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3. 16p11.2 600 kb Duplications confer risk for typical and atypical Rolandic epilepsy

Author

Reinthaler, Eva M., Lal, Dennis, Lebon, Sebastien, Hildebrand, Michael S., Dahl, Hans-Henrik M., Regan, Brigid M., Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Ronen, Gabriel M., Roche, Laurian, Gruber-Sedlmayr, Ursula, Geldner, Julia, Haberlandt, Edda, Hoffmann, Per, Herms, Stefan, Gieger, Christian, Waldenberger, Melanie, Franke, Andre, Wittig, Michael, Schoch, Susanne, Becker, Albert J., Hahn, Andreas, Männik, Katrin, Toliat, Mohammad R., Winterer, Georg, Lerche, Holger, Nürnberg, Peter, Mefford, Heather, Scheffer, Ingrid E., Berkovic, Samuel F., Beckmann, Jacques S., Sander, Thomas, Jacquemont, Sebastien, Reymond, Alexandre, Zimprich, Fritz, Neubauer, Bernd A., Reinthaler, Eva M., Zimprich, Fritz, Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Geldner, Julia, Gruber-Sedlmayr, Ursula, Haberlandt, Edda, Ronen, Gabriel M., Roche, Laurian, Lal, Dennis, Nürnberg, Peter, Sander, Thomas, Lerche, Holger, Neubauer, Bernd, Zimprich, Fritz, Mörzinger, Martina, Feucht, Martha, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S, Klitten, Laura L., Hjalgrim, Helle, Møller, Rikke S, Campus, Kiel, Helbig, Ingo, Muhle, Hiltrud, Ostertag, Philipp, von Spiczak, Sarah, Stephani, Ulrich, Nürnberg, Peter, Sander, Thomas, Trucks, Holger, Elger, Christian E., Kleefu-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Sander, Thomas, Schmitz, Bettina, Rosenow, Felix, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Becker, Felicitas, Weber, Yvonne, Lerche, Holger, Koeleman, Bobby P.C., de Kovel, Carolien, Lindhout, Dick, Lindhout, Dick, Ameil, Agnès, Andrieux, Joris, Bouquillon, Sonia, Boute, Odile, de Flandre, Jeanne, Cuisset, Jean Marie, Cuvellier, Jean-Christophe, Salengro, Roger, David, Albert, de Vries, Bert, Delrue, Marie-Ange, Doco-Fenzy, Martine, Fernandez, Bridget A., Heron, Delphine, Keren, Boris, Lebel, Robert, Leheup, Bruno, Lewis, Suzanne, Mencarelli, Maria Antonietta, Mignot, Cyril, Minet, Jean-Claude, Moerman, Alexandre, Morice-Picard, Fanny, Mucciolo, Mafalda, Ounap, Katrin, Pasquier, Laurent, Petit, Florence, Ragona, Francesca, Rajcan-Separovic, Evica, Renieri, Alessandra, Rieubland, Claudine, Sanlaville, Damien, Sarrazin, Elisabeth, Shen, Yiping, van Haelst, Mieke, and Silfhout, Anneke Vulto-van

Published
2014
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4. Reduction of seizure frequency after epilepsy surgery in a patient with STXBP1 encephalopathy and clinical description of six novel mutation carriers

Author

Weckhuysen, Sarah, Holmgren, Philip, Hendrickx, Rik, Jansen, Anna C., Hasaerts, Daniele, Dielman, Charlotte, de Bellescize, Julitta, Boutry-Kryza, Nadia, Lesca, Gaetan, Spiczak, Sarah Von, Helbig, Ingo, Gill, Deepak, Yendle, Simone, Mller, Rikke S., Klitten, Laura, Korff, Christian, Godfraind, Catherine, Van Rijckevorsel, Kenou, De Jonghe, Peter, Hjalgrim, Helle, Scheffer, Ingrid E., and Suls, Arvid

Published
2013
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5. Exon-disrupting deletions of NRXN1 in idiopathic generalized epilepsy

Author

Mller, Rikke S., Weber, Yvonne G., Klitten, Laura L., Trucks, Holger, Muhle, Hiltrud, Kunz, Wolfram S., Mefford, Heather C., Franke, Andre, Kautza, Monika, Wolf, Peter, Dennig, Dieter, Schreiber, Stefan, Rückert, Ina-Maria, Wichmann, H.-Erich, Ernst, Jan P., Schurmann, Claudia, Grabe, Hans J., Tommerup, Niels, Stephani, Ulrich, Lerche, Holger, Hjalgrim, Helle, Helbig, Ingo, and Sander, Thomas

Published
2013
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6. Mutations in SYNGAP1 Cause Intellectual Disability, Autism, and a Specific Form of Epilepsy by Inducing Haploinsufficiency

Author

Berryer, Martin H., Hamdan, Fadi F., Klitten, Laura L., Mller, Rikke S., Carmant, Lionel, Schwartzentruber, Jeremy, Patry, Lysanne, Dobrzeniecka, Sylvia, Rochefort, Daniel, Neugnot-Cerioli, Mathilde, Lacaille, Jean-Claude, Niu, Zhiyv, Eng, Christine M., Yang, Yaping, Palardy, Sylvain, Belhumeur, Céline, Rouleau, Guy A., Tommerup, Niels, Immken, LaDonna, Beauchamp, Miriam H., Patel, Gayle Simpson, Majewski, Jacek, Tarnopolsky, Mark A., Scheffzek, Klaus, Hjalgrim, Helle, Michaud, Jacques L., and Di Cristo, Graziella

Published
2013
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10. 16p11.2 600 kb Duplications confer risk for typical and atypical Rolandic epilepsy

