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1. The majority of autosomal recessive nanophthalmos and posterior microphthalmia can be attributed to biallelic sequence and structural variants in MFRP and PRSS56.

Author

Almoallem, Basamat, Arno, Gavin, De Zaeytijd, Julie, Verdin, Hannah, Balikova, Irina, Casteels, Ingele, de Ravel, Thomy, Hull, Sarah, Suzani, Martina, Destrée, Anne, Peng, Michelle, Williams, Denise, Ainsworth, John R, Webster, Andrew R, Leroy, Bart P, Moore, Anthony T, and De Baere, Elfride

Subjects
Humans, Microphthalmos, Membrane Proteins, Cohort Studies, Family, Heterozygote, Mutation, Alleles, Adolescent, Adult, Aged, Middle Aged, Child, Child, Preschool, Female, Male, DNA Copy Number Variations, Serine Proteases, Whole Genome Sequencing
Abstract

This study aimed to genetically and clinically characterize a unique cohort of 25 individuals from 21 unrelated families with autosomal recessive nanophthalmos (NNO) and posterior microphthalmia (MCOP) from different ethnicities. An ophthalmological assessment in all families was followed by targeted MFRP and PRSS56 testing in 20 families and whole-genome sequencing in one family. Three families underwent homozygosity mapping using SNP arrays. Eight distinct MFRP mutations were found in 10/21 families (47.6%), five of which are novel including a deletion spanning the 5' untranslated region and the first coding part of exon 1. Most cases harbored homozygous mutations (8/10), while a compound heterozygous and a monoallelic genotype were identified in the remaining ones (2/10). Six distinct PRSS56 mutations were found in 9/21 (42.9%) families, three of which are novel. Similarly, homozygous mutations were found in all but one, leaving 2/21 families (9.5%) without a molecular diagnosis. Clinically, all patients had reduced visual acuity, hyperopia, short axial length and crowded optic discs. Retinitis pigmentosa was observed in 5/10 (50%) of the MFRP group, papillomacular folds in 12/19 (63.2%) of MCOP and in 3/6 (50%) of NNO cases. A considerable phenotypic variability was observed, with no clear genotype-phenotype correlations. Overall, our study represents the largest NNO and MCOP cohort reported to date and provides a genetic diagnosis in 19/21 families (90.5%), including the first MFRP genomic rearrangement, offering opportunities for gene-based therapies in MFRP-associated disease. Finally, our study underscores the importance of sequence and copy number analysis of the MFRP and PRSS56 genes in MCOP and NNO.

Published
2020

4. A clinical scoring system for congenital contractural arachnodactyly

Author

Meerschaut, Ilse, De Coninck, Shana, Steyaert, Wouter, Barnicoat, Angela, Bayat, Allan, Benedicenti, Francesco, Berland, Siren, Blair, Edward M., Breckpot, Jeroen, de Burca, Anna, Destrée, Anne, García-Miñaúr, Sixto, Green, Andrew J., Hanna, Bernadette C., Keymolen, Kathelijn, Koopmans, Marije, Lederer, Damien, Lees, Melissa, Longman, Cheryl, Lynch, Sally Ann, Male, Alison M., McKenzie, Fiona, Migeotte, Isabelle, Mihci, Ercan, Nur, Banu, Petit, Florence, Piard, Juliette, Plasschaert, Frank S., Rauch, Anita, Ribaï, Pascale, Pacheco, Iratxe Salcedo, Stanzial, Franco, Stolte-Dijkstra, Irene, Valenzuela, Irene, Varghese, Vinod, Vasudevan, Pradeep C., Wakeling, Emma, Wallgren-Pettersson, Carina, Coucke, Paul, De Paepe, Anne, De Wolf, Daniël, Symoens, Sofie, and Callewaert, Bert

Published
2020
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5. The phenotype of Floating-Harbor syndrome: clinical characterization of 52 individuals with mutations in exon 34 of SRCAP

Author

Nikkel, Sarah M, Dauber, Andrew, de Munnik, Sonja, Connolly, Meghan, Hood, Rebecca L, Caluseriu, Oana, Hurst, Jane, Kini, Usha, Nowaczyk, Malgorzata J M, Afenjar, Alexandra, Albrecht, Beate, Allanson, Judith E, Balestri, Paolo, Ben-Omran, Tawfeg, Brancati, Francesco, Cordeiro, Isabel, da Cunha, Bruna Santos, Delaney, Louisa A, Destrée, Anne, Fitzpatrick, David, Forzano, Francesca, Ghali, Neeti, Gillies, Greta, Harwood, Katerina, Hendriks, Yvonne M C, Héron, Delphine, Hoischen, Alexander, Honey, Engela Magdalena, Hoefsloot, Lies H, Ibrahim, Jennifer, Jacob, Claire M, Kant, Sarina G, Kim, Chong Ae, Kirk, Edwin P, Knoers, Nine V A M, Lacombe, Didier, Lee, Chung, Lo, Ivan F M, Lucas, Luiza S, Mari, Francesca, Mericq, Veronica, Moilanen, Jukka S, Møller, Sanne Traasdahl, Moortgat, Stephanie, Pilz, Daniela T, Pope, Kate, Price, Susan, Renieri, Alessandra, Sá, Joaquim, Schoots, Jeroen, Silveira, Elizabeth L, Simon, Marleen E H, Slavotinek, Anne, Temple, I Karen, van der Burgt, Ineke, de Vries, Bert B A, Weisfeld-Adams, James D, Whiteford, Margo L, Wierczorek, Dagmar, Wit, Jan M, Yee, Connie Fung On, Beaulieu, Chandree L, cpgdsconsortium@cheo.on.ca, White, Sue M, Bulman, Dennis E, Bongers, Ernie, Brunner, Han, Feingold, Murray, and Boycott, Kym M

Abstract

Abstract Background Floating-Harbor syndrome (FHS) is a rare condition characterized by short stature, delays in expressive language, and a distinctive facial appearance. Recently, heterozygous truncating mutations in SRCAP were determined to be disease-causing. With the availability of a DNA based confirmatory test, we set forth to define the clinical features of this syndrome. Methods and results Clinical information on fifty-two individuals with SRCAP mutations was collected using standardized questionnaires. Twenty-four males and twenty-eight females were studied with ages ranging from 2 to 52 years. The facial phenotype and expressive language impairments were defining features within the group. Height measurements were typically between minus two and minus four standard deviations, with occipitofrontal circumferences usually within the average range. Thirty-three of the subjects (63%) had at least one major anomaly requiring medical intervention. We did not observe any specific phenotype-genotype correlations. Conclusions This large cohort of individuals with molecularly confirmed FHS has allowed us to better delineate the clinical features of this rare but classic genetic syndrome, thereby facilitating the development of management protocols.

Published
2013

7. Episignature analysis of moderate effects and mosaics

Author

Oexle, Konrad, primary, Zech, Michael, additional, Stühn, Lara, additional, Siegert, Sandy, additional, Brunet, Theresa, additional, Schmidt, Wolfgang, additional, Wagner, Matias, additional, Schmidt, Axel, additional, Tilch, Erik, additional, Monestier, Olivier, additional, Destrée, Anne, additional, Hanker, Britta, additional, Boesch, Sylvia, additional, Jech, Robert, additional, Berutti, Riccardo, additional, Kaiser, Frank, additional, Haslinger, Bernhard, additional, Haack, Tobias, additional, Garavaglia, Barbara, additional, Krawitz, Peter, additional, Winkelmann, Juliane, additional, and Mirza-Schreiber, Nazanin, additional

Published
2023
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8. Implementation of genomic arrays in prenatal diagnosis: The Belgian approach to meet the challenges

Author

Vanakker, Olivier, Vilain, Catheline, Janssens, Katrien, Van der Aa, Nathalie, Smits, Guillaume, Bandelier, Claude, Blaumeiser, Bettina, Bulk, Saskia, Caberg, Jean-Hubert, De Leener, Anne, De Rademaeker, Marjan, de Ravel, Thomy, Desir, Julie, Destree, Anne, Dheedene, Annelies, Gaillez, Stéphane, Grisart, Bernard, Hellin, Ann-Cécile, Janssens, Sandra, Keymolen, Kathelijn, Menten, Björn, Pichon, Bruno, Ravoet, Marie, Revencu, Nicole, Rombout, Sonia, Staessens, Catherine, Van Den Bogaert, Ann, Van Den Bogaert, Kris, Vermeesch, Joris R., Kooy, Frank, Sznajer, Yves, and Devriendt, Koen

Published
2014
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9. ASC1 complex related conditions: Two novel paediatric patients with TRIP4 pathogenic variants and review of literature

Author

UCL - (SLuc) Département de pédiatrie, Dembour, Alexis, Destrée, Anne, Deprez, Marie, Kadhim, Hazim, Karadurmus, Deniz, Froment, Olivier, Deconinck, Nicolas, Lederer, Damien, UCL - (SLuc) Département de pédiatrie, Dembour, Alexis, Destrée, Anne, Deprez, Marie, Kadhim, Hazim, Karadurmus, Deniz, Froment, Olivier, Deconinck, Nicolas, and Lederer, Damien

Abstract

Pathogenic variants in the genes encoding for the ASC1 complex were recently reported in patients with congenital fractures, joint contractures, neonatal hypotonia and respiratory distress. Here we report two male children with biallelic TRIP4 pathogenic loss of function variants. The first child presented with foetal bradykinesia, neonatal respiratory distress, central and peripheral hypotonia, constipation, hyperlaxity, left uretero-hydronephrosis and post-obstructive kidney dysplasia. The second had severe central and peripheral neonatal hypotonia, feeding difficulties, kyphosis, developmental delay and hyperlaxity. Detailed review of all reported cases with ASCC1 (12 patients) and TRIP4 (18 patients) variants highlights striking genotype-phenotype correlations. This is the fourth report of patients with TRIP4 variants and the first description of post-obstructive kidney dysplasia in this condition.

Published
2022

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

Author

Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], BMBF, Treat-ION, 01GM1907 [sponsor], Johannesen, Katrine M., Liu, Yuanyuan, Koko, Mahmoud, Gjerulfsen, Cathrine E., Sonnenberg, Lukas, Schubert, Julian, Fenger, Christina D., Eltokhi, Ahmed, Rannap, Maert, Koch, Nils A., Lauxmann, Stephan, Krüger, Johanna, Kegele, Josua, Canafoglia, Laura, Franceschetti, Silvana, Mayer, Thomas, Rebstock, Johannes, Zacher, Pia, Ruf, Susanne, Alber, Michael, Sterbova, Katalin, Lassuthová, Petra, Vlckova, Marketa, Lemke, Johannes R., Platzer, Konrad, Krey, Ilona, Heine, Constanze, Wieczorek, Dagmar, Kroell-Seger, Judith, Lund, Caroline, Klein, Karl Martin, Billie Au, P. Y., Rho, Jong M., Ho, Alice W., Masnada, Silvia, Veggiotti, Pierangelo, Giordano, Lucio, Accorsi, Patrizia, Hoei-Hansen, Christina E., Striano, Pasquale, Zara, Federico, Verhelst, Helene, Verhoeven, Judith S., van der Zwaag, Bert, Harder, Aster V. E., Brilstra, Eva, Pendziwiat, Manuela, Lebon, Sebastian, Vaccarezza, Maria, Minh Le, Ngoc, Christensen, Jakob, Grønborg, Sabine, Scherer, Stephen W., Howe, Jennifer, Fazeli, Walid, Howell, Katherine B., Leventer, Richard, Stutterd, Chloe, Walsh, Sonja, Gerard, Marion, Gerard, Bénédicte, Matricardi, Sara, Bonardi, Claudia M., Sartori, Stefano, Berger, Andrea, Hoffman-Zacharska, Dorota, Mastrangelo, Massimo, Darra, Francesca, Vøllo, Arve, Motazacker, M. Mahdi, Lakeman, Phillis, Nizon, Mathilde, Betzler, Cornelia, Altuzarra, Cecilia, Caume, Roseline, Roubertie, Agathe, Gélisse, Philippe, Marini, Carla, Guerrini, Renzo, Bilan, Frederic, Tibussek, Daniel, Koch-Hogrebe, Margarete, Perry, M. Scott, Ichikawa, Shoji, Dadali, Elena, Sharkov, Artem, Mishina, Irina, Abramov, Mikhail, Kanivets, Ilya, Korostelev, Sergey, Kutsev, Sergey, Wain, Karen E., Eisenhauer, Nancy, Wagner, Monisa, Savatt, Juliann M., Müller-Schlüter, Karen, Bassan, Haim, Borovikov, Artem, Nassogne, Marie-Cecile, Destrée, Anne, Schoonjans, An-Sofie, Meuwissen, Marije, Buzatu, Marga, Jansen, Anna, Scalais, Emmanuel, Srivastava, Siddharth, Tan, Wen-Hann, Olson, Heather E., Loddenkemper, Tobias, Poduri, Annapurna, Helbig, Katherine L., Helbig, Ingo, Fitzgerald, Mark P., Goldberg, Ethan M., Roser, Timo, Borggraefe, Ingo, Brünger, Tobias, May, Patrick, Lal, Dennis, Lederer, Damien, Rubboli, Guido, Heyne, Henrike O., Lesca, Gaetan, Hedrich, Ulrike B. S., Benda, Jan, Gardella, Elena, Lerche, Holger, Møller, Rikke S., Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], BMBF, Treat-ION, 01GM1907 [sponsor], Johannesen, Katrine M., Liu, Yuanyuan, Koko, Mahmoud, Gjerulfsen, Cathrine E., Sonnenberg, Lukas, Schubert, Julian, Fenger, Christina D., Eltokhi, Ahmed, Rannap, Maert, Koch, Nils A., Lauxmann, Stephan, Krüger, Johanna, Kegele, Josua, Canafoglia, Laura, Franceschetti, Silvana, Mayer, Thomas, Rebstock, Johannes, Zacher, Pia, Ruf, Susanne, Alber, Michael, Sterbova, Katalin, Lassuthová, Petra, Vlckova, Marketa, Lemke, Johannes R., Platzer, Konrad, Krey, Ilona, Heine, Constanze, Wieczorek, Dagmar, Kroell-Seger, Judith, Lund, Caroline, Klein, Karl Martin, Billie Au, P. Y., Rho, Jong M., Ho, Alice W., Masnada, Silvia, Veggiotti, Pierangelo, Giordano, Lucio, Accorsi, Patrizia, Hoei-Hansen, Christina E., Striano, Pasquale, Zara, Federico, Verhelst, Helene, Verhoeven, Judith S., van der Zwaag, Bert, Harder, Aster V. E., Brilstra, Eva, Pendziwiat, Manuela, Lebon, Sebastian, Vaccarezza, Maria, Minh Le, Ngoc, Christensen, Jakob, Grønborg, Sabine, Scherer, Stephen W., Howe, Jennifer, Fazeli, Walid, Howell, Katherine B., Leventer, Richard, Stutterd, Chloe, Walsh, Sonja, Gerard, Marion, Gerard, Bénédicte, Matricardi, Sara, Bonardi, Claudia M., Sartori, Stefano, Berger, Andrea, Hoffman-Zacharska, Dorota, Mastrangelo, Massimo, Darra, Francesca, Vøllo, Arve, Motazacker, M. Mahdi, Lakeman, Phillis, Nizon, Mathilde, Betzler, Cornelia, Altuzarra, Cecilia, Caume, Roseline, Roubertie, Agathe, Gélisse, Philippe, Marini, Carla, Guerrini, Renzo, Bilan, Frederic, Tibussek, Daniel, Koch-Hogrebe, Margarete, Perry, M. Scott, Ichikawa, Shoji, Dadali, Elena, Sharkov, Artem, Mishina, Irina, Abramov, Mikhail, Kanivets, Ilya, Korostelev, Sergey, Kutsev, Sergey, Wain, Karen E., Eisenhauer, Nancy, Wagner, Monisa, Savatt, Juliann M., Müller-Schlüter, Karen, Bassan, Haim, Borovikov, Artem, Nassogne, Marie-Cecile, Destrée, Anne, Schoonjans, An-Sofie, Meuwissen, Marije, Buzatu, Marga, Jansen, Anna, Scalais, Emmanuel, Srivastava, Siddharth, Tan, Wen-Hann, Olson, Heather E., Loddenkemper, Tobias, Poduri, Annapurna, Helbig, Katherine L., Helbig, Ingo, Fitzgerald, Mark P., Goldberg, Ethan M., Roser, Timo, Borggraefe, Ingo, Brünger, Tobias, May, Patrick, Lal, Dennis, Lederer, Damien, Rubboli, Guido, Heyne, Henrike O., Lesca, Gaetan, Hedrich, Ulrike B. S., Benda, Jan, Gardella, Elena, Lerche, Holger, and Møller, Rikke S.

