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1. Mutations in ACTL6B Cause Neurodevelopmental Deficits and Epilepsy and Lead to Loss of Dendrites in Human Neurons.

Author

Bell, Scott, Rousseau, Justine, Peng, Huashan, Aouabed, Zahia, Priam, Pierre, Theroux, Jean-Francois, Jefri, Malvin, Tanti, Arnaud, Wu, Hanrong, Kolobova, Ilaria, Silviera, Heika, Manzano-Vargas, Karla, Ehresmann, Sophie, Hamdan, Fadi, Hettige, Nuwan, Zhang, Xin, Antonyan, Lilit, Nassif, Christina, Ghaloul-Gonzalez, Lina, Sebastian, Jessica, Vockley, Jerry, Begtrup, Amber, Wentzensen, Ingrid, Crunk, Amy, Nicholls, Robert, Deignan, Joshua, Al-Hertani, Walla, Efthymiou, Stephanie, Salpietro, Vincenzo, Miyake, Noriko, Makita, Yoshio, Matsumoto, Naomichi, Østern, Rune, Houge, Gunnar, Hafström, Maria, Fassi, Emily, Houlden, Henry, Klein Wassink-Ruiter, Jolien, Nelson, Dominic, Goldstein, Amy, Dabir, Tabib, van Gils, Julien, Bourgeron, Thomas, Delorme, Richard, Cooper, Gregory, Martinez, Jose, Finnila, Candice, Carmant, Lionel, Lortie, Anne, Oegema, Renske, van Gassen, Koen, Mehta, Sarju, Huhle, Dagmar, Abou Jamra, Rami, Martin, Sonja, Brunner, Han, Lindhout, Dick, Au, Margaret, Graham, John, Coubes, Christine, Turecki, Gustavo, Gravel, Simon, Mechawar, Naguib, Rossignol, Elsa, Michaud, Jacques, Lessard, Julie, Ernst, Carl, Campeau, Philippe, and Herman, Kristin

Subjects
ACTL6B, genetic engineering, intellectual disability, neurodevelopment, seizure, stem cells, Actins, Adult, Child, Child, Preschool, Chromatin, Chromosomal Proteins, Non-Histone, DNA-Binding Proteins, Dendrites, Epilepsy, Female, Humans, Induced Pluripotent Stem Cells, Infant, Male, Mutation, Neurodevelopmental Disorders, Neurons, Young Adult
Abstract

We identified individuals with variations in ACTL6B, a component of the chromatin remodeling machinery including the BAF complex. Ten individuals harbored bi-allelic mutations and presented with global developmental delay, epileptic encephalopathy, and spasticity, and ten individuals with de novo heterozygous mutations displayed intellectual disability, ambulation deficits, severe language impairment, hypotonia, Rett-like stereotypies, and minor facial dysmorphisms (wide mouth, diastema, bulbous nose). Nine of these ten unrelated individuals had the identical de novo c.1027G>A (p.Gly343Arg) mutation. Human-derived neurons were generated that recaptured ACTL6B expression patterns in development from progenitor cell to post-mitotic neuron, validating the use of this model. Engineered knock-out of ACTL6B in wild-type human neurons resulted in profound deficits in dendrite development, a result recapitulated in two individuals with different bi-allelic mutations, and reversed on clonal genetic repair or exogenous expression of ACTL6B. Whole-transcriptome analyses and whole-genomic profiling of the BAF complex in wild-type and bi-allelic mutant ACTL6B neural progenitor cells and neurons revealed increased genomic binding of the BAF complex in ACTL6B mutants, with corresponding transcriptional changes in several genes including TPPP and FSCN1, suggesting that altered regulation of some cytoskeletal genes contribute to altered dendrite development. Assessment of bi-alleic and heterozygous ACTL6B mutations on an ACTL6B knock-out human background demonstrated that bi-allelic mutations mimic engineered deletion deficits while heterozygous mutations do not, suggesting that the former are loss of function and the latter are gain of function. These results reveal a role for ACTL6B in neurodevelopment and implicate another component of chromatin remodeling machinery in brain disease.

Published
2019

3. High Rate of Recurrent De Novo Mutations in Developmental and Epileptic Encephalopathies

Author

Hamdan, Fadi F., Myers, Candace T., Cossette, Patrick, Lemay, Philippe, Spiegelman, Dan, Laporte, Alexandre Dionne, Nassif, Christina, Diallo, Ousmane, Monlong, Jean, Cadieux-Dion, Maxime, Dobrzeniecka, Sylvia, Meloche, Caroline, Retterer, Kyle, Cho, Megan T., Rosenfeld, Jill A., Bi, Weimin, Massicotte, Christine, Miguet, Marguerite, Brunga, Ledia, Regan, Brigid M., Mo, Kelly, Tam, Cory, Schneider, Amy, Hollingsworth, Georgie, FitzPatrick, David R., Donaldson, Alan, Canham, Natalie, Blair, Edward, Kerr, Bronwyn, Fry, Andrew E., Thomas, Rhys H., Shelagh, Joss, Hurst, Jane A., Brittain, Helen, Blyth, Moira, Lebel, Robert Roger, Gerkes, Erica H., Davis-Keppen, Laura, Stein, Quinn, Chung, Wendy K., Dorison, Sara J., Benke, Paul J., Fassi, Emily, Corsten-Janssen, Nicole, Kamsteeg, Erik-Jan, Mau-Them, Frederic T., Bruel, Ange-Line, Verloes, Alain, Õunap, Katrin, Wojcik, Monica H., Albert, Dara V.F., Venkateswaran, Sunita, Ware, Tyson, Jones, Dean, Liu, Yu-Chi, Mohammad, Shekeeb S., Bizargity, Peyman, Bacino, Carlos A., Leuzzi, Vincenzo, Martinelli, Simone, Dallapiccola, Bruno, Tartaglia, Marco, Blumkin, Lubov, Wierenga, Klaas J., Purcarin, Gabriela, O’Byrne, James J., Stockler, Sylvia, Lehman, Anna, Keren, Boris, Nougues, Marie-Christine, Mignot, Cyril, Auvin, Stéphane, Nava, Caroline, Hiatt, Susan M., Bebin, Martina, Shao, Yunru, Scaglia, Fernando, Lalani, Seema R., Frye, Richard E., Jarjour, Imad T., Jacques, Stéphanie, Boucher, Renee-Myriam, Riou, Emilie, Srour, Myriam, Carmant, Lionel, Lortie, Anne, Major, Philippe, Diadori, Paola, Dubeau, François, D’Anjou, Guy, Bourque, Guillaume, Berkovic, Samuel F., Sadleir, Lynette G., Campeau, Philippe M., Kibar, Zoha, Lafrenière, Ronald G., Girard, Simon L., Mercimek-Mahmutoglu, Saadet, Boelman, Cyrus, Rouleau, Guy A., Scheffer, Ingrid E., Mefford, Heather C., Andrade, Danielle M., Rossignol, Elsa, Minassian, Berge A., and Michaud, Jacques L.

Published
2017
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4. Brain language networks and cognitive outcomes in children with frontotemporal lobe epilepsy.