Author

Reinthaler, Eva M., Lal, Dennis, Lebon, Sebastien, Hildebrand, Michael S., Dahl, Hans-Henrik M., Regan, Brigid M., Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Ronen, Gabriel M., Roche, Laurian, Gruber-Sedlmayr, Ursula, Geldner, Julia, Haberlandt, Edda, Hoffmann, Per, Herms, Stefan, Gieger, Christian, Waldenberger, Melanie, Franke, Andre, Wittig, Michael, Schoch, Susanne, Becker, Albert J., Hahn, Andreas, Männik, Katrin, Toliat, Mohammad R., Winterer, Georg, Lerche, Holger, Nürnberg, Peter, Mefford, Heather, Scheffer, Ingrid E., Berkovic, Samuel F., Beckmann, Jacques S., Sander, Thomas, Jacquemont, Sebastien, Reymond, Alexandre, Zimprich, Fritz, Neubauer, Bernd A., Neubauer, Bernd, Mörzinger, Martina, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Helbig, Ingo, Muhle, Hiltrud, Ostertag, Philipp, von Spiczak, Sarah, Stephani, Ulrich, Trucks, Holger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Rosenow, Felix, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Becker, Felicitas, Weber, Yvonne, Koeleman, Bobby P.C., de Kovel, Carolien, Lindhout, Dick, Ameil, Agnès, Andrieux, Joris, Bouquillon, Sonia, Boute, Odile, de Flandre, Jeanne, Cuisset, Jean Marie, Cuvellier, Jean-Christophe, Salengro, Roger, David, Albert, de Vries, Bert, Delrue, Marie-Ange, Doco-Fenzy, Martine, Fernandez, Bridget A., Heron, Delphine, Keren, Boris, Lebel, Robert, Leheup, Bruno, Lewis, Suzanne, Mencarelli, Maria Antonietta, Mignot, Cyril, Minet, Jean-Claude, Moerman, Alexandre, Morice-Picard, Fanny, Mucciolo, Mafalda, Ounap, Katrin, Pasquier, Laurent, Petit, Florence, Ragona, Francesca, Rajcan-Separovic, Evica, Renieri, Alessandra, Rieubland, Claudine, Sanlaville, Damien, Sarrazin, Elisabeth, Shen, Yiping, van Haelst, Mieke, and Silfhout, Anneke Vulto-van

Abstract

Rolandic epilepsy (RE) is the most common idiopathic focal childhood epilepsy. Its molecular basis is largely unknown and a complex genetic etiology is assumed in the majority of affected individuals. The present study tested whether six large recurrent copy number variants at 1q21, 15q11.2, 15q13.3, 16p11.2, 16p13.11 and 22q11.2 previously associated with neurodevelopmental disorders also increase risk of RE. Our association analyses revealed a significant excess of the 600 kb genomic duplication at the 16p11.2 locus (chr16: 29.5-30.1 Mb) in 393 unrelated patients with typical (n = 339) and atypical (ARE; n = 54) RE compared with the prevalence in 65 046 European population controls (5/393 cases versus 32/65 046 controls; Fisher's exact test P = 2.83 × 10−6, odds ratio = 26.2, 95% confidence interval: 7.9-68.2). In contrast, the 16p11.2 duplication was not detected in 1738 European epilepsy patients with either temporal lobe epilepsy (n = 330) and genetic generalized epilepsies (n = 1408), suggesting a selective enrichment of the 16p11.2 duplication in idiopathic focal childhood epilepsies (Fisher's exact test P = 2.1 × 10−4). In a subsequent screen among children carrying the 16p11.2 600 kb rearrangement we identified three patients with RE-spectrum epilepsies in 117 duplication carriers (2.6%) but none in 202 carriers of the reciprocal deletion. Our results suggest that the 16p11.2 duplication represents a significant genetic risk factor for typical and atypical RE

Published
2017

11. Investigation of GRIN2A in common epilepsy phenotypes

Author

Lal, Dennis, Steinbrücker, Sandra, Schubert, Julian, Sander, Thomas, Becker, Felicitas, Weber, Yvonne, Lerche, Holger, Thiele, Holger, Krause, Roland, Lehesjoki, Anna Elina, Nürnberg, Peter, Palotie, Aarno, Neubauer, Bernd A., Muhle, Hiltrud, Stephani, Ulrich, Helbig, Ingo, Becker, Albert J., Schoch, Susanne, Hansen, Jörg, Dorn, Thomas, Hohl, Christin, Lüscher, Nicole, von Spiczak, Sarah, Lemke, Johannes R., Zimprich, Fritz, Feucht, Martha, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Dyck, Tine Van, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Ostertag, Philipp, Trucks, Hol ger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Rosenow, Felix, Kapser, Claudia, Schankin, Christoph J., Koeleman, Bobby P C, de Kovel, Carolien, Lindhout, Dick, Reinthaler, Eva M., Steinboeck, Hannelore, Neo-phytou, Birgit, Geldner, Julia, Gruber-Sedlmayr, Ursula, Haberlandt, Edda, Ronen, Gabriel M., Altmueller, Janine, Nuernberg, Peter, Neubauer, Bernd, Sirén, Auli, Neuroscience Center, Research Programs Unit, Department of Medical and Clinical Genetics, Anna-Elina Lehesjoki / Principal Investigator, Research Programme for Molecular Neurology, Medicum, Institute for Molecular Medicine Finland, Aarno Palotie / Principal Investigator, Genomics of Neurological and Neuropsychiatric Disorders, Suls, Arvid, Weckhuysen, Sarah, Claes, Godelieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Epicure Consortium, and EuroEPINOMICS-CoGIE Consortium

Subjects
Pathology, Idiopathic generalized epilepsy, DEPDC5, Genotyping Techniques, CHILDHOOD, Bioinformatics, GRIN2A, 3124 Neurology and psychiatry, Cohort Studies, Epilepsy, 0302 clinical medicine, Databases, Genetic, Medicine, Copy-number variation, TERMINOLOGY, Non-U.S. Gov't, Temporal lobe epilepsy, FOCAL EPILEPSIES, Exome sequencing, Sanger sequencing, 0303 health sciences, Research Support, Non-U.S. Gov't, Phenotype, Neurology, symbols, Epilepsy, Generalized, medicine.medical_specialty, DNA Copy Number Variations, DISORDERS, Clinical Neurology, Research Support, Receptors, N-Methyl-D-Aspartate, CLASSIFICATION, Juvenile Absence Epilepsy, 03 medical and health sciences, symbols.namesake, Journal Article, Humans, Biology, 030304 developmental biology, business.industry, MUTATIONS, Copy number variation, 3112 Neurosciences, INCLUDING GRIN2A, medicine.disease, DELETIONS, Epilepsy, Absence, Epilepsy, Temporal Lobe, Epilepsy syndromes, Mutation, SEIZURES, Neurology (clinical), Human medicine, business, 030217 neurology & neurosurgery
Abstract

Recently, mutations and deletions in the GRIN2A gene have been identified to predispose to benign and severe idiopathic focal epilepsies (IFE), revealing a higher incidence of GRIN2A alterations among the more severe phenotypes. This study aimed to explore the phenotypic boundaries of GRIN2A mutations by investigating patients with the two most common epilepsy syndromes: (i) idiopathic generalized epilepsy (IGE) and (ii) temporal lobe epilepsy (TLE). Whole exome sequencing data of 238 patients with IGE as well as Sanger sequencing of 84 patients with TLE were evaluated for GRIN2A sequence alterations. Two additional independent cohorts comprising 1469 IGE and 330 TLE patients were screened for structural deletions (>40 kb) involving GRIN2A. Apart from a presumably benign, non-segregating variant in a patient with juvenile absence epilepsy, neither mutations nor deletions were detected in either cohort. These findings suggest that mutations in GRIN2A preferentially are involved in genetic variance of pediatric IFE and do not contribute significantly to either adult focal epilepsies as TLE or generalized epilepsies. (C) 2015 Elsevier B.V. All rights reserved.

