GJA5

"Cx40" redirects here. For the joystick, see Atari CX40.

Gap junction alpha-5 protein (GJA5), also known as connexin 40 (Cx40) — is a protein that in humans is encoded by the GJA5 gene.

GJA5
Identifiers
Aliases	GJA5, ATFB11, CX40, gap junction protein alpha 5
External IDs	OMIM: 121013; MGI: 95716; HomoloGene: 3856; GeneCards: GJA5; OMA:GJA5 - orthologs
Gene location (Human) Chr. Chromosome 1 (human) Band 1q21.2 Start 147,756,199 bp End 147,773,362 bp
Gene location (Mouse) Chr. Chromosome 3 (mouse) Band 3 F2.1|3 42.04 cM Start 96,812,009 bp End 96,984,732 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in placenta right coronary artery left coronary artery right auricle lower lobe of lung popliteal artery tibial arteries upper lobe of lung Descending thoracic aorta upper lobe of left lung Top expressed in yolk sac vascular endothelium vasculature of trunk footplate dorsal aorta atrium primordial ventricle tongue muscle myocardium of atrium abdominal aorta More reference expression data BioGPS More reference expression data
Gene ontology Molecular function gap junction channel activity involved in cardiac conduction electrical coupling gap junction channel activity gap junction channel activity involved in AV node cell-bundle of His cell electrical coupling gap junction hemi-channel activity gap junction channel activity involved in SA node cell-atrial cardiac muscle cell electrical coupling gap junction channel activity involved in atrial cardiac muscle cell-AV node cell electrical coupling gap junction channel activity involved in bundle of His cell-Purkinje myocyte electrical coupling gap junction channel activity involved in Purkinje myocyte-ventricular cardiac muscle cell electrical coupling disordered domain specific binding connexin binding Cellular component integral component of membrane cell projection membrane intercalated disc plasma membrane integral component of plasma membrane cell junction gap junction connexin complex Biological process bundle of His cell to Purkinje myocyte communication by electrical coupling skeletal system development regulation of ventricular cardiac muscle cell membrane depolarization cardiac conduction system development ventricular septum development negative regulation of blood pressure ventricular septum morphogenesis SA node cell action potential AV node cell to bundle of His cell communication regulation of atrial cardiac muscle cell membrane depolarization ventricular cardiac muscle cell action potential cell communication by electrical coupling involved in cardiac conduction outflow tract morphogenesis atrial ventricular junction remodeling cell communication by electrical coupling mitral valve development pulmonary valve formation embryonic heart tube development regulation of Purkinje myocyte action potential atrial septum morphogenesis cell communication potassium ion transport regulation of bundle of His cell action potential heart development regulation of renin secretion into blood stream blood vessel development cardiac conduction embryonic limb morphogenesis protein complex oligomerization AV node cell to bundle of His cell communication by electrical coupling positive regulation of vasoconstriction angiogenesis artery morphogenesis transmembrane transport endothelium development renal system process involved in regulation of systemic arterial blood pressure regulation of systemic arterial blood pressure gap junction assembly positive regulation of cell communication by chemical coupling cell communication involved in cardiac conduction regulation of cardiac muscle contraction septum primum development regulation of heart rate by cardiac conduction regulation of AV node cell action potential negative regulation of glomerular filtration atrial septum development vasomotion foramen ovale closure cell communication by chemical coupling regulation of atrial cardiac muscle cell action potential regulation of ventricular cardiac muscle cell membrane repolarization regulation of membrane depolarization during cardiac muscle cell action potential SA node cell to atrial cardiac muscle cell communication by electrical coupling atrial cardiac muscle cell to AV node cell communication by electrical coupling Purkinje myocyte to ventricular cardiac muscle cell communication by electrical coupling blood vessel diameter maintenance Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 2702 14613 Ensembl ENSG00000265107 ENSMUSG00000057123 UniProt P36382 Q01231 RefSeq (mRNA) NM_005266 NM_181703 NM_001271628 NM_008121 RefSeq (protein) NP_005257 NP_859054 NP_001258557 NP_032147 Location (UCSC) Chr 1: 147.76 – 147.77 Mb Chr 3: 96.81 – 96.98 Mb PubMed search
Wikidata
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Function

This gene is a member of the connexin gene family. The encoded protein is a component of gap junctions, which are composed of arrays of intercellular channels that provide a route for the diffusion of low molecular weight materials from cell to cell. Mutations in this gene may be associated with atrial fibrillation. Alternatively spliced transcript variants encoding the same isoform have been described.

GJA5 has been identified as the gene that is responsible for the phenotypes observed with congenital heart diseases on the 1q21.1 location. In case of a duplication of GJA5 tetralogy of Fallot is more common. In case of a deletion other congenital heart diseases than tetralogy of Fallot are more common.