Abstract

We report detailed functional analyses and genotype-phenotype correlations in 392 individuals carrying disease-causing variants in SCN8A, encoding the voltage-gated Na+ channel NaV1.6, with the aim of describing clinical phenotypes related to functional effects. Six different clinical subgroups could be identified: 1) Benign familial infantile epilepsy (BFIE) (n = 15, normal cognition, treatable seizures), 2) intermediate epilepsy (n = 33, mild ID, partially pharmaco-responsive), 3) developmental and epileptic encephalopathy (DEE, n = 177, severe ID, majority pharmaco-resistant), 4) generalized epilepsy (n = 20, mild to moderate ID, frequently with absence seizures), 5) unclassifiable epilepsy (n = 127), and 6) neurodevelopmental disorder without epilepsy (n = 20, mild to moderate ID). Groups 1–3 presented with focal or multifocal seizures (median age of onset: four months) and focal epileptiform discharges, whereas the onset of seizures in group 4 was later (median: 42 months) with generalized epileptiform discharges. We performed functional studies expressing missense variants in ND7/23 neuroblastoma cells and primary neuronal cultures using recombinant tetrodotoxin-insensitive human NaV1.6 channels and whole-cell patch-clamping. Two variants causing DEE showed a strong gain-of-function (GOF, hyperpolarising shift of steady-state activation, strongly increased neuronal firing rate), and one variant causing BFIE or intermediate epilepsy showed a mild GOF (defective fast inactivation, less increased firing). In contrast, all three variants causing generalized epilepsy induced a loss-of-function (LOF, reduced current amplitudes, depolarising shift of steady-state activation, reduced neuronal firing). Including previous studies, functional effects were known for 170 individuals. All 136 individuals carrying a functionally tested GOF variant had either focal (97, groups 1–3), or unclassifiable epilepsy (39), whereas 34 with a LOF variant had either generalized (14), no

Published
2022

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

Author

Johannesen, Katrine M., Liu, Yuanyuan, Koko, Mahmoud, Gjerulfsen, Cathrine E., Sonnenberg, Lukas, Schubert, Julian, Fenger, Christina D., Eltokhi, Ahmed, Rannap, Maert, Koch, Nils A., Lauxmann, Stephan, Krüger, Johanna, Kegele, Josua, Canafoglia, Laura, Franceschetti, Silvana, Mayer, Thomas, Rebstock, Johannes, Zacher, Pia, Ruf, Susanne, Alber, Michael, Sterbova, Katalin, Lassuthová, Petra, Vlckova, Marketa, Lemke, Johannes R., Platzer, Konrad, Krey, Ilona, Heine, Constanze, Wieczorek, Dagmar, Kroell-Seger, Judith, Lund, Caroline, Klein, Karl Martin, Au, P. Y.Billie, Rho, Jong M., Ho, Alice W., Masnada, Silvia, Veggiotti, Pierangelo, Giordano, Lucio, Accorsi, Patrizia, Hoei-Hansen, Christina E., Striano, Pasquale, Zara, Federico, Verhelst, Helene, Verhoeven, Judith S., Braakman, Hilde M.H., van der Zwaag, Bert, Harder, Aster V.E., Brilstra, Eva, Pendziwiat, Manuela, Lebon, Sebastian, Vaccarezza, Maria, Le, Ngoc Minh, Christensen, Jakob, Grønborg, Sabine, Scherer, Stephen W., Howe, Jennifer, Fazeli, Walid, Howell, Katherine B., Leventer, Richard, Stutterd, Chloe, Walsh, Sonja, Gerard, Marion, Gerard, Bénédicte, Matricardi, Sara, Bonardi, Claudia M., Sartori, Stefano, Berger, Andrea, Hoffman-Zacharska, Dorota, Mastrangelo, Massimo, Darra, Francesca, Vøllo, Arve, Motazacker, M. Mahdi, Lakeman, Phillis, Nizon, Mathilde, Betzler, Cornelia, Altuzarra, Cecilia, Caume, Roseline, Roubertie, Agathe, Gélisse, Philippe, Marini, Carla, Guerrini, Renzo, Bilan, Frederic, Tibussek, Daniel, Koch-Hogrebe, Margarete, Perry, M. Scott, Ichikawa, Shoji, Dadali, Elena, Sharkov, Artem, Mishina, Irina, Abramov, Mikhail, Kanivets, Ilya, Korostelev, Sergey, Kutsev, Sergey, Wain, Karen E., Eisenhauer, Nancy, Wagner, Monisa, Savatt, Juliann M., Müller-Schlüter, Karen, Bassan, Haim, Borovikov, Artem, Nassogne, Marie Cecile, Destrée, Anne, Schoonjans, An Sofie, Meuwissen, Marije, Buzatu, Marga, Jansen, Anna, Scalais, Emmanuel, Srivastava, Siddharth, Tan, Wen Hann, Olson, Heather E., Loddenkemper, Tobias, Poduri, Annapurna, Helbig, Katherine L., Helbig, Ingo, Fitzgerald, Mark P., Goldberg, Ethan M., Roser, Timo, Borggraefe, Ingo, Brünger, Tobias, May, Patrick, Lal, Dennis, Lederer, Damien, Rubboli, Guido, Heyne, Henrike O., Lesca, Gaetan, Hedrich, Ulrike B.S., Benda, Jan, Gardella, Elena, Lerche, Holger, Møller, Rikke S., Johannesen, Katrine M., Liu, Yuanyuan, Koko, Mahmoud, Gjerulfsen, Cathrine E., Sonnenberg, Lukas, Schubert, Julian, Fenger, Christina D., Eltokhi, Ahmed, Rannap, Maert, Koch, Nils A., Lauxmann, Stephan, Krüger, Johanna, Kegele, Josua, Canafoglia, Laura, Franceschetti, Silvana, Mayer, Thomas, Rebstock, Johannes, Zacher, Pia, Ruf, Susanne, Alber, Michael, Sterbova, Katalin, Lassuthová, Petra, Vlckova, Marketa, Lemke, Johannes R., Platzer, Konrad, Krey, Ilona, Heine, Constanze, Wieczorek, Dagmar, Kroell-Seger, Judith, Lund, Caroline, Klein, Karl Martin, Au, P. Y.Billie, Rho, Jong M., Ho, Alice W., Masnada, Silvia, Veggiotti, Pierangelo, Giordano, Lucio, Accorsi, Patrizia, Hoei-Hansen, Christina E., Striano, Pasquale, Zara, Federico, Verhelst, Helene, Verhoeven, Judith S., Braakman, Hilde M.H., van der Zwaag, Bert, Harder, Aster V.E., Brilstra, Eva, Pendziwiat, Manuela, Lebon, Sebastian, Vaccarezza, Maria, Le, Ngoc Minh, Christensen, Jakob, Grønborg, Sabine, Scherer, Stephen W., Howe, Jennifer, Fazeli, Walid, Howell, Katherine B., Leventer, Richard, Stutterd, Chloe, Walsh, Sonja, Gerard, Marion, Gerard, Bénédicte, Matricardi, Sara, Bonardi, Claudia M., Sartori, Stefano, Berger, Andrea, Hoffman-Zacharska, Dorota, Mastrangelo, Massimo, Darra, Francesca, Vøllo, Arve, Motazacker, M. Mahdi, Lakeman, Phillis, Nizon, Mathilde, Betzler, Cornelia, Altuzarra, Cecilia, Caume, Roseline, Roubertie, Agathe, Gélisse, Philippe, Marini, Carla, Guerrini, Renzo, Bilan, Frederic, Tibussek, Daniel, Koch-Hogrebe, Margarete, Perry, M. Scott, Ichikawa, Shoji, Dadali, Elena, Sharkov, Artem, Mishina, Irina, Abramov, Mikhail, Kanivets, Ilya, Korostelev, Sergey, Kutsev, Sergey, Wain, Karen E., Eisenhauer, Nancy, Wagner, Monisa, Savatt, Juliann M., Müller-Schlüter, Karen, Bassan, Haim, Borovikov, Artem, Nassogne, Marie Cecile, Destrée, Anne, Schoonjans, An Sofie, Meuwissen, Marije, Buzatu, Marga, Jansen, Anna, Scalais, Emmanuel, Srivastava, Siddharth, Tan, Wen Hann, Olson, Heather E., Loddenkemper, Tobias, Poduri, Annapurna, Helbig, Katherine L., Helbig, Ingo, Fitzgerald, Mark P., Goldberg, Ethan M., Roser, Timo, Borggraefe, Ingo, Brünger, Tobias, May, Patrick, Lal, Dennis, Lederer, Damien, Rubboli, Guido, Heyne, Henrike O., Lesca, Gaetan, Hedrich, Ulrike B.S., Benda, Jan, Gardella, Elena, Lerche, Holger, and Møller, Rikke S.

Abstract

We report detailed functional analyses and genotype-phenotype correlations in 392 individuals carrying disease-causing variants in SCN8A, encoding the voltage-gated Na+ channel Nav1.6, with the aim of describing clinical phenotypes related to functional effects. Six different clinical subgroups were identified: Group 1, benign familial infantile epilepsy (n = 15, normal cognition, treatable seizures); Group 2, intermediate epilepsy (n = 33, mild intellectual disability, partially pharmaco-responsive); Group 3, developmental and epileptic encephalopathy (n = 177, severe intellectual disability, majority pharmaco-resistant); Group 4, generalized epilepsy (n = 20, mild to moderate intellectual disability, frequently with absence seizures); Group 5, unclassifiable epilepsy (n = 127); and Group 6, neurodevelopmental disorder without epilepsy (n = 20, mild to moderate intellectual disability). Those in Groups 1-3 presented with focal or multifocal seizures (median age of onset: 4 months) and focal epileptiform discharges, whereas the onset of seizures in patients with generalized epilepsy was later (median: 42 months) with generalized epileptiform discharges. We performed functional studies expressing missense variants in ND7/23 neuroblastoma cells and primary neuronal cultures using recombinant tetrodotoxin-insensitive human Nav1.6 channels and whole-cell patch-clamping. Two variants causing developmental and epileptic encephalopathy showed a strong gain-of-function (hyperpolarizing shift of steady-state activation, strongly increased neuronal firing rate) and one variant causing benign familial infantile epilepsy or intermediate epilepsy showed a mild gain-of-function (defective fast inactivation, less increased firing). In contrast, all three variants causing generalized epilepsy induced a loss-of-function (reduced current amplitudes, depolarizing shift of steady-state activation, reduced neuronal firing). Functional effects were known for 170 individuals. All 136 i

