GABRB3 and Angelman syndrome: Reduced GABRB3 expression has been postulated in the pathogenesis of absence seizures, abnormal sensory processing, and other neurodevelopmental disorder phenotypes such as Angelman syndrome, autism spectrum disorders, and intellectual disability.8, 9, 10 Furthermore, single nucleotide polymorphisms and missense mutations in GABRB3 have previously been implicated in childhood absence epilepsy.11, 12