Widdess-Walsh, P, Mendelsohn, BA, Numis, A, Cilio, MR, Van Paesschen, W, Svendsen, LL, Oates, S, Hughes, E, Goyal, S, Brown, K, Saenz, M, Dorn, T, Muhle, H, Pagnamenta, AT, Vavoulis, DV, Knight, SJL, Taylor, JC, Canevini, MP, Darra, F, Gavrilova, RH, Powis, Z, Tang, S, Marquetand, J, Armstrong, M, McHale, D, Klee, EW, Kluger, GJ, Lowenstein, DH, Weckhuysen, S, Pal, DK, Helbig, I, Guerrini, R, Thomas, RH, Rees, MI, Lesca, G, Sisodiya, SM, Weber, YG, Lal, D, Marini, C, Lerche, H, and Schubert, J
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Male ,Drug Resistant Epilepsy ,Adolescent ,Developmental Disabilities ,Mutation, Missense ,Clinical Neurology ,FEBRILE SEIZURES PLUS ,GENERALIZED EPILEPSY ,Syntaxin 1 ,PROTEIN ,Article ,Seizures, Febrile ,Young Adult ,Loss of Function Mutation ,Humans ,HETEROGENEITY ,SCN1A ,Child ,Epilepstic disorders ,Science & Technology ,Learning Disabilities ,Infant, Newborn ,High-Throughput Nucleotide Sequencing ,Infant ,GENETIC-VARIATION ,Electroencephalography ,Sequence Analysis, DNA ,SODIUM-CHANNEL ,Epilepstic disorders, STX1B ,Phenotype ,DE-NOVO MUTATIONS ,Child, Preschool ,ONSET ,STXBP1 ,STX1B ,Anticonvulsants ,Female ,Human medicine ,Epilepsies, Partial ,Neurosciences & Neurology ,Epileptic Syndromes ,Life Sciences & Biomedicine - Abstract
OBJECTIVE: The aim of this study was to expand the spectrum of epilepsy syndromes related to STX1B, encoding the presynaptic protein syntaxin-1B, and establish genotype-phenotype correlations by identifying further disease-related variants. METHODS: We used next-generation sequencing in the framework of research projects and diagnostic testing. Clinical data and EEGs were reviewed, including already published cases. To estimate the pathogenicity of the variants, we used established and newly developed in silico prediction tools. RESULTS: We describe 17 new variants in STX1B, which are distributed across the whole gene. We discerned 4 different phenotypic groups across the newly identified and previously published patients (49 patients in 23 families): (1) 6 sporadic patients or families (31 affected individuals) with febrile and afebrile seizures with a benign course, generally good drug response, normal development, and without permanent neurologic deficits; (2) 2 patients with genetic generalized epilepsy without febrile seizures and cognitive deficits; (3) 13 patients or families with intractable seizures, developmental regression after seizure onset and additional neuropsychiatric symptoms; (4) 2 patients with focal epilepsy. More often, we found loss-of-function mutations in benign syndromes, whereas missense variants in the SNARE motif of syntaxin-1B were associated with more severe phenotypes. CONCLUSION: These data expand the genetic and phenotypic spectrum of STX1B-related epilepsies to a diverse range of epilepsies that span the International League Against Epilepsy classification. Variants in STX1B are protean and contribute to many different epilepsy phenotypes, similar to SCN1A, the most important gene associated with fever-associated epilepsies. ispartof: NEUROLOGY vol:92 issue:11 pages:E1238-E1249 ispartof: location:United States status: published
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- 2019
13. Whole Genome Sequencing of 9 patients allowed a better understanding of complex chromosomal rearrangements
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Girard, F., Jaillard, S., Keren, B., Lespinasse, J., Marle, N., Masurel, A., Mathieu, M., Metay, C., Portnoi, M., Prieur, F., Rio, M., Siffroi, J., Schluth-Bolard, C., Sanlaville, D., Chatron, N., Diguet, F., Rollat-Farnier, P., Uguen, K., Zillhardt, J. Lauer, Sorlin, A., Andrieux, J., Chantot-Bastaraud, S., Callier, P., Cordier, M., Dubourg, C., CHU Pontchaillou [Rennes], Institut de recherche en santé, environnement et travail (Irset), Université d'Angers (UA)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-École des Hautes Études en Santé Publique [EHESP] (EHESP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), CHU Pitié-Salpêtrière [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Sorbonne Université (SU), Laboratoire de cytogénétique (CHU de Dijon), Centre Hospitalier Universitaire de Dijon - Hôpital François Mitterrand (CHU Dijon), CHU Amiens-Picardie, Hôpital Henri Mondor, Centre Hospitalier Universitaire de Saint-Etienne (CHU de Saint-Etienne), Centre de recherche en neurosciences de Lyon (CRNL), Université Claude Bernard Lyon 1 (UCBL), 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), Hospices Civils de Lyon (HCL), Hôpital de la Cavale Blanche - CHRU Brest (CHU - BREST ), Equipe GAD (LNC - U1231), Lipides - Nutrition - Cancer [Dijon - U1231] (LNC), Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Bourgogne (UB)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut de Génétique et Développement de Rennes (IGDR), Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique )-Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES), Université d'Angers (UA)-Université de Rennes (UR)-École des Hautes Études en Santé Publique [EHESP] (EHESP)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Centre Hospitalier Universitaire de Saint-Etienne [CHU Saint-Etienne] (CHU ST-E), Centre de recherche en neurosciences de Lyon - Lyon Neuroscience Research Center (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), Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement-Université de Bourgogne (UB)-Institut National de la Santé et de la Recherche Médicale (INSERM)-AgroSup Dijon - Institut National Supérieur des Sciences Agronomiques, de l'Alimentation et de l'Environnement, 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 ), and Jonchère, Laurent
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[SDV] Life Sciences [q-bio] ,[SDV]Life Sciences [q-bio] ,ComputingMilieux_MISCELLANEOUS - Abstract
International audience
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- 2019
14. Severe cognitive impairment and early-onset epilepsy in six patients with the de novo p.Glu590Lys variant of CUX2
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Chatron, N., Moller, R.S., Champaigne, N.L., Küchler, Alma, Labalme, A., Baggett, L., Wieczorek, Dagmar, Gardella, E., and Scheffer, I.A.
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Medizin ,ComputingMethodologies_GENERAL - Abstract
Poster Abstract
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- 2019
15. Detection of rare autosomal trisomies through non‐invasive prenatal testing: benefits for pregnancy management
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Chatron, N., primary, Till, M., additional, Abel, C., additional, Bardel, C., additional, Ramond, F., additional, Sanlaville, D., additional, and Schluth‐Bolard, C., additional
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- 2019
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16. Study of six patients with complete F9 deletion characterized by cytogenetic microarray: role of the SOX3 gene in intellectual disability
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Jourdy, Y., Chatron, N., Carage, M.‐L., Fretigny, M., Meunier, S., Zawadzki, C., Gay, V., Negrier, C., Sanlaville, D., and Vinciguerra, C.
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- 2016
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17. Identification of the functional states of human vitamin K epoxide reductase from molecular dynamics simulations
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Chatron, N., Chalmond, B., Trouve, A., Benoit, Etienne, Caruel, H., Lattard, Virginie, Tchertanov, L., Liphatech, Centre de Mathématiques et de Leurs Applications (CMLA), École normale supérieure - Cachan (ENS Cachan)-Centre National de la Recherche Scientifique (CNRS), VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS), Rongeurs Sauvages, Risques Sanitaires et Gestion des Populations - UR 1233 (RS2GP), Institut National de la Recherche Agronomique (INRA)-VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS), GENCI-IDRIS 2016-077291, Rongeurs Sauvages – Risques Sanitaires et Gestion des Populations, INRA, VetAgro Sup ( USC1233/RS2GP ), Institut National de la Recherche Agronomique ( INRA ) -VetAgro Sup ( VAS ), Centre de Mathématiques et de Leurs Applications ( CMLA ), and École normale supérieure - Cachan ( ENS Cachan ) -Centre National de la Recherche Scientifique ( CNRS )
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vitamine k ,[SDV.BBM.BS]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM] ,[ SDV.BBM.BC ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM] ,protéine ,Chimie analytique ,topologie membranaire ,réticulum endoplasmique ,Analytical chemistry ,[ SDV.BBM.BS ] Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM] ,[SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM] - Abstract
International audience; In mammalians, the enzymatic activity of vitamin K epoxide reductase (VKORC1) requires a protein conformational reorganisation that includes several transient enzymatic states involving a dynamic electron transfer. Regarding the structurally non-characterised human enzyme (hVKORC1), this process remains poorly explained and the different redox states of the enzyme generated by its biochemical transformation are unknown. Here, we report a 3D model of the fully reduced hVKORC1 at the atomistic level. By exploring this model through molecular dynamics (MD) simulations, we established the most probable intermediate states of the enzyme which were used for generation of the putative functionally-related enzymatic states. Enzymatic functionality of each state was assigned by probing their recognition properties with respect to vitamin K in its quinone and hydroxyquinone forms. Two states were identified as contributing to the two-step vitamin K transformation. The state highly selective for native vitamin K was further validated through analyses of its free energy of binding with vitamin K agonists (VKAs) that showed a high correlation with the experimental inhibiting constants.
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- 2017
18. Early-Onser Epilepsy and Severe cognitive Impairment in six Patients with the de NOVO P.GLU590LYS Variantof CUX2
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Chatron, N., Moller, R. S., Champaigne, N. L., Küchler, Alma, Labalme, A., Baggett, L., Wieczorek, Dagmar, Portes, D. V., Edery, P., Gardella, E., Scheffer, I. E., Mefford, H., Sanlaville, D., Carvill, G. L., and Lesca, G.