Author

Hüsser, Alejandra M., Vannasing, Phetsamone, Tremblay, Julie, Osterman, Bradley, Lortie, Anne, Diadori, Paola, Major, Philippe, Rossignol, Elsa, Roger, Kassandra, Fourdain, Solène, Provost, Sarah, Maalouf, Yara, Dang Khoa Nguyen, and Gallagher, Anne

Subjects
LARGE-scale brain networks, CEREBRAL dominance, FRONTAL lobe, TEMPORAL lobe epilepsy, EPILEPSY, NEAR infrared spectroscopy, NEUROPSYCHOLOGICAL tests, NEUROLINGUISTICS, NEUROPSYCHOLOGY
Abstract

Introduction: Pediatric frontal and temporal lobe epilepsies (FLE, TLE) have been associated with language impairments and structural and functional brain alterations. However, there is no clear consensus regarding the specific patterns of cerebral reorganization of language networks in these patients. The current study aims at characterizing the cerebral language networks in children with FLE or TLE, and the association between brain network characteristics and cognitive abilities. Methods: Twenty (20) children with FLE or TLE aged between 6 and 18 years and 29 age- and sex-matched healthy controls underwent a neuropsychological evaluation and a simultaneous functional near-infrared spectroscopy and electroencephalography (fNIRS-EEG) recording at rest and during a receptive language task. EEG was used to identify potential subclinical seizures in patients. We removed these time intervals from the fNIRS signal to investigate language brain networks and not epileptogenic networks. Functional connectivity matrices on fNIRS oxy-hemoglobin concentration changes were computed using cross-correlations between all channels. Results and discussion: Group comparisons of residual matrices (=individual task-based matrix minus individual resting-state matrix) revealed significantly reduced connectivity within the left and between hemispheres, increased connectivity within the right hemisphere and higher right hemispheric local efficiency for the epilepsy group compared to the control group. The epilepsy group had significantly lower cognitive performance in all domains compared to their healthy peers. Epilepsy patients' local network efficiency in the left hemisphere was negatively associated with the estimated IQ (p = 0.014), suggesting that brain reorganization in response to FLE and TLE does not allow for an optimal cognitive development. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Pharmacogenetic testing in pediatric neurology: a pragmatic study evaluating clinician and patient perceptions

Author

Pépin, Marie-Anne, primary, Otis, Anne-Sophie, additional, Tremblay, Zoë, additional, Boulé, Marianne, additional, Lebel, Denis, additional, Major, Philippe, additional, Lortie, Anne, additional, Pinchefsky, Elana, additional, Rossignol, Elsa, additional, Carleton, Bruce, additional, Bussières, Jean-François, additional, and Métras, Marie-Élaine, additional

Published
2022
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8. The genetic landscape of infantile spasms

Author

Michaud, Jacques L., Lachance, Mathieu, Hamdan, Fadi F., Carmant, Lionel, Lortie, Anne, Diadori, Paola, Major, Philippe, Meijer, Inge A., Lemyre, Emmanuelle, Cossette, Patrick, Mefford, Heather C., Rouleau, Guy A., and Rossignol, Elsa

Published
2014
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15. Mutations in ACTL6B Cause Neurodevelopmental Deficits and Epilepsy and Lead to Loss of Dendrites in Human Neurons

Author

Genetica, Genetica Klinische Genetica, Brain, Child Health, Genetica Sectie Genoomdiagnostiek, CMM Sectie Genomics and Bioinformatics, Bell, Scott, Rousseau, Justine, Peng, Huashan, Aouabed, Zahia, Priam, Pierre, Theroux, Jean Francois, Jefri, Malvin, Tanti, Arnaud, Wu, Hanrong, Kolobova, Ilaria, Silviera, Heika, Manzano-Vargas, Karla, Ehresmann, Sophie, Hamdan, Fadi F., Hettige, Nuwan, Zhang, Xin, Antonyan, Lilit, Nassif, Christina, Ghaloul-Gonzalez, Lina, Sebastian, Jessica, Vockley, Jerry, Begtrup, Amber G., Wentzensen, Ingrid M., Crunk, Amy, Nicholls, Robert D., Herman, Kristin C., Deignan, Joshua L., Al-Hertani, Walla, Efthymiou, Stephanie, Salpietro, Vincenzo, Miyake, Noriko, Makita, Yoshio, Matsumoto, Naomichi, Østern, Rune, Houge, Gunnar, Hafström, Maria, Fassi, Emily, Houlden, Henry, Klein Wassink-Ruiter, Jolien S., Nelson, Dominic, Goldstein, Amy, Dabir, Tabib, van Gils, Julien, Bourgeron, Thomas, Delorme, Richard, Cooper, Gregory M., Martinez, Jose E., Finnila, Candice R., Carmant, Lionel, Lortie, Anne, Oegema, Renske, van Gassen, Koen, Mehta, Sarju G., Huhle, Dagmar, Abou Jamra, Rami, Martin, Sonja, Brunner, Han G., Lindhout, Dick, Au, Margaret, Graham, John M., Coubes, Christine, Turecki, Gustavo, Gravel, Simon, Mechawar, Naguib, Rossignol, Elsa, Michaud, Jacques L., Lessard, Julie, Ernst, Carl, Campeau, Philippe M., Genetica, Genetica Klinische Genetica, Brain, Child Health, Genetica Sectie Genoomdiagnostiek, CMM Sectie Genomics and Bioinformatics, Bell, Scott, Rousseau, Justine, Peng, Huashan, Aouabed, Zahia, Priam, Pierre, Theroux, Jean Francois, Jefri, Malvin, Tanti, Arnaud, Wu, Hanrong, Kolobova, Ilaria, Silviera, Heika, Manzano-Vargas, Karla, Ehresmann, Sophie, Hamdan, Fadi F., Hettige, Nuwan, Zhang, Xin, Antonyan, Lilit, Nassif, Christina, Ghaloul-Gonzalez, Lina, Sebastian, Jessica, Vockley, Jerry, Begtrup, Amber G., Wentzensen, Ingrid M., Crunk, Amy, Nicholls, Robert D., Herman, Kristin C., Deignan, Joshua L., Al-Hertani, Walla, Efthymiou, Stephanie, Salpietro, Vincenzo, Miyake, Noriko, Makita, Yoshio, Matsumoto, Naomichi, Østern, Rune, Houge, Gunnar, Hafström, Maria, Fassi, Emily, Houlden, Henry, Klein Wassink-Ruiter, Jolien S., Nelson, Dominic, Goldstein, Amy, Dabir, Tabib, van Gils, Julien, Bourgeron, Thomas, Delorme, Richard, Cooper, Gregory M., Martinez, Jose E., Finnila, Candice R., Carmant, Lionel, Lortie, Anne, Oegema, Renske, van Gassen, Koen, Mehta, Sarju G., Huhle, Dagmar, Abou Jamra, Rami, Martin, Sonja, Brunner, Han G., Lindhout, Dick, Au, Margaret, Graham, John M., Coubes, Christine, Turecki, Gustavo, Gravel, Simon, Mechawar, Naguib, Rossignol, Elsa, Michaud, Jacques L., Lessard, Julie, Ernst, Carl, and Campeau, Philippe M.

