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De novo mutations in epileptic encephalopathies

By Andrew S. Allen, Samuel F. Berkovic, Patrick Cossette, Norman Delanty, Dennis Dlugos, Evan E. Eichler, Michael P. Epstein, Tracy Glauser, David B. Goldstein, Yujun Han, Erin L. Heinzen, Yuki Hitomi, Katherine B. Howell, Michael R. Johnson, Ruben Kuzniecky, Daniel H. Lowenstein, Yi-Fan Lu, Maura R. Z. Madou, Anthony G. Marson, Heather C. Mefford, Sahar Esmaeeli Nieh, Terence J. O'Brien, Ruth Ottman, Slave Petrovski, Annapurna Poduri, Elizabeth K. Ruzzo, Ingrid E. Scheffer, Elliott H. Sherr, Christopher J. Yuskaitis, Bassel Abou-Khalil, Brian K. Alldredge, Jocelyn F. Bautista, Samuel F. Berkovic, Alex Boro, Gregory D. Cascino, Damian Consalvo, Patricia Crumrine, Orrin Devinsky, Dennis Dlugos, Michael P. Epstein, Miguel Fiol, Nathan B. Fountain, Jacqueline French, Daniel Friedman, Eric B. Geller, Tracy Glauser, Simon Glynn, Sheryl R. Haut, Jean Hayward, Sandra L. Helmers, Sucheta Joshi, Andres Kanner, Heidi E. Kirsch, Robert C. Knowlton, Erich Kossoff, Rachel Kuperman, Ruben Kuzniecky, Daniel H. Lowenstein, Shannon M. McGuire, Paul V. Motika, Edward J. Novotny, Ruth Ottman, Juliann M. Paolicchi, Jack M. Parent, Kristen Park, Annapurna Poduri, Ingrid E. Scheffer, Renee A. Shellhaas, Elliott H. Sherr, Jerry J. Shih, Rani Singh, Joseph Sirven, Michael C. Smith, Joseph Sullivan, Liu Lin Thio, Anu Venkat, Eileen P. G. Vining, Gretchen K. Von Allmen, Judith L. Weisenberg, Peter Widdess-Walsh and Melodie R. Winawer

Abstract

<p>Epileptic encephalopathies are a devastating group of severe childhood epilepsy disorders for which the cause is often unknown(1). Here we report a screen for de novo mutations in patients with two classical epileptic encephalopathies: infantile spasms (n = 149) and Lennox-Gastaut syndrome (n = 115). We sequenced the exomes of 264 probands, and their parents, and confirmed 329 de novo mutations. A likelihood analysis showed a significant excess of de novo mutations in the similar to 4,000 genes that are the most intolerant to functional genetic variation in the human population (P = 2.9 x 10(-3)). Among these are GABRB3, with de novo mutations in four patients, and ALG13, with the same de novo mutation in two patients; both genes show clear statistical evidence of association with epileptic encephalopathy. Given the relevant site-specific mutation rates, the probabilities of these outcomes occurring by chance are P = 4.1 x 10(-10) and P = 7.8 x 10(-12), respectively. Other genes with de novo mutations in this cohort include CACNA1A, CHD2, FLNA, GABRA1, GRIN1, GRIN2B, HNRNPU, IQSEC2, MTOR and NEDD4L. Finally, we show that the de novo mutations observed are enriched in specific gene sets including genes regulated by the fragile X protein (P <10(-8)), as has been reported previously for autism spectrum disorders(2).</p>

Topics: GENOME-WIDE ASSOCIATION, INTELLECTUAL DISABILITY; MENTAL-RETARDATION; EPILEPSIES; DISORDERS; AUTISM; SUSCEPTIBILITY; SPECTRUM; DISEASE; PROTEIN
Year: 2013
DOI identifier: 10.1038/nature12439
OAI identifier: oai:pure.rug.nl:publications/114f2e5f-477b-4656-9e2d-70eb6c835031
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