학술논문
Expanding the phenotypic spectrum of GABRG2 variants: a recurrent GABRG2 missense variant associated with a severe phenotype
Document Type
article
Author
Zou, Fanggeng; McWalter, Kirsty; Schmidt, Lindsay; Decker, Amy; Picker, Jonathan D; Lincoln, Sharyn; Sweetser, David A; Briere, Lauren C; Harini, Chellamani; Network, Members of the Undiagnosed Diseases; Marsh, Eric; Medne, Livija; Wang, Raymond Y; Leydiker, Karen; Mower, Andrew; Visser, Gepke; Cuppen, Inge; van Gassen, Koen L; van der Smagt, Jasper; Yousaf, Adeel; Tennison, Michael; Shanmugham, Anita; Butler, Elizabeth; Richard, Gabriele; McKnight, Dianalee
Source
Journal of Neurogenetics. 31(1-2)
Subject
Language
Abstract
Pathogenic missense and truncating variants in the GABRG2 gene cause a spectrum of epilepsies, from Dravet syndrome to milder simple febrile seizures. In most cases, pathogenic missense variants in the GABRG2 gene segregate with a febrile seizure phenotype. In this case series, we report a recurrent, de novo missense variant (c0.316 G > A; p.A106T) in the GABRG2 gene that was identified in five unrelated individuals. These patients were described to have a more severe phenotype than previously reported for GABRG2 missense variants. Common features include variable early-onset seizures, significant motor and speech delays, intellectual disability, hypotonia, movement disorder, dysmorphic features and vision/ocular issues. Our report further explores a recurrent pathogenic missense variant within the GABRG2 variant family and broadens the spectrum of associated phenotypes for GABRG2-associated disorders.