Gamma-aminobutyric acid type A receptor alpha-6 beta-2 gamma-2 subtype (GABA-A receptor α6β2γ2)

The GABA-A receptor α6β2γ2 subtype is a heteropentameric ligand-gated ion channel that mediates inhibitory neurotransmission in the central nervous system [1, 8]. It is primarily expressed in the granule cells of the cerebellum, where it plays a specialized role in regulating motor coordination and sensory input [2, 15]. Unlike many other GABA-A receptor subtypes, the α6-containing variant is "diazepam-insensitive" due to a specific arginine residue in the α6 subunit that prevents the binding of classical benzodiazepines [4, 15]. This receptor subtype contributes significantly to tonic inhibition, providing a continuous inhibitory tone that modulates neuronal excitability [1, 12]. Dysregulation of α6β2γ2 receptors has been linked to conditions such as tinnitus, essential tremor, and neuropsychiatric disorders like schizophrenia [1, 9]. Pharmacological targeting of this subtype with selective modulators like hispidulin or DK-I-56-1 is being explored for therapeutic potential in treating cerebellar-related motor deficits and sensory hypersensitivity [1, 2].

Other names

GABRA6-GABRB2-GABRG2 receptorα6β2γ2 GABA-A receptorDiazepam-insensitive GABA-A receptor (α6-containing)

Positive allosteric modulation, Negative allosteric modulation, Agonism [1, 2, 4]