Published
2022

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

Author

Genetica Sectie Genoomdiagnostiek, Child Health, Genetica Klinische Genetica, Brain, Johannesen, Katrine M, Liu, Yuanyuan, Koko, Mahmoud, Gjerulfsen, Cathrine E, Sonnenberg, Lukas, Schubert, Julian, Fenger, Christina D, Eltokhi, Ahmed, Rannap, Maert, Koch, Nils A, Lauxmann, Stephan, Krüger, Johanna, Kegele, Josua, Canafoglia, Laura, Franceschetti, Silvana, Mayer, Thomas, Rebstock, Johannes, Zacher, Pia, Ruf, Susanne, Alber, Michael, Sterbova, Katalin, Lassuthová, Petra, Vlckova, Marketa, Lemke, Johannes R, Platzer, Konrad, Krey, Ilona, Heine, Constanze, Wieczorek, Dagmar, Kroell-Seger, Judith, Lund, Caroline, Klein, Karl Martin, Billie Au, P Y, Rho, Jong M, Ho, Alice W, Masnada, Silvia, Veggiotti, Pierangelo, Giordano, Lucio, Accorsi, Patrizia, Hoei-Hansen, Christina E, Striano, Pasquale, Zara, Federico, Verhelst, Helene, Verhoeven, Judith S, van der Zwaag, Bert, Harder, Aster V E, Brilstra, Eva, Pendziwiat, Manuela, Lebon, Sebastian, Vaccarezza, Maria, Minh Le, Ngoc, Christensen, Jakob, Grønborg, Sabine, Scherer, Stephen W, Howe, Jennifer, Fazeli, Walid, Howell, Katherine B, Leventer, Richard, Stutterd, Chloe, Walsh, Sonja, Gerard, Marion, Gerard, Bénédicte, Matricardi, Sara, Bonardi, Claudia M, Sartori, Stefano, Berger, Andrea, Hoffman-Zacharska, Dorota, Mastrangelo, Massimo, Darra, Francesca, Vøllo, Arve, Motazacker, M Mahdi, Lakeman, Phillis, Nizon, Mathilde, Betzler, Cornelia, Altuzarra, Cecilia, Caume, Roseline, Roubertie, Agathe, Gélisse, Philippe, Marini, Carla, Guerrini, Renzo, Bilan, Frederic, Tibussek, Daniel, Koch-Hogrebe, Margarete, Perry, M Scott, Ichikawa, Shoji, Dadali, Elena, Sharkov, Artem, Mishina, Irina, Abramov, Mikhail, Kanivets, Ilya, Korostelev, Sergey, Kutsev, Sergey, Wain, Karen E, Eisenhauer, Nancy, Wagner, Monisa, Savatt, Juliann M, Müller-Schlüter, Karen, Bassan, Haim, Borovikov, Artem, Nassogne, Marie-Cecile, Destrée, Anne, Schoonjans, An-Sofie, Meuwissen, Marije, Buzatu, Marga, Jansen, Anna, Scalais, Emmanuel, Srivastava, Siddharth, Tan, Wen-Hann, Olson, Heather E, Loddenkemper, Tobias, Poduri, Annapurna, Helbig, Katherine L, Helbig, Ingo, Fitzgerald, Mark P, Goldberg, Ethan M, Roser, Timo, Borggraefe, Ingo, Brünger, Tobias, May, Patrick, Lal, Dennis, Lederer, Damien, Rubboli, Guido, Heyne, Henrike O, Lesca, Gaetan, Hedrich, Ulrike B S, Benda, Jan, Gardella, Elena, Lerche, Holger, Møller, Rikke S, Genetica Sectie Genoomdiagnostiek, Child Health, Genetica Klinische Genetica, Brain, Johannesen, Katrine M, Liu, Yuanyuan, Koko, Mahmoud, Gjerulfsen, Cathrine E, Sonnenberg, Lukas, Schubert, Julian, Fenger, Christina D, Eltokhi, Ahmed, Rannap, Maert, Koch, Nils A, Lauxmann, Stephan, Krüger, Johanna, Kegele, Josua, Canafoglia, Laura, Franceschetti, Silvana, Mayer, Thomas, Rebstock, Johannes, Zacher, Pia, Ruf, Susanne, Alber, Michael, Sterbova, Katalin, Lassuthová, Petra, Vlckova, Marketa, Lemke, Johannes R, Platzer, Konrad, Krey, Ilona, Heine, Constanze, Wieczorek, Dagmar, Kroell-Seger, Judith, Lund, Caroline, Klein, Karl Martin, Billie Au, P Y, Rho, Jong M, Ho, Alice W, Masnada, Silvia, Veggiotti, Pierangelo, Giordano, Lucio, Accorsi, Patrizia, Hoei-Hansen, Christina E, Striano, Pasquale, Zara, Federico, Verhelst, Helene, Verhoeven, Judith S, van der Zwaag, Bert, Harder, Aster V E, Brilstra, Eva, Pendziwiat, Manuela, Lebon, Sebastian, Vaccarezza, Maria, Minh Le, Ngoc, Christensen, Jakob, Grønborg, Sabine, Scherer, Stephen W, Howe, Jennifer, Fazeli, Walid, Howell, Katherine B, Leventer, Richard, Stutterd, Chloe, Walsh, Sonja, Gerard, Marion, Gerard, Bénédicte, Matricardi, Sara, Bonardi, Claudia M, Sartori, Stefano, Berger, Andrea, Hoffman-Zacharska, Dorota, Mastrangelo, Massimo, Darra, Francesca, Vøllo, Arve, Motazacker, M Mahdi, Lakeman, Phillis, Nizon, Mathilde, Betzler, Cornelia, Altuzarra, Cecilia, Caume, Roseline, Roubertie, Agathe, Gélisse, Philippe, Marini, Carla, Guerrini, Renzo, Bilan, Frederic, Tibussek, Daniel, Koch-Hogrebe, Margarete, Perry, M Scott, Ichikawa, Shoji, Dadali, Elena, Sharkov, Artem, Mishina, Irina, Abramov, Mikhail, Kanivets, Ilya, Korostelev, Sergey, Kutsev, Sergey, Wain, Karen E, Eisenhauer, Nancy, Wagner, Monisa, Savatt, Juliann M, Müller-Schlüter, Karen, Bassan, Haim, Borovikov, Artem, Nassogne, Marie-Cecile, Destrée, Anne, Schoonjans, An-Sofie, Meuwissen, Marije, Buzatu, Marga, Jansen, Anna, Scalais, Emmanuel, Srivastava, Siddharth, Tan, Wen-Hann, Olson, Heather E, Loddenkemper, Tobias, Poduri, Annapurna, Helbig, Katherine L, Helbig, Ingo, Fitzgerald, Mark P, Goldberg, Ethan M, Roser, Timo, Borggraefe, Ingo, Brünger, Tobias, May, Patrick, Lal, Dennis, Lederer, Damien, Rubboli, Guido, Heyne, Henrike O, Lesca, Gaetan, Hedrich, Ulrike B S, Benda, Jan, Gardella, Elena, Lerche, Holger, and Møller, Rikke S

Published
2022

13. Fourteen new cases contribute to the characterization of the 7q11.23 microduplication syndrome

Author

Van der Aa, Nathalie, Rooms, Liesbeth, Vandeweyer, Geert, van den Ende, Jenneke, Reyniers, Edwin, Fichera, Marco, Romano, Corrado, Delle Chiaie, Barbara, Mortier, Geert, Menten, Björn, Destrée, Anne, Maystadt, Isabelle, Männik, Katrin, Kurg, Ants, Reimand, Tiia, McMullan, Dom, Oley, Christine, Brueton, Louise, Bongers, Ernie M.H.F., van Bon, Bregje W.M., Pfund, Rolph, Jacquemont, Sebastien, Ferrarini, Alessandra, Martinet, Danielle, Schrander-Stumpel, Connie, Stegmann, Alexander P.A., Frints, Suzanna G.M., de Vries, Bert B.A., Ceulemans, Berten, and Kooy, R. Frank

Published
2009
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14. Genotype-phenotype correlations in SCN8A-related disorders reveal prognostic and therapeutic implications

Author

Johannesen, Katrine M., Liu, Yuanyuan, Gjerulfsen, Cathrine E., Koko, Mahmoud, Sonnenberg, Lukas, Schubert, Julian, Fenger, Christina D., Eltokhi, Ahmed, Rannap, Maert, Koch, Nils A., Lauxmann, Stephan, Krüger, Johanna, Kegele, Josua, Canafoglia, Laura, Franceschetti, Silvana, Mayer, Thomas, Rebstock, Johannes, Zacher, Pia, Ruf, Susanne, Alber, Michael, Sterbova, Katalin, Lassuthová, Petra, Vlckova, Marketa, Lemke, Johannes R., Krey, Ilona, Heine, Constanze, Wieczorek, Dagmar, Kroell-Seger, Judith, Lund, Caroline, Klein, Karl Martin, Au, P. Y. Billie, Rho, Jong M., Ho, Alice W., Masnada, Silvia, Veggiotti, Pierangelo, Giordano, Lucio, Accorsi, Patrizia, Hoei-Hansen, Christina E., Striano, Pasquale, Zara, Federico, Verhelst, Helene, S.Verhoeven, Judith, van der Zwaag, Bert, Harder, Aster V. E., Brilstra, Eva, Pendziwiat, Manuela, Lebon, Sebastian, Vaccarezza, Maria, Le, Ngoc Minh, Christensen, Jakob, Schmidt-Petersen, Mette U., Grønborg, Sabine, Scherer, Stephen W., Howe, Jennifer, Fazeli, Walid, Howell, Katherine B., Leventer, Richard, Stutterd, Chloe, Walsh, Sonja, Gerard, Marion, Gerard, Bénédicte, Matricardi, Sara, Bonardi, Claudia M., Sartori, Stefano, Berger, Andrea, Hoffman-Zacharska, Dorota, Mastrangelo, Massimo, Darra, Francesca, Vøllo, Arve, Motazacker, M. Mahdi, Lakeman, Phillis, Nizon, Mathilde, Betzler, Cornelia, Altuzarra, Cecilia, Caume, Roseline, Roubertie, Agathe, Gélisse, Philippe, Marini, Carla, Guerrini, Renzo, Bilan, Frederic, Tibussek, Daniel, Koch-Hogrebe, Margarete, Perry, M. Scott, Ichikawa, Shoji, Dadali, Elena, Sharkov, Artem, Mishina, Irina, Abramov, Mikhail, Kanivets, Ilya, Korostelev, Sergey, Kutsev, Sergey, Wain, Karen E., Eisenhauer, Nancy, Wagner, Monisa, Savatt, Juliann M., Müller-Schlüter, Karen, Bassan, Haim, Borovikov, Artem, Nassogne, Marie-Cecile, Destrée, Anne, Schoonjans, An-Sofie, Meuwissen, Marije, Buzatu, Marga, Jansen, Anna, Scalais, Emmanuel, Srivastava, Siddharth, Tan, Wen-Hann, Olson, Heather E., Loddenkemper, Tobias, Poduri, Annapurna, Helbig, Katherine L., Helbig, Ingo, Fitzgerald, Mark P., Goldberg, Ethan M., Roser, Timo, Borggraefe, Ingo, Brünger, Tobias, May, Patrick, Lal, Dennis, Lederer, Damien, Rubboli, Guido, Lesca, Gaetan, Hedrich, Ulrike B. S., Benda, Jan, Gardella, Elena, Lerche, Holger, Møller, Rikke S., and Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center]

Subjects
Genetics & genetic processes [F10] [Life sciences], Génétique & processus génétiques [F10] [Sciences du vivant]
Abstract

We report detailed functional analyses and genotype-phenotype correlations in 433 individuals carrying disease-causing variants in SCN8A, encoding the voltage-gated Na+ channel NaV1.6. Five different clinical subgroups could be identified: 1) Benign familial infantile epilepsy (BFIE) (n=17, normal cognition, treatable seizures), 2) intermediate epilepsy (n=36, mild ID, partially pharmacoresponsive), 3) developmental and epileptic encephalopathy (DEE, n=191, severe ID, majority pharmacoresistant), 4) generalized epilepsy (n=21, mild to moderate ID, frequently with absence seizures), and 5) affected individuals without epilepsy (n=25, mild to moderate ID). Groups 1-3 presented with early-onset (median: four months) focal or multifocal seizures and epileptic discharges, whereas the onset of seizures in group 4 was later (median: 39 months) with generalized epileptic discharges. The epilepsy was not classifiable in 143 individuals. We performed functional studies expressing missense variants in ND7/23 neuroblastoma cells and primary neuronal cultures using recombinant tetrodotoxin insensitive human NaV1.6 channels and whole-cell patch clamping. Two variants causing DEE showed a strong gain-of-function (GOF, hyperpolarising shift of steady-state activation, strongly increased neuronal firing rate), and one variant causing BFIE or intermediate epilepsy showed a mild GOF (defective fast inactivation, less increased firing). In contrast, all three variants causing generalized epilepsy induced a loss-of-function (LOF, reduced current amplitudes, depolarising shift of steady-state activation, reduced neuronal firing). Including previous studies, functional effects were known for 165 individuals. All 133 individuals carrying GOF variants had either focal (76, groups 1-3), or unclassifiable epilepsy (37), whereas 32 with LOF variants had either generalized (14), no (11) or unclassifiable (5) epilepsy; only two had DEE. Computational modeling in the GOF group revealed a significant correlation between the severity of the electrophysiological and clinical phenotypes. GOF variant carriers responded significantly better to sodium channel blockers (SCBs) than to other anti-seizure medications, and the same applied for all individuals of groups 1-3.In conclusion, our data reveal clear genotype-phenotype correlations between age at seizure onset, type of epilepsy and gain- or loss-of-function effects of SCN8A variants. Generalized epilepsy with absence seizures is the main epilepsy phenotype of LOF variant carriers and the extent of the electrophysiological dysfunction of the GOF variants is a main determinant of the severity of the clinical phenotype in focal epilepsies. Our pharmacological data indicate that SCBs present a therapeutic treatment option in early onset SCN8A-related focal epilepsy.