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Medizin - Published
- 2017
19. Severe cognitive impairment and early-onset epilepsy in six patients with the de novo p.Glu590Lys variant of CUX2
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Chatron, N., primary, Møller, R.S., additional, Champaigne, N.L., additional, Kuechler, A., additional, Labalme, A., additional, Baggett, L., additional, Wieczorek, D., additional, Portes, V. des, additional, Edery, P., additional, Gardella, E., additional, Scheffer, I.E., additional, Mefford, H., additional, Sanlaville, D., additional, Carvill, G.L., additional, and Lesca, G., additional
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- 2017
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20. Three new cases of asparagine synthetase deficiency: Confirmation of a poor neurological outcome and a new molecular mechanism
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Faoucher, M., primary, Putoux, A., additional, Francannet, C., additional, Poulat, A.L., additional, Chatron, N., additional, Aquaviva, C., additional, Labalme, A., additional, Schluth-Bolard, C., additional, Till, M., additional, Saban, C., additional, Desportes, V., additional, Sanlaville, D., additional, Edery, P., additional, and Lesca, G., additional
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- 2017
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21. West syndrome due to compound heterozygous QARS mutations
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Poulat, A.L., primary, Lesca, G., additional, Chatron, N., additional, Labalme, A., additional, Des Portes, V., additional, Sanlaville, D., additional, De Bellescize, J., additional, and Ville, D., additional
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- 2017
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22. Next-generation sequencing allows a diagnostic yield of 23.7% in monogenic epilepsies
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Lesca, G., primary, Labalme, A., additional, Mignot, C., additional, Chatron, N., additional, Van de Velde Boermans, L., additional, des Portes, V., additional, Bogoin, J., additional, Ville, D., additional, de Belescize, J., additional, Nougues, M.C., additional, Doummar, D., additional, Afenjar, A., additional, Poulat, A.L., additional, Panagiotakaki, E., additional, Valence, S., additional, Arzimanoglou, A., additional, Heron, D., additional, Leguern, E., additional, Sanlaville, D., additional, and Nava, C., additional
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- 2017
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23. Christianson syndrome: An underestimated cause of electrical status epilepticus in sleep?
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Mathieu, M.-L., primary, de Bellescize, J., additional, Till, M., additional, Labalme, A., additional, Chatron, N., additional, Sanlaville, D., additional, Ostrowsky-Coste, K., additional, Des Portes, V., additional, and Lesca, G., additional
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- 2017
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24. Next-generation sequencing (NGS) is a powerful tool to improve diagnostic yield in intellectual disability
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Labalme, A., primary, Chatron, N., additional, Till, M., additional, Cordier, M.P., additional, Rossi, M., additional, Putoux, A., additional, Pons, L., additional, des Portes, V., additional, Edery, P., additional, Sanlaville, D., additional, and Lesca, G., additional
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- 2017
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25. Molecular cytogenetic characterization of fiveF8complex rearrangements: utility for haemophilia A genetic counselling
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Jourdy, Y., primary, Chatron, N., additional, Fretigny, M., additional, Carage, M. L., additional, Chambost, H., additional, Claeyssens-Donadel, S., additional, Roussel-Robert, V., additional, Negrier, C., additional, Sanlaville, D., additional, and Vinciguerra, C., additional
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- 2017
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26. A novel homozygous truncating mutation of the SFRP4 gene in Pyle's disease
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Chatron, N., primary, Lesca, G., additional, Labalme, A., additional, Rollat-Farnier, P.A., additional, Monin, P., additional, Pichot, E., additional, Edery, P., additional, Sanlaville, D., additional, and Rossi, M., additional
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- 2017
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27. Performance of semiconductor sequencing platform for non-invasive prenatal genetic screening for fetal aneuploidy: results from a multicenter prospective cohort study in a clinical setting.
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El Khattabi, L. Allach, Brun, S., Gueguen, P., Chatron, N., Guichoux, E., Schutz, S., Nectoux, J., Sorlin, A., Quere, M., Boudjarane, J., Tsatsaris, V., Mandelbrot, L., Schluth‐Bolard, C., Dupont, J. M., Rooryck, C., Cormier, Alexandre, Ferec, Claude, Da Foncesca Pipoli, Juliana, Letourneur, Franck, and Bonnet, Céline
- Abstract
Objective: To validate and evaluate the performance metrics of the high-throughput semiconductor sequencing platform, Ion Proton®, in non-invasive prenatal genetic screening (NIPS) for common fetal aneuploidies in a clinical setting.Methods: This prospective cohort study included 2505 pregnant women from eight academic genetics laboratories (695 high risk for trisomy 21 (risk ≥ 1/250) pregnancies in a validation study, and 1810 such pregnancies, without ultrasound anomalies, in a real-life NIPS clinical setting). Outcome was available for all cases in the validation cohort and for 521 in the clinical cohort. Cell-free DNA from plasma samples was sequenced using the Ion Proton sequencer, and sequencing data were analyzed using the open-access software, WISECONDOR. Performance metrics for detection of trisomies 21, 18 and 13 were calculated based on either fetal karyotype result or clinical data collected at birth. We also evaluated the failure rate and compared three methods of fetal fraction quantification (RASSF1A assay, and DEFRAG and SANEFALCON software).Results: Results from both cohorts were consistent and their gestational age was not significantly different so their data were combined to increase the sample size for analysis. Sensitivities and specificities, respectively, were as follows: for trisomy 21, 98.3% (95% CI, 93.5-99.7%) and 99.9% (95% CI, 99.4-100%); for trisomy 18, 96.7% (95% CI, 80.9-99.8%) and 100% (95% CI, 99.6-100%); and for trisomy 13, 94.1% (95% CI, 69.2-99.7%) and 100% (95% CI, 99.6-100%). Our failure rate was 1.2% initially and as low as 0.6% after retesting some of the failed samples. Fetal fraction estimation by the RASSF1A assay was consistent with DEFRAG results, and both were adequate for routine diagnosis.Conclusions: We describe one of the largest studies evaluating Ion Proton-based NIPS and the first clinical study reporting pregnancy outcome in a large series of patients. This platform is highly efficient in detecting the three most common trisomies. Our protocol is robust and can be implemented easily in any medical genetics laboratory. Copyright © 2018 ISUOG. Published by John Wiley & Sons Ltd. [ABSTRACT FROM AUTHOR]- Published
- 2019
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28. Molecular cytogenetic characterization of five F8 complex rearrangements: utility for haemophilia A genetic counselling.
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Jourdy, Y., Chatron, N., Fretigny, M., Carage, M. L., Chambost, H., Claeyssens-Donadel, S., Roussel-Robert, V., Negrier, C., Sanlaville, D., and Vinciguerra, C.
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HEMOPHILIA , *CYTOGENETICS , *HEMOPHILIACS , *GENETIC counseling , *GENOMES , *GENETICS - Abstract
Background Genomic inversions are usually balanced, but unusual patterns have been described in haemophilia A ( HA) patients for intron 22 (Inv22) and intron 1 (Inv1) inversions leading to the hypothesis of more complex rearrangements involving deletions or duplications. Aim To characterize five abnormal patterns either in Southern blot and long-range PCR for Inv22 or in PCR for Inv1. Materials and methods All patients were studied using cytogenetic microarray analysis ( CMA). Results In all cases, CMA analysis found that each inversion was associated with complex Xq28 rearrangement. In three patients, CMA analysis showed large duplication ranging from 230 to 1302 kb and encompassing a various number of contiguous genes among which RAB39B. RAB39B duplication is a strong candidate gene for X-linked intellectual disability ( XLID). Surprisingly, none of the severe HA patients with RAB39B duplication reported in this study or in the literature exhibited XLID. We hypothesise that F8 complex rearrangement down regulated RAB39B expression. In the two remaining patients, CMA analysis found Xq28 large deletion (from 285 to 522 kb). Moyamoya syndrome was strongly suspected in one of them who carried BRCC3 deletion. Conclusion Because several F8 neighbouring genes are associated with other pathologies such as XLID and cardiovascular disease, all HA patients where complex Xq28 rearrangement was suspected should be referred to a geneticist for possible utility of a pangenomic study. Such investigation should be carefully considered in genetic counselling in female carriers to assess the risk of transmitting severe HA with a 'contiguous gene syndrome'. [ABSTRACT FROM AUTHOR]
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- 2017
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29. Study of six patients with complete F9deletion characterized by cytogenetic microarray: role of the SOX3gene in intellectual disability
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Jourdy, Y., Chatron, N., Carage, M.‐L., Fretigny, M., Meunier, S., Zawadzki, C., Gay, V., Negrier, C., Sanlaville, D., and Vinciguerra, C.
