Gamma-aminobutyric acid receptor subunit gamma-3 (GABRG3) (GABRG3)

The Gamma-aminobutyric acid receptor subunit gamma-3 (GABRG3) is an integral membrane protein that functions as a component of the heteropentameric GABA_A receptor, the major inhibitory neurotransmitter receptor in the mammalian brain (UniProt: Q99928). Encoded by a gene in the 15q11-q13 cluster, GABRG3 is essential for the assembly of functional ion channels that conduct chloride ions across the postsynaptic membrane in response to GABA binding (NCBI Gene: 2567). While the gamma-2 subunit is more prevalent, GABRG3 contributes to the pharmacological diversity of GABA_A receptors, particularly in the formation of benzodiazepine binding sites with distinct affinities (PubMed: 11511254). Genetic variations in GABRG3 have been significantly linked to the risk of alcohol dependence and are associated with autism spectrum disorders, suggesting a role in the modulation of inhibitory tone and neurodevelopment (PubMed: 15024690, PubMed: 12506128). Drugs interacting with receptors containing this subunit include benzodiazepines, barbiturates, and ethanol, which typically act as positive allosteric modulators to enhance inhibitory signaling. Consequently, GABRG3 represents a potential target for developing subtype-selective treatments for neuropsychiatric conditions while minimizing the side effects associated with non-selective GABAergic modulation.

Other names

GABRG3GABA(A) receptor subunit gamma-3Gamma-aminobutyric acid type A receptor subunit gamma-3GABA receptor subunit gamma-3

Positive allosteric modulation of the GABA-A receptor chloride channel, increasing the frequency or duration of channel opening in response to GABA (PubMed: 11511254).