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

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

Am J Hum Genet 2017 Nov;101(5):664-685

Centre Hospitalier Universitaire Sainte-Justine Research Center, Montreal, QC H3T1C5, Canada; Department of Neurosciences, Université de Montréal, Montreal, QC H3T1J4, Canada; Department of Pediatrics, Université de Montréal, Montreal, QC H3T1C5, Canada. Electronic address:

Developmental and epileptic encephalopathy (DEE) is a group of conditions characterized by the co-occurrence of epilepsy and intellectual disability (ID), typically with developmental plateauing or regression associated with frequent epileptiform activity. The cause of DEE remains unknown in the majority of cases. We performed whole-genome sequencing (WGS) in 197 individuals with unexplained DEE and pharmaco-resistant seizures and in their unaffected parents. We focused our attention on de novo mutations (DNMs) and identified candidate genes containing such variants. We sought to identify additional subjects with DNMs in these genes by performing targeted sequencing in another series of individuals with DEE and by mining various sequencing datasets. We also performed meta-analyses to document enrichment of DNMs in candidate genes by leveraging our WGS dataset with those of several DEE and ID series. By combining these strategies, we were able to provide a causal link between DEE and the following genes: NTRK2, GABRB2, CLTC, DHDDS, NUS1, RAB11A, GABBR2, and SNAP25. Overall, we established a molecular diagnosis in 63/197 (32%) individuals in our WGS series. The main cause of DEE in these individuals was de novo point mutations (53/63 solved cases), followed by inherited mutations (6/63 solved cases) and de novo CNVs (4/63 solved cases). De novo missense variants explained a larger proportion of individuals in our series than in other series that were primarily ascertained because of ID. Moreover, these DNMs were more frequently recurrent than those identified in ID series. These observations indicate that the genetic landscape of DEE might be different from that of ID without epilepsy.

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http://dx.doi.org/10.1016/j.ajhg.2017.09.008DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5673604PMC
November 2017
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