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Unlabelled Boxce:textbox-body/
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- 2016
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30. Phenotypic spectrum and transcriptomic profile associated with germline variants in TRAF7
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Robert A. Hegele, Maria Iascone, Kevin A. Shapiro, Nicolas Chatron, Marwan Shinawi, Joel Charrow, Jeffrey W. Innis, Luitgard Graul-Neumann, Joanna Goes Castro Meira, Anna Lehman, Dawn L. Earl, Victoria R. Sanders, Shannon Rego, David A. Sweetser, Clémantine Dimartino, Wilhelmina S. Kerstjens-Frederikse, Antonio Vitobello, Davor Lessel, Daniel Grinberg, Laurence Faivre, Ryan Peretz, Katherine M. Christensen, Emma Reesor, Erin Beaver, Elizabeth Wohler, Margot R.F. Reijnders, Deborah Barbouth, Anna Cereda, Kaja Kristine Selmer, Melissa A. Walker, Barbro Stadheim, Alessandro Serretti, Helen Kingston, Jill Clayton-Smith, Raymond Lewandowski, Bernarda Lozić, Robert Stratton, Amelia Kirby, Anne H. O’Donnell-Luria, Sara Gabbiadini, Susanna Balcells, Myriam Oufadem, Christel Thauvin, Maha Aly, Wendy K. Chung, Susan M. White, Lauren C. Briere, Thomas Smol, Stanislas Lyonnet, Roberto Colombo, Catherine E. Keegan, Marie T. McDonald, Melanie Parisot, Tiong Yang Tan, Brian Wong, Christopher T. Gordon, Magnus Dehli Vigeland, Frances A. High, Emily Bryant, Audrey Labalme, Nara Sobreira, Arnold Munnich, Jeanne Amiel, Dayna Morel Swols, Raquel Rabionet, Laura Castilla-Vallmanya, Jennifer Heeley, Gunnar Houge, Michael J. Gambello, Bernardo Blanco-Sánchez, Lynn Pais, Olena M. Vaske, Roser Urreizti, Alison Wray, Veronique Pingault, Damien Sanlaville, John Christodoulou, John Millichap, Valérie Cormier-Daire, Parul Jayakar, Helen Cox, Frédéric Tran Mau-Them, Belinda Chong, Victoria Mok Siu, Anne Slavotinek, Antonie J. van Essen, Ingvild Aukrust, Lorne A. Clarke, Rachel Gannaway, Anne Dieux-Coeslier, Patrick Nitschké, Tony Yao, Simon Sadedin, Danielle Karlowicz, Christelle Rougeot, Christine Bole-Feysot, Sandra Yang, Megan T. Cho, Gaetan Lesca, Christiane Zweier, Castilla-Vallmanya L., Selmer K.K., Dimartino C., Rabionet R., Blanco-Sanchez B., Yang S., Reijnders M.R.F., van Essen A.J., Oufadem M., Vigeland M.D., Stadheim B., Houge G., Cox H., Kingston H., Clayton-Smith J., Innis J.W., Iascone M., Cereda A., Gabbiadini S., Chung W.K., Sanders V., Charrow J., Bryant E., Millichap J., Vitobello A., Thauvin C., Mau-Them F.T., Faivre L., Lesca G., Labalme A., Rougeot C., Chatron N., Sanlaville D., Christensen K.M., Kirby A., Lewandowski R., Gannaway R., Aly M., Lehman A., Clarke L., Graul-Neumann L., Zweier C., Lessel D., Lozic B., Aukrust I., Peretz R., Stratton R., Smol T., Dieux-Coeslier A., Meira J., Wohler E., Sobreira N., Beaver E.M., Heeley J., Briere L.C., High F.A., Sweetser D.A., Walker M.A., Keegan C.E., Jayakar P., Shinawi M., Kerstjens-Frederikse W.S., Earl D.L., Siu V.M., Reesor E., Yao T., Hegele R.A., Vaske O.M., Rego S., Shapiro K.A., Wong B., Gambello M.J., McDonald M., Karlowicz D., Colombo R., Serretti A., Pais L., O'Donnell-Luria A., Wray A., Sadedin S., Chong B., Tan T.Y., Christodoulou J., White S.M., Slavotinek A., Barbouth D., Morel Swols D., Parisot M., Bole-Feysot C., Nitschke P., Pingault V., Munnich A., Cho M.T., Cormier-Daire V., Balcells S., Lyonnet S., Grinberg D., Amiel J., Urreizti R., Gordon C.T., MUMC+: DA KG Polikliniek (9), and RS: FHML non-thematic output
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0301 basic medicine ,NF-KAPPA-B ,PROTEIN ,030105 genetics & heredity ,medicine.disease_cause ,Germline ,Transcriptome ,ACTIVATION ,POLYUBIQUITINATION ,Missense mutation ,Exome ,Genetics (clinical) ,Genetics ,Sanger sequencing ,Mutation ,leads ,Necrosi ,craniofacial development ,Phenotype ,Tumor Necrosis Factor Receptor-Associated Peptides and Proteins ,intellectual disability ,patent ductus arteriosu ,symbols ,Mutation, Missense ,Biology ,traf7 ,Article ,akt1 ,target ,03 medical and health sciences ,symbols.namesake ,Necrosis ,patent ductus arteriosus ,medicine ,Humans ,blepharophimosi ,Tumors ,MUTATIONS ,Fibroblasts ,medicine.disease ,Blepharophimosis ,TRAF7 ,blepharophimosis ,GENOMIC ANALYSIS ,Germ Cells ,030104 developmental biology ,MENINGIOMAS - Abstract
PURPOSE: Somatic variants in tumor necrosis factor receptor-associated factor 7 (TRAF7) cause meningioma, while germline variants have recently been identified in seven patients with developmental delay and cardiac, facial, and digital anomalies. We aimed to define the clinical and mutational spectrum associated with TRAF7 germline variants in a large series of patients, and to determine the molecular effects of the variants through transcriptomic analysis of patient fibroblasts.METHODS: We performed exome, targeted capture, and Sanger sequencing of patients with undiagnosed developmental disorders, in multiple independent diagnostic or research centers. Phenotypic and mutational comparisons were facilitated through data exchange platforms. Whole-transcriptome sequencing was performed on RNA from patient- and control-derived fibroblasts.RESULTS: We identified heterozygous missense variants in TRAF7 as the cause of a developmental delay-malformation syndrome in 45 patients. Major features include a recognizable facial gestalt (characterized in particular by blepharophimosis), short neck, pectus carinatum, digital deviations, and patent ductus arteriosus. Almost all variants occur in the WD40 repeats and most are recurrent. Several differentially expressed genes were identified in patient fibroblasts.CONCLUSION: We provide the first large-scale analysis of the clinical and mutational spectrum associated with the TRAF7 developmental syndrome, and we shed light on its molecular etiology through transcriptome studies.
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- 2020
31. Variants in the degron of AFF3 are associated with intellectual disability, mesomelic dysplasia, horseshoe kidney, and epileptic encephalopathy
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Rhonda E. Schnur, Fabio Sirchia, Olga Levchenko, Caroline Nava, Jane Juusola, Sarah Verheyen, Marketa Vlckova, Lindsay Rhodes, Gregory M. Cooper, Darina Prchalova, Thomas Courtin, Øystein L. Holla, David Kronn, Akemi J. Tanaka, E. Martina Bebin, Tara Funari, Miroslava Hancarova, Ennio Del Giudice, Nicolas Guex, Astrid Eisenkölbl, Dawn L. Earl, Toshiki Takenouchi, Ursula Gruber-Sedlmayr, Sedlácek Z, Sofia Douzgou, Heidelis A. Seebacher, Gerarda Cappuccio, Jasmin Blatterer, Anna Mikhaleva, Dian Donnai, Wendy K. Chung, Else Merckoll, Natasha J Brown, Elizabeth A. Sellars, Stefan Mundlos, Susan M. Hiatt, Giuliana Giannuzzi, Sinje Geuer, Giuseppina Vitiello, Séverine Lorrain, Alexandre Reymond, David J. Amor, Nicolas Chatron, Julien Delafontaine, Martine Doco, Kristian Tveten, Cecilie F. Rustad, Sylvain Pradervand, Delphine Héron, Alfredo Brusco, Elena L. Dadali, Nicola Brunetti-Pierri, Boris Keren, Yuri A. Zarate, Crystle Lee, Joel Charrow, Binnaz Yalcin, Heidi Taska-Tench, Elin Tønne, Tomoko Uehara, Alexander Lavrov, Jennifer Norman, Norine Voisin, Anna C.E. Hurst, Victoria R. Sanders, Ganka Douglas, Diana Johnson, Kenjiro Kosaki, Université de Lausanne = University of Lausanne (UNIL), Cooper Medical School of Rowan University [Camden] (CMSRU), Manchester University NHS Foundation Trust (MFT), University of Manchester [Manchester], HudsonAlpha Institute for Biotechnology [Huntsville, AL], Oslo University Hospital [Oslo], Victorian Clinical Genetics Services [Melbourne, VIC, Australia] (VCGS), Murdoch Children's Research Institute (MCRI), University of Melbourne, Seattle Children’s Hospital, Groupe de Recherche Clinique : Déficience Intellectuelle et Autisme [ CHU Pitié-Salpêtrière AP-HP] (GRC : DIA), Université Pierre et Marie Curie - Paris 6 (UPMC)-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), Research Centre for Medical Genetics [Moscow, Russia] (RCMG), Max Planck Institute for Molecular Genetics (MPIMG), Max-Planck-Gesellschaft, Medical University of Graz, Sheffield Children's NHS Foundation Trust, University of Arkansas at Little Rock, Charles University [Prague] (CU), University Hospital Motol [Prague], University of Alabama at Birmingham [ Birmingham] (UAB), Università degli studi di Torino = University of Turin (UNITO), Azienda Ospedalerio - Universitaria Città della Salute e della Scienza di Torino = University Hospital Città della Salute e della Scienza di Torino, University of Naples Federico II = Università degli studi di Napoli Federico II, Ann & Robert H. Lurie Children's Hospital of Chicago, Swiss Institute of Bioinformatics [Lausanne] (SIB), Hémostase et Remodelage Vasculaire Post-Ischémie (HERVI - EA 3801), Université de Reims Champagne-Ardenne (URCA), GeneDx [Gaithersburg, MD, USA], Johannes Kepler University Linz [Linz] (JKU), Telemark Hospital Trust [Skien, Norway], New York Medical College (NYMC), Integris Pediatric Neurology [Oklahoma City, OK, USA] (IPN), Institute for Maternal and Child Health - IRCCS 'Burlo Garofolo' [Trieste], Keio University School of Medicine [Tokyo, Japan], Columbia University [New York], 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), Manchester Centre for Genomic Medicine [Manchester, UK] (MCGM), St Mary's Hospital Manchester-Manchester Academic Health Science Centre (MAHSC), University of Manchester [Manchester]-University of Manchester [Manchester]-Manchester University NHS Foundation Trust (MFT)-Faculty of Biology, Medicine and Health [Manchester, UK], Charité - UniversitätsMedizin = Charité - University Hospital [Berlin], Dupuis, Christine, Voisin, N., Schnur, R. E., Douzgou, S., Hiatt, S. M., Rustad, C. F., Brown, N. J., Earl, D. L., Keren, B., Levchenko, O., Geuer, S., Verheyen, S., Johnson, D., Zarate, Y. A., Hancarova, M., Amor, D. J., Bebin, E. M., Blatterer, J., Brusco, A., Cappuccio, G., Charrow, J., Chatron, N., Cooper, G. M., Courtin, T., Dadali, E., Delafontaine, J., Del Giudice, E., Doco, M., Douglas, G., Eisenkolbl, A., Funari, T., Giannuzzi, G., Gruber-Sedlmayr, U., Guex, N., Heron, D., Holla, O. L., Hurst, A. C. E., Juusola, J., Kronn, D., Lavrov, A., Lee, C., Lorrain, S., Merckoll, E., Mikhaleva, A., Norman, J., Pradervand, S., Prchalova, D., Rhodes, L., Sanders, V. R., Sedlacek, Z., Seebacher, H. A., Sellars, E. A., Sirchia, F., Takenouchi, T., Tanaka, A. J., Taska-Tench, H., Tonne, E., Tveten, K., Vitiello, G., Vlckova, M., Uehara, T., Nava, C., Yalcin, B., Kosaki, K., Donnai, D., Mundlos, S., Brunetti Pierri, N., Chung, W. K., and Reymond, A.