Published
2021

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

Author

Johannesen, Katrine M, primary, Liu, Yuanyuan, additional, Koko, Mahmoud, additional, Gjerulfsen, Cathrine E, additional, Sonnenberg, Lukas, additional, Schubert, Julian, additional, Fenger, Christina D, additional, Eltokhi, Ahmed, additional, Rannap, Maert, additional, Koch, Nils A, additional, Lauxmann, Stephan, additional, Krüger, Johanna, additional, Kegele, Josua, additional, Canafoglia, Laura, additional, Franceschetti, Silvana, additional, Mayer, Thomas, additional, Rebstock, Johannes, additional, Zacher, Pia, additional, Ruf, Susanne, additional, Alber, Michael, additional, Sterbova, Katalin, additional, Lassuthová, Petra, additional, Vlckova, Marketa, additional, Lemke, Johannes R, additional, Platzer, Konrad, additional, Krey, Ilona, additional, Heine, Constanze, additional, Wieczorek, Dagmar, additional, Kroell-Seger, Judith, additional, Lund, Caroline, additional, Klein, Karl Martin, additional, Au, P Y Billie, additional, Rho, Jong M, additional, Ho, Alice W, additional, Masnada, Silvia, additional, Veggiotti, Pierangelo, additional, Giordano, Lucio, additional, Accorsi, Patrizia, additional, Hoei-Hansen, Christina E, additional, Striano, Pasquale, additional, Zara, Federico, additional, Verhelst, Helene, additional, Verhoeven, Judith S, additional, Braakman, Hilde M H, additional, van der Zwaag, Bert, additional, Harder, Aster V E, additional, Brilstra, Eva, additional, Pendziwiat, Manuela, additional, Lebon, Sebastian, additional, Vaccarezza, Maria, additional, Le, Ngoc Minh, additional, Christensen, Jakob, additional, Grønborg, Sabine, additional, Scherer, Stephen W, additional, Howe, Jennifer, additional, Fazeli, Walid, additional, Howell, Katherine B, additional, Leventer, Richard, additional, Stutterd, Chloe, additional, Walsh, Sonja, additional, Gerard, Marion, additional, Gerard, Bénédicte, additional, Matricardi, Sara, additional, Bonardi, Claudia M, additional, Sartori, Stefano, additional, Berger, Andrea, additional, Hoffman-Zacharska, Dorota, additional, Mastrangelo, Massimo, additional, Darra, Francesca, additional, Vøllo, Arve, additional, Motazacker, M Mahdi, additional, Lakeman, Phillis, additional, Nizon, Mathilde, additional, Betzler, Cornelia, additional, Altuzarra, Cecilia, additional, Caume, Roseline, additional, Roubertie, Agathe, additional, Gélisse, Philippe, additional, Marini, Carla, additional, Guerrini, Renzo, additional, Bilan, Frederic, additional, Tibussek, Daniel, additional, Koch-Hogrebe, Margarete, additional, Perry, M Scott, additional, Ichikawa, Shoji, additional, Dadali, Elena, additional, Sharkov, Artem, additional, Mishina, Irina, additional, Abramov, Mikhail, additional, Kanivets, Ilya, additional, Korostelev, Sergey, additional, Kutsev, Sergey, additional, Wain, Karen E, additional, Eisenhauer, Nancy, additional, Wagner, Monisa, additional, Savatt, Juliann M, additional, Müller-Schlüter, Karen, additional, Bassan, Haim, additional, Borovikov, Artem, additional, Nassogne, Marie Cecile, additional, Destrée, Anne, additional, Schoonjans, An Sofie, additional, Meuwissen, Marije, additional, Buzatu, Marga, additional, Jansen, Anna, additional, Scalais, Emmanuel, additional, Srivastava, Siddharth, additional, Tan, Wen Hann, additional, Olson, Heather E, additional, Loddenkemper, Tobias, additional, Poduri, Annapurna, additional, Helbig, Katherine L, additional, Helbig, Ingo, additional, Fitzgerald, Mark P, additional, Goldberg, Ethan M, additional, Roser, Timo, additional, Borggraefe, Ingo, additional, Brünger, Tobias, additional, May, Patrick, additional, Lal, Dennis, additional, Lederer, Damien, additional, Rubboli, Guido, additional, Heyne, Henrike O, additional, Lesca, Gaetan, additional, Hedrich, Ulrike B S, additional, Benda, Jan, additional, Gardella, Elena, additional, Lerche, Holger, additional, and Møller, Rikke S, additional

Published
2021
Full Text
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16. Genotype-phenotype correlations in SCN8A-related disorders reveal prognostic and therapeutic implications

Author

Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], Johannesen, Katrine M., Liu, Yuanyuan, Gjerulfsen, Cathrine E., Koko, Mahmoud, Sonnenberg, Lukas, Schubert, Julian, Fenger, Christina D., Eltokhi, Ahmed, Rannap, Maert, Koch, Nils A., Lauxmann, Stephan, Krüger, Johanna, Kegele, Josua, Canafoglia, Laura, Franceschetti, Silvana, Mayer, Thomas, Rebstock, Johannes, Zacher, Pia, Ruf, Susanne, Alber, Michael, Sterbova, Katalin, Lassuthová, Petra, Vlckova, Marketa, Lemke, Johannes R., Krey, Ilona, Heine, Constanze, Wieczorek, Dagmar, Kroell-Seger, Judith, Lund, Caroline, Klein, Karl Martin, Au, P. Y. Billie, Rho, Jong M., Ho, Alice W., Masnada, Silvia, Veggiotti, Pierangelo, Giordano, Lucio, Accorsi, Patrizia, Hoei-Hansen, Christina E., Striano, Pasquale, Zara, Federico, Verhelst, Helene, S.Verhoeven, Judith, van der Zwaag, Bert, Harder, Aster V. E., Brilstra, Eva, Pendziwiat, Manuela, Lebon, Sebastian, Vaccarezza, Maria, Le, Ngoc Minh, Christensen, Jakob, Schmidt-Petersen, Mette U., Grønborg, Sabine, Scherer, Stephen W., Howe, Jennifer, Fazeli, Walid, Howell, Katherine B., Leventer, Richard, Stutterd, Chloe, Walsh, Sonja, Gerard, Marion, Gerard, Bénédicte, Matricardi, Sara, Bonardi, Claudia M., Sartori, Stefano, Berger, Andrea, Hoffman-Zacharska, Dorota, Mastrangelo, Massimo, Darra, Francesca, Vøllo, Arve, Motazacker, M. Mahdi, Lakeman, Phillis, Nizon, Mathilde, Betzler, Cornelia, Altuzarra, Cecilia, Caume, Roseline, Roubertie, Agathe, Gélisse, Philippe, Marini, Carla, Guerrini, Renzo, Bilan, Frederic, Tibussek, Daniel, Koch-Hogrebe, Margarete, Perry, M. Scott, Ichikawa, Shoji, Dadali, Elena, Sharkov, Artem, Mishina, Irina, Abramov, Mikhail, Kanivets, Ilya, Korostelev, Sergey, Kutsev, Sergey, Wain, Karen E., Eisenhauer, Nancy, Wagner, Monisa, Savatt, Juliann M., Müller-Schlüter, Karen, Bassan, Haim, Borovikov, Artem, Nassogne, Marie-Cecile, Destrée, Anne, Schoonjans, An-Sofie, Meuwissen, Marije, Buzatu, Marga, Jansen, Anna, Scalais, Emmanuel, Srivastava, Siddharth, Tan, Wen-Hann, Olson, Heather E., Loddenkemper, Tobias, Poduri, Annapurna, Helbig, Katherine L., Helbig, Ingo, Fitzgerald, Mark P., Goldberg, Ethan M., Roser, Timo, Borggraefe, Ingo, Brünger, Tobias, May, Patrick, Lal, Dennis, Lederer, Damien, Rubboli, Guido, Lesca, Gaetan, Hedrich, Ulrike B. S., Benda, Jan, Gardella, Elena, Lerche, Holger, Møller, Rikke S., Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], Johannesen, Katrine M., Liu, Yuanyuan, Gjerulfsen, Cathrine E., Koko, Mahmoud, Sonnenberg, Lukas, Schubert, Julian, Fenger, Christina D., Eltokhi, Ahmed, Rannap, Maert, Koch, Nils A., Lauxmann, Stephan, Krüger, Johanna, Kegele, Josua, Canafoglia, Laura, Franceschetti, Silvana, Mayer, Thomas, Rebstock, Johannes, Zacher, Pia, Ruf, Susanne, Alber, Michael, Sterbova, Katalin, Lassuthová, Petra, Vlckova, Marketa, Lemke, Johannes R., Krey, Ilona, Heine, Constanze, Wieczorek, Dagmar, Kroell-Seger, Judith, Lund, Caroline, Klein, Karl Martin, Au, P. Y. Billie, Rho, Jong M., Ho, Alice W., Masnada, Silvia, Veggiotti, Pierangelo, Giordano, Lucio, Accorsi, Patrizia, Hoei-Hansen, Christina E., Striano, Pasquale, Zara, Federico, Verhelst, Helene, S.Verhoeven, Judith, van der Zwaag, Bert, Harder, Aster V. E., Brilstra, Eva, Pendziwiat, Manuela, Lebon, Sebastian, Vaccarezza, Maria, Le, Ngoc Minh, Christensen, Jakob, Schmidt-Petersen, Mette U., Grønborg, Sabine, Scherer, Stephen W., Howe, Jennifer, Fazeli, Walid, Howell, Katherine B., Leventer, Richard, Stutterd, Chloe, Walsh, Sonja, Gerard, Marion, Gerard, Bénédicte, Matricardi, Sara, Bonardi, Claudia M., Sartori, Stefano, Berger, Andrea, Hoffman-Zacharska, Dorota, Mastrangelo, Massimo, Darra, Francesca, Vøllo, Arve, Motazacker, M. Mahdi, Lakeman, Phillis, Nizon, Mathilde, Betzler, Cornelia, Altuzarra, Cecilia, Caume, Roseline, Roubertie, Agathe, Gélisse, Philippe, Marini, Carla, Guerrini, Renzo, Bilan, Frederic, Tibussek, Daniel, Koch-Hogrebe, Margarete, Perry, M. Scott, Ichikawa, Shoji, Dadali, Elena, Sharkov, Artem, Mishina, Irina, Abramov, Mikhail, Kanivets, Ilya, Korostelev, Sergey, Kutsev, Sergey, Wain, Karen E., Eisenhauer, Nancy, Wagner, Monisa, Savatt, Juliann M., Müller-Schlüter, Karen, Bassan, Haim, Borovikov, Artem, Nassogne, Marie-Cecile, Destrée, Anne, Schoonjans, An-Sofie, Meuwissen, Marije, Buzatu, Marga, Jansen, Anna, Scalais, Emmanuel, Srivastava, Siddharth, Tan, Wen-Hann, Olson, Heather E., Loddenkemper, Tobias, Poduri, Annapurna, Helbig, Katherine L., Helbig, Ingo, Fitzgerald, Mark P., Goldberg, Ethan M., Roser, Timo, Borggraefe, Ingo, Brünger, Tobias, May, Patrick, Lal, Dennis, Lederer, Damien, Rubboli, Guido, Lesca, Gaetan, Hedrich, Ulrike B. S., Benda, Jan, Gardella, Elena, Lerche, Holger, and Møller, Rikke S.

Abstract

We report detailed functional analyses and genotype-phenotype correlations in 433 individuals carrying disease-causing variants in SCN8A, encoding the voltage-gated Na+ channel NaV1.6. Five different clinical subgroups could be identified: 1) Benign familial infantile epilepsy (BFIE) (n=17, normal cognition, treatable seizures), 2) intermediate epilepsy (n=36, mild ID, partially pharmacoresponsive), 3) developmental and epileptic encephalopathy (DEE, n=191, severe ID, majority pharmacoresistant), 4) generalized epilepsy (n=21, mild to moderate ID, frequently with absence seizures), and 5) affected individuals without epilepsy (n=25, mild to moderate ID). Groups 1-3 presented with early-onset (median: four months) focal or multifocal seizures and epileptic discharges, whereas the onset of seizures in group 4 was later (median: 39 months) with generalized epileptic discharges. The epilepsy was not classifiable in 143 individuals. We performed functional studies expressing missense variants in ND7/23 neuroblastoma cells and primary neuronal cultures using recombinant tetrodotoxin insensitive human NaV1.6 channels and whole-cell patch clamping. Two variants causing DEE showed a strong gain-of-function (GOF, hyperpolarising shift of steady-state activation, strongly increased neuronal firing rate), and one variant causing BFIE or intermediate epilepsy showed a mild GOF (defective fast inactivation, less increased firing). In contrast, all three variants causing generalized epilepsy induced a loss-of-function (LOF, reduced current amplitudes, depolarising shift of steady-state activation, reduced neuronal firing). Including previous studies, functional effects were known for 165 individuals. All 133 individuals carrying GOF variants had either focal (76, groups 1-3), or unclassifiable epilepsy (37), whereas 32 with LOF variants had either generalized (14), no (11) or unclassifiable (5) epilepsy; only two had DEE. Computational modeling in the GOF group revealed a signific

Published
2021

17. Prenatally detected copy number variants in a national cohort: A postnatal follow-up study.

Author

UCL - SSS/IREC/SLUC - Pôle St.-Luc, UCL - (SLuc) Centre de génétique médicale UCL, Muys, Joke, Jacquemyn, Yves, Blaumeiser, Bettina, Bourlard, Laura, Brison, Nathalie, Bulk, Saskia, Chiarappa, Patrizia, De Leener, Anne, De Rademaeker, Marjan, Désir, Julie, Destrée, Anne, Devriendt, Koenraad, Dheedene, Annelies, Duquenne, Armelle, Fieuw, Annelies, Fransen, Erik, Gatot, Jean-Stéphane, Jamar, Mauricette, Janssens, Sandra, Kerstjens, Jorien, Keymolen, Kathelijn, Lederer, Damien, Menten, Björn, Pichon, Bruno, Rombout, Sonia, Sznajer, Yves, Van Den Bogaert, Ann, Van Den Bogaert, Kris, Vermeesch, Joris, Janssens, Katrien, UCL - SSS/IREC/SLUC - Pôle St.-Luc, UCL - (SLuc) Centre de génétique médicale UCL, Muys, Joke, Jacquemyn, Yves, Blaumeiser, Bettina, Bourlard, Laura, Brison, Nathalie, Bulk, Saskia, Chiarappa, Patrizia, De Leener, Anne, De Rademaeker, Marjan, Désir, Julie, Destrée, Anne, Devriendt, Koenraad, Dheedene, Annelies, Duquenne, Armelle, Fieuw, Annelies, Fransen, Erik, Gatot, Jean-Stéphane, Jamar, Mauricette, Janssens, Sandra, Kerstjens, Jorien, Keymolen, Kathelijn, Lederer, Damien, Menten, Björn, Pichon, Bruno, Rombout, Sonia, Sznajer, Yves, Van Den Bogaert, Ann, Van Den Bogaert, Kris, Vermeesch, Joris, and Janssens, Katrien

Abstract

OBJECTIVE: Belgian genetic centers established a database containing data on all chromosomal microarrays performed in a prenatal context. A study was initiated to evaluate postnatal development in children diagnosed prenatally with a non-benign copy number variant (CNV). METHODS: All children diagnosed with a prenatally detected non-benign CNV in a Belgian genetic center between May 2013 and February 2015 were included in the patient population. The control population consisted of children who had undergone an invasive procedure during pregnancy, with no or only benign CNVs. Child development was evaluated at 36 months using three (3) questionnaires: Ages and Stages Questionnaire Third edition, Ages and Stages Questionnaire Social-Emotional Second Edition and a general questionnaire. RESULTS: A significant difference in communication and personal-social development was detected between children with a reported susceptibility CNV and both children with an unreported susceptibility CNV and the control population. The outcome of children with a particular CNV is discussed in a case-by-case manner. CONCLUSION: Our postnatal follow-up project of children with a prenatally detected non-benign CNV is the first nationwide project of its kind. A higher number of cases for each CNV category is however needed to confirm our findings.

