// Workers AI · dad joke modeWhat did CHRNA9 say to its friend? You're a receptor to my heart.

CHRNA9
Identifiers
Aliases	CHRNA9, HSA243342, NACHRA9, cholinergic receptor nicotinic alpha 9 subunit
External IDs	OMIM: 605116; MGI: 1202403; HomoloGene: 9729; GeneCards: CHRNA9; OMA:CHRNA9 - orthologs
Available structures PDB Human UniProt search: PDBe RCSB List of PDB id codes 4D01, 4UXU, 4UY2
Gene location (Human) Chr. Chromosome 4 (human) Band 4p14 Start 40,335,333 bp End 40,355,217 bp
Gene location (Mouse) Chr. Chromosome 5 (mouse) Band 5 C3.1|5 33.84 cM Start 66,092,264 bp End 66,134,669 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in testicle gonad human penis olfactory zone of nasal mucosa right uterine tube tibialis anterior muscle bronchial epithelial cell vulva skin of limb skin of leg Top expressed in otolith organ utricle thymus esophagus morula vestibular sensory epithelium embryo blastocyst spermatid temporal muscle More reference expression data BioGPS More reference expression data
Gene ontology Molecular function ion channel activity calcium channel activity extracellular ligand-gated ion channel activity ligand-gated ion channel activity acetylcholine-gated cation-selective channel activity protein binding transmembrane signaling receptor activity transmitter-gated ion channel activity involved in regulation of postsynaptic membrane potential Cellular component synapse integral component of membrane cell junction integral component of plasma membrane postsynaptic membrane membrane acetylcholine-gated channel complex plasma membrane cholinergic synapse integral component of postsynaptic specialization membrane neuron projection Biological process calcium ion transport detection of mechanical stimulus involved in sensory perception of sound positive regulation of cytosolic calcium ion concentration inner ear morphogenesis hearing ion transport calcium ion transmembrane transport cation transport regulation of postsynaptic membrane potential excitatory postsynaptic potential signal transduction ion transmembrane transport negative regulation of ERK1 and ERK2 cascade chemical synaptic transmission regulation of membrane potential nervous system process Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 55584 231252 Ensembl ENSG00000174343 ENSMUSG00000029205 UniProt Q9UGM1 n/a RefSeq (mRNA) NM_017581 NM_001081104 RefSeq (protein) NP_060051 n/a Location (UCSC) Chr 4: 40.34 – 40.36 Mb Chr 5: 66.09 – 66.13 Mb PubMed search
Wikidata
View/Edit Human View/Edit Mouse

Neuronal acetylcholine receptor subunit alpha-9, also known as nAChRα9, is a protein that in humans is encoded by the CHRNA9 gene. The protein encoded by this gene is a subunit of certain nicotinic acetylcholine receptors (nAchR).

α9 subunit-containing receptors are notably blocked by nicotine. The role of this antagonism in the effects of tobacco are unknown.

This gene is a member of the ligand-gated ionic channel family and nicotinic acetylcholine receptor gene superfamily. It encodes a plasma membrane protein that forms homo- or hetero-oligomeric divalent cation channels. This protein is involved in cochlea hair cell function and is expressed in both the inner and outer hair cells (OHCs) of the adult cochlea, although expression levels in adult inner hair cells is low. The activation of the alpha9/10 nAChR is via olivocochlear activity, represented by cholinergic efferent synaptic terminals originating from the superior olive region of the brainstem. The protein is additionally expressed in keratinocytes, the pituitary gland, B-cells and T-cells.

Selective block of α9α10 nicotinic acetylcholine receptors by the conotoxin RgIA has been shown to be analgesic in an animal model of nerve injury pain.

See also

• Nicotinic acetylcholine receptor

Further reading

• Nguyen VT, Ndoye A, Grando SA (2000). "Novel Human α9 Acetylcholine Receptor Regulating Keratinocyte Adhesion is Targeted by Pemphigus Vulgaris Autoimmunity". Am. J. Pathol. 157 (4): 1377–1391. doi:10.1016/S0002-9440(10)64651-2. PMC 1850172. PMID 11021840.
• Hartley JL, Temple GF, Brasch MA (2001). "DNA Cloning Using In Vitro Site-Specific Recombination". Genome Res. 10 (11): 1788–1795. doi:10.1101/gr.143000. PMC 310948. PMID 11076863.
• Sgard F, Charpantier E, Bertrand S, et al. (2002). "A novel human nicotinic receptor subunit, alpha10, that confers functionality to the alpha9-subunit". Mol. Pharmacol. 61 (1): 150–159. doi:10.1124/mol.61.1.150. PMID 11752216. S2CID 42831541.
• Strausberg RL, Feingold EA, Grouse LH, et al. (2003). "Generation and initial analysis of more than 15,000 full-length human and mouse cDNA sequences". Proc. Natl. Acad. Sci. U.S.A. 99 (26): 16899–16903. Bibcode:2002PNAS...9916899M. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• Lustig LR, Peng H (2003). "Chromosome location and characterization of the human nicotinic acetylcholine receptor subunit alpha (alpha) 9 (CHRNA9) gene". Cytogenet. Genome Res. 98 (2–3): 154–159. doi:10.1159/000069804. PMID 12697997. S2CID 30207588.
• Valor LM, Castillo M, Ortiz JA, Criado M (2003). "Transcriptional regulation by activation and repression elements located at the 5'-noncoding region of the human alpha9 nicotinic receptor subunit gene". J. Biol. Chem. 278 (39): 37249–37255. doi:10.1074/jbc.M307043200. hdl:10261/338645. PMID 12860975.
• Gerhard DS, Wagner L, Feingold EA, et al. (2004). "The Status, Quality, and Expansion of the NIH Full-Length cDNA Project: The Mammalian Gene Collection (MGC)". Genome Res. 14 (10B): 2121–2127. doi:10.1101/gr.2596504. PMC 528928. PMID 15489334.
• Peng H, Ferris RL, Matthews T, et al. (2004). "Characterization of the human nicotinic acetylcholine receptor subunit alpha (alpha) 9 (CHRNA9) and alpha (alpha) 10 (CHRNA10) in lymphocytes". Life Sci. 76 (3): 263–280. doi:10.1016/j.lfs.2004.05.031. PMID 15531379.
• Hillier LW, Graves TA, Fulton RS, et al. (2005). "Generation and annotation of the DNA sequences of human chromosomes 2 and 4". Nature. 434 (7034): 724–731. Bibcode:2005Natur.434..724H. doi:10.1038/nature03466. PMID 15815621.
• Chernyavsky AI, Arredondo J, Vetter DE, Grando SA (2007). "CENTRAL ROLE OF α9 ACETYLCHOLINE RECEPTOR IN COORDINATING KERATINOCYTE ADHESION AND MOTILITY AT THE INITIATION OF EPITHELIALIZATION". Exp. Cell Res. 313 (16): 3542–3555. doi:10.1016/j.yexcr.2007.07.011. PMC 2682983. PMID 17706194.

External links

• CHRNA9+protein,+human at the U.S. National Library of Medicine Medical Subject Headings (MeSH)
• Human CHRNA9 genome location and CHRNA9 gene details page in the UCSC Genome Browser.

This article incorporates text from the United States National Library of Medicine, which is in the public domain.