Feger C

References (2)

Title : Novel mutations in NLGN3 causing autism spectrum disorder and cognitive impairment - Quartier_2019_Hum.Mutat_40_2021
Author(s) : Quartier A , Courraud J , Thi Ha T , McGillivray G , Isidor B , Rose K , Drouot N , Savidan MA , Feger C , Jagline H , Chelly J , Shaw M , Laumonnier F , Gecz J , Mandel JL , Piton A
Ref : Hum Mutat , 40 :2021 , 2019
Abstract : The X-linked NLGN3 gene, encoding a postsynaptic cell adhesion molecule, was involved in a nonsyndromic monogenic form of autism spectrum disorder (ASD) by the description of one unique missense variant, p.Arg451Cys (Jamain et al. 2003). We investigated here the pathogenicity of additional missense variants identified in two multiplex families with intellectual disability (ID) and ASD: c.1789C>T, p.Arg597Trp, previously reported by our group (Redin et al. 2014) and present in three affected cousins and c.1540C>T, p.Pro514Ser, identified in two affected brothers. Overexpression experiments in HEK293 and HeLa cell lines revealed that both variants affect the level of the mature NLGN3 protein, its localization at the plasma membrane and its presence as a cleaved form in the extracellular environment, even more drastically than what was reported for the initial p.Arg451Cys mutation. The variants also induced an unfolded protein response, probably due to the retention of immature NLGN3 proteins in the endoplasmic reticulum. In comparison, the c.1894A>G, p.Ala632Thr and c.1022T>C, p.Val341Ala variants, present in males from the general population, have no effect. Our report of two missense variants affecting the normal localization of NLGN3 in a total of five affected individuals reinforces the involvement of the NLGN3 gene in a neurodevelopmental disorder characterized by ID and ASD.
ESTHER : Quartier_2019_Hum.Mutat_40_2021
PubMedSearch : Quartier_2019_Hum.Mutat_40_2021
PubMedID: 31184401
Gene_locus related to this paper: human-NLGN3

Title : Efficient strategy for the molecular diagnosis of intellectual disability using targeted high-throughput sequencing - Redin_2014_J.Med.Genet_51_724
Author(s) : Redin C , Gerard B , Lauer J , Herenger Y , Muller J , Quartier A , Masurel-Paulet A , Willems M , Lesca G , El-Chehadeh S , Le Gras S , Vicaire S , Philipps M , Dumas M , Geoffroy V , Feger C , Haumesser N , Alembik Y , Barth M , Bonneau D , Colin E , Dollfus H , Doray B , Delrue MA , Drouin-Garraud V , Flori E , Fradin M , Francannet C , Goldenberg A , Lumbroso S , Mathieu-Dramard M , Martin-Coignard D , Lacombe D , Morin G , Polge A , Sukno S , Thauvin-Robinet C , Thevenon J , Doco-Fenzy M , Genevieve D , Sarda P , Edery P , Isidor B , Jost B , Olivier-Faivre L , Mandel JL , Piton A
Ref : Journal of Medical Genetics , 51 :724 , 2014
Abstract : BACKGROUND: Intellectual disability (ID) is characterised by an extreme genetic heterogeneity. Several hundred genes have been associated to monogenic forms of ID, considerably complicating molecular diagnostics. Trio-exome sequencing was recently proposed as a diagnostic approach, yet remains costly for a general implementation. METHODS: We report the alternative strategy of targeted high-throughput sequencing of 217 genes in which mutations had been reported in patients with ID or autism as the major clinical concern. We analysed 106 patients with ID of unknown aetiology following array-CGH analysis and other genetic investigations. Ninety per cent of these patients were males, and 75% sporadic cases. RESULTS: We identified 26 causative mutations: 16 in X-linked genes (ATRX, CUL4B, DMD, FMR1, HCFC1, IL1RAPL1, IQSEC2, KDM5C, MAOA, MECP2, SLC9A6, SLC16A2, PHF8) and 10 de novo in autosomal-dominant genes (DYRK1A, GRIN1, MED13L, TCF4, RAI1, SHANK3, SLC2A1, SYNGAP1). We also detected four possibly causative mutations (eg, in NLGN3) requiring further investigations. We present detailed reasoning for assigning causality for each mutation, and associated patients' clinical information. Some genes were hit more than once in our cohort, suggesting they correspond to more frequent ID-associated conditions (KDM5C, MECP2, DYRK1A, TCF4). We highlight some unexpected genotype to phenotype correlations, with causative mutations being identified in genes associated to defined syndromes in patients deviating from the classic phenotype (DMD, TCF4, MECP2). We also bring additional supportive (HCFC1, MED13L) or unsupportive (SHROOM4, SRPX2) evidences for the implication of previous candidate genes or mutations in cognitive disorders. CONCLUSIONS: With a diagnostic yield of 25% targeted sequencing appears relevant as a first intention test for the diagnosis of ID, but importantly will also contribute to a better understanding regarding the specific contribution of the many genes implicated in ID and autism.
ESTHER : Redin_2014_J.Med.Genet_51_724
PubMedSearch : Redin_2014_J.Med.Genet_51_724
PubMedID: 25167861
Gene_locus related to this paper: human-NLGN3