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Male ,Models, Molecular ,Hypertrichosis ,[SDV]Life Sciences [q-bio] ,Mesomelic Dysplasia ,Transcriptome ,Mice ,Gene Frequency ,Missense mutation ,Child ,Zebrafish ,Genetics (clinical) ,Genetics ,Brain Diseases ,0303 health sciences ,biology ,Protein Stability ,030305 genetics & heredity ,AFF3 ,AFF4 ,horseshoe kidney ,intellectual disability ,mesomelic dysplasia ,Nuclear Proteins ,Syndrome ,Phenotype ,Ubiquitin ligase ,[SDV] Life Sciences [q-bio] ,Child, Preschool ,Female ,Transcriptional Elongation Factors ,Adolescent ,Mutation, Missense ,Osteochondrodysplasias ,Article ,Evolution, Molecular ,Young Adult ,03 medical and health sciences ,medicine ,Animals ,Humans ,Amino Acid Sequence ,Fused Kidney ,030304 developmental biology ,Epilepsy ,Infant ,Horseshoe kidney ,biology.organism_classification ,medicine.disease ,biology.protein - Abstract
International audience; The ALF transcription factor paralogs, AFF1, AFF2, AFF3, and AFF4, are components of the transcriptional super elongation complex that regulates expression of genes involved in neurogenesis and development. We describe an autosomal dominant disorder associated with de novo missense variants in the degron of AFF3, a nine amino acid sequence important for its binding to ubiquitin ligase, or with de novo deletions of this region. The sixteen affected individuals we identified, along with two previously reported individuals, present with a recognizable pattern of anomalies, which we named KINSSHIP syndrome (KI for horseshoe kidney, NS for Nievergelt/Savarirayan type of mesomelic dysplasia, S for seizures, H for hypertrichosis, I for intellectual disability, and P for pulmonary involvement), partially overlapping the AFF4-associated CHOPS syndrome. Whereas homozygous Aff3 knockout mice display skeletal anomalies, kidney defects, brain malformations, and neurological anomalies, knockin animals modeling one of the microdeletions and the most common of the missense variants identified in affected individuals presented with lower mesomelic limb deformities like KINSSHIP-affected individuals and early lethality, respectively. Overexpression of AFF3 in zebrafish resulted in body axis anomalies, providing some support for the pathological effect of increased amount of AFF3. The only partial phenotypic overlap of AFF3-and AFF4-associated syndromes and the previously published transcriptome analyses of ALF transcription factors suggest that these factors are not redundant and each contributes uniquely to proper development.
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- 2021
32. Clinical and genetic delineation of autosomal recessive and dominant ACTL6B-related developmental brain disorders.
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Cali E, Quirin T, Rocca C, Efthymiou S, Riva A, Marafi D, Zaki MS, Suri M, Dominguez R, Elbendary HM, Alavi S, Abdel-Hamid MS, Morsy H, Mau-Them FT, Nizon M, Tesner P, Ryba L, Zafar F, Rana N, Saadi NW, Firoozfar Z, Gencpinar P, Unay B, Ustun C, Bruel AL, Coubes C, Stefanich J, Sezer O, Agolini E, Novelli A, Vasco G, Lettori D, Milh M, Villard L, Zeidler S, Opperman H, Strehlow V, Issa MY, El Khassab H, Chand P, Ibrahim S, Nejad-Rashidi A, Miryounesi M, Larki P, Morrison J, Cristian I, Thiffault I, Bertsch NL, Noh GJ, Pappas J, Moran E, Marinakis NM, Traeger-Synodinos J, Hosseini S, Abbaszadegan MR, Caumes R, Vissers LELM, Neshatdoust M, Montazer MZ, El Fahime E, Canavati C, Kamal L, Kanaan M, Askander O, Voinova V, Levchenko O, Haider S, Halbach SS, Maia ER, Mansoor S, Vivek J, Tawde S, Santhosh R Challa V, Gowda VK, Srinivasan VM, Victor LA, Pinero-Banos B, Hague J, Ei-Awady HA, Maria de Miranda Henriques-Souza A, Cheema HA, Anjum MN, Idkaidak S, Alqarajeh F, Atawneh O, Mor-Shaked H, Harel T, Zifarelli G, Bauer P, Kok F, Kitajima JP, Monteiro F, Josahkian J, Lesca G, Chatron N, Ville D, Murphy D, Neul JL, Mullegama SV, Begtrup A, Herman I, Mitani T, Posey JE, Tay CG, Javed I, Carr L, Kanani F, Beecroft F, Hane L, Abdelkreem E, Macek M, Bispo L, Elmaksoud MA, Hashemi-Gorji F, Pehlivan D, Amor DJ, Jamra RA, Chung WK, Ghayoor EK, Campeau P, Alkuraya FS, Pagnamenta AT, Gleeson J, Lupski JR, Striano P, Moreno-De-Luca A, Lafontaine DLJ, Houlden H, and Maroofian R
- Abstract
Purpose: This study aims to comprehensively delineate the phenotypic spectrum of ACTL6B-related disorders, previously associated with both autosomal recessive and autosomal dominant neurodevelopmental disorders. Molecularly, the role of the nucleolar protein ACTL6B in contributing to the disease has remained unclear., Methods: We identified 105 affected individuals, including 39 previously reported cases, and systematically analysed detailed clinical and genetic data for all individuals. Additionally, we conducted knockdown experiments in neuronal cells to investigate the role of ACTL6B in ribosome biogenesis., Results: Biallelic variants in ACTL6B are associated with severe-to-profound global developmental delay/intellectual disability (GDD/ID), infantile intractable seizures, absent speech, autistic features, dystonia, and increased lethality. De novo monoallelic variants result in moderate-to-severe GDD/ID, absent speech, and autistic features, while seizures and dystonia were less frequently observed. Dysmorphic facial features and brain abnormalities, including hypoplastic corpus callosum, parenchymal volume loss/atrophy, are common findings in both groups. We reveal that in the nucleolus, ACTL6B plays a crucial role in ribosome biogenesis, in particular in pre-rRNA processing., Conclusion: This study provides a comprehensive characterization of the clinical spectrum of both autosomal recessive and dominant forms of ACTL6B-associated disorders. It offers a comparative analysis of their respective phenotypes provides a plausible molecular explanation and suggests their inclusion within the expanding category of 'ribosomopathies'., (Copyright © 2024. Published by Elsevier Inc.)
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- 2024
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33. Familial severe skeletal Class II malocclusion with gingival hyperplasia caused by a complex structural rearrangement at the KCNJ2-KCNJ16 locus.
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Maroofian R, Pagnamenta AT, Navabazam A, Schwessinger R, Roberts HE, Lopopolo M, Dehghani M, Vahidi Mehrjardi MY, Haerian A, Soltanianzadeh M, Noori Kooshki MH, Knight SJ, Miller KA, McGowan SJ, Chatron N, Timberlake AT, Melo US, Mundlos S, Buck D, Twigg SR, Taylor JC, Wilkie AO, and Calpena E
- Abstract
The aim of this work was to identify the underlying genetic cause in a four-generation family segregating an unusual phenotype comprising a severe form of skeletal Class II malocclusion with gingival hyperplasia. SNP-array identified a copy number gain on chr1, however this chromosomal region did not segregate correctly in the extended family. Exome sequencing also failed to identify a candidate causative variant, but highlighted co-segregating genetic markers on chr17 and chr19. Short- and long-read genome sequencing allowed us to pinpoint and characterize at nucleotide-level resolution a chromothripsis-like complex rearrangement (CR) inserted into the chr17 co-segregating region at the KCNJ2-SOX9 locus. The CR involved the gain of five different regions from chr1 that are shuffled, chained and inserted as a single block (∼828 kb) at chr17q24.3. The inserted sequences contain craniofacial enhancers that are predicted to interact with KCNJ2/KCNJ16 through neo-topologically associating domain (TAD) formation to induce ectopic activation. Our findings suggest that the CR inserted at chr17q24.3 is the cause of the severe skeletal Class II malocclusion with gingival hyperplasia in this family and expands the panoply of phenotypes linked to variation at the KCNJ2-SOX9 locus. In addition, we highlight a previously overlooked potential role for misregulation of the KCNJ2/KCNJ16 genes in the pathomechanism of gingival hyperplasia associated with deletions and other rearrangements of the 17q24.2-q24.3 region (MIM 135400)., (Copyright © 2024. Published by Elsevier Inc.)
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- 2024
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34. Possible incomplete penetrance of Xq28 int22h-1/int22h-2 duplication.
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Billes A, Pujalte M, Jedraszak G, Amsallem D, Boudry-Labis E, Boute O, Bouquillon S, Brischoux-Boucher E, Callier P, Coutton C, Denizet AA, Dieterich K, Kuentz P, Lespinasse J, Mazel B, Morin G, Amram F, Pennamen P, Rio M, Piard J, Putoux A, Rama M, Roze-Guillaumey V, Schluth-Bolard C, Till M, Trouvé C, Vieville G, Rooryck C, Sanlaville D, and Chatron N
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- Humans, Male, Female, Child, Adult, Adolescent, Child, Preschool, Phenotype, Chromosome Duplication genetics, Gene Duplication, Pedigree, Young Adult, Penetrance, Chromosomes, Human, X genetics, Intellectual Disability genetics
- Abstract
Xq28 int22h-1/int22h-2 duplication is the result of non-allelic homologous recombination between int22h-1/int22h-2 repeats separated by 0.5 Mb. It is responsible for a syndromic form of intellectual disability (ID), with recurrent infections and atopic diseases. Minor defects, nonspecific facial dysmorphic features, and overweight have also been described. Half of female carriers have been reported with ID, whereas all reported evaluated born males present mild to moderate ID, suggesting complete penetrance. We collected data on 15 families from eight university hospitals. Among them, 40 patients, 21 females (one fetus), and 19 males (two fetuses), were carriers of typical or atypical Xq28 int22h-1/int22h-2 duplication. Twenty-one individuals were considered asymptomatic (16 females and 5 males), without significantly higher rate of recurrent infections, atopia, overweight, or facial dysmorphism. Approximately 67% live-born males and 23% live-born female carriers of the typical duplication did not have obvious signs of intellectual disability, suggesting previously undescribed incomplete penetrance or low expression in certain carriers. The possibility of a second-hit or modifying factors to this possible susceptibility locus is yet to be studied but a possible observational bias should be considered in assessing such challenging X-chromosome copy number gains. Additional segregation studies should help to quantify this newly described incomplete penetrance., (© 2024 The Authors. Clinical Genetics published by John Wiley & Sons Ltd.)