Published
2019

16. VALIDITY OF PARENT-COMPLETED DEVELOPMENTAL SCREENING IN CHILDREN WITH NEW-ONSET EPILEPSY BELOW THE AGE OF 3

Author

Barton, Madelyn, primary, Simard, Marie-Noëlle, additional, Reiter-Campeau, Sandra, additional, Lupien, Genevieve, additional, Lamothe, Marie-Pierre, additional, Chartrand, Dominic, additional, Saint-Louis, Marie-Eve, additional, Lortie, Anne, additional, Major, Philippe, additional, Diadori, Paola, additional, Birca, Ala, additional, Rossignol, Elsa, additional, and Carmant, Lionel, additional

Published
2018
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17. Rare coding variants in genes encoding GABAA receptors in genetic generalised epilepsies: an exome-based case-control study

Author

Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], Luxembourg Centre for Systems Biomedicine (LCSB): Experimental Neurobiology (Balling Group) [research center], University of Luxembourg: High Performance Computing - ULHPC [research center], May, Patrick, Girard, Simon, Harrer, Merle, Bobbili, Dheeraj Reddy, Schubert, Julian, Wolking, Stefan, Becker, Felicitas, Lachance-Touchette, Pamela, Meloche, Caroline, Gravel, Micheline, Niturad, Christina E., Knaus, Julia, De Kovel, Carolien, Toliat, Mohamad, Polvi, Anne, Iacomino, Michele, Guerrero-López, Rosa, Baulac, Stéphanie, Marini, Carla, Thiele, Holger, Altmüller, Janine, Jabbari, Kamel, Ruppert, Ann-Kathrin, Jurkowski, Wiktor, Lal, Dennis, Rusconi, Raffaella, Cestèle, Sandrine, Terragni, Benedetta, Coombs, Ian D., Reid, Christopher A., Striano, Pasquale, Caglayan, Hande, Siren, Auli, Everett, Kate, Møller, Rikke S., Hjalgrim, Hille, Muhle, Hiltrud, Helbig, Ingo, Kunz, Wolfram S., Weber, Yvonne G., De Jonghe, Peter, Sisodiya, Sanjay M., Nabbout, Rima, Franceschetti, Silvana, Coppola, Antonietta, Vari, Maria S., Kasteleijn-Nolst Trenité, Dorothée, Baykan, Betul, Ozbek, Ugur, Bebek, Nerses, Klein, Karl M., Rosenow, Felix, Nguyen, Dang K., Dubeau, Francis, Carmant, Lionel, Lortie, Anne, Desbiens, Richard, Clément, Jean-François, Cieuta-Walti, Sills, Graeme J., Auce, Pauls, Francin, Ben, Johnson, Michael R., Berghuis, Bianca, Sander, Josemir W., Avbersek, Andreja, McCormack, Mark, Cavalleri, Gianpiero L., Delanty, Norman, Depondt, Chantal, Krenn, Martin, Zimprich, Fritz, Peter, Sarah, Nikanorova, Marina, Kraaij, Robert, van Rooij, Jeroen, Balling, Rudi, Ikram, M. Arfan, Uitterlinden, André G., Avanzini, Giuliano, Schorge, Stephanie, Petrou, Steven, Mantegazza, Massimo, Sander, Thomas, LeGuern, Eric, Serratosa Jose M., Koeleman, Bobby P.C., Palotie, Aarno, Lehesjoki, Anna-Elina, Nothnagel, Michael, Nürnberg, Peter, Maljevic, Snezana, Zara, Federico, Cossette, Patrick, Krause, Roland, Lerche, Holger, Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], Luxembourg Centre for Systems Biomedicine (LCSB): Experimental Neurobiology (Balling Group) [research center], University of Luxembourg: High Performance Computing - ULHPC [research center], May, Patrick, Girard, Simon, Harrer, Merle, Bobbili, Dheeraj Reddy, Schubert, Julian, Wolking, Stefan, Becker, Felicitas, Lachance-Touchette, Pamela, Meloche, Caroline, Gravel, Micheline, Niturad, Christina E., Knaus, Julia, De Kovel, Carolien, Toliat, Mohamad, Polvi, Anne, Iacomino, Michele, Guerrero-López, Rosa, Baulac, Stéphanie, Marini, Carla, Thiele, Holger, Altmüller, Janine, Jabbari, Kamel, Ruppert, Ann-Kathrin, Jurkowski, Wiktor, Lal, Dennis, Rusconi, Raffaella, Cestèle, Sandrine, Terragni, Benedetta, Coombs, Ian D., Reid, Christopher A., Striano, Pasquale, Caglayan, Hande, Siren, Auli, Everett, Kate, Møller, Rikke S., Hjalgrim, Hille, Muhle, Hiltrud, Helbig, Ingo, Kunz, Wolfram S., Weber, Yvonne G., De Jonghe, Peter, Sisodiya, Sanjay M., Nabbout, Rima, Franceschetti, Silvana, Coppola, Antonietta, Vari, Maria S., Kasteleijn-Nolst Trenité, Dorothée, Baykan, Betul, Ozbek, Ugur, Bebek, Nerses, Klein, Karl M., Rosenow, Felix, Nguyen, Dang K., Dubeau, Francis, Carmant, Lionel, Lortie, Anne, Desbiens, Richard, Clément, Jean-François, Cieuta-Walti, Sills, Graeme J., Auce, Pauls, Francin, Ben, Johnson, Michael R., Berghuis, Bianca, Sander, Josemir W., Avbersek, Andreja, McCormack, Mark, Cavalleri, Gianpiero L., Delanty, Norman, Depondt, Chantal, Krenn, Martin, Zimprich, Fritz, Peter, Sarah, Nikanorova, Marina, Kraaij, Robert, van Rooij, Jeroen, Balling, Rudi, Ikram, M. Arfan, Uitterlinden, André G., Avanzini, Giuliano, Schorge, Stephanie, Petrou, Steven, Mantegazza, Massimo, Sander, Thomas, LeGuern, Eric, Serratosa Jose M., Koeleman, Bobby P.C., Palotie, Aarno, Lehesjoki, Anna-Elina, Nothnagel, Michael, Nürnberg, Peter, Maljevic, Snezana, Zara, Federico, Cossette, Patrick, Krause, Roland, and Lerche, Holger

Abstract

Background Genetic generalised epilepsy is the most common type of inherited epilepsy. Despite a high concordance rate of 80% in monozygotic twins, the genetic background is still poorly understood. We aimed to investigate the burden of rare genetic variants in genetic generalised epilepsy. Methods For this exome-based case-control study, we used three different genetic generalised epilepsy case cohorts and three independent control cohorts, all of European descent. Cases included in the study were clinically evaluated for genetic generalised epilepsy. Whole-exome sequencing was done for the discovery case cohort, a validation case cohort, and two independent control cohorts. The replication case cohort underwent targeted next-generation sequencing of the 19 known genes encoding subunits of GABAA receptors and was compared to the respective GABAA receptor variants of a third independent control cohort. Functional investigations were done with automated two-microelectrode voltage clamping in Xenopus laevis oocytes. Findings Statistical comparison of 152 familial index cases with genetic generalised epilepsy in the discovery cohort to 549 ethnically matched controls suggested an enrichment of rare missense (Nonsyn) variants in the ensemble of 19 genes encoding GABAA receptors in cases (odds ratio [OR] 2·40 [95% CI 1·41–4·10]; pNonsyn=0·0014, adjusted pNonsyn=0·019). Enrichment for these genes was validated in a whole-exome sequencing cohort of 357 sporadic and familial genetic generalised epilepsy cases and 1485 independent controls (OR 1·46 [95% CI 1·05–2·03]; pNonsyn=0·0081, adjusted pNonsyn=0·016). Comparison of genes encoding GABAA receptors in the independent replication cohort of 583 familial and sporadic genetic generalised epilepsy index cases, based on candidate-gene panel sequencing, with a third independent control cohort of 635 controls confirmed the overall enrichment of rare missense variants for 15 GABAA receptor genes in cases compared with controls (O