Published
2020

18. Prenatally detected copy number variants in a national cohort: A postnatal follow‐up study

Author

Muys, Joke, primary, Jacquemyn, Yves, additional, Blaumeiser, Bettina, additional, Bourlard, Laura, additional, Brison, Nathalie, additional, Bulk, Saskia, additional, Chiarappa, Patrizia, additional, De Leener, Anne, additional, De Rademaeker, Marjan, additional, Désir, Julie, additional, Destrée, Anne, additional, Devriendt, Koenraad, additional, Dheedene, Annelies, additional, Duquenne, Armelle, additional, Fieuw, Annelies, additional, Fransen, Erik, additional, Gatot, Jean‐Stéphane, additional, Jamar, Mauricette, additional, Janssens, Sandra, additional, Kerstjens, Jorien, additional, Keymolen, Kathelijn, additional, Lederer, Damien, additional, Menten, Björn, additional, Pichon, Bruno, additional, Rombout, Sonia, additional, Sznajer, Yves, additional, Van Den Bogaert, Ann, additional, Van Den Bogaert, Kris, additional, Vermeesch, Joris, additional, and Janssens, Katrien, additional

Published
2020
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20. A clinical scoring system for congenital contractural arachnodactyly.

Author

Meerschaut, Ilse, De Coninck, Shana, Steyaert, Wouter, Barnicoat, Angela, Bayat, Allan, Benedicenti, Francesco, Berland, Siren, Blair, Edward M, Breckpot, Jeroen, de Burca, Anna, Destrée, Anne, García-Miñaúr, Sixto, Green, Andrew J, Hanna, Bernadette C, Keymolen, Kathelijn, Koopmans, Marije, Lederer, Damien, Lees, Melissa, Longman, Cheryl, Lynch, Sally Ann, Male, Alison M, McKenzie, Fiona, Migeotte, Isabelle, Mihci, Ercan, Nur, Banu, Petit, Florence, Piard, Juliette, Plasschaert, Frank FS, Rauch, Anita, Ribai A Nyam, Pascale, Pacheco, Iratxe Salcedo, Stanzial, Franco, Stolte-Dijkstra, Irene, Valenzuela, Irene, Varghese, Vinod, Vasudevan, Pradeep C, Wakeling, Emma L, Wallgren-Pettersson, Carina, Coucke, Paul, De Paepe, Anne, De Wolf, Daniël, Symoens, Sofie, Callewaert, Bert, Meerschaut, Ilse, De Coninck, Shana, Steyaert, Wouter, Barnicoat, Angela, Bayat, Allan, Benedicenti, Francesco, Berland, Siren, Blair, Edward M, Breckpot, Jeroen, de Burca, Anna, Destrée, Anne, García-Miñaúr, Sixto, Green, Andrew J, Hanna, Bernadette C, Keymolen, Kathelijn, Koopmans, Marije, Lederer, Damien, Lees, Melissa, Longman, Cheryl, Lynch, Sally Ann, Male, Alison M, McKenzie, Fiona, Migeotte, Isabelle, Mihci, Ercan, Nur, Banu, Petit, Florence, Piard, Juliette, Plasschaert, Frank FS, Rauch, Anita, Ribai A Nyam, Pascale, Pacheco, Iratxe Salcedo, Stanzial, Franco, Stolte-Dijkstra, Irene, Valenzuela, Irene, Varghese, Vinod, Vasudevan, Pradeep C, Wakeling, Emma L, Wallgren-Pettersson, Carina, Coucke, Paul, De Paepe, Anne, De Wolf, Daniël, Symoens, Sofie, and Callewaert, Bert

Abstract

Congenital contractural arachnodactyly (CCA) is an autosomal dominant connective tissue disorder manifesting joint contractures, arachnodactyly, crumpled ears, and kyphoscoliosis as main features. Due to its rarity, rather aspecific clinical presentation, and overlap with other conditions including Marfan syndrome, the diagnosis is challenging, but important for prognosis and clinical management. CCA is caused by pathogenic variants in FBN2, encoding fibrillin-2, but locus heterogeneity has been suggested. We designed a clinical scoring system and diagnostic criteria to support the diagnostic process and guide molecular genetic testing., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2019

21. The Belgian MicroArray Prenatal (BEMAPRE) database: A systematic nationwide repository of fetal genomic aberrations.

Author

UCL - SSS/IREC/SLUC - Pôle St.-Luc, UCL - (SLuc) Centre de génétique médicale UCL, Muys, Joke, Blaumeiser, Bettina, Jacquemyn, Yves, Bandelier, Claude, Brison, Nathalie, Bulk, Saskia, Chiarappa, Patrizia, Courtens, Winnie, De Leener, Anne, De Rademaeker, Marjan, Désir, Julie, Destrée, Anne, Devriendt, Koenraad, Dheedene, Annelies, Fieuw, Annelies, Fransen, Erik, Gatot, Jean-Stéphane, Holmgren, Philip, Jamar, Mauricette, Janssens, Sandra, Keymolen, Kathelijn, Lederer, Damien, Menten, Björn, Meuwissen, Marije, Parmentier, Benoit, Pichon, Bruno, Rombout, Sonia, Sznajer, Yves, Van Den Bogaert, Ann, Van Den Bogaert, Kris, Vanakker, Olivier, Vermeesch, Joris, Janssens, Katrien, UCL - SSS/IREC/SLUC - Pôle St.-Luc, UCL - (SLuc) Centre de génétique médicale UCL, Muys, Joke, Blaumeiser, Bettina, Jacquemyn, Yves, Bandelier, Claude, Brison, Nathalie, Bulk, Saskia, Chiarappa, Patrizia, Courtens, Winnie, De Leener, Anne, De Rademaeker, Marjan, Désir, Julie, Destrée, Anne, Devriendt, Koenraad, Dheedene, Annelies, Fieuw, Annelies, Fransen, Erik, Gatot, Jean-Stéphane, Holmgren, Philip, Jamar, Mauricette, Janssens, Sandra, Keymolen, Kathelijn, Lederer, Damien, Menten, Björn, Meuwissen, Marije, Parmentier, Benoit, Pichon, Bruno, Rombout, Sonia, Sznajer, Yves, Van Den Bogaert, Ann, Van Den Bogaert, Kris, Vanakker, Olivier, Vermeesch, Joris, and Janssens, Katrien

Abstract

OBJECTIVE: With the replacement of karyotyping by chromosomal microarray (CMA) in invasive prenatal diagnosis, new challenges have arisen. By building a national database, we standardize the classification and reporting of prenatally detected copy number variants (CNVs) across Belgian genetic centers. This database, which will link genetic and ultrasound findings with postnatal development, forms a unique resource to investigate the pathogenicity of variants of uncertain significance and to refine the phenotypic spectrum of pathogenic and susceptibility CNVs. METHODS: The Belgian MicroArray Prenatal (BEMAPRE) consortium is a collaboration of all genetic centers in Belgium. We collected data from all invasive prenatal procedures performed between May 2013 and July 2016. RESULTS: In this three-year period, 13 266 prenatal CMAs were performed. By national agreement, a limited number of susceptibility CNVs and no variants of uncertain significance were reported. Added values for using CMA versus conventional karyotyping were 1.8% in the general invasive population and 2.7% in cases with an ultrasound anomaly. Of the reported CNVs, 31.5% would have remained undetected with non-invasive prenatal test as the first-tier test. CONCLUSION: The establishment of a national database for prenatal CNV data allows for a uniform reporting policy and the investigation of the prenatal and postnatal genotype-phenotype correlation.

Published
2018

22. The Belgian MicroArray Prenatal (BEMAPRE) database: A systematic nationwide repository of fetal genomic aberrations

Author

Muys, Joke, primary, Blaumeiser, Bettina, additional, Jacquemyn, Yves, additional, Bandelier, Claude, additional, Brison, Nathalie, additional, Bulk, Saskia, additional, Chiarappa, Patrizia, additional, Courtens, Winnie, additional, De Leener, Anne, additional, De Rademaeker, Marjan, additional, Désir, Julie, additional, Destrée, Anne, additional, Devriendt, Koenraad, additional, Dheedene, Annelies, additional, Fieuw, Annelies, additional, Fransen, Erik, additional, Gatot, Jean‐Stéphane, additional, Holmgren, Philip, additional, Jamar, Mauricette, additional, Janssens, Sandra, additional, Keymolen, Kathelijn, additional, Lederer, Damien, additional, Menten, Björn, additional, Meuwissen, Marije, additional, Parmentier, Benoit, additional, Pichon, Bruno, additional, Rombout, Sonia, additional, Sznajer, Yves, additional, Van Den Bogaert, Ann, additional, Van Den Bogaert, Kris, additional, Vanakker, Olivier, additional, Vermeesch, Joris, additional, and Janssens, Katrien, additional

Published
2018
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23. Genotype-Phenotype Correlation in NF1: Evidence for a More Severe Phenotype Associated with Missense Mutations Affecting NF1 Codons 844–848

Author

Koczkowska, Magdalena, primary, Chen, Yunjia, additional, Callens, Tom, additional, Gomes, Alicia, additional, Sharp, Angela, additional, Johnson, Sherrell, additional, Hsiao, Meng-Chang, additional, Chen, Zhenbin, additional, Balasubramanian, Meena, additional, Barnett, Christopher P., additional, Becker, Troy A., additional, Ben-Shachar, Shay, additional, Bertola, Debora R., additional, Blakeley, Jaishri O., additional, Burkitt-Wright, Emma M.M., additional, Callaway, Alison, additional, Crenshaw, Melissa, additional, Cunha, Karin S., additional, Cunningham, Mitch, additional, D’Agostino, Maria D., additional, Dahan, Karin, additional, De Luca, Alessandro, additional, Destrée, Anne, additional, Dhamija, Radhika, additional, Eoli, Marica, additional, Evans, D. Gareth R., additional, Galvin-Parton, Patricia, additional, George-Abraham, Jaya K., additional, Gripp, Karen W., additional, Guevara-Campos, Jose, additional, Hanchard, Neil A., additional, Hernández-Chico, Concepcion, additional, Immken, LaDonna, additional, Janssens, Sandra, additional, Jones, Kristi J., additional, Keena, Beth A., additional, Kochhar, Aaina, additional, Liebelt, Jan, additional, Martir-Negron, Arelis, additional, Mahoney, Maurice J., additional, Maystadt, Isabelle, additional, McDougall, Carey, additional, McEntagart, Meriel, additional, Mendelsohn, Nancy, additional, Miller, David T., additional, Mortier, Geert, additional, Morton, Jenny, additional, Pappas, John, additional, Plotkin, Scott R., additional, Pond, Dinel, additional, Rosenbaum, Kenneth, additional, Rubin, Karol, additional, Russell, Laura, additional, Rutledge, Lane S., additional, Saletti, Veronica, additional, Schonberg, Rhonda, additional, Schreiber, Allison, additional, Seidel, Meredith, additional, Siqveland, Elizabeth, additional, Stockton, David W., additional, Trevisson, Eva, additional, Ullrich, Nicole J., additional, Upadhyaya, Meena, additional, van Minkelen, Rick, additional, Verhelst, Helene, additional, Wallace, Margaret R., additional, Yap, Yoon-Sim, additional, Zackai, Elaine, additional, Zonana, Jonathan, additional, Zurcher, Vickie, additional, Claes, Kathleen, additional, Martin, Yolanda, additional, Korf, Bruce R., additional, Legius, Eric, additional, and Messiaen, Ludwine M., additional

Published
2018
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24. Further delineation of the KAT6B molecular and phenotypic spectrum