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- 2024
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35. Expectations, needs and mid-term outcomes in people accessing to secondary findings from ES: 1st French mixed study (FIND Study).
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Viora-Dupont E, Robert F, Chassagne A, Pélissier A, Staraci S, Sanlaville D, Edery P, Lesca G, Putoux A, Pons L, Cadenes A, Baurand A, Sawka C, Bertolone G, Spetchian M, Yousfi M, Salvi D, Gautier E, Vitobello A, Denommé-Pichon AS, Bruel AL, Tran Mau-Them F, Faudet A, Keren B, Labalme A, Chatron N, Abel C, Dupuis-Girod S, Poisson A, Buratti J, Mignot C, Afenjar A, Whalen S, Charles P, Heide S, Mouthon L, Moutton S, Sorlin A, Nambot S, Briffaut AS, Asensio ML, Philippe C, Thauvin-Robinet C, Héron D, Rossi M, Meunier-Bellard N, Gargiulo M, Peyron C, Binquet C, and Faivre L
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- Humans, Female, Male, Adult, Exome Sequencing, France, Parents psychology, Child, Genetic Testing, Incidental Findings, Adolescent, Developmental Disabilities genetics, Developmental Disabilities psychology, Developmental Disabilities diagnosis, Child, Preschool, Genetic Counseling psychology
- Abstract
Generation and subsequently accessibility of secondary findings (SF) in diagnostic practice is a subject of debate around the world and particularly in Europe. The French FIND study has been set up to assess patient/parent expectations regarding SF from exome sequencing (ES) and to collect their real-life experience until 1 year after the delivery of results. 340 patients who had ES for undiagnosed developmental disorders were included in this multicenter mixed study (quantitative N = 340; qualitative N = 26). Three groups of actionable SF were rendered: predisposition to late-onset actionable diseases; genetic counseling; pharmacogenomics. Participants expressed strong interest in obtaining SF and a high satisfaction level when a SF is reported. The medical actionability of the SF reinforced parents' sense of taking action for their child and was seen as an opportunity. While we observed no serious psychological concerns, we showed that these results could have psychological consequences, in particular for late-onset actionable diseases SF, within families already dealing with rare diseases. This study shows that participants remain in favor of accessing SF despite the potential psychological, care, and lifestyle impacts, which are difficult to anticipate. The establishment of a management protocol, including the support of a multidisciplinary team, would be necessary if national policy allows the reporting of these data., (© 2024. The Author(s).)
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- 2024
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36. Expanding the genetic and clinical spectrum of Tatton-Brown-Rahman syndrome in a series of 24 French patients.
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Thomas H, Alix T, Renard É, Renaud M, Wourms J, Zuily S, Leheup B, Geneviève D, Dreumont N, Schmitt E, Bronner M, Muller M, Divoux M, Wandzel M, Ravel JM, Dexheimer M, Becker A, Roth V, Willems M, Coubes C, Vieville G, Devillard F, Schaefer É, Baer S, Piton A, Gérard B, Vincent M, Nizon M, Cogné B, Ruaud L, Couque N, Putoux A, Edery P, Lesca G, Chatron N, Till M, Faivre L, Tran-Mau-Them F, Alessandri JL, Lebrun M, Quélin C, Odent S, Dubourg C, David V, Faoucher M, Mignot C, Keren B, Pisan É, Afenjar A, Julia S, Bieth É, Banneau G, Goldenberg A, Husson T, Campion D, Lecoquierre F, Nicolas G, Charbonnier C, De Saint Martin A, Naudion S, Degoutin M, Rondeau S, Michot C, Cormier-Daire V, Oussalah A, Pourié C, Lambert L, and Bonnet C
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- Humans, Male, Female, France epidemiology, Child, Child, Preschool, Adolescent, Germ-Line Mutation genetics, Adult, Phenotype, Young Adult, Growth Disorders genetics, Growth Disorders pathology, Infant, DNA Methyltransferase 3A, Intellectual Disability genetics, Intellectual Disability pathology, DNA (Cytosine-5-)-Methyltransferases genetics
- Abstract
Background: Tatton-Brown-Rahman syndrome (TBRS; OMIM 615879), also known as DNA methyltransferase 3 alpha ( DNMT3A )-overgrowth syndrome (DOS), was first described by Tatton-Brown in 2014. This syndrome is characterised by overgrowth, intellectual disability and distinctive facial features and is the consequence of germline loss-of-function variants in DNMT3A , which encodes a DNA methyltransferase involved in epigenetic regulation. Somatic variants of DNMT3A are frequently observed in haematological malignancies, including acute myeloid leukaemia (AML). To date, 100 individuals with TBRS with de novo germline variants have been described. We aimed to further characterise this disorder clinically and at the molecular level in a nationwide series of 24 French patients and to investigate the correlation between the severity of intellectual disability and the type of variant., Methods: We collected genetic and medical information from 24 individuals with TBRS using a questionnaire released through the French National AnDDI-Rares Network., Results: Here, we describe the first nationwide French cohort of 24 individuals with germline likely pathogenic/pathogenic variants in DNMT3A , including 17 novel variants. We confirmed that the main phenotypic features were intellectual disability (100% of individuals), distinctive facial features (96%) and overgrowth (87%). We highlighted novel clinical features, such as hypertrichosis, and further described the neurological features and EEG results., Conclusion: This study of a nationwide cohort of individuals with TBRS confirms previously published data and provides additional information and clarifies clinical features to facilitate diagnosis and improve care. This study adds value to the growing body of knowledge on TBRS and broadens its clinical and molecular spectrum., Competing Interests: Competing interests: None declared., (© Author(s) (or their employer(s)) 2024. No commercial re-use. See rights and permissions. Published by BMJ.)
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- 2024
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37. Diagnostic utility of DNA methylation analysis in genetically unsolved pediatric epilepsies and CHD2 episignature refinement.
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LaFlamme CW, Rastin C, Sengupta S, Pennington HE, Russ-Hall SJ, Schneider AL, Bonkowski ES, Almanza Fuerte EP, Allan TJ, Zalusky MP, Goffena J, Gibson SB, Nyaga DM, Lieffering N, Hebbar M, Walker EV, Darnell D, Olsen SR, Kolekar P, Djekidel MN, Rosikiewicz W, McConkey H, Kerkhof J, Levy MA, Relator R, Lev D, Lerman-Sagie T, Park KL, Alders M, Cappuccio G, Chatron N, Demain L, Genevieve D, Lesca G, Roscioli T, Sanlaville D, Tedder ML, Gupta S, Jones EA, Weisz-Hubshman M, Ketkar S, Dai H, Worley KC, Rosenfeld JA, Chao HT, Neale G, Carvill GL, Wang Z, Berkovic SF, Sadleir LG, Miller DE, Scheffer IE, Sadikovic B, and Mefford HC
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- Humans, Female, Child, Male, Child, Preschool, DNA-Binding Proteins genetics, Adolescent, Genetic Testing methods, Infant, DNA Methylation genetics, Epilepsy genetics, Epilepsy diagnosis, DNA Copy Number Variations genetics
- Abstract
Sequence-based genetic testing identifies causative variants in ~ 50% of individuals with developmental and epileptic encephalopathies (DEEs). Aberrant changes in DNA methylation are implicated in various neurodevelopmental disorders but remain unstudied in DEEs. We interrogate the diagnostic utility of genome-wide DNA methylation array analysis on peripheral blood samples from 582 individuals with genetically unsolved DEEs. We identify rare differentially methylated regions (DMRs) and explanatory episignatures to uncover causative and candidate genetic etiologies in 12 individuals. Using long-read sequencing, we identify DNA variants underlying rare DMRs, including one balanced translocation, three CG-rich repeat expansions, and four copy number variants. We also identify pathogenic variants associated with episignatures. Finally, we refine the CHD2 episignature using an 850 K methylation array and bisulfite sequencing to investigate potential insights into CHD2 pathophysiology. Our study demonstrates the diagnostic yield of genome-wide DNA methylation analysis to identify causal and candidate variants as 2% (12/582) for unsolved DEE cases., (© 2024. The Author(s).)
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- 2024
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38. Expanding the Mutational Landscape and Clinical Phenotype of CHD2-Related Encephalopathy.
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Clara-Hwang A, Stefani S, Lau T, Scala M, Aynekin B, Bernardo P, Madia F, Bakhtadze S, Kaiyrzhanov R, Maroofian R, Zara F, Srinivasan VM, Gowda V, Guliyeva U, Montavont A, Poulat AL, Güleç A, Berger C, Ville DM, de Bellescize J, Cabet S, Wonneberger A, Schulz A, Rodriguez-Palmero A, Chatron N, Lesca G, Per H, Goel H, Brown J, Frey T, Steindl K, Rauch A, Severino M, Houlden H, Nicolaides P, Striano P, and Efthymiou S
- Abstract
Objectives: To present a case series of novel CHD2 variants in patients presenting with genetic epileptic and developmental encephalopathy., Background: CHD2 gene encodes an ATP-dependent enzyme, chromodomain helicase DNA-binding protein 2, involved in chromatin remodeling. Pathogenic variants in CHD2 are linked to early-onset conditions such as developmental and epileptic encephalopathy, drug-resistant epilepsies, and neurodevelopmental disorders. Approximately 225 diagnosed patients from 28 countries exhibit various allelic variants in CHD2, including small intragenic deletions/insertions and missense, nonsense, and splice site variants., Results: We present the molecular and clinical characteristics of 17 unreported individuals from 17 families with novel pathogenic or likely pathogenic variants in CHD2 . All individuals presented with severe global developmental delay, childhood-onset myoclonic epilepsy, and additional neuropsychiatric features, such as behavioral including autism, ADHD, and hyperactivity. Additional findings include abnormal reflexes, hypotonia and hypertonia, motor impairment, gastrointestinal problems, and kyphoscoliosis. Neuroimaging features included hippocampal signal alterations (4/10), with additional volume loss in 2 cases, inferior vermis hypoplasia (7/10), mild cerebellar atrophy (4/10), and cerebral atrophy (1/10)., Discussion: Our study broadens the geographic scope of CHD2-related phenotypes, providing valuable insights into the prevalence and clinical characteristics of this genetic disorder in previously underrepresented populations., Competing Interests: P. Striano received support from Italian MoH (Ricerca Corrente 2023) and Fondazione San Paolo. Research supported by PNRR-MUR-M4C2 PE0000006 Research Program MNESYS—A multiscale integrated approach to the study of the nervous system in health and disease. IRCCS G. Gaslini is a member of ERN-Epicare. Go to Neurology.org/NG for full disclosures., (Copyright © 2024 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Neurology.)