Published
2018

18. Rare coding variants in genes encoding GABA(A) receptors in genetic generalised epilepsies: an exome-based case-control study

Author

May, Patrick, Girard, Simon, Harrer, Merle, Bobbili, Dheeraj R., Schubert, Julian, Wolking, Stefan, Becker, Felicitas, Lachance-Touchette, Pamela, Meloche, Caroline, Gravel, Micheline, Niturad, Cristina E., Knaus, Julia, De Kovel, Carolien, Toliat, Mohamad, Polvi, Anne, Iacomino, Michele, Guerrero-Lopez, Rosa, Baulac, Stephanie, Marini, Carla, Thiele, Holger, Altmueller, Janine, Jabbari, Kamel, Ruppert, Ann-Kathrin, Jurkowski, Wiktor, Lal, Dennis, Rusconi, Raffaella, Cestele, Sandrine, Terragni, Benedetta, Coombs, Ian D., Reid, Christopher A., Striano, Pasquale, Caglayan, Hande, Siren, Auli, Everett, Kate, Moller, Rikke S., Hjalgrim, Helle, Muhle, Hiltrud, Helbig, Ingo, Kunz, Wolfram S., Weber, Yvonne G., Weckhuysen, Sarah, De Jonghe, Peter, Sisodiya, Sanjay M., Nabbout, Rima, Franceschetti, Silvana, Coppola, Antonietta, Vari, Maria S., Trenite, Dorothee Kasteleijn-Nolst, Baykan, Betul, Ozbek, Ugur, Bebek, Nerses, Klein, Karl M., Rosenow, Felix, Nguyen, Dang K., Dubeau, Francois, Carmant, Lionel, Lortie, Anne, Desbiens, Richard, Clement, Jean-Francois, Cieuta-Walti, Cecile, Sills, Graeme J., Auce, Pauls, Francis, Ben, Johnson, Michael R., Marson, Anthony G., Berghuis, Bianca, Sander, Josemir W., Avbersek, Andreja, McCormack, Mark, Cavalleri, Gianpiero L., Delanty, Norman, Depondt, Chantal, Krenn, Martin, Zimprich, Fritz, Peter, Sarah, Nikanorova, Marina, Kraaij, Robert, van Rooij, Jeroen, Balling, Rudi, Ikram, M. Arfan, Uitterlinden, Andre G., Avanzini, Giuliano, Schorge, Stephanie, Petrou, Steven, Mantegazza, Massimo, Sander, Thomas, LeGuern, Eric, Serratosa, Jose M., Koeleman, Bobby P. C., Palotie, Aarno, Lehesjoki, Anna-Elina, Nothnagel, Michael, Nuernberg, Peter, Maljevic, Snezana, Zara, Federico, Cossette, Patrick, Krause, Roland, Lerche, Holger, May, Patrick, Girard, Simon, Harrer, Merle, Bobbili, Dheeraj R., Schubert, Julian, Wolking, Stefan, Becker, Felicitas, Lachance-Touchette, Pamela, Meloche, Caroline, Gravel, Micheline, Niturad, Cristina E., Knaus, Julia, De Kovel, Carolien, Toliat, Mohamad, Polvi, Anne, Iacomino, Michele, Guerrero-Lopez, Rosa, Baulac, Stephanie, Marini, Carla, Thiele, Holger, Altmueller, Janine, Jabbari, Kamel, Ruppert, Ann-Kathrin, Jurkowski, Wiktor, Lal, Dennis, Rusconi, Raffaella, Cestele, Sandrine, Terragni, Benedetta, Coombs, Ian D., Reid, Christopher A., Striano, Pasquale, Caglayan, Hande, Siren, Auli, Everett, Kate, Moller, Rikke S., Hjalgrim, Helle, Muhle, Hiltrud, Helbig, Ingo, Kunz, Wolfram S., Weber, Yvonne G., Weckhuysen, Sarah, De Jonghe, Peter, Sisodiya, Sanjay M., Nabbout, Rima, Franceschetti, Silvana, Coppola, Antonietta, Vari, Maria S., Trenite, Dorothee Kasteleijn-Nolst, Baykan, Betul, Ozbek, Ugur, Bebek, Nerses, Klein, Karl M., Rosenow, Felix, Nguyen, Dang K., Dubeau, Francois, Carmant, Lionel, Lortie, Anne, Desbiens, Richard, Clement, Jean-Francois, Cieuta-Walti, Cecile, Sills, Graeme J., Auce, Pauls, Francis, Ben, Johnson, Michael R., Marson, Anthony G., Berghuis, Bianca, Sander, Josemir W., Avbersek, Andreja, McCormack, Mark, Cavalleri, Gianpiero L., Delanty, Norman, Depondt, Chantal, Krenn, Martin, Zimprich, Fritz, Peter, Sarah, Nikanorova, Marina, Kraaij, Robert, van Rooij, Jeroen, Balling, Rudi, Ikram, M. Arfan, Uitterlinden, Andre G., Avanzini, Giuliano, Schorge, Stephanie, Petrou, Steven, Mantegazza, Massimo, Sander, Thomas, LeGuern, Eric, Serratosa, Jose M., Koeleman, Bobby P. C., Palotie, Aarno, Lehesjoki, Anna-Elina, Nothnagel, Michael, Nuernberg, Peter, Maljevic, Snezana, Zara, Federico, Cossette, Patrick, Krause, Roland, and Lerche, Holger

Abstract

Background Genetic generalised epilepsy is the most common type of inherited epilepsy. Despite a high concordance rate of 80% in monozygotic twins, the genetic background is still poorly understood. We aimed to investigate the burden of rare genetic variants in genetic generalised epilepsy. Methods For this exome-based case-control study, we used three different genetic generalised epilepsy case cohorts and three independent control cohorts, all of European descent. Cases included in the study were clinically evaluated for genetic generalised epilepsy. Whole-exome sequencing was done for the discovery case cohort, a validation case cohort, and two independent control cohorts. The replication case cohort underwent targeted next-generation sequencing of the 19 known genes encoding subunits of GABA(A) receptors and was compared to the respective GABA(A) receptor variants of a third independent control cohort. Functional investigations were done with automated two-microelectrode voltage clamping in Xenopus laevis oocytes. Findings Statistical comparison of 152 familial index cases with genetic generalised epilepsy in the discovery cohort to 549 ethnically matched controls suggested an enrichment of rare missense (Nonsyn) variants in the ensemble of 19 genes encoding GABA(A) receptors in cases (odds ratio [OR] 2.40 [95% CI 1.41-4.10]; p(Nonsyn)=0.0014, adjusted p(Nonsyn)=0.019). Enrichment for these genes was validated in a whole-exome sequencing cohort of 357 sporadic and familial genetic generalised epilepsy cases and 1485 independent controls (OR 1.46 [95% CI 1.05-2.03]; p(Nonsyn)=0.0081, adjusted p(Nonsyn)=0.016). Comparison of genes encoding GABA(A) receptors in the independent replication cohort of 583 familial and sporadic genetic generalised epilepsy index cases, based on candidate-gene panel sequencing, with a third independent control cohort of 635 controls confirmed the overall enrichment of rare missense variants for 15 GABA(A) receptor genes in cases compare