Published
2015
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13. The role of SCL2A1 in Early Onset and Childhood Absence Epilepsies

Author

Muhle, Hiltrud, Helbig, Ingo, Frøslev, Tobias Guldberg, Suls, Arvid, von Spiczak, Sarah, Klitten, Laura Line, Dahl, Hans Atli, Neubauer, Bernd, De Jonghe, Peter, Tommerup, Niels, Stephani, Ulrich, Hjalgrim, Helle, and Møller, Rikke S

Abstract

Introduction: Early onset absence epilepsy (EOAE) constitutes an idiopathic generalized epilepsy syndrome with typical absences starting before the age of four years. Mutations in SLC2A1, encoding the glucose transporter of the blood-brain barrier (GLUT-1), account for approximately 10% of EOAE cases. The role of SLC2A1 mutations in absence epilepsies with a later onset has not been assessed so far. Therefore, we aimed to compare the role of SLC2A1 mutations in EOAE and Childhood and Juvenile Absence Epilepsy (CAE, JAE). Method: 26 cases with EOAE and 40 probands with CAE or JAE were screened for SCL2A1 mutations by sequence analysis. Extensive phenotyping was performed in patients and family members. Results: Mutations in SLC2A1 were detected in 2/26 EOAE patients and 0/40 patients with familial absence epilepsy. One EOAE patient with a mild phenotype had a variant in exon 8 (c.1008G>C) leading to an amino acid exchange (336Leu>Val), the family history was unremarkable. The other EOAE patient with a very early onset of a severe epilepsy phenotype and movement disorder had a base exchange at position c.1189C>T causing a stop codon (p.Q397X) in exon 9. Familial GTCS were reported in his brother and the paternal grandmother.Conclusion: Our study confirmed the role of SLC2A1 mutation carriers in EOAE and demonstrated that SLC2A1 do not seem to play a major role in CAE and JAE. Since ketogenic diet is a well known treatment option in GLUT-1-deficiency, pediatricians as well as neurologists may revisit the age of onset in patients diagnosed with absence epilepsies.

Published
2011

14. A balanced translocation disrupts SYNGAP1 in a patient with intellectual disability, speech impairment, and epilepsy with myoclonic absences (EMA)

Author

Klitten, Laura L, Møller, Rikke Steensbjerre, Nikanorova, Marina, Silahtaroglu, Asli, Hjalgrim, Helle, and Tommerup, Niels

Abstract

Epilepsy with myoclonic absences (EMA) is a rare form of generalized epilepsy occurring in childhood and is often difficult to treat. The underlying etiology of EMA is unknown in the majority of patients. Herein, we describe a patient with EMA and intellectual disability who carries a de novo balanced translocation: t(6;22)(p21.32;q11.21). We mapped the translocation breakpoints by fluorescence in situ hybridization (FISH), and the breakpoint at 6p21.32 was found to truncate the N-methyl-d-aspartate (NMDA)-receptor associated gene SYNGAP1. The breakpoint at 22q11.21 was within a highly variable region without known protein-coding genes. Mutations of SYNGAP1 are associated with nonsyndromal intellectual disability (NSID). Two-thirds of the patients described so far also have generalized epilepsy. This finding, together with our report, suggests that dysfunction of SYNGAP1 contributes to the development of generalized epilepsy, including EMA.

Published
2011
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15. Investigation of GRIN2A in common epilepsy phenotypes

Author

Genetica Groep Koeleman, Circulatory Health, Child Health, Brain, Genetica Klinische Genetica, Lal, Dennis, Steinbrücker, Sandra, Schubert, Julian, Sander, Thomas, Becker, Felicitas, Weber, Yvonne, Lerche, Holger, Thiele, Holger, Krause, Roland, Lehesjoki, Anna Elina, Nürnberg, Peter, Palotie, Aarno, Neubauer, Bernd A., Muhle, Hiltrud, Stephani, Ulrich, Helbig, Ingo, Becker, Albert J., Schoch, Susanne, Hansen, Jörg, Dorn, Thomas, Hohl, Christin, Lüscher, Nicole, von Spiczak, Sarah, Lemke, Johannes R., Zimprich, Fritz, Feucht, Martha, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Dyck, Tine Van, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Ostertag, Philipp, Trucks, Hol ger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Rosenow, Felix, Kapser, Claudia, Schankin, Christoph J., Koeleman, Bobby P C, de Kovel, Carolien, Lindhout, Dick, Reinthaler, Eva M., Steinboeck, Hannelore, Neo-phytou, Birgit, Geldner, Julia, Gruber-Sedlmayr, Ursula, Haberlandt, Edda, Ronen, Gabriel M., Altmueller, Janine, Nuernberg, Peter, Neubauer, Bernd, Sirén, Auli, Genetica Groep Koeleman, Circulatory Health, Child Health, Brain, Genetica Klinische Genetica, Lal, Dennis, Steinbrücker, Sandra, Schubert, Julian, Sander, Thomas, Becker, Felicitas, Weber, Yvonne, Lerche, Holger, Thiele, Holger, Krause, Roland, Lehesjoki, Anna Elina, Nürnberg, Peter, Palotie, Aarno, Neubauer, Bernd A., Muhle, Hiltrud, Stephani, Ulrich, Helbig, Ingo, Becker, Albert J., Schoch, Susanne, Hansen, Jörg, Dorn, Thomas, Hohl, Christin, Lüscher, Nicole, von Spiczak, Sarah, Lemke, Johannes R., Zimprich, Fritz, Feucht, Martha, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Dyck, Tine Van, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Ostertag, Philipp, Trucks, Hol ger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Rosenow, Felix, Kapser, Claudia, Schankin, Christoph J., Koeleman, Bobby P C, de Kovel, Carolien, Lindhout, Dick, Reinthaler, Eva M., Steinboeck, Hannelore, Neo-phytou, Birgit, Geldner, Julia, Gruber-Sedlmayr, Ursula, Haberlandt, Edda, Ronen, Gabriel M., Altmueller, Janine, Nuernberg, Peter, Neubauer, Bernd, and Sirén, Auli

