Gamma-aminobutyric acid receptor subunit gamma-1 (GABRG1)

The Gamma-aminobutyric acid receptor subunit gamma-1 (GABRG1) is one of the 19 different subunits that can assemble to form GABAA receptors, which are heteropentameric ligand-gated chloride channels[1][5]. GABAA receptors containing the gamma-1 subunit are expressed in only a few areas of the brain, making them interesting and potentially selective drug targets[6]. GABAA receptors typically consist of five subunits arranged around a central pore, with the most common composition being two α subunits, two β subunits, and one γ subunit[1][3]. The gamma-1 subunit, when incorporated into a GABAA receptor, influences the receptor's pharmacological properties, particularly its response to various drugs such as benzodiazepines[6]. Studies have shown that GABAA receptors composed of α1, β2, and γ1 subunits have distinct pharmacological profiles compared to receptors containing other gamma subunits (like the more common γ2)[6]. This specificity could potentially be exploited for the development of drugs with fewer side effects due to their selective targeting of specific GABAA receptor subtypes. The GABRG1 gene is located on chromosome 4 in humans, as part of a cluster that also includes the α2, α4, and β1 subunit genes[1]. The protein contains the characteristic features of GABAA receptor subunits, including an extracellular N-terminal domain with a Cys-loop, four transmembrane domains, and a large intracellular loop between the third and fourth transmembrane domains[4]. Pharmacologically, the gamma-1 subunit contributes to the binding sites for various modulatory drugs, particularly benzodiazepines, though with different affinities compared to the more common gamma-2 subunit-containing receptors[6]. This differential pharmacology makes gamma-1-containing GABAA receptors potential targets for the development of subtype-selective drugs with improved therapeutic profiles.

Other names

GABA(A) receptor gamma-1 subunitGABAA receptor gamma-1 subunitγ1 subunit

Forms part of the chloride ion channel that is gated by GABA; Contributes to the binding site for various modulatory drugs; Modulates the efficacy and potency of GABA-induced chloride currents