Published
2018

20. Mutations in DOCK7 in Individuals with Epileptic Encephalopathy and Cortical Blindness

Author

Perrault, Isabelle, Hamdan, Fadi F., Rio, Marlène, Capo-Chichi, José-Mario, Boddaert, Nathalie, Décarie, Jean-Claude, Maranda, Bruno, Nabbout, Rima, Sylvain, Michel, Lortie, Anne, Roux, Philippe P., Rossignol, Elsa, Gérard, Xavier, Barcia, Giulia, Berquin, Patrick, Munnich, Arnold, Rouleau, Guy A., Kaplan, Josseline, Rozet, Jean-Michel, and Michaud, Jacques L.

Published
2014
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23. Association of ultra-rare coding variants with genetic generalized epilepsy: A case–control whole exome sequencing study

Author

Koko, M., Motelow, J. E., Stanley, K. E., Bobbili, D. R., Dhindsa, R. S., May, P., Alldredge, B. K., Allen, A. S., Altmuller, J., Amrom, D., Andermann, E., Auce, P., Avbersek, A., Baulac, S., Bautista, J. F., Becker, F., Bellows, S. T., Berghuis, B., Berkovic, S. F., Bluvstein, J., Boro, A., Bridgers, J., Burgess, R., Caglayan, H., Cascino, G. D., Cavalleri, G. L., Chung, S. -K., Cieuta-Walti, C., Cloutier, V., Consalvo, D., Cossette, P., Crumrine, P., Delanty, N., Depondt, C., Desbiens, R., Devinsky, O., Dlugos, D., Epstein, M. P., Everett, K., Fiol, M., Fountain, N. B., Francis, B., French, J., Freyer, C., Friedman, D., Gambardella, A., Geller, E. B., Girard, S., Glauser, T., Glynn, S., Goldstein, D. B., Gravel, M., Haas, K., Haut, S. R., Heinzen, E. L., Helbig, I., Hildebrand, M. S., Johnson, M. R., Jorgensen, A., Joshi, S., Kanner, A., Kirsch, H. E., Klein, K. M., Knowlton, R. C., Koeleman, B. P. C., Kossoff, E. H., Krause, R., Krenn, M., Kunz, W. S., Kuzniecky, R., Langley, S. R., Leguern, E., Lehesjoki, A. -E., Lerche, H., Leu, C., Lortie, A., Lowenstein, D. H., Marson, A. G., Mebane, C., Mefford, H. C., Meloche, C., Moreau, C., Motika, P. V., Muhle, H., Moller, R. S., Nabbout, R., Nguyen, D. K., Nikanorova, M., Novotny, E. J., Nurnberg, P., Ottman, R., O'Brien, T. J., Paolicchi, J. M., Parent, J. M., Park, K., Peter, S., Petrou, S., Petrovski, S., Pickrell, W. O., Poduri, A., Radtke, R. A., Rees, M. I., Regan, B. M., Ren, Z., Sadleir, L. G., Sander, J. W., Sander, T., Scheffer, I. E., Schubert, J., Shellhaas, R. A., Sherr, E. H., Shih, J. J., Shinnar, S., Sills, G. J., Singh, R. K., Siren, A., Sirven, J., Sisodiya, S. M., Smith, M. C., Sonsma, A. C. M., Striano, P., Sullivan, J., Thio, L. L., Thomas, R. H., Venkat, A., Vining, E. P. G., Von Allmen, G. K., Wang, Q., Weber, Y. G., Weckhuysen, S., Weisenberg, J. L., Widdess-Walsh, P., Winawer, M. R., Wolking, S., Zara, F., Zimprich, F., Canadian Epilepsy Network, Epi4K Consortium, Epilepsy Phenome/Genome Project, EpiPGX Consortium, EuroEPINOMICS-CoGIE Consortium, Department of Medical and Clinical Genetics, Medicum, Fonds National de la Recherche - FnR [sponsor], Luxembourg Centre for Systems Biomedicine (LCSB): Bioinformatics Core (R. Schneider Group) [research center], Peter, Sarah, Petrou, Steven, Petrovski, Slavé, Pickrell, William O., Poduri, Annapurna, Radtke, Rodney A., Rees, Mark I., Regan, Brigid M., Ren, Zhong, Sadleir, Lynette G., Alldredge, Brian K., Sander, Josemir W., Sander, Thomas, Scheffer, Ingrid E., Schubert, Julian, Shellhaas, Renée A., Sherr, Elliott H., Shih, Jerry J., Shinnar, Shlomo, Sills, Graeme J., Singh, Rani K., Allen, Andrew S., Siren, Auli, Sirven, Joseph, Sisodiya, Sanjay M., Smith, Michael C., Sonsma, Anja C. M., Striano, Pasquale, Sullivan, Joseph, Thio, Liu Lin, Thomas, Rhys H., Venkat, Anu, Altmüller, Janine, Vining, Eileen P. G., Von Allmen, Gretchen K., Wang, Quanli, Weber, Yvonne G., Weckhuysen, Sarah, Weisenberg, Judith L., Widdess-Walsh, Peter, Winawer, Melodie R., Wolking, Stefan, Zara, Federico, Amrom, Dina, Zimprich, Fritz, Andermann, Eva, Auce, Pauls, Avbersek, Andreja, Baulac, Stéphanie, Bautista, Jocelyn F., Becker, Felicitas, Bellows, Susannah T., Berghuis, Bianca, Berkovic, Samuel F., Bluvstein, Judith, Boro, Alex, Bridgers, Joshua, Burgess, Rosemary, Caglayan, Hande, Cascino, Gregory D., Cavalleri, Gianpiero L., Chung, Seo-Kyung, Cieuta-Walti, Cécile, Cloutier, Véronique, Consalvo, Damian, Cossette, Patrick, Crumrine, Patricia, Delanty, Norman, Depondt, Chantal, Desbiens, Richard, Devinsky, Orrin, Dlugos, Dennis, Epstein, Michael P., Everett, Kate, Fiol, Miguel, Fountain, Nathan B., Francis, Ben, French, Jacqueline, Freyer, Catharine, Friedman, Daniel, Gambardella, Antonio, Geller, Eric B., Girard, Simon, Glauser, Tracy, Glynn, Simon, Goldstein, David B., Gravel, Micheline, Haas, Kevin, Haut, Sheryl R., Heinzen, Erin L., Helbig, Ingo, Hildebrand, Michael S., Johnson, Michael R., Jorgensen, Andrea, Joshi, Sucheta, Kanner, Andres, Kirsch, Heidi E., Klein, Karl M., Knowlton, Robert C., Koeleman, Bobby P. C., Kossoff, Eric H., Krause, Roland, Krenn, Martin, Kunz, Wolfram S., Kuzniecky, Ruben, Langley, Sarah R., LeGuern, Eric, Lehesjoki, Anna-Elina, Lerche, Holger, Leu, Costin, Lortie, Anne, Lowenstein, Daniel H., Marson, Anthony G., Mebane, Caroline, Mefford, Heather C., Meloche, Caroline, Moreau, Claudia, Motika, Paul V., Muhle, Hiltrud, Møller, Rikke S., Nabbout, Rima, Nguyen, Dang K., Nikanorova, Marina, Novotny, Edward J., Nürnberg, Peter, Ottman, Ruth, O'Brien, Terence J., Paolicchi, Juliann M., Parent, Jack M., and Park, Kristen