Related gene problems

• 1q21.1 deletion syndrome
• 1q21.1 duplication syndrome

See also

• Connexin
• Gap junction

Further reading

• Andrew L Harris; Darren Locke (2009). Connexins, A Guide. New York: Springer. p. 574. ISBN 978-1-934115-46-6.
• Teunissen BE, Bierhuizen MF (2004). "Transcriptional control of myocardial connexins". Cardiovasc. Res. 62 (2): 246–55. doi:10.1016/j.cardiores.2003.12.011. PMID 15094345.
• Kanter HL, Saffitz JE, Beyer EC (1992). "Cardiac myocytes express multiple gap junction proteins". Circ. Res. 70 (2): 438–44. doi:10.1161/01.res.70.2.438. PMID 1310450.
• Willecke K; Jungbluth S; Dahl E; et al. (1991). "Six genes of the human connexin gene family coding for gap junctional proteins are assigned to four different human chromosomes". Eur. J. Cell Biol. 53 (2): 275–80. PMID 1964417.
• Chen SC; Davis LM; Westphale EM; et al. (1995). "Expression of multiple gap junction proteins in human fetal and infant hearts". Pediatr. Res. 36 (5): 561–6. doi:10.1203/00006450-199411000-00002. PMID 7877871.
• Kanter HL, Saffitz JE, Beyer EC (1994). "Molecular cloning of two human cardiac gap junction proteins, connexin40 and connexin45". J. Mol. Cell. Cardiol. 26 (7): 861–8. doi:10.1006/jmcc.1994.1103. PMID 7966354.
• Mehta PP; Lokeshwar BL; Schiller PC; et al. (1996). "Gap-junctional communication in normal and neoplastic prostate epithelial cells and its regulation by cAMP". Mol. Carcinog. 15 (1): 18–32. doi:10.1002/(SICI)1098-2744(199601)15:1<18::AID-MC4>3.0.CO;2-O. PMID 8561862. S2CID 23480353.
• Gelb BD; Zhang J; Cotter PD; et al. (1997). "Physical mapping of the human connexin 40 (GJA5), flavin-containing monooxygenase 5, and natriuretic peptide receptor a genes on 1q21". Genomics. 39 (3): 409–11. doi:10.1006/geno.1996.4516. PMID 9119381.
• Kilarski WM; Dupont E; Coppen S; et al. (1998). "Identification of two further gap-junctional proteins, connexin40 and connexin45, in human myometrial smooth muscle cells at term". Eur. J. Cell Biol. 75 (1): 1–8. doi:10.1016/S0171-9335(98)80040-X. PMID 9523149.
• van Rijen HV, van Kempen MJ, Postma S, Jongsma HJ (1998). "Tumour necrosis factor alpha alters the expression of connexin43, connexin40, and connexin37 in human umbilical vein endothelial cells". Cytokine. 10 (4): 258–64. doi:10.1006/cyto.1997.0287. PMID 9617570.
• Vozzi C; Dupont E; Coppen SR; et al. (1999). "Chamber-related differences in connexin expression in the human heart". J. Mol. Cell. Cardiol. 31 (5): 991–1003. doi:10.1006/jmcc.1999.0937. PMID 10336839.
• Haefliger JA, Goy JJ, Waeber G (2000). "Sporadic cases of dilated cardiomyopathies associated with atrioventricular conduction defects are not linked to mutation within the connexins 40 and 43 genes". Eur. Heart J. 20 (24): 1843. doi:10.1053/euhj.1999.1718. PMID 10581143.
• van Rijen HV, van Veen TA, Hermans MM, Jongsma HJ (2000). "Human connexin40 gap junction channels are modulated by cAMP". Cardiovasc. Res. 45 (4): 941–51. doi:10.1016/S0008-6363(99)00373-9. PMID 10728420.
• Oviedo-Orta E, Hoy T, Evans WH (2000). "Intercellular communication in the immune system: differential expression of connexin40 and 43, and perturbation of gap junction channel functions in peripheral blood and tonsil human lymphocyte subpopulations". Immunology. 99 (4): 578–90. doi:10.1046/j.1365-2567.2000.00991.x. PMC 2327182. PMID 10792506.
• Vis JC; Nicholson LF; Faull RL; et al. (2002). "Connexin expression in Huntington's diseased human brain". Cell Biol. Int. 22 (11–12): 837–47. doi:10.1006/cbir.1998.0388. PMID 10873295. S2CID 8034526.
• Valiunas V, Gemel J, Brink PR, Beyer EC (2001). "Gap junction channels formed by coexpressed connexin40 and connexin43". Am. J. Physiol. Heart Circ. Physiol. 281 (4): H1675–89. doi:10.1152/ajpheart.2001.281.4.H1675. PMID 11557558. S2CID 960859.
• Kaba RA; Coppen SR; Dupont E; et al. (2003). "Comparison of connexin 43, 40 and 45 expression patterns in the developing human and mouse hearts". Cell Commun. Adhes. 8 (4–6): 339–43. doi:10.3109/15419060109080750. PMID 12064615. S2CID 23388741.
• Cronier L; Defamie N; Dupays L; et al. (2003). "Connexin expression and gap junctional intercellular communication in human first trimester trophoblast" (PDF). Mol. Hum. Reprod. 8 (11): 1005–13. doi:10.1093/molehr/8.11.1005. PMID 12397213.
• Simon AM, McWhorter AR (2002). "Vascular abnormalities in mice lacking the endothelial gap junction proteins connexin37 and connexin40". Dev. Biol. 251 (2): 206–20. doi:10.1006/dbio.2002.0826. PMID 12435353.
• 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): 16899–903. Bibcode:2002PNAS...9916899M. doi:10.1073/pnas.242603899. PMC 139241. PMID 12477932.
• Dupays L; Mazurais D; Rücker-Martin C; et al. (2003). "Genomic organization and alternative transcripts of the human Connexin40 gene". Gene. 305 (1): 79–90. doi:10.1016/S0378-1119(02)01229-5. PMID 12594044.