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Krochmalnek E, Accogli A, St-Onge J, Addour-Boudrahem N, Prakash G, Kim SH, Brunette-Clement T, Alhajaj G, Mougharbel L, Bruneau E, Myers KA, Dubeau F, Karamchandani J, Farmer JP, Atkinson J, Hall J, Chantal Poulin C, Rosenblatt B, Lafond-Lapalme J, Weil A, Fallet-Bianco C, Albrecht S, Sonenberg N, Riviere JB, Dudley RW, Srour M. mTOR Pathway Somatic Pathogenic Variants in Focal Malformations of Cortical Development: Novel Variants, Topographic Mapping, and Clinical Outcomes. Neurol Genet 2023; 9:e200103. [PMID: 37900581 PMCID: PMC10602370 DOI: 10.1212/nxg.0000000000200103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 09/06/2023] [Indexed: 10/31/2023]
Abstract
Background and Objectives Somatic and germline pathogenic variants in genes of the mammalian target of rapamycin (mTOR) signaling pathway are a common mechanism underlying a subset of focal malformations of cortical development (FMCDs) referred to as mTORopathies, which include focal cortical dysplasia (FCD) type II, subtypes of polymicrogyria, and hemimegalencephaly. Our objective is to screen resected FMCD specimens with mTORopathy features on histology for causal somatic variants in mTOR pathway genes, describe novel pathogenic variants, and examine the variant distribution in relation to neuroimaging, histopathologic classification, and clinical outcomes. Methods We performed ultra-deep sequencing using a custom HaloPlexHS Target Enrichment kit in DNA from 21 resected fresh-frozen histologically confirmed FCD type II, tuberous sclerosis complex, or hemimegalencephaly specimens. We mapped the variant alternative allele frequency (AAF) across the resected brain using targeted ultra-deep sequencing in multiple formalin-fixed paraffin-embedded tissue blocks. We also functionally validated 2 candidate somatic MTOR variants and performed targeted RNA sequencing to validate a splicing defect associated with a novel DEPDC5 variant. Results We identified causal mTOR pathway gene variants in 66.7% (14/21) of patients, of which 13 were somatic with AAF ranging between 0.6% and 12.0%. Moreover, the AAF did not predict balloon cell presence. Favorable seizure outcomes were associated with genetically clear resection borders. Individuals in whom a causal somatic variant was undetected had excellent postsurgical outcomes. In addition, we demonstrate pathogenicity of the novel c.4373_4375dupATG and candidate c.7499T>A MTOR variants in vitro. We also identified a novel germline aberrant splice site variant in DEPDC5 (c.2802-1G>C). Discussion The AAF of somatic pathogenic variants correlated with the topographic distribution, histopathology, and postsurgical outcomes. Moreover, cortical regions with absent histologic FCD features had negligible or undetectable pathogenic variant loads. By contrast, specimens with frank histologic abnormalities had detectable pathogenic variant loads, which raises important questions as to whether there is a tolerable variant threshold and whether surgical margins should be clean, as performed in tumor resections. In addition, we describe 2 novel pathogenic variants, expanding the mTORopathy genetic spectrum. Although most pathogenic somatic variants are located at mutation hotspots, screening the full-coding gene sequence remains necessary in a subset of patients.
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Affiliation(s)
- Eric Krochmalnek
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Andrea Accogli
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Judith St-Onge
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Nassima Addour-Boudrahem
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Gyan Prakash
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Sung-Hoon Kim
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Tristan Brunette-Clement
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Ghadd Alhajaj
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Lina Mougharbel
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Elena Bruneau
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Kenneth A Myers
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Francois Dubeau
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Jason Karamchandani
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Jean-Pierre Farmer
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Jeffrey Atkinson
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Jeffrey Hall
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Chantal Chantal Poulin
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Bernard Rosenblatt
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Joel Lafond-Lapalme
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Alexander Weil
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Catherine Fallet-Bianco
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Steffen Albrecht
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Nahum Sonenberg
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Jean-Baptiste Riviere
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Roy W Dudley
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
| | - Myriam Srour
- From the Research Institute of the McGill University Health Centre (E.K., J.S.-O., N.A.-B., L.M., E.B., K.A.M., J.L.-L., J.-B.R., R.W.D., M.S.); Integrated Program in Neuroscience (E.K.), McGill University; Department of Specialized Medicine (A.A.), McGill University Health Centre; Department of Human Genetics (A.A., J.-B.R.), Faculty of Medicine; Goodman Cancer Centre (G.P., S.-H.K., N.S.), Department of Biochemistry, McGill University; Department of Pediatric Neurosurgery (T.B.-C., A.W.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal; Division of Pediatric Neurology (G.A., K.A.M., C.C.P., M.S.), Department of Pediatrics, McGill University, Montreal, Quebec, Canada; Department of Pediatrics (G.A.), Unaizah College of Medicine and Medical Sciences, Qassim University, Saudi Arabia; Department of Neurology and Neurosurgery (K.A.M., F.D., J.H., C.C.P., M.S.), McGill University Health Centre; Department of Pathology (J.K., S.A.), McGill University; Division of Neurosurgery (J.-P.F., J.A., R.W.D.), Department of Pediatric Surgery, McGill University Health Center; McGill University (B.R.); Department of Pathology (C.F.-B.), Centre Hospitalier Universitaire Sainte-Justine, University of Montreal, Quebec, Canada
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