Author

DDD study, Gannon, Tamsin, Perveen, Rahat, Schlecht, Hélene, Ramsden, Simon, Anderson, Beverley, Kerr, Bronwyn, Day, Ruth, Banka, Siddharth, Suri, Mohnish, Berland, Siren, Gabbett, Michael, Ma, Alan, Lyonnet, Stan, Cormier-Daire, Valerie, Yilmaz, Rüstem, Borck, Guntram, Wieczorek, Dagmar, Anderlid, Britt-Marie, Smithson, Sarah, Vogt, Julie, Moore-Barton, Heather, Simsek-Kiper, Pelin Ozlem, Maystadt, Isabelle, Destrée, Anne, Bucher, Jessica, Angle, Brad, Mohammed, Shehla, Wakeling, Emma, Price, Sue, Singer, Amihood, Sznajer, Yves, Toutain, Annick, Haye, Damien, Newbury-Ecob, Ruth, Fradin, Melanie, McGaughran, Julie, Tuysuz, Beyhan, Tein, Mark, Bouman, Katelijne, Dabir, Tabib, Van den Ende, Jenneke, Luk, Ho Ming, Pilz, Daniela T, Eason, Jacqueline, Davies, Sally, Reardon, Willie, Garavelli, Livia, Zuffardi, Orsetta, Devriendt, Koen, Armstrong, Ruth, Johnson, Diana, Doco-Fenzy, Martine, Bijlsma, Emilia, Unger, Sheila, Veenstra-Knol, Hermine E, Kohlhase, Jürgen, Lo, Ivan FM, Smith, Janine, Clayton-Smith, Jill, Regional Genetic Service, St Mary's Hospital, Manchester, Clinical Genetics Service, Nottingham University Hospitals NHS Trust, Haukeland University Hospital, Royal Brsibane and Womens' Hospital, The University of Queensland, Department of Clinical Genetics, Children’s Hospital at Westmead, Service de génétique médicale, AP-HP Hôpital Necker - Enfants Malades [Paris], Institute of Human Genetics, Universität Ulm, Institut für Humangenetik [Essen], Universitätsklinikum Essen, Karolinska University Hospital, Karolinska University Hospital [Stockholm], University Hospitals Bristol, University of Birmingham [Birmingham], Hacettepe University Children's Hospital, Centre de Génétique Humaine, Institut de Pathologie et de Génétique, Division of Genetics, Birth Defects and Metabolism, Children's hospital of Chicago, Clinical Genetics, Guy's Hospital [London], North West london hospitals NHS Trust, Department of Clinical Genetics, Northampton General Hospital, Northampton, Barzilai Medical Center, Cliniques Universitaires St Luc, Université Catholique de Louvain (UCL), Service de génétique [Tours], Hôpital Bretonneau - CHRU Tours, Institut de Génétique et Développement de Rennes (IGDR), Université de Rennes 1 (UR1) - Centre National de la Recherche Scientifique (CNRS) - Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Service de génétique clinique [Rennes], Université de Rennes 1 (UR1) - CHU Pontchaillou [Rennes] - Hôpital Sud, Pediatrics, Istanbul University Cerrahpasa, Birmingham Women’s Hospital, University of Groningen [Groningen], Belfast City Hospital, Centre For Medical Genetics, Clinical Genetic Service, Department of Health, Institute of Medical Genetics, Heath Park, Cardiff, National Centre for Medical Genetics, Our Lady's Children's Hospital, Crumlin OLCHC, Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Fondazione 'Istituto Neurologico Nazionale C. Mondino', Dipartimento di Medicina Molecolare, University of Pavia, UZ Leuven - campus Gasthuisberg, East Anglian Medical Genetics Service, Cytogenetics Laboratory, Addenbrooke's Hospital, Sheffield Children’s Hospital, Service de Génétique, CHU Reims - Hôpital Maison Blanche - IFR 53, Leiden University Medical Center, Service de Génétique humaine, Université de Lausanne (UNIL), Çocuk Sağlığı ve Hastalıkları, University of Bergen (UiB), Westmead Hospital [Sydney], CHU Necker - Enfants Malades [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Universität Ulm - Ulm University [Ulm, Allemagne], Institute of Human Genetics - Institut für Humangenetik [Essen], Universitätsklinikum Essen [Universität Duisburg-Essen] (Uniklinik Essen)-Universitat Duisberg-Essen, Cliniques Universitaires Saint-Luc [Bruxelles], Centre Hospitalier Régional Universitaire de Tours (CHRU Tours)-Hôpital Bretonneau, Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Structure Fédérative de Recherche en Biologie et Santé de Rennes ( Biosit : Biologie - Santé - Innovation Technologique ), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-CHU Pontchaillou [Rennes]-hôpital Sud, Sheffield Children's NHS Foundation Trust, Centre Hospitalier Universitaire de Reims (CHU Reims)-Hôpital Maison Blanche-IFR 53, Université de Reims Champagne-Ardenne (URCA)-Université de Reims Champagne-Ardenne (URCA), Leiden University Medical Center (LUMC), UCL - SSS/IREC - Institut de recherche expérimentale et clinique, UCL - (SLuc) Centre de génétique médicale UCL, Nottingham University Hospitals NHS Trust (NUH), 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 ), Université de Rennes (UR)-CHU Pontchaillou [Rennes]-hôpital Sud, Università degli Studi di Pavia = University of Pavia (UNIPV), Universiteit Leiden-Universiteit Leiden, Université de Lausanne = University of Lausanne (UNIL), DDD study, and Hôpital Bretonneau-Centre Hospitalier Régional Universitaire de Tours (CHRU Tours)

Subjects
Male, DNA Mutational Analysis, Medizin, Gene Expression, Kidney, Severity of Illness Index, Craniofacial Abnormalities, Missense mutation, Exome, Genetics (clinical), Histone Acetyltransferases, Genetics, OHDO SYNDROME, Patella, Exons, Hypotonia, 3. Good health, Blepharophimosis/diagnosis, Blepharophimosis/genetics, Child, Preschool, Congenital Hypothyroidism/diagnosis, Congenital Hypothyroidism/genetics, Craniofacial Abnormalities/diagnosis, Craniofacial Abnormalities/genetics, Diagnosis, Differential, Facies, Female, Genetic Association Studies, Genotype, Heart Defects, Congenital/diagnosis, Heart Defects, Congenital/genetics, Histone Acetyltransferases/genetics, Humans, Intellectual Disability/diagnosis, Intellectual Disability/genetics, Joint Instability/diagnosis, Joint Instability/genetics, Kidney/abnormalities, Kidney/pathology, Mutation, Patella/abnormalities, Patella/pathology, Phenotype, Psychomotor Disorders/diagnosis, Psychomotor Disorders/genetics, Scrotum/abnormalities, Scrotum/pathology, Urogenital Abnormalities/diagnosis, Urogenital Abnormalities/genetics, Scrotum, Medical genetics, genitopatellar, Say-Barber-Biesecker, medicine.symptom, Psychomotor disorder, Haploinsufficiency, Heart Defects, Congenital, Joint Instability, medicine.medical_specialty, Biology, Blepharophimosis, [SDV.GEN.GH] Life Sciences [q-bio]/Genetics/Human genetics, KAT6B, Article, Intellectual Disability, medicine, Congenital Hypothyroidism, CAUSE GENITOPATELLAR SYNDROME, medicine.disease, blepharophimosis, [SDV.GEN.GH]Life Sciences [q-bio]/Genetics/Human genetics, DE-NOVO MUTATIONS, Urogenital Abnormalities, Genitopatellar syndrome, HISTONE ACETYLTRANSFERASE KAT6B, Psychomotor Disorders, MENTAL-RETARDATION
Abstract

International audience; KAT6B sequence variants have been identified previously in both patients with the Say-Barber-Biesecker type of blepharophimosis mental retardation syndromes (SBBS) and in the more severe genitopatellar syndrome (GPS). We report on the findings in a previously unreported group of 57 individuals with suggestive features of SBBS or GPS. Likely causative variants have been identified in 34/57 patients and were commonly located in the terminal exons of KAT6B. Of those where parental samples could be tested, all occurred de novo. Thirty out of thirty-four had truncating variants, one had a missense variant and the remaining three had the same synonymous change predicted to affect splicing. Variants in GPS tended to occur more proximally to those in SBBS patients, and genotype/phenotype analysis demonstrated significant clinical overlap between SBBS and GPS. The de novo synonymous change seen in three patients with features of SBBS occurred more proximally in exon 16. Statistical analysis of clinical features demonstrated that KAT6B variant-positive patients were more likely to display hypotonia, feeding difficulties, long thumbs/great toes and dental, thyroid and patella abnormalities than KAT6B variant-negative patients. The few reported patients with KAT6B haploinsufficiency had a much milder phenotype, though with some features overlapping those of SBBS. We report the findings in a previously unreported patient with a deletion of the KAT6B gene to further delineate the haploinsufficiency phenotype. The molecular mechanisms giving rise to the SBBS and GPS phenotypes are discussed.

Published
2015

25. STXBP1 encephalopathy

Author

Stamberger, Hannah, Nikanorova, Marina, Willemsen, Marjolein H., Accorsi, Patrizia, Angriman, Marco, Baier, Hartmut, Benkel-Herrenbrueck, Ira, Benoit, Valérie, Budetta, Mauro, Caliebe, Almuth, Cantalupo, Gaetano, Capovilla, Giuseppe, Casara, Gianluca, Courage, Carolina, Deprez, Marie, Destrée, Anne, Dilena, Robertino, Erasmus, Corrie E., Fannemel, Madeleine, Fjær, Roar, Giordano, Lucio, Helbig, Katherine L, Heyne, Henrike O., Klepper, Joerg, Kluger, Gerhard J., Lederer, Damien, Lodi, Monica, Maier, Oliver, Merkenschlager, Andreas, Michelberger, Nina, Minetti, Carlo, Muhle, Hiltrud, Phalin, Judith, Ramsey, Keri, Romeo, Antonino, Schallner, Jens, Schanze, Ina, Shinawi, Marwan, Sleegers, Kristel, Sterbova, Katalin, Syrbe, Steffen, Traverso, Monica, Tzschach, Andreas, Uldall, Peter, Van Coster, Rudy, Verhelst, Helene, Viri, Maurizio, Winter, Susan, Wolff, Markus, Zenker, Martin, Zoccante, Leonardo, De Jonghe, Peter, Helbig, Ingo, Striano, Pasquale, Lemke, Johannes R., Møller, Rikke S, Weckhuysen, Sarah, Stamberger, Hannah, Nikanorova, Marina, Willemsen, Marjolein H., Accorsi, Patrizia, Angriman, Marco, Baier, Hartmut, Benkel-Herrenbrueck, Ira, Benoit, Valérie, Budetta, Mauro, Caliebe, Almuth, Cantalupo, Gaetano, Capovilla, Giuseppe, Casara, Gianluca, Courage, Carolina, Deprez, Marie, Destrée, Anne, Dilena, Robertino, Erasmus, Corrie E., Fannemel, Madeleine, Fjær, Roar, Giordano, Lucio, Helbig, Katherine L, Heyne, Henrike O., Klepper, Joerg, Kluger, Gerhard J., Lederer, Damien, Lodi, Monica, Maier, Oliver, Merkenschlager, Andreas, Michelberger, Nina, Minetti, Carlo, Muhle, Hiltrud, Phalin, Judith, Ramsey, Keri, Romeo, Antonino, Schallner, Jens, Schanze, Ina, Shinawi, Marwan, Sleegers, Kristel, Sterbova, Katalin, Syrbe, Steffen, Traverso, Monica, Tzschach, Andreas, Uldall, Peter, Van Coster, Rudy, Verhelst, Helene, Viri, Maurizio, Winter, Susan, Wolff, Markus, Zenker, Martin, Zoccante, Leonardo, De Jonghe, Peter, Helbig, Ingo, Striano, Pasquale, Lemke, Johannes R., Møller, Rikke S, and Weckhuysen, Sarah

Abstract

Objective: To give a comprehensive overview of the phenotypic and genetic spectrum of STXBP1 encephalopathy (STXBP1-E) by systematically reviewing newly diagnosed and previously reported patients. Methods: We recruited newly diagnosed patients with STXBP1 mutations through an international network of clinicians and geneticists. Furthermore, we performed a systematic literature search to review the phenotypes of all previously reported patients. Results: We describe the phenotypic features of 147 patients with STXBP1-E including 45 previously unreported patients with 33 novel STXBP1 mutations. All patients have intellectual disability (ID), which is mostly severe to profound (88%). Ninety-five percent of patients have epilepsy. While one-third of patients presented with Ohtahara syndrome (21%) or West syndrome (9.5%), the majority has a nonsyndromic early-onset epilepsy and encephalopathy (53%) with epileptic spasms or tonic seizures as main seizure type. We found no correlation between severity of seizures and severity of ID or between mutation type and seizure characteristics or cognitive outcome. Neurologic comorbidities including autistic features and movement disorders are frequent. We also report 2 previously unreported adult patients with prominent extrapyramidal features. Conclusion: De novo STXBP1 mutations are among the most frequent causes of epilepsy and encephalopathy. Most patients have severe to profound ID with little correlation among seizure onset, seizure severity, and the degree of ID. Accordingly, we hypothesize that seizure severity and ID present 2 independent dimensions of the STXBP1-E phenotype. STXBP1-E may be conceptualized as a complex neurodevelopmental disorder rather than a primary epileptic encephalopathy.

Published
2016

26. STXBP1encephalopathy

Author

Stamberger, Hannah, primary, Nikanorova, Marina, additional, Willemsen, Marjolein H., additional, Accorsi, Patrizia, additional, Angriman, Marco, additional, Baier, Hartmut, additional, Benkel-Herrenbrueck, Ira, additional, Benoit, Valérie, additional, Budetta, Mauro, additional, Caliebe, Almuth, additional, Cantalupo, Gaetano, additional, Capovilla, Giuseppe, additional, Casara, Gianluca, additional, Courage, Carolina, additional, Deprez, Marie, additional, Destrée, Anne, additional, Dilena, Robertino, additional, Erasmus, Corrie E., additional, Fannemel, Madeleine, additional, Fjær, Roar, additional, Giordano, Lucio, additional, Helbig, Katherine L., additional, Heyne, Henrike O., additional, Klepper, Joerg, additional, Kluger, Gerhard J., additional, Lederer, Damien, additional, Lodi, Monica, additional, Maier, Oliver, additional, Merkenschlager, Andreas, additional, Michelberger, Nina, additional, Minetti, Carlo, additional, Muhle, Hiltrud, additional, Phalin, Judith, additional, Ramsey, Keri, additional, Romeo, Antonino, additional, Schallner, Jens, additional, Schanze, Ina, additional, Shinawi, Marwan, additional, Sleegers, Kristel, additional, Sterbova, Katalin, additional, Syrbe, Steffen, additional, Traverso, Monica, additional, Tzschach, Andreas, additional, Uldall, Peter, additional, Van Coster, Rudy, additional, Verhelst, Helene, additional, Viri, Maurizio, additional, Winter, Susan, additional, Wolff, Markus, additional, Zenker, Martin, additional, Zoccante, Leonardo, additional, De Jonghe, Peter, additional, Helbig, Ingo, additional, Striano, Pasquale, additional, Lemke, Johannes R., additional, Møller, Rikke S., additional, and Weckhuysen, Sarah, additional

Published
2016
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27. Further delineation of the KAT6B molecular and phenotypic spectrum