Subjects
GABA receptors, Neurology [D14] [Human health sciences], Clinical Sciences, GABA(A) receptors, GABRG2, familial epilepsy, Article, Clinical Research, Receptors, Exome Sequencing, Genetics, 2.1 Biological and endogenous factors, Humans, GGE, Genetic Predisposition to Disease, sporadic epilepsy, EpiPGX Consortium, Aetiology, gamma-Aminobutyric Acid, GABAA receptors, Epi4K Consortium, Epilepsy, Neurology & Neurosurgery, Neurologie [D14] [Sciences de la santé humaine], Generalized, GABA-A, Prevention, Human Genome, Neurosciences, 1184 Genetics, developmental biology, physiology, 3112 Neurosciences, Receptors, GABA-A, EuroEPINOMICS-CoGIE Consortium, Neurology, Case-Control Studies, Epilepsy, Generalized, Canadian Epilepsy Network, Neurology (clinical), Genetics & genetic processes [F10] [Life sciences], 3111 Biomedicine, Human medicine, Génétique & processus génétiques [F10] [Sciences du vivant], Epilepsy Phenome/Genome Project
Abstract

ObjectiveWe aimed to identify genes associated with genetic generalized epilepsy (GGE) by combining large cohorts enriched with individuals with a positive family history. Secondarily, we set out to compare the association of genes independently with familial and sporadic GGE.MethodsWe performed a case-control whole exome sequencing study in unrelated individuals of European descent diagnosed with GGE (previously recruited and sequenced through multiple international collaborations) and ancestry-matched controls. The association of ultra-rare variants (URVs; in 18834 protein-coding genes) with epilepsy was examined in 1928 individuals with GGE (vs. 8578 controls), then separately in 945 individuals with familial GGE (vs. 8626 controls), and finally in 1005 individuals with sporadic GGE (vs. 8621 controls). We additionally examined the association of URVs with familial and sporadic GGE in two gene sets important for inhibitory signaling (19genes encoding γ-aminobutyric acid type A [GABAA ] receptors, 113genes representing the GABAergic pathway).ResultsGABRG2 was associated with GGE (p=1.8×10-5 ), approaching study-wide significance in familial GGE (p=3.0×10-6 ), whereas no gene approached a significant association with sporadic GGE. Deleterious URVs in the most intolerant subgenic regions in genes encoding GABAA receptors were associated with familial GGE (odds ratio [OR]=3.9, 95% confidence interval [CI]=1.9-7.8, false discovery rate [FDR]-adjusted p=.0024), whereas their association with sporadic GGE had marginally lower odds (OR=3.1, 95% CI=1.3-6.7, FDR-adjusted p=.022). URVs in GABAergic pathway genes were associated with familial GGE (OR=1.8, 95% CI=1.3-2.5, FDR-adjusted p=.0024) but not with sporadic GGE (OR=1.3, 95% CI=.9-1.9, FDR-adjusted p=.19).SignificanceURVs in GABRG2 are likely an important risk factor for familial GGE. The association of gene sets of GABAergic signaling with familial GGE is more prominent than with sporadic GGE.

Published
2022
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24. Rare coding variants in genes encoding GABAA receptors in genetic generalised epilepsies: an exome-based case-control study