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- 2024
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39. MSL2 variants lead to a neurodevelopmental syndrome with lack of coordination, epilepsy, specific dysmorphisms, and a distinct episignature.
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Karayol R, Borroto MC, Haghshenas S, Namasivayam A, Reilly J, Levy MA, Relator R, Kerkhof J, McConkey H, Shvedunova M, Petersen AK, Magnussen K, Zweier C, Vasileiou G, Reis A, Savatt JM, Mulligan MR, Bicknell LS, Poke G, Abu-El-Haija A, Duis J, Hannig V, Srivastava S, Barkoudah E, Hauser NS, van den Born M, Hamiel U, Henig N, Baris Feldman H, McKee S, Krapels IPC, Lei Y, Todorova A, Yordanova R, Atemin S, Rogac M, McConnell V, Chassevent A, Barañano KW, Shashi V, Sullivan JA, Peron A, Iascone M, Canevini MP, Friedman J, Reyes IA, Kierstein J, Shen JJ, Ahmed FN, Mao X, Almoguera B, Blanco-Kelly F, Platzer K, Treu AB, Quilichini J, Bourgois A, Chatron N, Januel L, Rougeot C, Carere DA, Monaghan KG, Rousseau J, Myers KA, Sadikovic B, Akhtar A, and Campeau PM
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- Adolescent, Child, Child, Preschool, Female, Humans, Male, Developmental Disabilities genetics, DNA Methylation genetics, Epigenesis, Genetic, Histones metabolism, Histones genetics, Induced Pluripotent Stem Cells metabolism, Intellectual Disability genetics, Phenotype, Epilepsy genetics, Neurodevelopmental Disorders genetics, Ubiquitin-Protein Ligases metabolism
- Abstract
Epigenetic dysregulation has emerged as an important etiological mechanism of neurodevelopmental disorders (NDDs). Pathogenic variation in epigenetic regulators can impair deposition of histone post-translational modifications leading to aberrant spatiotemporal gene expression during neurodevelopment. The male-specific lethal (MSL) complex is a prominent multi-subunit epigenetic regulator of gene expression and is responsible for histone 4 lysine 16 acetylation (H4K16ac). Using exome sequencing, here we identify a cohort of 25 individuals with heterozygous de novo variants in MSL complex member MSL2. MSL2 variants were associated with NDD phenotypes including global developmental delay, intellectual disability, hypotonia, and motor issues such as coordination problems, feeding difficulties, and gait disturbance. Dysmorphisms and behavioral and/or psychiatric conditions, including autism spectrum disorder, and to a lesser extent, seizures, connective tissue disease signs, sleep disturbance, vision problems, and other organ anomalies, were observed in affected individuals. As a molecular biomarker, a sensitive and specific DNA methylation episignature has been established. Induced pluripotent stem cells (iPSCs) derived from three members of our cohort exhibited reduced MSL2 levels. Remarkably, while NDD-associated variants in two other members of the MSL complex (MOF and MSL3) result in reduced H4K16ac, global H4K16ac levels are unchanged in iPSCs with MSL2 variants. Regardless, MSL2 variants altered the expression of MSL2 targets in iPSCs and upon their differentiation to early germ layers. Our study defines an MSL2-related disorder as an NDD with distinguishable clinical features, a specific blood DNA episignature, and a distinct, MSL2-specific molecular etiology compared to other MSL complex-related disorders., Competing Interests: Declaration of interests B.S. is a shareholder in EpiSign Inc, involved in commercial uses of EpiSign(TM) technology D.A.C. and K.G.M. are employees of GeneDx, LLC., (Copyright © 2024. Published by Elsevier Inc.)
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- 2024
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40. Prenatal diagnosis of SLC25A24 Fontaine progeroid syndrome: description of the fetal phenotype, genotype and detection of parental mosaicism.
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Pannier E, Sekri A, Roux N, Vasiljevic A, El Khattabi L, Chatron N, Grotto S, Menzella D, Grangé G, Thébault F, Massardier J, Fourrage C, Lohmann L, Tsatsaris V, Putoux A, Boutaud L, and Attié-Bitach T
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- Adult, Female, Humans, Male, Pregnancy, Antiporters, Calcium-Binding Proteins, Fetus, Genotype, Mitochondrial Proteins genetics, Mutation genetics, Mosaicism embryology, Phenotype, Prenatal Diagnosis methods, Progeria genetics
- Abstract
Background: Fontaine progeroid syndrome (FPS, OMIM 612289) is a recently identified genetic disorder stemming from pathogenic variants in the SLC25A24 gene, encoding a mitochondrial carrier protein. It encompasses Gorlin-Chaudry-Moss syndrome and Fontaine-Farriaux syndrome, primarily manifesting as craniosynostosis with brachycephaly, distinctive dysmorphic facial features, hypertrichosis, severe prenatal and postnatal growth restriction, limb shortening, and early aging with characteristic skin changes, phalangeal anomalies, and genital malformations., Cases: All known occurrences of FPS have been postnatally observed until now. Here, we present the first two prenatal cases identified during the second trimester of pregnancy. While affirming the presence of most postnatal abnormalities in prenatal cases, we note the absence of a progeroid appearance in young fetuses. Notably, our reports introduce new phenotypic features like encephalocele and nephromegaly, which were previously unseen postnatally. Moreover, paternal SLC25A24 mosaicism was detected in one case., Conclusions: We present the initial two fetal instances of FPS, complemented by thorough phenotypic and genetic assessments. Our findings expand the phenotypical spectrum of FPS, unveiling new fetal phenotypic characteristics. Furthermore, one case underscores a potential novel inheritance pattern in this disorder. Lastly, our observations emphasize the efficacy of exome/genome sequencing in both prenatal and postmortem diagnosis of rare polymalformative syndromes with a normal karyotype and array-based comparative genomic hybridization (CGH)., (© 2024 The Author(s). Birth Defects Research published by Wiley Periodicals LLC.)
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- 2024
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41. Clinical and molecular cytogenetic studies of five new patients with 20q11q12 deletion and review of the literature: Proposition of two critical regions.
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Bensaid S, Bendahmane M, Loddo S, Poke G, Januel L, Nicolle R, Malan V, Chatron N, Ottombrino S, Dentici ML, Novelli A, Digilio MC, and Sanlaville D
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- Child, Child, Preschool, Female, Humans, Male, Abnormalities, Multiple genetics, Abnormalities, Multiple pathology, DNA Copy Number Variations genetics, Phenotype, Adolescent, Chromosome Deletion, Chromosomes, Human, Pair 20 genetics
- Abstract
Deletions of the long arm of chromosome 20 (20q) are rare, with only 16 reported patients displaying a proximal interstitial 20q deletion. A 1.62 Mb minimal critical region at 20q11.2, encompassing three genes GDF5, EPB41L1, and SAMHD1, is proposed to be responsible for this syndrome. The leading clinical features include growth retardation, intractable feeding difficulties with gastroesophageal reflux, hypotonia and psychomotor developmental delay. Common facial dysmorphisms including triangular face, hypertelorism, and hypoplastic alae nasi were additionally reported. Here, we present the clinical and molecular findings of five new patients with proximal interstitial 20q deletions. We analyzed the phenotype and molecular data of all previously reported patients with 20q11.2q12 microdeletions, along with our five new cases. Copy number variation analysis of patients in our cohort has enabled us to identify the second critical region in the 20q11.2q12 region and redefine the first region that is initially identified. The first critical region spans 359 kb at 20q11.2, containing six MIM genes, including two disease-causing genes, GDF5 and CEP250. The second critical region spans 706 kb at 20q12, encompassing four MIM genes, including two disease-causing genes, MAFB and TOP1. We propose GDF5 to be the primary candidate gene generating the phenotype of patients with 20q11.2 deletions. Moreover, we hypothesize TOP1 as a potential candidate gene for the second critical region at 20q12. Of note, we cannot exclude the possibility of a synergistic role of other genes involved in the deletion, including a contiguous gene deletion syndrome or position effect affecting both critical regions. Further studies focusing on patients with proximal 20q deletions are required to support our hypothesis., (© 2024 The Authors. American Journal of Medical Genetics Part A published by Wiley Periodicals LLC.)
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- 2024
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42. Loss of heterozygosity in CCM2 cDNA revealing a structural variant causing multiple cerebral cavernous malformations.
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Chaussenot A, Ayrignac X, Chatron N, Granchon-Riolzir T, Labauge P, Tournier-Lasserve E, and Riant F
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- Humans, Female, Male, Adult, Carrier Proteins genetics, Chromosomes, Human, Pair 7 genetics, DNA, Complementary genetics, Middle Aged, Hemangioma, Cavernous, Central Nervous System genetics, Hemangioma, Cavernous, Central Nervous System diagnosis, Hemangioma, Cavernous, Central Nervous System pathology, Loss of Heterozygosity, Pedigree
- Abstract
Loss-of-function variants in CCM1/KRIT1, CCM2/MGC4607, and CCM3/PDCD10 genes are identified in the vast majority of familial cases with multiple cerebral cavernous malformations. However, genomic DNA sequencing combined with large rearrangement screening fails to detect a pathogenic variant in 5% of the patients. We report a family with two affected members harboring multiple CCM lesions, one with severe hemorrhages and one asymptomatic. No causative variant was detected using DNA sequencing of the three CCM genes, CNV detection analysis, and RNA sequencing. However, a loss of heterozygosity in CCM2 was observed on cDNA sequences in one of the two affected members, which strongly suggested that this locus might be involved. Whole genome sequencing (WGS) identified a balanced structural variant on chromosome 7 with a breakpoint interrupting the CCM2 gene, preventing normal mRNA synthesis. These data underline the importance of WGS in undiagnosed patients with typical multiple CCM., (© 2024. The Author(s), under exclusive licence to European Society of Human Genetics.)