Published
2015

16. Dysregulation of FOXG1 by ring chromosome 14

Author

Alosi, Daniela, Klitten, Laura Line, Bak, Mads, Hjalgrim, Helle, Møller, Rikke Steensbjerre, Tommerup, Niels, Alosi, Daniela, Klitten, Laura Line, Bak, Mads, Hjalgrim, Helle, Møller, Rikke Steensbjerre, and Tommerup, Niels

Abstract

In this study we performed molecular characterization of a patient with an extra ring chromosome derived from chromosome 14, with severe intellectual disability, epilepsy, cerebral paresis, tetraplegia, osteoporosis and severe thoraco-lumbal scoliosis. Array CGH analysis did not show any genomic imbalance but conventional karyotyping and FISH analysis revealed the presence of an interstitial 14q12q24.3 deletion and an extra ring chromosome derived from the deleted material. The deletion and ring chromosome breakpoints were identified at base-pair level by mate-pair and Sanger sequencing. Both breakpoints disrupted putative long non-coding RNA genes (TCONS00022561;RP11-148E17.1) of unknown function. However, the proximal breakpoint was 225 kb downstream of the forkhead box G1 gene (FOXG1), within the known regulatory landscape of FOXG1. The patient represents the first case of a r(14) arising from an interstitial excision where the phenotype is compatible with dysregulation of FOXG1. In turn, the phenotypic overlap between the present case, the FOXG1 syndrome and the r(14) syndrome supports that dysregulation of FOXG1 may contribute to the classical r(14)-syndrome, likely mediated by dynamic mosaicism.

Published
2015

17. Two rare deletions upstream of the NRXN1 gene (2p16.3) affecting the non-coding mRNA AK127244 segregate with diverse psychopathological phenotypes in a family

Author

Duong, Linh T. T., Hoeffding, Louise K., Petersen, Kirsten B., Knudsen, Charlotte D., Thygesen, Johan H., Klitten, Laura L., Tommerup, Niels, Ingason, Andres, Werge, Thomas, Duong, Linh T. T., Hoeffding, Louise K., Petersen, Kirsten B., Knudsen, Charlotte D., Thygesen, Johan H., Klitten, Laura L., Tommerup, Niels, Ingason, Andres, and Werge, Thomas

Published
2015

19. Reduced ceramide synthase 2 activity causes progressive myoclonic epilepsy

Author

Mosbech, Mai-Britt, Olsen, Anne S B, Neess, Ditte, Ben-David, Oshrit, Klitten, Laura L, Larsen, Jan, Sabers, Anne, Vissing, John, Nielsen, Jørgen E, Hasholt, Lis, Klein, Andres D, Tsoory, Michael M, Hjalgrim, Helle, Tommerup, Niels, Futerman, Anthony H, Møller, Rikke S, Færgeman, Nils J, Mosbech, Mai-Britt, Olsen, Anne S B, Neess, Ditte, Ben-David, Oshrit, Klitten, Laura L, Larsen, Jan, Sabers, Anne, Vissing, John, Nielsen, Jørgen E, Hasholt, Lis, Klein, Andres D, Tsoory, Michael M, Hjalgrim, Helle, Tommerup, Niels, Futerman, Anthony H, Møller, Rikke S, and Færgeman, Nils J

Abstract

OBJECTIVE: Ceramides are precursors of complex sphingolipids (SLs), which are important for normal functioning of both the developing and mature brain. Altered SL levels have been associated with many neurodegenerative disorders, including epilepsy, although few direct links have been identified between genes involved in SL metabolism and epilepsy.METHODS: We used quantitative real-time PCR, Western blotting, and enzymatic assays to determine the mRNA, protein, and activity levels of ceramide synthase 2 (CERS2) in fiibroblasts isolated from parental control subjects and from a patient diagnosed with progressive myoclonic epilepsy (PME). Mass spectrometry and fluorescence microscopy were used to examine the effects of reduced CERS2 activity on cellular lipid composition and plasma membrane functions.RESULTS: We identify a novel 27 kb heterozygous deletion including the CERS2 gene in a proband diagnosed with PME. Compared to parental controls, levels of CERS2 mRNA, protein, and activity were reduced by ˜50% in fibroblasts isolated from this proband, resulting in significantly reduced levels of ceramides and sphingomyelins containing the very long-chain fatty acids C24:0 and C26:0. The change in SL composition was also reflected in a reduction in cholera toxin B immunofluorescence, indicating that membrane composition and function are altered.INTERPRETATION: We propose that reduced levels of CERS2, and consequently diminished levels of ceramides and SLs containing very long-chain fatty acids, lead to development of PME.

Published
2014

20. Reduction of seizure frequency after epilepsy surgery in a patient with STXBP1 encephalopathy and clinical description of six novel mutation carriers

Author

UCL - (SLuc) Service d'anatomie pathologique, UCL - (SLuc) Centre de référence pour l'épilepsie réfractaire, Weckhuysen, Sarah, Holmgren, Philip, Hendrickx, Rik, Jansen, Anna C, Hasaerts, Daniele, Dielman, Charlotte, de Bellescize, Julitta, Boutry-Kryza, Nadia, Lesca, Gaetan, Von Spiczak, Sarah, Helbig, Ingo, Gill, Deepak, Yendle, Simone, Møller, Rikke S, Klitten, Laura, Korff, Christian, Godfraind, Catherine, Van Rijckevorsel , Kenou, De Jonghe, Peter, Hjalgrim, Helle, Scheffer, Ingrid E, Suls, Arvid, UCL - (SLuc) Service d'anatomie pathologique, UCL - (SLuc) Centre de référence pour l'épilepsie réfractaire, Weckhuysen, Sarah, Holmgren, Philip, Hendrickx, Rik, Jansen, Anna C, Hasaerts, Daniele, Dielman, Charlotte, de Bellescize, Julitta, Boutry-Kryza, Nadia, Lesca, Gaetan, Von Spiczak, Sarah, Helbig, Ingo, Gill, Deepak, Yendle, Simone, Møller, Rikke S, Klitten, Laura, Korff, Christian, Godfraind, Catherine, Van Rijckevorsel , Kenou, De Jonghe, Peter, Hjalgrim, Helle, Scheffer, Ingrid E, and Suls, Arvid

