Acetylcholine receptor subunit gamma (CHRNG)

The acetylcholine receptor subunit gamma (CHRNG) is a protein encoded in humans by the CHRNG gene. It forms one of five subunits of the muscle-type nicotinic acetylcholine receptor (nAChR), a pentameric ligand-gated ion channel essential for nerve-muscle communication and muscle contraction. The gamma subunit is expressed predominantly during fetal development; in adults, it is replaced by the epsilon subunit. CHRNG is crucial for neuromuscular synapse formation and proper localization of the receptor in developing muscle cells. Defects or mutations in the CHRNG gene disrupt receptor assembly and function, leading to congenital disorders such as multiple pterygium syndrome (Escobar syndrome) and, in severe cases, fetal akinesia and lethality. The nAChR gamma subunit mediates agonist binding and cation channel gating, and is targeted by several agonists and antagonists, with testing available for its associated congenital diseases[1][5][7][9].

Other names

cholinergic receptor nicotinic gamma subunitAcetylcholine receptor, nicotinic, gamma (muscle)Acetylcholine receptor subunit gammaACHRGacetylcholine gamma muscle receptor subunitcholinergic gamma nicotinic receptorcholinergic receptor, nicotinic gammacholinergic receptor, nicotinic, gamma polypeptide

Agonists bind to the extracellular domain and transiently open the channel, allowing cation flux and muscle depolarization / contraction[2][8] Antagonists block channel opening or ligand binding, preventing nerve-to-muscle signaling[8] Structure changes in the gamma subunit affect receptor gating and function during fetal development[1][6]