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- 2024
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43. Whole F8 gene sequencing identified pathogenic structural variants in the remaining unsolved patients with severe hemophilia A.
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Jourdy Y, Chatron N, Frétigny M, Zawadzki C, Lienhart A, Stieltjes N, Rohrlich PS, Thauvin-Robinet C, Volot F, Hamida YF, Hariti G, Leuci A, Dargaud Y, Sanlaville D, and Vinciguerra C
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- Humans, Male, Genetic Predisposition to Disease, Severity of Illness Index, Pedigree, Chromosomes, Human, Pair 6 genetics, DNA Mutational Analysis, Chromosomes, Human, Pair 9 genetics, Sequence Analysis, DNA, Mutation, Female, Hemophilia A genetics, Hemophilia A diagnosis, Factor VIII genetics, Introns, Chromosome Inversion, Phenotype
- Abstract
Background: No F8 genetic abnormality is detected in approximately 1% to 2% of patients with severe hemophilia A (HA) using conventional genetic approaches. In these patients, deep intronic variation or F8 disrupting genomic rearrangement could be causal., Objectives: The study aimed to identify the causal variation in families with a history of severe HA for whom genetic investigations failed., Methods: We performed whole F8 gene sequencing in 8 propositi. Genomic rearrangements were confirmed by Sanger sequencing of breakpoint junctions and/or quantitative polymerase chain reaction., Results: A structural variant disrupting F8 was found in each propositus, so that all the 815 families with a history of severe HA registered in our laboratory received a conclusive genetic diagnosis. These structural variants consisted of 3 balanced inversions, 3 large insertions of gained regions, and 1 retrotransposition of a mobile element. The 3 inversions were 105 Mb, 1.97 Mb, and 0.362 Mb in size. Among the insertions of gained regions, one corresponded to the insertion of a 34 kb gained region from chromosome 6q27 in F8 intron 6, another was the insertion of a 447 kb duplicated region from chromosome 9p22.1 in F8 intron 14, and the last one was the insertion of an Xq28 349 kb gained in F8 intron 5., Conclusion: All the genetically unsolved cases of severe HA in this cohort were due to structural variants disrupting F8. This study highlights the effectiveness of whole F8 sequencing to improve the molecular diagnosis of HA when the conventional approach fails., Competing Interests: Declaration of competing interests There are no competing interests to disclose., (Copyright © 2024 International Society on Thrombosis and Haemostasis. Published by Elsevier Inc. All rights reserved.)
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- 2024
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44. Idiopathic generalized epilepsy in a family with SCN4A-related myotonia.
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Talarico M, Fortunato F, Labalme A, Januel L, Chatron N, Sanlaville D, Sammarra I, Gagliardi M, Procopio R, Valentino P, Annesi G, Lesca G, and Gambardella A
- Subjects
- Adolescent, Adult, Female, Humans, Male, Middle Aged, Italy, Myotonia genetics, Phenotype, Electroencephalography, Epilepsy, Generalized genetics, NAV1.4 Voltage-Gated Sodium Channel genetics, Pedigree
- Abstract
Objectives: Myotonia is a clinical sign typical of a group of skeletal muscle channelopathies, the non-dystrophic myotonias. These disorders are electrophysiologically characterized by altered membrane excitability, due to specific genetic variants in known causative genes (CLCN1 and SCN4A). Juvenile Myoclonic Epilepsy (JME) is an epileptic syndrome identified as idiopathic generalized epilepsy, its genetics is complex and still unclarified. The co-occurrence of these two phenotypes is rare and the causes likely have a genetic background. In this study, we have genetically investigated an Italian family in which co-segregates myotonia, JME, or abnormal EEG without seizures was observed., Methods: All six individuals of the family, 4 affected and 2 unaffected, were clinically evaluated; EMG and EEG examinations were performed. For genetic testing, Exome Sequencing was performed for the six family members and Sanger sequencing was used to confirm the candidate variant., Results: Four family members, the mother and three siblings, were affected by myotonia. Moreover, EEG recordings revealed interictal generalized sharp-wave discharges in all affected individuals, and two siblings were affected by JME. All four affected members share the same identified variant, c.644 T > C, p.Ile215Thr, in SCN4A gene. Variants that could account for the epileptic phenotype alone, separately from the myotonic one, were not identified., Significance: These results provide supporting evidence that both myotonic and epileptic phenotypes could share a common genetic background, due to variants in SCN4A gene. SCN4A pathogenic variants, already known to be causative of myotonia, likely increase the susceptibility to epilepsy in our family., Plain Language Summary: This study analyzed all members of an Italian family, in which the mother and three siblings had myotonia and epilepsy. Genetic analysis allowed to identify a variant in the SCN4A gene, which appears to be the cause of both clinical signs in this family., (© 2024 The Authors. Epilepsia Open published by Wiley Periodicals LLC on behalf of International League Against Epilepsy.)
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- 2024
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45. Developmental epileptic encephalopathy in DLG4-related synaptopathy.
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Kassabian B, Levy AM, Gardella E, Aledo-Serrano A, Ananth AL, Brea-Fernández AJ, Caumes R, Chatron N, Dainelli A, De Wachter M, Denommé-Pichon AS, Dye TJ, Fazzi E, Felt R, Fernández-Jaén A, Fernández-Prieto M, Gantz E, Gasperowicz P, Gil-Nagel A, Gómez-Andrés D, Greiner HM, Guerrini R, Haanpää MK, Helin M, Hoyer J, Hurst ACE, Kallish S, Karkare SN, Khan A, Kleinendorst L, Koch J, Kothare SV, Koudijs SM, Lagae L, Lakeman P, Leppig KA, Lesca G, Lopergolo D, Lusk L, Mackenzie A, Mei D, Møller RS, Pereira EM, Platzer K, Quelin C, Revah-Politi A, Rheims S, Rodríguez-Palmero A, Rossi A, Santorelli F, Seinfeld S, Sell E, Stephenson D, Szczaluba K, Trinka E, Umair M, Van Esch H, van Haelst MM, Veenma DCM, Weber S, Weckhuysen S, Zacher P, Tümer Z, and Rubboli G
- Subjects
- Humans, Retrospective Studies, Muscle Hypotonia, Seizures complications, Electroencephalography methods, Disks Large Homolog 4 Protein genetics, Epilepsy diagnostic imaging, Epilepsy genetics, Epilepsy complications, Brain Diseases genetics, Epilepsy, Generalized complications, Intellectual Disability genetics, Intellectual Disability complications
- Abstract
Objective: The postsynaptic density protein of excitatory neurons PSD-95 is encoded by discs large MAGUK scaffold protein 4 (DLG4), de novo pathogenic variants of which lead to DLG4-related synaptopathy. The major clinical features are developmental delay, intellectual disability (ID), hypotonia, sleep disturbances, movement disorders, and epilepsy. Even though epilepsy is present in 50% of the individuals, it has not been investigated in detail. We describe here the phenotypic spectrum of epilepsy and associated comorbidities in patients with DLG4-related synaptopathy., Methods: We included 35 individuals with a DLG4 variant and epilepsy as part of a multicenter study. The DLG4 variants were detected by the referring laboratories. The degree of ID, hypotonia, developmental delay, and motor disturbances were evaluated by the referring clinician. Data on awake and sleep electroencephalography (EEG) and/or video-polygraphy and brain magnetic resonance imaging were collected. Antiseizure medication response was retrospectively assessed by the referring clinician., Results: A large variety of seizure types was reported, although focal seizures were the most common. Encephalopathy related to status epilepticus during slow-wave sleep (ESES)/developmental epileptic encephalopathy with spike-wave activation during sleep (DEE-SWAS) was diagnosed in >25% of the individuals. All but one individual presented with neurodevelopmental delay. Regression in verbal and/or motor domains was observed in all individuals who suffered from ESES/DEE-SWAS, as well as some who did not. We could not identify a clear genotype-phenotype relationship even between individuals with the same DLG4 variants., Significance: Our study shows that a subgroup of individuals with DLG4-related synaptopathy have DEE, and approximately one fourth of them have ESES/DEE-SWAS. Our study confirms DEE as part of the DLG4-related phenotypic spectrum. Occurrence of ESES/DEE-SWAS in DLG4-related synaptopathy requires proper investigation with sleep EEG., (© 2023 International League Against Epilepsy.)
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- 2024
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46. Novel syndromic neurodevelopmental disorder caused by de novo deletion of CHASERR , a long noncoding RNA.
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Ganesh VS, Riquin K, Chatron N, Lamar KM, Aziz MC, Monin P, O'Leary M, Goodrich JK, Garimella KV, England E, Yoon E, Weisburd B, Aguet F, Bacino CA, Murdock DR, Dai H, Rosenfeld JA, Emrick LT, Ketkar S, Sarusi Y, Sanlaville D, Kayani S, Broadbent B, Isidor B, Pengam A, Cogné B, MacArthur DG, Ulitsky I, Carvill GL, and O'Donnell-Luria A
- Abstract
Genes encoding long non-coding RNAs (lncRNAs) comprise a large fraction of the human genome, yet haploinsufficiency of a lncRNA has not been shown to cause a Mendelian disease. CHASERR is a highly conserved human lncRNA adjacent to CHD2- a coding gene in which de novo loss-of-function variants cause developmental and epileptic encephalopathy. Here we report three unrelated individuals each harboring an ultra-rare heterozygous de novo deletion in the CHASERR locus. We report similarities in severe developmental delay, facial dysmorphisms, and cerebral dysmyelination in these individuals, distinguishing them from the phenotypic spectrum of CHD2 haploinsufficiency. We demonstrate reduced CHASERR mRNA expression and corresponding increased CHD2 mRNA and protein in whole blood and patient-derived cell lines-specifically increased expression of the CHD2 allele in cis with the CHASERR deletion, as predicted from a prior mouse model of Chaserr haploinsufficiency. We show for the first time that de novo structural variants facilitated by Alu-mediated non-allelic homologous recombination led to deletion of a non-coding element (the lncRNA CHASERR ) to cause a rare syndromic neurodevelopmental disorder. We also demonstrate that CHD2 has bidirectional dosage sensitivity in human disease. This work highlights the need to carefully evaluate other lncRNAs, particularly those upstream of genes associated with Mendelian disorders.