Abstract

Mutations in STXBP1 have been identified in a subset of patients with early onset epileptic encephalopathy (EE), but the full phenotypic spectrum remains to be delineated. Therefore, we screened a cohort of 160 patients with an unexplained EE, including patients with early myoclonic encephalopathy (EME), Ohtahara syndrome, West syndrome, nonsyndromic EE with onset in the first year, and Lennox-Gastaut syndrome (LGS). We found six de novo mutations in six patients presenting as Ohtahara syndrome (2/6, 33%), West syndrome (1/65, 2%), and nonsyndromic early onset EE (3/64, 5%). No mutations were found in LGS or EME. Only two of four mutation carriers with neonatal seizures had Ohtahara syndrome. Epileptic spasms were present in five of six patients. One patient with normal magnetic resonance imaging (MRI) but focal seizures underwent epilepsy surgery and seizure frequency dropped drastically. Neuropathology showed a focal cortical dysplasia type 1a. There is a need for additional neuropathologic studies to explore whether STXBP1 mutations can lead to structural brain abnormalities.

Published
2013

21. Exon-disrupting deletions of NRXN1 in idiopathic generalized epilepsy

Author

Møller, Rikke S, Weber, Yvonne G, Klitten, Laura L, Trucks, Holger, Muhle, Hiltrud, Kunz, Wolfram S, Mefford, Heather C, Franke, Andre, Kautza, Monika, Wolf, Peter, Dennig, Dieter, Schreiber, Stefan, Rückert, Ina-Maria, Wichmann, H-Erich, Ernst, Jan P, Schurmann, Claudia, Grabe, Hans J, Tommerup, Niels, Stephani, Ulrich, Lerche, Holger, Hjalgrim, Helle, Helbig, Ingo, Sander, Thomas, Møller, Rikke S, Weber, Yvonne G, Klitten, Laura L, Trucks, Holger, Muhle, Hiltrud, Kunz, Wolfram S, Mefford, Heather C, Franke, Andre, Kautza, Monika, Wolf, Peter, Dennig, Dieter, Schreiber, Stefan, Rückert, Ina-Maria, Wichmann, H-Erich, Ernst, Jan P, Schurmann, Claudia, Grabe, Hans J, Tommerup, Niels, Stephani, Ulrich, Lerche, Holger, Hjalgrim, Helle, Helbig, Ingo, and Sander, Thomas

Abstract

Neurexins are neuronal adhesion molecules located in the presynaptic terminal, where they interact with postsynaptic neuroligins to form a transsynaptic complex required for efficient neurotransmission in the brain. Recently, deletions and point mutations of the neurexin 1 (NRXN1) gene have been associated with a broad spectrum of neuropsychiatric disorders. This study aimed to investigate if NRXN1 deletions also increase the risk of idiopathic generalized epilepsies (IGEs).

Published
2013

22. Mutations in SYNGAP1 Cause Intellectual Disability, Autism, and a Specific Form of Epilepsy by Inducing Haploinsufficiency

Author

Berryer, Martin H, Hamdan, Fadi F, Klitten, Laura L, Møller, Rikke S, Carmant, Lionel, Schwartzentruber, Jeremy, Patry, Lysanne, Dobrzeniecka, Sylvia, Rochefort, Daniel, Neugnot-Cerioli, Mathilde, Lacaille, Jean-Claude, Niu, Zhiyv, Eng, Christine M, Yang, Yaping, Palardy, Sylvain, Belhumeur, Céline, Rouleau, Guy A, Tommerup, Niels, Immken, Ladonna, Beauchamp, Miriam H, Patel, Gayle Simpson, Majewski, Jacek, Tarnopolsky, Mark A, Scheffzek, Klaus, Hjalgrim, Helle, Michaud, Jacques L, Di Cristo, Graziella, Berryer, Martin H, Hamdan, Fadi F, Klitten, Laura L, Møller, Rikke S, Carmant, Lionel, Schwartzentruber, Jeremy, Patry, Lysanne, Dobrzeniecka, Sylvia, Rochefort, Daniel, Neugnot-Cerioli, Mathilde, Lacaille, Jean-Claude, Niu, Zhiyv, Eng, Christine M, Yang, Yaping, Palardy, Sylvain, Belhumeur, Céline, Rouleau, Guy A, Tommerup, Niels, Immken, Ladonna, Beauchamp, Miriam H, Patel, Gayle Simpson, Majewski, Jacek, Tarnopolsky, Mark A, Scheffzek, Klaus, Hjalgrim, Helle, Michaud, Jacques L, and Di Cristo, Graziella

Abstract

De novo mutations in SYNGAP1, which codes for a RAS/RAP GTP-activating protein, cause nonsyndromic intellectual disability (NSID). All disease-causing point mutations identified until now in SYNGAP1 are truncating, raising the possibility of an association between this type of mutations and NSID. Here, we report the identification of the first pathogenic missense mutations (c.1084T>C [p.W362R], c.1685C>T [p.P562L]) and three novel truncating mutations (c.283dupC [p.H95PfsX5], c.2212_2213del [p.S738X], and (c.2184del [p.N729TfsX31]) in SYNGAP1 in patients with NSID. A subset of these patients also showed ataxia, autism, and a specific form of generalized epilepsy that can be refractory to treatment. All of these mutations occurred de novo, except c.283dupC, which was inherited from a father who is a mosaic. Biolistic transfection of wild-type SYNGAP1 in pyramidal cells from cortical organotypic cultures significantly reduced activity-dependent phosphorylated extracellular signal-regulated kinase (pERK) levels. In contrast, constructs expressing p.W362R, p.P562L, or the previously described p.R579X had no significant effect on pERK levels. These experiments suggest that the de novo missense mutations, p.R579X, and possibly all the other truncating mutations in SYNGAP1 result in a loss of its function. Moreover, our study confirms the involvement of SYNGAP1 in autism while providing novel insight into the epileptic manifestations associated with its disruption.