Author

Patrick May, Simon Girard, Merle Harrer, Dheeraj R Bobbili, Julian Schubert, Stefan Wolking, Felicitas Becker, Pamela Lachance-Touchette, Caroline Meloche, Micheline Gravel, Cristina E Niturad, Julia Knaus, Carolien De Kovel, Mohamad Toliat, Anne Polvi, Michele Iacomino, Rosa Guerrero-López, Stéphanie Baulac, Carla Marini, Holger Thiele, Janine Altmüller, Kamel Jabbari, Ann-Kathrin Ruppert, Wiktor Jurkowski, Dennis Lal, Raffaella Rusconi, Sandrine Cestèle, Benedetta Terragni, Ian D Coombs, Christopher A Reid, Pasquale Striano, Hande Caglayan, Auli Siren, Kate Everett, Rikke S Møller, Helle Hjalgrim, Hiltrud Muhle, Ingo Helbig, Wolfram S Kunz, Yvonne G Weber, Sarah Weckhuysen, Peter De Jonghe, Sanjay M Sisodiya, Rima Nabbout, Silvana Franceschetti, Antonietta Coppola, Maria S Vari, Dorothée Kasteleijn-Nolst Trenité, Betul Baykan, Ugur Ozbek, Nerses Bebek, Karl M Klein, Felix Rosenow, Dang K Nguyen, François Dubeau, Lionel Carmant, Anne Lortie, Richard Desbiens, Jean-François Clément, Cécile Cieuta-Walti, Graeme J Sills, Pauls Auce, Ben Francis, Michael R Johnson, Anthony G Marson, Bianca Berghuis, Josemir W Sander, Andreja Avbersek, Mark McCormack, Gianpiero L Cavalleri, Norman Delanty, Chantal Depondt, Martin Krenn, Fritz Zimprich, Sarah Peter, Marina Nikanorova, Robert Kraaij, Jeroen van Rooij, Rudi Balling, M Arfan Ikram, André G Uitterlinden, Giuliano Avanzini, Stephanie Schorge, Steven Petrou, Massimo Mantegazza, Thomas Sander, Eric LeGuern, Jose M Serratosa, Bobby P C Koeleman, Aarno Palotie, Anna-Elina Lehesjoki, Michael Nothnagel, Peter Nürnberg, Snezana Maljevic, Federico Zara, Patrick Cossette, Roland Krause, Holger Lerche, Edoardo Ferlazzo, Carlo di Bonaventura, Angela La Neve, Paolo Tinuper, Francesca Bisulli, Aglaia Vignoli, Giuseppe Capovilla, Giovanni Crichiutti, Antonio Gambardella, Vincenzo Belcastro, Amedeo Bianchi, Destina Yalçın, Gulsen Dizdarer, Kezban Arslan, Zuhal Yapıcı, Demet Kuşcu, Costin Leu, Kristin Heggeli, Joseph Willis, Sarah R Langley, Andrea Jorgensen, Prashant Srivastava, Sarah Rau, Christian Hengsbach, Anja C.M. Sonsma, Université Côte d'Azur, CNRS, UMR 7275, Institut de Pharmacologie Moléculaire et Cellulaire, Sophia Antipolis, Erasmus University Medical Center [Rotterdam] (Erasmus MC), Laboratory of Molecular Genetics of Stem Cells [University of Montreal], University of Montreal-Institut de Recherche en Immunologie et en Cancérologie [UdeM-Montréal] (IRIC), Université de Montréal (UdeM)-Université de Montréal (UdeM), University of Tübingen, University Medical Center [Utrecht], Universita degli studi di Genova, Centre de Recherche de l'Institut du Cerveau et de la Moelle épinière (CRICM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), A.Meyer Children's Hospital, Max Planck Institute for Plant Breeding Research (MPIPZ), Génomique métabolique (UMR 8030), Genoscope - Centre national de séquençage [Evry] (GENOSCOPE), Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université d'Évry-Val-d'Essonne (UEVE)-Centre National de la Recherche Scientifique (CNRS), University of Cologne, The Genome Analysis Centre (TGAC), Cologne Center for Genomics, Institut de pharmacologie moléculaire et cellulaire (IPMC), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS), Ingénierie des protéines (IP), Université de la Méditerranée - Aix-Marseille 2-Centre National de la Recherche Scientifique (CNRS), Department of Neurophysiopathology, Besta Neurological Institute, University of Southern Denmark (SDU), Medical Genetics Laboratory, Children’s Hospital of Philadelphia (CHOP ), Universitätsklinikum Bonn (UKB), Antwerp University Hospital [Edegem] (UZA), University of Antwerp (UA), Department of Clinical and Experimental Epilepsy, University College of London [London] (UCL), Département de Neuropédiatrie, CHU Necker - Enfants Malades [AP-HP], Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP)-Assistance publique - Hôpitaux de Paris (AP-HP) (AP-HP), Instituco Neurologico C. Besta, Instituto Neurologico C. Besta, Medical Genetics and Pediatric Cardiology, IRCCS Ospedale Pediatrico Bambino Gesù [Roma], Département de mathématiques [Sherbrooke] (UdeS), Faculté des sciences [Sherbrooke] (UdeS), Université de Sherbrooke (UdeS)-Université de Sherbrooke (UdeS), University of Liverpool, Institute of Neurology [London], Royal College of Surgeons in Ireland (RCSI), Neurology Division, Beaumont Hospital, Dublin 9, Ireland, Beaumont Hospital, Hôpital Erasme [Bruxelles] (ULB), Faculté de Médecine [Bruxelles] (ULB), Université libre de Bruxelles (ULB)-Université libre de Bruxelles (ULB), Medizinische Universität Wien = Medical University of Vienna, Department of Epilepsy Clinic and Experimental Neurophysiology, Fondazione IRCCS Istituto Neurologico 'Carlo Besta', Broad Institute of MIT and Harvard (BROAD INSTITUTE), Harvard Medical School [Boston] (HMS)-Massachusetts Institute of Technology (MIT)-Massachusetts General Hospital [Boston], Department of Medical and Clinical Genetics [Helsinki], Haartman Institute [Helsinki], Faculty of Medecine [Helsinki], Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Faculty of Medecine [Helsinki], Helsingin yliopisto = Helsingfors universitet = University of Helsinki-Helsingin yliopisto = Helsingfors universitet = University of Helsinki, Institute of Medical Informatics and Statistics, Pediatric Neurology and Neuromuscular Diseases Unit, Centre Hospitalier de l'Université de Montréal (CHUM), Université de Montréal (UdeM), Hertie Institute for Clinical Brain Research [Tubingen], Regional Epilepsy Center, Reggio Calabria, Agronomes et Vétérinaires Sans Frontières (AVSF), AVSF, NIHR Biomedical Research Centre [London], Guy's and St Thomas' NHS Foundation Trust-King‘s College London, Wellcome Trust, Commission of the European Communities, Imperial College Healthcare NHS Trust- BRC Funding, Internal Medicine, Epidemiology, Luxembourg Centre For Systems Biomedicine (LCSB), University of Luxembourg [Luxembourg], Università degli studi di Genova = University of Genoa (UniGe), Heart Center Leipzig, University Medical Center of Schleswig–Holstein = Universitätsklinikum Schleswig-Holstein (UKSH), Kiel University, Acibadem University Dspace, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS)-Université d'Évry-Val-d'Essonne (UEVE), Université Nice Sophia Antipolis (... - 2019) (UNS), University of Helsinki-University of Helsinki-Faculty of Medecine [Helsinki], University of Helsinki-University of Helsinki, Centre of Excellence in Complex Disease Genetics, Aarno Palotie / Principal Investigator, Institute for Molecular Medicine Finland, Medicum, Research Programme for Molecular Neurology, Research Programs Unit, Neuroscience Center, University of Helsinki, Genomics of Neurological and Neuropsychiatric Disorders, Epicure Consortium, EuroEPINOMICS COGIE Consortium, EpiPGX Consortium, May, Gabriella, Girard, S., Harrer, M., Bobbili, D. R., Schubert, J., Wolking, S., Becker, F., Lachance-Touchette, P., Meloche, C., Gravel, M., Niturad, C. E., Knaus, J., De Kovel, C., Toliat, M., Polvi, A., Iacomino, M., Guerrero-López, R., Baulac, S., Marini, C., Thiele, H., Altmüller, J., Jabbari, K., Ruppert, A. -K., Jurkowski, W., Lal, D., Rusconi, R., Cestèle, S., Terragni, B., Coombs, I. D., Reid, C. A., Striano, P., Caglayan, H., Siren, A., Everett, K., Møller, R. S., Hjalgrim, H., Muhle, H., Helbig, I., Kunz, W. S., Weber, Y. G., Weckhuysen, S., Jonghe, P. D., Sisodiya, S. M., Nabbout, R., Franceschetti, S., Coppola, A., Vari, M. S., Kasteleijn-Nolst Trenité, D., Baykan, B., Ozbek, U., Bebek, N., Klein, K. M., Rosenow, F., Nguyen, D. K., Dubeau, F., Carmant, L., Lortie, A., Desbiens, R., Clément, J. -F., Cieuta-Walti, C., Sills, G. J., Auce, P., Francis, B., Johnson, M. R., Marson, A. G., Berghuis, B., Sander, J. W., Avbersek, A., Mccormack, M., Cavalleri, G. L., Delanty, N., Depondt, C., Krenn, M., Zimprich, F., Peter, S., Nikanorova, M., Kraaij, R., van Rooij, J., Balling, R., Ikram, M. A., Uitterlinden, A. G., Avanzini, Giulio, Schorge, S., Petrou, S., Mantegazza, M., Sander, T., Leguern, E., Serratosa, J. M., Koeleman, B. P. C., Palotie, A., Lehesjoki, A. -E., Nothnagel, M., Nürnberg, P., Maljevic, S., Zara, F., Cossette, P., Krause, R., Lerche, H., De Jonghe, P., Arfan Ikram, M., Ferlazzo, E., di Bonaventura, C., La Neve, A., Tinuper, P., Bisulli, F., Vignoli, Massimo, Capovilla, G., Crichiutti, G., Gambardella, A., Belcastro, V., Bianchi, A., Yalçın, D., Dizdarer, G., Arslan, K., Yapıcı, Z., Kuşcu, D., Leu, C., Heggeli, K., Willis, J., Langley, S. R., Jorgensen, A., Srivastava, P., Rau, S., Hengsbach, C., Sonsma, A. C. M., University of Montreal-Institute for Research in Immunology and Cancer (IRIC), Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Pierre et Marie Curie - Paris 6 (UPMC), Direction de Recherche Fondamentale (CEA) (DRF (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université d'Évry-Val-d'Essonne (UEVE), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Département de Mathématiques, Université de Sherbrooke, Université de Sherbrooke [Sherbrooke], Hôpital Erasme (Bruxelles), May, Patrick, Girard, Simon, Harrer, Merle, Bobbili, Dheeraj R, Schubert, Julian, Wolking, Stefan, Becker, Felicita, Lachance-Touchette, Pamela, Meloche, Caroline, Gravel, Micheline, Niturad, Cristina E, Knaus, Julia, De Kovel, Carolien, Toliat, Mohamad, Polvi, Anne, Iacomino, Michele, Guerrero-López, Rosa, Baulac, Stéphanie, Marini, Carla, Thiele, Holger, Altmüller, Janine, Jabbari, Kamel, Ruppert, Ann-Kathrin, Jurkowski, Wiktor, Lal, Denni, Rusconi, Raffaella, Cestèle, Sandrine, Terragni, Benedetta, Coombs, Ian D, Reid, Christopher A, Striano, Pasquale, Caglayan, Hande, Siren, Auli, Everett, Kate, Møller, Rikke S, Hjalgrim, Helle, Muhle, Hiltrud, Helbig, Ingo, Kunz, Wolfram S, Weber, Yvonne G, Weckhuysen, Sarah, Jonghe, Peter De, Sisodiya, Sanjay M, Nabbout, Rima, Franceschetti, Silvana, Coppola, Antonietta, Vari, Maria S, Kasteleijn-Nolst Trenité, Dorothée, Baykan, Betul, Ozbek, Ugur, Bebek, Nerse, Klein, Karl M, Rosenow, Felix, Nguyen, Dang K, Dubeau, Françoi, Carmant, Lionel, Lortie, Anne, Desbiens, Richard, Clément, Jean-Françoi, Cieuta-Walti, Cécile, Sills, Graeme J, Auce, Paul, Francis, Ben, Johnson, Michael R, Marson, Anthony G, Berghuis, Bianca, Sander, Josemir W, Avbersek, Andreja, McCormack, Mark, Cavalleri, Gianpiero L., Delanty, Norman, Depondt, Chantal, Krenn, Martin, Zimprich, Fritz, Peter, Sarah, Nikanorova, Marina, Kraaij, Robert, van Rooij, Jeroen, Balling, Rudi, Ikram, M Arfan, Uitterlinden, André G, Avanzini, Giuliano, Schorge, Stephanie, Petrou, Steven, Mantegazza, Massimo, Sander, Thoma, LeGuern, Eric, Serratosa, Jose M, Koeleman, Bobby P C, Palotie, Aarno, Lehesjoki, Anna-Elina, Nothnagel, Michael, Nürnberg, Peter, Maljevic, Snezana, Zara, Federico, Cossette, Patrick, Krause, Roland, Lerche, Holger, De Jonghe, Peter, Ferlazzo, Edoardo, di Bonaventura, Carlo, La Neve, Angela, Tinuper, Paolo, Bisulli, Francesca, Vignoli, Aglaia, Capovilla, Giuseppe, Crichiutti, Giovanni, Gambardella, Antonio, Belcastro, Vincenzo, Bianchi, Amedeo, Yalçın, Destina, Dizdarer, Gulsen, Arslan, Kezban, Yapıcı, Zuhal, Kuşcu, Demet, Leu, Costin, Heggeli, Kristin, Willis, Joseph, Langley, Sarah R, Jorgensen, Andrea, Srivastava, Prashant, Rau, Sarah, Hengsbach, Christian, and Sonsma, Anja C.M.

