Nomenclature: γ

Family: Nicotinic acetylcholine receptors

Annotation status:  image of a green circle Annotated and expert reviewed. Please contact us if you can help with updates. 


Gene and Protein Information
Species TM AA Chromosomal Location Gene Symbol Gene Name Reference
Human 4 517 2q33-q34 CHRNG cholinergic receptor, nicotinic, gamma (muscle) 6
Mouse 4 519 1 D Chrng cholinergic receptor, nicotinic, gamma polypeptide 2
Rat 4 519 9q35 Chrng cholinergic receptor, nicotinic, gamma (muscle) 8
Previous and Unofficial Names
cholinergic receptor, nicotinic, gamma
acetylcholine receptor, nicotinic, gamma (muscle)
AChR gamma subunit
acetylcholine receptor subunit gamma
cholinergic receptor, nicotinic, gamma polypeptide
Database Links
ChEMBL Target
Ensembl Gene
Entrez Gene
GenitoUrinary Development Molecular Anatomy Project
Human Protein Reference Database
Orphanet Gene
PharmGKB Gene
Protein Ontology (PRO)
RefSeq Nucleotide
RefSeq Protein
UniGene Hs.
Natural/Endogenous Ligands
Tissue Distribution Comments
The γ-subunit mRNA is expressed in embryonic skeletal muscle of vertebrates. In postnatal animals, expression of the γ-subunit is replaced by the ε-subunit.
Physiological Consequences of Altering Gene Expression
Homozygous mice, if born alive, survive for two days. Mice have abnormal neuromuscular synapses and lack spontaneous neuromuscular action potentials generated from minature end-plate potentials.
Species:  Mouse
Tissue:  in vivo
Technique:  Gene knockout
References:  7
Mice with an ε-subunit null mutation associated with the human AChR deficiency syndrome die between 10 and 14 weeks after birth. However, mice with the ε null mutation but which also consitutively express the human γ-subunit survive into adult life.
Species:  Mouse
Tissue:  in vivo
Technique:  Knock-in
References:  1
Clinically-Relevant Mutations and Pathophysiology
Disease:  Escobar syndrome
OMIM:  265000
Orphanet:  2990
References:  3
Click column headers to sort
Type Species Molecular location Description Reference
Frameshift Human multiple 3
Missense Human multiple 3
Disease:  Fetal akinesia deformation sequence disorders
OMIM:  100730
References:  4
Click column headers to sort
Type Species Molecular location Description Reference
Missense Human multiple 4
Disease:  Multiple pterygium syndrome
OMIM:  253290
Orphanet:  33108
References:  5
Click column headers to sort
Type Species Molecular location Description Reference
Frameshift Human multiple 5
Missense Human multiple 5


1. Cossins J, Webster R, Maxwell S, Burke G, Vincent A, Beeson D. (2004) A mouse model of AChR deficiency syndrome with a phenotype reflecting the human condition. Hum. Mol. Genet.13 (23): 2947-57. [PMID:15471888]

2. Eng CM, Kozak CA, Beaudet AL, Zoghbi HY. (1991) Mapping of multiple subunits of the neuronal nicotinic acetylcholine receptor to chromosome 15 in man and chromosome 9 in mouse. Genomics9 (2): 278-82. [PMID:2004777]

3. Hoffmann K, Muller JS, Stricker S, Megarbane A, Rajab A, Lindner TH, Cohen M, Chouery E, Adaimy L, Ghanem I et al.. (2006) Escobar syndrome is a prenatal myasthenia caused by disruption of the acetylcholine receptor fetal gamma subunit. Am. J. Hum. Genet.79 (2): 303-12. [PMID:16826520]

4. Michalk A, Stricker S, Becker J, Rupps R, Pantzar T, Miertus J, Botta G, Naretto VG, Janetzki C, Yaqoob N et al.. (2008) Acetylcholine receptor pathway mutations explain various fetal akinesia deformation sequence disorders. Am. J. Hum. Genet.82 (2): 464-76. [PMID:18252226]

5. Morgan NV, Brueton LA, Cox P, Greally MT, Tolmie J, Pasha S, Aligianis IA, van Bokhoven H, Marton T, Al-Gazali L et al.. (2006) Mutations in the embryonal subunit of the acetylcholine receptor (CHRNG) cause lethal and Escobar variants of multiple pterygium syndrome. Am. J. Hum. Genet.79 (2): 390-5. [PMID:16826531]

6. Shibahara S, Kubo T, Perski HJ, Takahashi H, Noda M, Numa S. (1985) Cloning and sequence analysis of human genomic DNA encoding gamma subunit precursor of muscle acetylcholine receptor. Eur. J. Biochem.146 (1): 15-22. [PMID:3967651]

7. Takahashi M, Kubo T, Mizoguchi A, Carlson CG, Endo K, Ohnishi K. (2002) Spontaneous muscle action potentials fail to develop without fetal-type acetylcholine receptors. EMBO Rep.3 (7): 674-81. [PMID:12101101]

8. Witzemann V, Stein E, Barg B, Konno T, Koenen M, Kues W, Criado M, Hofmann M, Sakmann B. (1990) Primary structure and functional expression of the alpha-, beta-, gamma-, delta- and epsilon-subunits of the acetylcholine receptor from rat muscle. Eur. J. Biochem.194 (2): 437-48. [PMID:1702709]

To cite this database page, please use the following:

Cecilia Gotti, Michael. J. Marks, Neil S. Millar, Susan Wonnacott.
Nicotinic acetylcholine receptors: γ. Last modified on 14/03/2014. Accessed on 23/10/2014. IUPHAR database (IUPHAR-DB),

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