Published
2013

23. Mutations in NRXN1 in a family multiply affected with brain disorders:NRXN1 mutations and brain disorders

Author

Duong, Linh, Klitten, Laura L, Møller, Rikke S, Ingason, Andrés, Jakobsen, Klaus D, Skjødt, Celina, Didriksen, Michael, Hjalgrim, Helle, Werge, Thomas, Tommerup, Niels, Duong, Linh, Klitten, Laura L, Møller, Rikke S, Ingason, Andrés, Jakobsen, Klaus D, Skjødt, Celina, Didriksen, Michael, Hjalgrim, Helle, Werge, Thomas, and Tommerup, Niels

Abstract

Mutation of the neurexin1-gene, NRXN1, interrupting the expression of neurexin1 has been associated with schizophrenia, autism, and intellectual disability. We have identified a family multiply affected with psychiatric, neurological, and somatic disorders along with an intricate co-segregation of NRXN1 mutations. The proband suffered from autism, mental retardation, and epilepsy and on genotyping it was revealed that he carried a compound heterozygous mutation in the NRXN1 consisting of a 451¿kb deletion, affecting the promoter and first introns in addition to a point mutation, predicted to be deleterious to NRXN1. The deletion was passed on from the patient's mother who was clinically characterized by sub-diagnostic autistic traits in addition to type 1 diabetes mellitus. The point mutation was subsequently found in the patient's brother, suffering from a psychotic disorder, which implies that the point mutation was inherited from the deceased father, who was diagnosed with schizophrenia. The observations suggest a possible gene-dose effect of NRXN1 mutations on type and severity of mental illness and support the notion that the penetrance and pleiotropy of pathogenic CNVs in general are determined by additional genetic variants in the genome. Finally the findings also propose a linkage of NRXN1 neurobiology to epilepsy and possibly to type 1 diabetes.

Published
2012

28. Reduced ceramide synthase 2 activity causes progressive myoclonic epilepsy

Author

Mosbech, Mai‐Britt, primary, Olsen, Anne S. B., additional, Neess, Ditte, additional, Ben‐David, Oshrit, additional, Klitten, Laura L., additional, Larsen, Jan, additional, Sabers, Anne, additional, Vissing, John, additional, Nielsen, Jørgen E., additional, Hasholt, Lis, additional, Klein, Andres D., additional, Tsoory, Michael M., additional, Hjalgrim, Helle, additional, Tommerup, Niels, additional, Futerman, Anthony H., additional, Møller, Rikke S., additional, and Færgeman, Nils J., additional

Published
2014
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29. Localization and regulation of dopamine receptor D4 expression in the adult and developing rat retina

Author

Klitten, Laura L, Rath, Martin F, Coon, Steven L, Kim, Jong-So, Klein, David C, Møller, Morten, Klitten, Laura L, Rath, Martin F, Coon, Steven L, Kim, Jong-So, Klein, David C, and Møller, Morten

Abstract

Udgivelsesdato: 2008-Nov, Levels of dopamine and melatonin exhibit diurnal rhythms in the rat retina. Dopamine is high during daytime adapting the retina to light, whereas melatonin is high during nighttime participating in the adaptation of the retina to low light intensities. Dopamine inhibits the synthesis of melatonin in the photoreceptors via Drd4 receptors located on the cell membrane of these cells. In this study, we show by semiquantitative in situ hybridization a prominent day/night variation in Drd4 expression in the retina of the Sprague-Dawley rat with a peak during the nighttime. Drd4 expression is seen in all retinal layers but the nocturnal increase is confined to the photoreceptors. Retinal Drd4 expression is not affected by removal of the sympathetic input to the eye, but triiodothyronine treatment induces Drd4 expression in the photoreceptors. In a developmental series, we show that the expression of Drd4 is restricted to postnatal stages with a peak at postnatal day 12. The high Drd4 expression in the rat retinal photoreceptors during the night supports physiological and pharmacologic evidence that the Drd4 receptor is involved in the dopaminergic inhibition of melatonin synthesis upon light stimulation. The sharp increase of Drd4 expression at a specific postnatal time suggests that dopamine is involved in retinal development.

Published
2008

30. Atypical Vitamin B6Deficiency

Author

Baumgart, Anna, primary, Spiczak, Sarah von, additional, Verhoeven-Duif, Nanda M., additional, Møller, Rikke S., additional, Boor, Rainer, additional, Muhle, Hiltrud, additional, Jähn, Johanna A., additional, Klitten, Laura L., additional, Hjalgrim, Helle, additional, Lindhout, Dick, additional, Stephani, Ulrich, additional, van Kempen, Marjan J. A., additional, and Helbig, Ingo, additional

Published
2013
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31. Reduction of seizure frequency after epilepsy surgery in a patient withSTXBP1encephalopathy and clinical description of six novel mutation carriers

Author

Weckhuysen, Sarah, primary, Holmgren, Philip, additional, Hendrickx, Rik, additional, Jansen, Anna C., additional, Hasaerts, Daniele, additional, Dielman, Charlotte, additional, de Bellescize, Julitta, additional, Boutry-Kryza, Nadia, additional, Lesca, Gaetan, additional, Spiczak, Sarah Von, additional, Helbig, Ingo, additional, Gill, Deepak, additional, Yendle, Simone, additional, Møller, Rikke S., additional, Klitten, Laura, additional, Korff, Christian, additional, Godfraind, Catherine, additional, Van Rijckevorsel, Kenou, additional, De Jonghe, Peter, additional, Hjalgrim, Helle, additional, Scheffer, Ingrid E., additional, and Suls, Arvid, additional

Published
2013
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32. Mutations inSYNGAP1Cause Intellectual Disability, Autism, and a Specific Form of Epilepsy by Inducing Haploinsufficiency

Author

Berryer, Martin H., primary, Hamdan, Fadi F., additional, Klitten, Laura L., additional, Møller, Rikke S., additional, Carmant, Lionel, additional, Schwartzentruber, Jeremy, additional, Patry, Lysanne, additional, Dobrzeniecka, Sylvia, additional, Rochefort, Daniel, additional, Neugnot-Cerioli, Mathilde, additional, Lacaille, Jean-Claude, additional, Niu, Zhiyv, additional, Eng, Christine M., additional, Yang, Yaping, additional, Palardy, Sylvain, additional, Belhumeur, Céline, additional, Rouleau, Guy A., additional, Tommerup, Niels, additional, Immken, LaDonna, additional, Beauchamp, Miriam H., additional, Patel, Gayle Simpson, additional, Majewski, Jacek, additional, Tarnopolsky, Mark A., additional, Scheffzek, Klaus, additional, Hjalgrim, Helle, additional, Michaud, Jacques L., additional, and Di Cristo, Graziella, additional

Published
2012
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35. Atypical Vitamin B6 Deficiency: A Rare Cause of Unexplained Neonatal and Infantile Epilepsies.