Author

UCL - SSS/IREC - Institut de recherche expérimentale et clinique, UCL - (SLuc) Centre de génétique médicale UCL, Gannon, Tamsin, Perveen, Rahat, Schlecht, Hélene, Ramsden, Simon, Anderson, Beverley, Kerr, Bronwyn, Day, Ruth, Banka, Siddharth, Suri, Mohnish, Berland, Siren, Gabbett, Michael, Ma, Alan, Lyonnet, Stan, Cormier-Daire, Valerie, Yilmaz, Rüstem, Borck, Guntram, Wieczorek, Dagmar, Anderlid, Britt-Marie, Smithson, Sarah, Vogt, Julie, Moore-Barton, Heather, Simsek-Kiper, Pelin Ozlem, Maystadt, Isabelle, Destrée, Anne, Bucher, Jessica, Angle, Brad, Mohammed, Shehla, Wakeling, Emma, Price, Sue, Singer, Amihood, Sznajer, Yves, Toutain, Annick, Haye, Damien, Newbury-Ecob, Ruth, Fradin, Melanie, McGaughran, Julie, Tuysuz, Beyhan, Tein, Mark, Bouman, Katelijne, Dabir, Tabib, Van den Ende, Jenneke, Luk, Ho Ming, Pilz, Daniela T, Eason, Jacqueline, Davies, Sally, Reardon, Willie, Garavelli, Livia, Zuffardi, Orsetta, Devriendt, Koen, Armstrong, Ruth, Johnson, Diana, Doco-Fenzy, Martine, Bijlsma, Emilia, Unger, Sheila, Veenstra-Knol, Hermine E, Kohlhase, Jürgen, Lo, Ivan F M, Smith, Janine, Clayton-Smith, Jill, UCL - SSS/IREC - Institut de recherche expérimentale et clinique, UCL - (SLuc) Centre de génétique médicale UCL, Gannon, Tamsin, Perveen, Rahat, Schlecht, Hélene, Ramsden, Simon, Anderson, Beverley, Kerr, Bronwyn, Day, Ruth, Banka, Siddharth, Suri, Mohnish, Berland, Siren, Gabbett, Michael, Ma, Alan, Lyonnet, Stan, Cormier-Daire, Valerie, Yilmaz, Rüstem, Borck, Guntram, Wieczorek, Dagmar, Anderlid, Britt-Marie, Smithson, Sarah, Vogt, Julie, Moore-Barton, Heather, Simsek-Kiper, Pelin Ozlem, Maystadt, Isabelle, Destrée, Anne, Bucher, Jessica, Angle, Brad, Mohammed, Shehla, Wakeling, Emma, Price, Sue, Singer, Amihood, Sznajer, Yves, Toutain, Annick, Haye, Damien, Newbury-Ecob, Ruth, Fradin, Melanie, McGaughran, Julie, Tuysuz, Beyhan, Tein, Mark, Bouman, Katelijne, Dabir, Tabib, Van den Ende, Jenneke, Luk, Ho Ming, Pilz, Daniela T, Eason, Jacqueline, Davies, Sally, Reardon, Willie, Garavelli, Livia, Zuffardi, Orsetta, Devriendt, Koen, Armstrong, Ruth, Johnson, Diana, Doco-Fenzy, Martine, Bijlsma, Emilia, Unger, Sheila, Veenstra-Knol, Hermine E, Kohlhase, Jürgen, Lo, Ivan F M, Smith, Janine, and Clayton-Smith, Jill

Abstract

KAT6B sequence variants have been identified previously in both patients with the Say-Barber-Biesecker type of blepharophimosis mental retardation syndromes (SBBS) and in the more severe genitopatellar syndrome (GPS). We report on the findings in a previously unreported group of 57 individuals with suggestive features of SBBS or GPS. Likely causative variants have been identified in 34/57 patients and were commonly located in the terminal exons of KAT6B. Of those where parental samples could be tested, all occurred de novo. Thirty out of thirty-four had truncating variants, one had a missense variant and the remaining three had the same synonymous change predicted to affect splicing. Variants in GPS tended to occur more proximally to those in SBBS patients, and genotype/phenotype analysis demonstrated significant clinical overlap between SBBS and GPS. The de novo synonymous change seen in three patients with features of SBBS occurred more proximally in exon 16. Statistical analysis of clinical features demonstrated that KAT6B variant-positive patients were more likely to display hypotonia, feeding difficulties, long thumbs/great toes and dental, thyroid and patella abnormalities than KAT6B variant-negative patients. The few reported patients with KAT6B haploinsufficiency had a much milder phenotype, though with some features overlapping those of SBBS. We report the findings in a previously unreported patient with a deletion of the KAT6B gene to further delineate the haploinsufficiency phenotype. The molecular mechanisms giving rise to the SBBS and GPS phenotypes are discussed.

Published
2015

28. Further delineation of the KAT6B molecular and phenotypic spectrum

Author

Gannon, Tamsin, Perveen, Rahat, Schlecht, Hélene, Ramsden, Simon, Anderson, Beverley, Kerr, Bronwyn, Day, Ruth, Banka, Siddharth, Suri, Mohnish, Berland, Siren, Gabbett, Michael, Ma, Alan, Lyonnet, Stan, Cormier-Daire, Valerie, Yilmaz, Rüstem, Borck, Guntram, Wieczorek, Dagmar, Anderlid, Britt Marie, Smithson, Sarah, Vogt, Julie, Moore-Barton, Heather, Simsek-Kiper, Pelin Ozlem, Maystadt, Isabelle, Destrée, Anne, Bucher, Jessica, Angle, Brad, Mohammed, Shehla, Wakeling, Emma, Price, Sue, Singer, Amihood, Sznajer, Yves, Toutain, Annick, Haye, Damien, Newbury-Ecob, Ruth, Fradin, Melanie, McGaughran, Julie, Tuysuz, Beyhan, Tein, Mark, Bouman, Katelijne, Dabir, Tabib, Van Den Ende, Jenneke, Luk, Ho Ming, Pilz, Daniela T., Eason, Jacqueline, Davies, Sally, Reardon, Willie, Garavelli, Livia, Zuffardi, Orsetta, Devriendt, Koen, Armstrong, Ruth, Johnson, Diana, Doco-Fenzy, Martine, Bijlsma, Emilia, Unger, Sheila, Veenstra-Knol, Hermine E., Kohlhase, Jürgen, Lo, Ivan F.M., Smith, Janine, Clayton-Smith, Jill, Gannon, Tamsin, Perveen, Rahat, Schlecht, Hélene, Ramsden, Simon, Anderson, Beverley, Kerr, Bronwyn, Day, Ruth, Banka, Siddharth, Suri, Mohnish, Berland, Siren, Gabbett, Michael, Ma, Alan, Lyonnet, Stan, Cormier-Daire, Valerie, Yilmaz, Rüstem, Borck, Guntram, Wieczorek, Dagmar, Anderlid, Britt Marie, Smithson, Sarah, Vogt, Julie, Moore-Barton, Heather, Simsek-Kiper, Pelin Ozlem, Maystadt, Isabelle, Destrée, Anne, Bucher, Jessica, Angle, Brad, Mohammed, Shehla, Wakeling, Emma, Price, Sue, Singer, Amihood, Sznajer, Yves, Toutain, Annick, Haye, Damien, Newbury-Ecob, Ruth, Fradin, Melanie, McGaughran, Julie, Tuysuz, Beyhan, Tein, Mark, Bouman, Katelijne, Dabir, Tabib, Van Den Ende, Jenneke, Luk, Ho Ming, Pilz, Daniela T., Eason, Jacqueline, Davies, Sally, Reardon, Willie, Garavelli, Livia, Zuffardi, Orsetta, Devriendt, Koen, Armstrong, Ruth, Johnson, Diana, Doco-Fenzy, Martine, Bijlsma, Emilia, Unger, Sheila, Veenstra-Knol, Hermine E., Kohlhase, Jürgen, Lo, Ivan F.M., Smith, Janine, and Clayton-Smith, Jill

Abstract

KAT6B sequence variants have been identified previously in both patients with the Say-Barber-Biesecker type of blepharophimosis mental retardation syndromes (SBBS) and in the more severe genitopatellar syndrome (GPS). We report on the findings in a previously unreported group of 57 individuals with suggestive features of SBBS or GPS. Likely causative variants have been identified in 34/57 patients and were commonly located in the terminal exons of KAT6B. Of those where parental samples could be tested, all occurred de novo. Thirty out of thirty-four had truncating variants, one had a missense variant and the remaining three had the same synonymous change predicted to affect splicing. Variants in GPS tended to occur more proximally to those in SBBS patients, and genotype/phenotype analysis demonstrated significant clinical overlap between SBBS and GPS. The de novo synonymous change seen in three patients with features of SBBS occurred more proximally in exon 16. Statistical analysis of clinical features demonstrated that KAT6B variant-positive patients were more likely to display hypotonia, feeding difficulties, long thumbs/great toes and dental, thyroid and patella abnormalities than KAT6B variant-negative patients. The few reported patients with KAT6B haploinsufficiency had a much milder phenotype, though with some features overlapping those of SBBS. We report the findings in a previously unreported patient with a deletion of the KAT6B gene to further delineate the haploinsufficiency phenotype. The molecular mechanisms giving rise to the SBBS and GPS phenotypes are discussed.

Published
2015

30. The SMAD-binding domain of SKI: a hotspot for de novo mutations causing Shprintzen–Goldberg syndrome

Author

Schepers, Dorien, primary, Doyle, Alexander J, additional, Oswald, Gretchen, additional, Sparks, Elizabeth, additional, Myers, Loretha, additional, Willems, Patrick J, additional, Mansour, Sahar, additional, Simpson, Michael A, additional, Frysira, Helena, additional, Maat-Kievit, Anneke, additional, Van Minkelen, Rick, additional, Hoogeboom, Jeanette M, additional, Mortier, Geert R, additional, Titheradge, Hannah, additional, Brueton, Louise, additional, Starr, Lois, additional, Stark, Zornitza, additional, Ockeloen, Charlotte, additional, Lourenco, Charles Marques, additional, Blair, Ed, additional, Hobson, Emma, additional, Hurst, Jane, additional, Maystadt, Isabelle, additional, Destrée, Anne, additional, Girisha, Katta M, additional, Miller, Michelle, additional, Dietz, Harry C, additional, Loeys, Bart, additional, and Van Laer, Lut, additional

Published
2014
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31. STXBP1 encephalopathy: A neurodevelopmental disorder including epilepsy.

Author

Stamberger, Hannah, Nikanorova, Marina, Willemsen, Marjolein H, Accorsi, Patrizia, Angriman, Marco, Baier, Hartmut, Benkel-Herrenbrueck, Ira, Benoit, Valérie, Budetta, Mauro, Caliebe, Almuth, Cantalupo, Gaetano, Capovilla, Giuseppe, Casara, Gianluca, Courage, Carolina, Deprez, Marie, Destrée, Anne, Dilena, Robertino, Erasmus, Corrie E, Fannemel, Madeleine, and Fjær, Roar

Published
2016
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32. Mutations in the TGF-β repressor SKI cause Shprintzen-Goldberg syndrome with aortic aneurysm

Author

Doyle, Alexander J, primary, Doyle, Jefferson J, additional, Bessling, Seneca L, additional, Maragh, Samantha, additional, Lindsay, Mark E, additional, Schepers, Dorien, additional, Gillis, Elisabeth, additional, Mortier, Geert, additional, Homfray, Tessa, additional, Sauls, Kimberly, additional, Norris, Russell A, additional, Huso, Nicholas D, additional, Leahy, Dan, additional, Mohr, David W, additional, Caulfield, Mark J, additional, Scott, Alan F, additional, Destrée, Anne, additional, Hennekam, Raoul C, additional, Arn, Pamela H, additional, Curry, Cynthia J, additional, Van Laer, Lut, additional, McCallion, Andrew S, additional, Loeys, Bart L, additional, and Dietz, Harry C, additional

Published
2012
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33. 14q12 and severe Rett-like phenotypes: new clinical insights and physical mapping of FOXG1-regulatory elements

Author

Allou, Lila, primary, Lambert, Laetitia, additional, Amsallem, Daniel, additional, Bieth, Eric, additional, Edery, Patrick, additional, Destrée, Anne, additional, Rivier, François, additional, Amor, David, additional, Thompson, Elizabeth, additional, Nicholl, Julian, additional, Harbord, Michael, additional, Nemos, Christophe, additional, Saunier, Aline, additional, Moustaïne, Aissa, additional, Vigouroux, Adeline, additional, Jonveaux, Philippe, additional, and Philippe, Christophe, additional

Published
2012
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34. Mutations at a single codon in Mad homology 2 domain of SMAD4 cause Myhre syndrome

Author

Le Goff, Carine, primary, Mahaut, Clémentine, additional, Abhyankar, Avinash, additional, Le Goff, Wilfried, additional, Serre, Valérie, additional, Afenjar, Alexandra, additional, Destrée, Anne, additional, di Rocco, Maja, additional, Héron, Delphine, additional, Jacquemont, Sébastien, additional, Marlin, Sandrine, additional, Simon, Marleen, additional, Tolmie, John, additional, Verloes, Alain, additional, Casanova, Jean-Laurent, additional, Munnich, Arnold, additional, and Cormier-Daire, Valérie, additional

Published
2011
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37. Mutations in the TGF-? repressor SKI cause Shprintzen-Goldberg syndrome with aortic aneurysm.

Author

Doyle, Alexander J, Doyle, Jefferson J, Bessling, Seneca L, Maragh, Samantha, Lindsay, Mark E, Schepers, Dorien, Gillis, Elisabeth, Mortier, Geert, Homfray, Tessa, Sauls, Kimberly, Norris, Russell A, Huso, Nicholas D, Leahy, Dan, Mohr, David W, Caulfield, Mark J, Scott, Alan F, Destrée, Anne, Hennekam, Raoul C, Arn, Pamela H, and Curry, Cynthia J

Subjects
GENETIC mutation, TRANSFORMING growth factors, VELOCARDIOFACIAL syndrome, AORTIC aneurysms, ONCOGENES, GENE silencing
Abstract

Elevated transforming growth factor (TGF)-? signaling has been implicated in the pathogenesis of syndromic presentations of aortic aneurysm, including Marfan syndrome (MFS) and Loeys-Dietz syndrome (LDS). However, the location and character of many of the causal mutations in LDS intuitively imply diminished TGF-? signaling. Taken together, these data have engendered controversy regarding the specific role of TGF-? in disease pathogenesis. Shprintzen-Goldberg syndrome (SGS) has considerable phenotypic overlap with MFS and LDS, including aortic aneurysm. We identified causative variation in ten individuals with SGS in the proto-oncogene SKI, a known repressor of TGF-? activity. Cultured dermal fibroblasts from affected individuals showed enhanced activation of TGF-? signaling cascades and higher expression of TGF-?-responsive genes relative to control cells. Morpholino-induced silencing of SKI paralogs in zebrafish recapitulated abnormalities seen in humans with SGS. These data support the conclusions that increased TGF-? signaling is the mechanism underlying SGS and that high signaling contributes to multiple syndromic presentations of aortic aneurysm. [ABSTRACT FROM AUTHOR]

Published
2012
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38. Mutations at a single codon in Mad homology 2 domain of SMAD4 cause Myhre syndrome.