Subjects
0301 basic medicine, GAMMA-2-SUBUNIT, [SDV]Life Sciences [q-bio], GABRA5, Clinical Neurology, 15Q13.3 MICRODELETIONS, ABSENCE EPILEPSY, SEQUENCE DATA, [SDV.BC]Life Sciences [q-bio]/Cellular Biology, 3124 Neurology and psychiatry, 03 medical and health sciences, Epilepsy, 0302 clinical medicine, Genetic variation, medicine, EPILEPTIC ENCEPHALOPATHIES, Exome, Exome sequencing, ComputingMilieux_MISCELLANEOUS, Genetic association, Genetics, RISK, Science & Technology, FEBRILE SEIZURES, Neurology & Neurosurgery, biology, 3112 Neurosciences, 1103 Clinical Sciences, MOUSE MODEL, medicine.disease, ASSOCIATION ANALYSIS, 030104 developmental biology, DE-NOVO MUTATIONS, Cohort, biology.protein, Neurology (clinical), Human medicine, Neurosciences & Neurology, 1109 Neurosciences, Life Sciences & Biomedicine, 030217 neurology & neurosurgery, Cohort study
Abstract

BACKGROUND: Genetic generalised epilepsy is the most common type of inherited epilepsy. Despite a high concordance rate of 80% in monozygotic twins, the genetic background is still poorly understood. We aimed to investigate the burden of rare genetic variants in genetic generalised epilepsy.METHODS: For this exome-based case-control study, we used three different genetic generalised epilepsy case cohorts and three independent control cohorts, all of European descent. Cases included in the study were clinically evaluated for genetic generalised epilepsy. Whole-exome sequencing was done for the discovery case cohort, a validation case cohort, and two independent control cohorts. The replication case cohort underwent targeted next-generation sequencing of the 19 known genes encoding subunits of GABAA receptors and was compared to the respective GABAA receptor variants of a third independent control cohort. Functional investigations were done with automated two-microelectrode voltage clamping in Xenopus laevis oocytes.FINDINGS: Statistical comparison of 152 familial index cases with genetic generalised epilepsy in the discovery cohort to 549 ethnically matched controls suggested an enrichment of rare missense (Nonsyn) variants in the ensemble of 19 genes encoding GABAA receptors in cases (odds ratio [OR] 2·40 [95% CI 1·41-4·10]; pNonsyn=0·0014, adjusted pNonsyn=0·019). Enrichment for these genes was validated in a whole-exome sequencing cohort of 357 sporadic and familial genetic generalised epilepsy cases and 1485 independent controls (OR 1·46 [95% CI 1·05-2·03]; pNonsyn=0·0081, adjusted pNonsyn=0·016). Comparison of genes encoding GABAA receptors in the independent replication cohort of 583 familial and sporadic genetic generalised epilepsy index cases, based on candidate-gene panel sequencing, with a third independent control cohort of 635 controls confirmed the overall enrichment of rare missense variants for 15 GABAA receptor genes in cases compared with controls (OR 1·46 [95% CI 1·02-2·08]; pNonsyn=0·013, adjusted pNonsyn=0·027). Functional studies for two selected genes (GABRB2 and GABRA5) showed significant loss-of-function effects with reduced current amplitudes in four of seven tested variants compared with wild-type receptors.INTERPRETATION: Functionally relevant variants in genes encoding GABAA receptor subunits constitute a significant risk factor for genetic generalised epilepsy. Examination of the role of specific gene groups and pathways can disentangle the complex genetic architecture of genetic generalised epilepsy.FUNDING: EuroEPINOMICS (European Science Foundation through national funding organisations), Epicure and EpiPGX (Sixth Framework Programme and Seventh Framework Programme of the European Commission), Research Unit FOR2715 (German Research Foundation and Luxembourg National Research Fund).

Published
2018
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