Author

Baumgart, Anna, Spiczak, Sarah von, Verhoeven-Duif, Nanda M., Møller, Rikke S., Boor, Rainer, Muhle, Hiltrud, Jähn, Johanna A., Klitten, Laura L., Hjalgrim, Helle, Lindhout, Dick, Stephani, Ulrich, van Kempen, Marjan J. A., and Helbig, Ingo

Subjects
CHILDHOOD epilepsy, VITAMIN B6 deficiency, PERINATAL death, EPILEPSY risk factors, HEPATIC encephalopathy, THERAPEUTICS
Abstract

ALDH7A1 and PNPO deficiencies are rare inborn errors of vitamin B6 metabolism causing perinatal seizure disorders. The phenotypic variability, however, is broad. To assess the frequency of these deficiencies in unexplained infantile epilepsy, we screened 113 patients for mutations in both genes. We identified 1 patient with an epilepsy phenotype resembling Dravet syndrome and likely pathogenic mutations in ALDH7A1. Presenting features were highly atypical of pyridoxine-dependent epilepsy, including febrile seizures, response to anticonvulsive drugs, and periods of seizure freedom without pyridoxine treatment. “Hidden” vitamin B6 deficiencies might be rare but treatable causes of unexplained epilepsy extending beyond the classical phenotypes. [ABSTRACT FROM PUBLISHER]

Published
2014
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36. Exon-disrupting deletions of NRXN1 in idiopathic generalized epilepsy.

Author

Møller, Rikke S., Weber, Yvonne G., Klitten, Laura L., Trucks, Holger, Muhle, Hiltrud, Kunz, Wolfram S., Mefford, Heather C., Franke, Andre, Kautza, Monika, Wolf, Peter, Dennig, Dieter, Schreiber, Stefan, Rückert, Ina‐Maria, Wichmann, H.‐Erich, Ernst, Jan P., Schurmann, Claudia, Grabe, Hans J., Tommerup, Niels, Stephani, Ulrich, and Lerche, Holger

Subjects
EXONS (Genetics), EPILEPSY, NEUREXINS, CELL adhesion molecules, PRESYNAPTIC receptors, NEURAL transmission, GENETIC mutation
Abstract

Purpose Neurexins are neuronal adhesion molecules located in the presynaptic terminal, where they interact with postsynaptic neuroligins to form a transsynaptic complex required for efficient neurotransmission in the brain. Recently, deletions and point mutations of the neurexin 1 ( NRXN1) gene have been associated with a broad spectrum of neuropsychiatric disorders. This study aimed to investigate if NRXN1 deletions also increase the risk of idiopathic generalized epilepsies ( IGEs). Methods We screened for deletions involving the NRXN1 gene in 1,569 patients with IGE and 6,201 controls using high-density oligonucleotide microarrays. Key Findings We identified exon-disrupting deletions of NRXN1 in 5 of 1,569 patients with IGE and 2 of 6,201 control individuals (p = 0.0049; odds ratio ( OR) 9.91, 95% confidence interval ( CI) 1.92-51.12). A complex familial segregation pattern in the IGE families was observed, suggesting that heterozygous NRXN1 deletions are susceptibility variants. Intriguingly, we identified a second large copy number variant in three of five index patients, supporting an involvement of heterogeneous susceptibility alleles in the etiology of IGE. Significance We conclude that exon-disrupting deletions of NRXN1 represent a genetic risk factor in the genetically complex predisposition of common IGE syndromes. [ABSTRACT FROM AUTHOR]

Published
2013
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37. Mutations in NRXN1in a family multiply affected with brain disorders: NRXN1mutations and brain disorders

Author

Duong, Linh, Klitten, Laura L., Møller, Rikke S., Ingason, Andrés, Jakobsen, Klaus D., Skjødt, Celina, Didriksen, Michael, Hjalgrim, Helle, Werge, Thomas, and Tommerup, Niels

Abstract

Mutation of the neurexin1‐gene, NRXN1, interrupting the expression of neurexin1 has been associated with schizophrenia, autism, and intellectual disability. We have identified a family multiply affected with psychiatric, neurological, and somatic disorders along with an intricate co‐segregation of NRXN1mutations. The proband suffered from autism, mental retardation, and epilepsy and on genotyping it was revealed that he carried a compound heterozygous mutation in the NRXN1consisting of a 451 kb deletion, affecting the promoter and first introns in addition to a point mutation, predicted to be deleterious to NRXN1. The deletion was passed on from the patient's mother who was clinically characterized by sub‐diagnostic autistic traits in addition to type 1 diabetes mellitus. The point mutation was subsequently found in the patient's brother, suffering from a psychotic disorder, which implies that the point mutation was inherited from the deceased father, who was diagnosed with schizophrenia. The observations suggest a possible gene‐dose effect of NRXN1mutations on type and severity of mental illness and support the notion that the penetrance and pleiotropy of pathogenic CNVs in general are determined by additional genetic variants in the genome. Finally the findings also propose a linkage of NRXN1neurobiology to epilepsy and possibly to type 1 diabetes. © 2012 Wiley Periodicals, Inc.

Published
2012
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38. 16p11.2 600 kb Duplications confer risk for typical and atypical Rolandic epilepsy