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- 2024
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47. Episignatures in practice: independent evaluation of published episignatures for the molecular diagnostics of ten neurodevelopmental disorders.
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Husson T, Lecoquierre F, Nicolas G, Richard AC, Afenjar A, Audebert-Bellanger S, Badens C, Bilan F, Bizaoui V, Boland A, Bonnet-Dupeyron MN, Brischoux-Boucher E, Bonnet C, Bournez M, Boute O, Brunelle P, Caumes R, Charles P, Chassaing N, Chatron N, Cogné B, Colin E, Cormier-Daire V, Dard R, Dauriat B, Delanne J, Deleuze JF, Demurger F, Denommé-Pichon AS, Depienne C, Dieux A, Dubourg C, Edery P, El Chehadeh S, Faivre L, Fergelot P, Fradin M, Garde A, Geneviève D, Gilbert-Dussardier B, Goizet C, Goldenberg A, Gouy E, Guerrot AM, Guimier A, Harzalla I, Héron D, Isidor B, Lacombe D, Le Guillou Horn X, Keren B, Kuechler A, Lacaze E, Lavillaureix A, Lehalle D, Lesca G, Lespinasse J, Levy J, Lyonnet S, Morel G, Jean-Marçais N, Marlin S, Marsili L, Mignot C, Nambot S, Nizon M, Olaso R, Pasquier L, Perrin L, Petit F, Pingault V, Piton A, Prieur F, Putoux A, Planes M, Odent S, Quélin C, Quemener-Redon S, Rama M, Rio M, Rossi M, Schaefer E, Rondeau S, Saugier-Veber P, Smol T, Sigaudy S, Touraine R, Mau-Them FT, Trimouille A, Van Gils J, Vanlerberghe C, Vantalon V, Vera G, Vincent M, Ziegler A, Guillin O, Campion D, and Charbonnier C
- Subjects
- Humans, DNA Methylation, Biomarkers, Pathology, Molecular, Neurodevelopmental Disorders diagnosis, Neurodevelopmental Disorders genetics
- Abstract
Variants of uncertain significance (VUS) are a significant issue for the molecular diagnosis of rare diseases. The publication of episignatures as effective biomarkers of certain Mendelian neurodevelopmental disorders has raised hopes to help classify VUS. However, prediction abilities of most published episignatures have not been independently investigated yet, which is a prerequisite for an informed and rigorous use in a diagnostic setting. We generated DNA methylation data from 101 carriers of (likely) pathogenic variants in ten different genes, 57 VUS carriers, and 25 healthy controls. Combining published episignature information and new validation data with a k-nearest-neighbour classifier within a leave-one-out scheme, we provide unbiased specificity and sensitivity estimates for each of the signatures. Our procedure reached 100% specificity, but the sensitivities unexpectedly spanned a very large spectrum. While ATRX, DNMT3A, KMT2D, and NSD1 signatures displayed a 100% sensitivity, CREBBP-RSTS and one of the CHD8 signatures reached <40% sensitivity on our dataset. Remaining Cornelia de Lange syndrome, KMT2A, KDM5C and CHD7 signatures reached 70-100% sensitivity at best with unstable performances, suffering from heterogeneous methylation profiles among cases and rare discordant samples. Our results call for cautiousness and demonstrate that episignatures do not perform equally well. Some signatures are ready for confident use in a diagnostic setting. Yet, it is imperative to characterise the actual validity perimeter and interpretation of each episignature with the help of larger validation sample sizes and in a broader set of episignatures., (© 2023. The Author(s).)
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- 2024
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48. GRM7-related disorder: five additional patients from three independent families and review of the literature.
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Januel L, Chatron N, Rivier-Ringenbach C, Cabet S, Labalme A, Sahin Y, Darvish H, Kruer M, Bakhtiari S, Sanlaville D, de Sainte Agathe JM, and Lesca G
- Subjects
- Humans, Seizures, Phenotype, Epilepsy genetics, Brain Diseases genetics, Neurodevelopmental Disorders genetics, Receptors, Metabotropic Glutamate
- Abstract
Developmental and epileptic encephalopathies (DEEs) refer to a group of severe epileptic syndromes characterized by seizures as well as a developmental delay which can be a consequence of the underlying etiology and/or the epileptic encephalopathy. The genes responsible for DEEs are numerous and their number is increasing since the availability of Next-Generation Sequencing. Pathogenic variants in GRM7, encoding the metabotropic glutamate receptor 7, were recently shown as a cause of a severe DEE with autosomal recessive inheritance. To date, only ten patients have been reported in the literature, generally with severe phenotypes including early-onset epilepsy, microcephaly, brain anomalies, and spasticity. We report here 5 patients from 3 independent families with biallelic variants in the GRM7 gene. We review the literature and provide further elements for the understanding of the genotype-phenotype correlation of this rare syndrome., (Copyright © 2024 The Authors. Published by Elsevier Masson SAS.. All rights reserved.)
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- 2024
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49. Molecular and Phenotypic Characterization of the RORB -Related Disorder.
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Gokce-Samar Z, Vetro A, De Bellescize J, Pisano T, Monteiro L, Penaud N, Korff CM, Fluss J, Marini C, Cesaroni E, Alvarez BM, Sanlaville D, Chatron N, Arzimanoglou AA, Labalme A, Cuddapah VA, Ruggiero SM, Lecoquierre F, Nicolas G, Marie GA, Lebas A, Testard HO, Helbig KL, Ruiz A, Ngoh A, Kurian MA, Reid K, Spaull R, Joset P, Ramantani G, Steindl K, Krenn M, Gerstl L, Vieker S, Craiu D, Pendziwiat M, Haldeman-Englert C, Kanivets I, Romanova I, Rajan DS, Rosenfeld JA, Au M, Grand K, Graham M Jr, Isapof A, Villeneuve N, Smol T, Caumes R, Zacher P, Neuser S, Tinschert S, Platzer K, Bartolomaeus T, Mohnke I, Radtke M, Jamra RA, Helbig I, Jansen FE, Koop K, Rudolf G, Küry S, Courchet J, Guerrini R, and Lesca G
- Subjects
- Humans, Male, Animals, Mice, Child, Preschool, Child, Adolescent, Young Adult, Adult, Infant, Seizures, Phenotype, Genotype, Nuclear Receptor Subfamily 1, Group F, Member 2, Epilepsy, Absence genetics, Epilepsy, Generalized genetics, Intellectual Disability
- Abstract
Background and Objectives: Heterozygous variants in RAR-related orphan receptor B ( RORB ) have recently been associated with susceptibility to idiopathic generalized epilepsy. However, few reports have been published so far describing pathogenic variants of this gene in patients with epilepsy and intellectual disability (ID). In this study, we aimed to delineate the epilepsy phenotype associated with RORB pathogenic variants and to provide arguments in favor of the pathogenicity of variants., Methods: Through an international collaboration, we analyzed seizure characteristics, EEG data, and genotypes of a cohort of patients with heterozygous variants in RORB . To gain insight into disease mechanisms, we performed ex vivo cortical electroporation in mouse embryos of 5 selected variants, 2 truncating and 3 missense, and evaluated on expression and quantified changes in axonal morphology., Results: We identified 35 patients (17 male, median age 10 years, range 2.5-23 years) carrying 32 different heterozygous variants in RORB , including 28 single-nucleotide variants or small insertions/deletions (12 missense, 12 frameshift or nonsense, 2 splice-site variants, and 2 in-frame deletions), and 4 microdeletions; de novo in 18 patients and inherited in 10. Seizures were reported in 31/35 (89%) patients, with a median age at onset of 3 years (range 4 months-12 years). Absence seizures occurred in 25 patients with epilepsy (81%). Nineteen patients experienced a single seizure type: absences, myoclonic absences, or absences with eyelid myoclonia and focal seizures. Nine patients had absence seizures combined with other generalized seizure types. One patient had presented with absences associated with photosensitive occipital seizures. Three other patients had generalized tonic-clonic seizures without absences. ID of variable degree was observed in 85% of the patients. Expression studies in cultured neurons showed shorter axons for the 5 tested variants, both truncating and missense variants, supporting an impaired protein function., Discussion: In most patients, the phenotype of the RORB -related disorder associates absence seizures with mild-to-moderate ID. In silico and in vitro evaluation of the variants in our cohort, including axonal morphogenetic experiments in cultured neurons, supports their pathogenicity, showing a hypomorphic effect.
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- 2024
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50. Structural investigation of vitamin K epoxide reductase domain-containing protein in Leptospira species: a potential target for the development of new leptospirosis treatments as an alternative to antibiotics.
- Author
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Soro SD, Lattard V, Kodjo A, Benoît E, and Chatron N
- Abstract
Leptospirosis is a worldwide zoonosis caused by the motile bacterium Leptospira . This disease can cause hemorrhagic symptoms, multi-visceral and renal failures, resulting in one million cases and approximately 60,000 deaths each year. The motility of Leptospira is highly involved in its virulence and is ensured by the presence of two flagella in the periplasm. Several proteins that require the formation of disulfide bridges are essential for flagellar function. In Leptospira , these redox reactions are catalysed by the vitamin K epoxide reductase domain-containing protein (VKORdcp). The aim of the present work was to study the conservation of VKORdcp among Leptospira species and its interactions with putative substrates and inhibitor. Our results evidenced the presence of ten amino acids specific to either pathogenic or saprophytic species. Furthermore, structural studies revealed a higher affinity of the enzyme for vitamin K1 quinone, compared to ubiquinone. Finally, characterisation of the binding of a potential inhibitor revealed the involvement of some VKORdcp amino acids that have not been present in the human enzyme, in particular the polar residue D114. Our study thus paves the way for the future development of Leptospira VKORdcp inhibitors, capable of blocking bacterial motility. Such molecules could therefore offer a promising therapeutic alternative to antibiotics, especially in the event of the emergence of antibiotic-resistant strains.Communicated by Ramaswamy H. Sarma.
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- 2024
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