Author

Le Goff, Carine, Mahaut, Clémentine, Abhyankar, Avinash, Le Goff, Wilfried, Serre, Valérie, Afenjar, Alexandra, Destrée, Anne, di Rocco, Maja, Héron, Delphine, Jacquemont, Sébastien, Marlin, Sandrine, Simon, Marleen, Tolmie, John, Verloes, Alain, Casanova, Jean-Laurent, Munnich, Arnold, and Cormier-Daire, Valérie

Subjects
HUMAN growth, HOMOLOGY (Biology), FACIAL abnormalities, HYPERTROPHY, DEAFNESS, TRANSFORMING growth factors
Abstract

Myhre syndrome (MIM 139210) is a developmental disorder characterized by short stature, short hands and feet, facial dysmorphism, muscular hypertrophy, deafness and cognitive delay. Using exome sequencing of individuals with Myhre syndrome, we identified SMAD4 as a candidate gene that contributes to this syndrome on the basis of its pivotal role in the bone morphogenetic pathway (BMP) and transforming growth factor (TGF)-? signaling. We identified three distinct heterozygous missense SMAD4 mutations affecting the codon for Ile500 in 11 individuals with Myhre syndrome. All three mutations are located in the region of SMAD4 encoding the Mad homology 2 (MH2) domain near the site of monoubiquitination at Lys519, and we found a defect in SMAD4 ubiquitination in fibroblasts from affected individuals. We also observed decreased expression of downstream TGF-? target genes, supporting the idea of impaired TGF-?-mediated transcriptional control in individuals with Myhre syndrome. [ABSTRACT FROM AUTHOR]

Published
2012
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39. Genotype-phenotype correlations in SCN8A-related disorders reveal prognostic and therapeutic implications.

Author

Johannesen KM, Liu Y, Koko M, Gjerulfsen CE, Sonnenberg L, Schubert J, Fenger CD, Eltokhi A, Rannap M, Koch NA, Lauxmann S, Krüger J, Kegele J, Canafoglia L, Franceschetti S, Mayer T, Rebstock J, Zacher P, Ruf S, Alber M, Sterbova K, Lassuthová P, Vlckova M, Lemke JR, Platzer K, Krey I, Heine C, Wieczorek D, Kroell-Seger J, Lund C, Klein KM, Au PYB, Rho JM, Ho AW, Masnada S, Veggiotti P, Giordano L, Accorsi P, Hoei-Hansen CE, Striano P, Zara F, Verhelst H, Verhoeven JS, Braakman HMH, van der Zwaag B, Harder AVE, Brilstra E, Pendziwiat M, Lebon S, Vaccarezza M, Le NM, Christensen J, Grønborg S, Scherer SW, Howe J, Fazeli W, Howell KB, Leventer R, Stutterd C, Walsh S, Gerard M, Gerard B, Matricardi S, Bonardi CM, Sartori S, Berger A, Hoffman-Zacharska D, Mastrangelo M, Darra F, Vøllo A, Motazacker MM, Lakeman P, Nizon M, Betzler C, Altuzarra C, Caume R, Roubertie A, Gélisse P, Marini C, Guerrini R, Bilan F, Tibussek D, Koch-Hogrebe M, Perry MS, Ichikawa S, Dadali E, Sharkov A, Mishina I, Abramov M, Kanivets I, Korostelev S, Kutsev S, Wain KE, Eisenhauer N, Wagner M, Savatt JM, Müller-Schlüter K, Bassan H, Borovikov A, Nassogne MC, Destrée A, Schoonjans AS, Meuwissen M, Buzatu M, Jansen A, Scalais E, Srivastava S, Tan WH, Olson HE, Loddenkemper T, Poduri A, Helbig KL, Helbig I, Fitzgerald MP, Goldberg EM, Roser T, Borggraefe I, Brünger T, May P, Lal D, Lederer D, Rubboli G, Heyne HO, Lesca G, Hedrich UBS, Benda J, Gardella E, Lerche H, and Møller RS

Subjects
Genetic Association Studies, Humans, Infant, Mutation, Prognosis, Seizures drug therapy, Seizures genetics, Sodium Channel Blockers therapeutic use, Epilepsy, Generalized drug therapy, Epilepsy, Generalized genetics, Epileptic Syndromes drug therapy, Epileptic Syndromes genetics, Intellectual Disability genetics, NAV1.6 Voltage-Gated Sodium Channel genetics
Abstract

We report detailed functional analyses and genotype-phenotype correlations in 392 individuals carrying disease-causing variants in SCN8A, encoding the voltage-gated Na+ channel Nav1.6, with the aim of describing clinical phenotypes related to functional effects. Six different clinical subgroups were identified: Group 1, benign familial infantile epilepsy (n = 15, normal cognition, treatable seizures); Group 2, intermediate epilepsy (n = 33, mild intellectual disability, partially pharmaco-responsive); Group 3, developmental and epileptic encephalopathy (n = 177, severe intellectual disability, majority pharmaco-resistant); Group 4, generalized epilepsy (n = 20, mild to moderate intellectual disability, frequently with absence seizures); Group 5, unclassifiable epilepsy (n = 127); and Group 6, neurodevelopmental disorder without epilepsy (n = 20, mild to moderate intellectual disability). Those in Groups 1-3 presented with focal or multifocal seizures (median age of onset: 4 months) and focal epileptiform discharges, whereas the onset of seizures in patients with generalized epilepsy was later (median: 42 months) with generalized epileptiform discharges. We performed functional studies expressing missense variants in ND7/23 neuroblastoma cells and primary neuronal cultures using recombinant tetrodotoxin-insensitive human Nav1.6 channels and whole-cell patch-clamping. Two variants causing developmental and epileptic encephalopathy showed a strong gain-of-function (hyperpolarizing shift of steady-state activation, strongly increased neuronal firing rate) and one variant causing benign familial infantile epilepsy or intermediate epilepsy showed a mild gain-of-function (defective fast inactivation, less increased firing). In contrast, all three variants causing generalized epilepsy induced a loss-of-function (reduced current amplitudes, depolarizing shift of steady-state activation, reduced neuronal firing). Functional effects were known for 170 individuals. All 136 individuals carrying a functionally tested gain-of-function variant had either focal (n = 97, Groups 1-3) or unclassifiable (n = 39) epilepsy, whereas 34 individuals with a loss-of-function variant had either generalized (n = 14), no (n = 11) or unclassifiable (n = 6) epilepsy; only three had developmental and epileptic encephalopathy. Computational modelling in the gain-of-function group revealed a significant correlation between the severity of the electrophysiological and clinical phenotypes. Gain-of-function variant carriers responded significantly better to sodium channel blockers than to other anti-seizure medications, and the same applied for all individuals in Groups 1-3. In conclusion, our data reveal clear genotype-phenotype correlations between age at seizure onset, type of epilepsy and gain- or loss-of-function effects of SCN8A variants. Generalized epilepsy with absence seizures is the main epilepsy phenotype of loss-of-function variant carriers and the extent of the electrophysiological dysfunction of the gain-of-function variants is a main determinant of the severity of the clinical phenotype in focal epilepsies. Our pharmacological data indicate that sodium channel blockers present a treatment option in SCN8A-related focal epilepsy with onset in the first year of life., (© The Author(s) (2021). Published by Oxford University Press on behalf of the Guarantors of Brain. All rights reserved. For permissions, please email: journals.permissions@oup.com.)

Published
2022
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40. Further delineation of the KAT6B molecular and phenotypic spectrum.

Author

Gannon T, Perveen R, Schlecht H, Ramsden S, Anderson B, Kerr B, Day R, Banka S, Suri M, Berland S, Gabbett M, Ma A, Lyonnet S, Cormier-Daire V, Yilmaz R, Borck G, Wieczorek D, Anderlid BM, Smithson S, Vogt J, Moore-Barton H, Simsek-Kiper PO, Maystadt I, Destrée A, Bucher J, Angle B, Mohammed S, Wakeling E, Price S, Singer A, Sznajer Y, Toutain A, Haye D, Newbury-Ecob R, Fradin M, McGaughran J, Tuysuz B, Tein M, Bouman K, Dabir T, Van den Ende J, Luk HM, Pilz DT, Eason J, Davies S, Reardon W, Garavelli L, Zuffardi O, Devriendt K, Armstrong R, Johnson D, Doco-Fenzy M, Bijlsma E, Unger S, Veenstra-Knol HE, Kohlhase J, Lo IF, Smith J, and Clayton-Smith J

Subjects
Blepharophimosis diagnosis, Blepharophimosis pathology, Child, Preschool, Congenital Hypothyroidism diagnosis, Congenital Hypothyroidism pathology, Craniofacial Abnormalities diagnosis, Craniofacial Abnormalities pathology, DNA Mutational Analysis, Diagnosis, Differential, Exome, Facies, Female, Gene Expression, Genetic Association Studies, Genotype, Heart Defects, Congenital diagnosis, Heart Defects, Congenital pathology, Humans, Intellectual Disability diagnosis, Intellectual Disability pathology, Joint Instability diagnosis, Joint Instability pathology, Kidney pathology, Male, Patella pathology, Phenotype, Psychomotor Disorders diagnosis, Psychomotor Disorders pathology, Scrotum pathology, Severity of Illness Index, Urogenital Abnormalities diagnosis, Urogenital Abnormalities pathology, Blepharophimosis genetics, Congenital Hypothyroidism genetics, Craniofacial Abnormalities genetics, Exons, Heart Defects, Congenital genetics, Histone Acetyltransferases genetics, Intellectual Disability genetics, Joint Instability genetics, Kidney abnormalities, Mutation, Patella abnormalities, Psychomotor Disorders genetics, Scrotum abnormalities, Urogenital Abnormalities genetics
Abstract

KAT6B sequence variants have been identified previously in both patients with the Say-Barber-Biesecker type of blepharophimosis mental retardation syndromes (SBBS) and in the more severe genitopatellar syndrome (GPS). We report on the findings in a previously unreported group of 57 individuals with suggestive features of SBBS or GPS. Likely causative variants have been identified in 34/57 patients and were commonly located in the terminal exons of KAT6B. Of those where parental samples could be tested, all occurred de novo. Thirty out of thirty-four had truncating variants, one had a missense variant and the remaining three had the same synonymous change predicted to affect splicing. Variants in GPS tended to occur more proximally to those in SBBS patients, and genotype/phenotype analysis demonstrated significant clinical overlap between SBBS and GPS. The de novo synonymous change seen in three patients with features of SBBS occurred more proximally in exon 16. Statistical analysis of clinical features demonstrated that KAT6B variant-positive patients were more likely to display hypotonia, feeding difficulties, long thumbs/great toes and dental, thyroid and patella abnormalities than KAT6B variant-negative patients. The few reported patients with KAT6B haploinsufficiency had a much milder phenotype, though with some features overlapping those of SBBS. We report the findings in a previously unreported patient with a deletion of the KAT6B gene to further delineate the haploinsufficiency phenotype. The molecular mechanisms giving rise to the SBBS and GPS phenotypes are discussed.

Published
2015
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41. The SMAD-binding domain of SKI: a hotspot for de novo mutations causing Shprintzen-Goldberg syndrome.

Author

Schepers D, Doyle AJ, Oswald G, Sparks E, Myers L, Willems PJ, Mansour S, Simpson MA, Frysira H, Maat-Kievit A, Van Minkelen R, Hoogeboom JM, Mortier GR, Titheradge H, Brueton L, Starr L, Stark Z, Ockeloen C, Lourenco CM, Blair E, Hobson E, Hurst J, Maystadt I, Destrée A, Girisha KM, Miller M, Dietz HC, Loeys B, and Van Laer L

Subjects
Adolescent, Adult, Arachnodactyly diagnosis, Binding Sites, Child, Child, Preschool, Craniosynostoses diagnosis, DNA-Binding Proteins chemistry, DNA-Binding Proteins metabolism, Exons, Female, Humans, Male, Marfan Syndrome diagnosis, Middle Aged, Protein Binding, Proto-Oncogene Proteins chemistry, Proto-Oncogene Proteins metabolism, Smad Proteins metabolism, Arachnodactyly genetics, Craniosynostoses genetics, DNA-Binding Proteins genetics, Marfan Syndrome genetics, Mutation, Missense, Proto-Oncogene Proteins genetics
Abstract

Shprintzen-Goldberg syndrome (SGS) is a rare, systemic connective tissue disorder characterized by craniofacial, skeletal, and cardiovascular manifestations that show a significant overlap with the features observed in the Marfan (MFS) and Loeys-Dietz syndrome (LDS). A distinguishing observation in SGS patients is the presence of intellectual disability, although not all patients in this series present this finding. Recently, SGS was shown to be due to mutations in the SKI gene, encoding the oncoprotein SKI, a repressor of TGFβ activity. Here, we report eight recurrent and three novel SKI mutations in eleven SGS patients. All were heterozygous missense mutations located in the R-SMAD binding domain, except for one novel in-frame deletion affecting the DHD domain. Adding our new findings to the existing data clearly reveals a mutational hotspot, with 73% (24 out of 33) of the hitherto described unrelated patients having mutations in a stretch of five SKI residues (from p.(Ser31) to p.(Pro35)). This implicates that the initial molecular testing could be focused on mutation analysis of the first half of exon 1 of SKI. As the majority of the known mutations are located in the R-SMAD binding domain of SKI, our study further emphasizes the importance of TGFβ signaling in the pathogenesis of SGS.

Published
2015
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42. Identification and characterization of a novel homozygous deletion in the alpha-N-acetylglucosaminidase gene in a patient with Sanfilippo type B syndrome (mucopolysaccharidosis IIIB).

Author

Champion KJ, Basehore MJ, Wood T, Destrée A, Vannuffel P, and Maystadt I

Subjects
Base Sequence, Child, Consanguinity, Female, Humans, Infant, Molecular Sequence Data, Mucopolysaccharidosis III enzymology, Pedigree, Sequence Deletion, Acetylglucosaminidase genetics, Mucopolysaccharidosis III genetics
Abstract

Sanfilippo syndrome type B (mucopolysaccharidosis IIIB) is an autosomal recessive disease that is caused by a deficiency of the lysosomal enzyme alpha-N-acetylglucosaminidase (NAGLU). Over 100 different mutations in the NAGLU gene have been identified in Sanfilippo syndrome type B patients; however, no large deletions have been reported. Here we present the first case of a large homozygous intragenic NAGLU gene deletion identified in an affected child of consanguineous parents. Long range and multiplex PCR methods were used to characterize this deletion which encompasses exons 3 and 4 and is 1146 base pairs long. We propose that Alu element-mediated unequal homologous recombination between an Alu-Y in intron 2 and an Alu-Sx in intron 4 is the likely mechanism for this deletion, thereby contributing further insight into the molecular etiology of this disorder and providing additional evidence of its allelic heterogeneity., ((c) 2010 Elsevier Inc. All rights reserved.)

Published
2010
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