Author

Reinthaler, Eva M., Lal, Dennis, Lebon, Sebastien, Hildebrand, Michael S., Dahl, Hans-Henrik M., Regan, Brigid M., Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Ronen, Gabriel M., Roche, Laurian, Gruber-Sedlmayr, Ursula, Geldner, Julia, Haberlandt, Edda, Hoffmann, Per, Herms, Stefan, Gieger, Christian, Waldenberger, Melanie, Franke, Andre, Wittig, Michael, Schoch, Susanne, Becker, Albert J., Hahn, Andreas, Männik, Katrin, Toliat, Mohammad R., Winterer, Georg, Lerche, Holger, Nürnberg, Peter, Mefford, Heather, Scheffer, Ingrid E., Berkovic, Samuel F., Beckmann, Jacques S., Sander, Thomas, Jacquemont, Sebastien, Reymond, Alexandre, Zimprich, Fritz, Neubauer, Bernd A., Neubauer, Bernd, Mörzinger, Martina, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Helbig, Ingo, Muhle, Hiltrud, Ostertag, Philipp, von Spiczak, Sarah, Stephani, Ulrich, Trucks, Holger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Rosenow, Felix, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Becker, Felicitas, Weber, Yvonne, Koeleman, Bobby P.C., de Kovel, Carolien, Lindhout, Dick, Ameil, Agnès, Andrieux, Joris, Bouquillon, Sonia, Boute, Odile, de Flandre, Jeanne, Cuisset, Jean Marie, Cuvellier, Jean-Christophe, Salengro, Roger, David, Albert, de Vries, Bert, Delrue, Marie-Ange, Doco-Fenzy, Martine, Fernandez, Bridget A., Heron, Delphine, Keren, Boris, Lebel, Robert, Leheup, Bruno, Lewis, Suzanne, Mencarelli, Maria Antonietta, Mignot, Cyril, Minet, Jean-Claude, Moerman, Alexandre, Morice-Picard, Fanny, Mucciolo, Mafalda, Ounap, Katrin, Pasquier, Laurent, Petit, Florence, Ragona, Francesca, Rajcan-Separovic, Evica, Renieri, Alessandra, Rieubland, Claudine, Sanlaville, Damien, Sarrazin, Elisabeth, Shen, Yiping, van Haelst, Mieke, Silfhout, Anneke Vulto-van, Reinthaler, Eva M., Lal, Dennis, Lebon, Sebastien, Hildebrand, Michael S., Dahl, Hans-Henrik M., Regan, Brigid M., Feucht, Martha, Steinböck, Hannelore, Neophytou, Birgit, Ronen, Gabriel M., Roche, Laurian, Gruber-Sedlmayr, Ursula, Geldner, Julia, Haberlandt, Edda, Hoffmann, Per, Herms, Stefan, Gieger, Christian, Waldenberger, Melanie, Franke, Andre, Wittig, Michael, Schoch, Susanne, Becker, Albert J., Hahn, Andreas, Männik, Katrin, Toliat, Mohammad R., Winterer, Georg, Lerche, Holger, Nürnberg, Peter, Mefford, Heather, Scheffer, Ingrid E., Berkovic, Samuel F., Beckmann, Jacques S., Sander, Thomas, Jacquemont, Sebastien, Reymond, Alexandre, Zimprich, Fritz, Neubauer, Bernd A., Neubauer, Bernd, Mörzinger, Martina, Suls, Arvid, Weckhuysen, Sarah, Claes, Lieve, Deprez, Liesbet, Smets, Katrien, Van Dyck, Tine, Deconinck, Tine, De Jonghe, Peter, Møller, Rikke S., Klitten, Laura L., Hjalgrim, Helle, Campus, Kiel, Helbig, Ingo, Muhle, Hiltrud, Ostertag, Philipp, von Spiczak, Sarah, Stephani, Ulrich, Trucks, Holger, Elger, Christian E., Kleefuß-Lie, Ailing A., Kunz, Wolfram S., Surges, Rainer, Gaus, Verena, Janz, Dieter, Schmitz, Bettina, Rosenow, Felix, Klein, Karl Martin, Reif, Philipp S., Oertel, Wolfgang H., Hamer, Hajo M., Becker, Felicitas, Weber, Yvonne, Koeleman, Bobby P.C., de Kovel, Carolien, Lindhout, Dick, Ameil, Agnès, Andrieux, Joris, Bouquillon, Sonia, Boute, Odile, de Flandre, Jeanne, Cuisset, Jean Marie, Cuvellier, Jean-Christophe, Salengro, Roger, David, Albert, de Vries, Bert, Delrue, Marie-Ange, Doco-Fenzy, Martine, Fernandez, Bridget A., Heron, Delphine, Keren, Boris, Lebel, Robert, Leheup, Bruno, Lewis, Suzanne, Mencarelli, Maria Antonietta, Mignot, Cyril, Minet, Jean-Claude, Moerman, Alexandre, Morice-Picard, Fanny, Mucciolo, Mafalda, Ounap, Katrin, Pasquier, Laurent, Petit, Florence, Ragona, Francesca, Rajcan-Separovic, Evica, Renieri, Alessandra, Rieubland, Claudine, Sanlaville, Damien, Sarrazin, Elisabeth, Shen, Yiping, van Haelst, Mieke, and Silfhout, Anneke Vulto-van

Abstract

Rolandic epilepsy (RE) is the most common idiopathic focal childhood epilepsy. Its molecular basis is largely unknown and a complex genetic etiology is assumed in the majority of affected individuals. The present study tested whether six large recurrent copy number variants at 1q21, 15q11.2, 15q13.3, 16p11.2, 16p13.11 and 22q11.2 previously associated with neurodevelopmental disorders also increase risk of RE. Our association analyses revealed a significant excess of the 600 kb genomic duplication at the 16p11.2 locus (chr16: 29.5-30.1 Mb) in 393 unrelated patients with typical (n = 339) and atypical (ARE; n = 54) RE compared with the prevalence in 65 046 European population controls (5/393 cases versus 32/65 046 controls; Fisher's exact test P = 2.83 × 10−6, odds ratio = 26.2, 95% confidence interval: 7.9-68.2). In contrast, the 16p11.2 duplication was not detected in 1738 European epilepsy patients with either temporal lobe epilepsy (n = 330) and genetic generalized epilepsies (n = 1408), suggesting a selective enrichment of the 16p11.2 duplication in idiopathic focal childhood epilepsies (Fisher's exact test P = 2.1 × 10−4). In a subsequent screen among children carrying the 16p11.2 600 kb rearrangement we identified three patients with RE-spectrum epilepsies in 117 duplication carriers (2.6%) but none in 202 carriers of the reciprocal deletion. Our results suggest that the 16p11.2 duplication represents a significant genetic risk factor for typical and atypical RE

39. Duplication of MAOA, MAOB, and NDP in a patient with mental retardation and epilepsy.

Author

Klitten, Laura L., Møller, Rikke S., Ravn, Kirstine, Hjalgrim, Helle, and Tommerup, Niels

Subjects
*GENES, *INTELLECTUAL disabilities, *POLYMERASE chain reaction, *MONOAMINE oxidase, *EPILEPSY, *MEDICAL screening
Abstract

The article reports on the case of mentally retarded and epileptic male patient which carries duplication of monoamine oxidase B (MAOB), monoamine oxidase A (MAOA), and NDP genes. It says that 16 copy number variants (CNVs) of minimum 100 kb were identified in the patient. The real-time quantitative polymerase chain reaction (qPCR) was used to validate the duplication of MAOB, MAOA, and NDP genes. Moreover, clinical examination at the age of 32 revealed moderate-to-severe mental retardation.

Published
2011
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