The cluster of three GABAA receptor subunit genes (GABRB3, GABRA5, and GABRG3 which encode the receptor subunits β3, α5, and γ3, respectively) is of particular importance for neurodevelopmental disorders with epilepsy and autism because of GABA (Gamma amino-butiric acid) being the main inhibitory neurotransmitter in the brain [13]. This evidence concerns the gene GABRB3 and neurodevelopmental disorder.