gap junction protein beta 4
Last updated 18 Aug 2020
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The GJB4 gene provides instructions for making a protein called gap junction beta 4, more commonly known as connexin 30.3. This protein is part of the connexin family, a group of proteins that form channels called gap junctions on the surface of cells. Gap junctions open and close to regulate the flow of nutrients, charged atoms (ions), and other signaling molecules from one cell to another. They are essential for direct communication between neighboring cells.
Normal function
The GJB4 gene provides instructions for making a protein called gap junction beta 4, more commonly known as connexin 30.3. This protein is part of the connexin family, a group of proteins that form channels called gap junctions on the surface of cells. Gap junctions open and close to regulate the flow of nutrients, charged atoms (ions), and other signaling molecules from one cell to another. They are essential for direct communication between neighboring cells.
Connexin 30.3 is found in several different tissues, including the outermost layer of the skin (the epidermis). This protein appears to play a role in the growth and maturation of epidermal cells.
Conditions referring to this gene or chromosome
Other names
connexin 30.3
connexin-30.3
CX30.3
CXB4_HUMAN
EKV
gap junction beta-4 protein
gap junction protein, beta 4, 30.3kDa
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Further reading and references
- gap junction protein beta 4; MedlinePlus, National Library of Medicine.
- Macari F, Landau M, Cousin P, Mevorah B, Brenner S, Panizzon R, Schorderet DF, Hohl D, Huber M. Mutation in the gene for connexin 30.3 in a family with erythrokeratodermia variabilis. Am J Hum Genet. 2000 Nov;67(5):1296-301. doi: 10.1016/S0002-9297(07)62957-7. Epub 2000 Oct 3.
- Richard G, Brown N, Rouan F, Van der Schroeff JG, Bijlsma E, Eichenfield LF, Sybert VP, Greer KE, Hogan P, Campanelli C, Compton JG, Bale SJ, DiGiovanna JJ, Uitto J. Genetic heterogeneity in erythrokeratodermia variabilis: novel mutations in the connexin gene GJB4 (Cx30.3) and genotype-phenotype correlations. J Invest Dermatol. 2003 Apr;120(4):601-9. doi: 10.1046/j.1523-1747.2003.12080.x.
- Sbidian E, Bousseloua N, Jonard L, Leclerc-Mercier S, Bodemer C, Hadj-Rabia S. Novel mutation in GJB4 gene (connexin 30.3) in a family with erythrokeratodermia variabilis. Acta Derm Venereol. 2013 Mar 27;93(2):193-5. doi: 10.2340/00015555-1436. No abstract available.
- Scott CA, O'Toole EA, Mohungoo MJ, Messenger A, Kelsell DP. Novel and recurrent connexin 30.3 and connexin 31 mutations associated with erythrokeratoderma variabilis. Clin Exp Dermatol. 2011 Jan;36(1):88-90. doi: 10.1111/j.1365-2230.2010.03945.x.
- van Steensel MA, Oranje AP, van der Schroeff JG, Wagner A, van Geel M. The missense mutation G12D in connexin30.3 can cause both erythrokeratodermia variabilis of Mendes da Costa and progressive symmetric erythrokeratodermia of Gottron. Am J Med Genet A. 2009 Feb 15;149A(4):657-61. doi: 10.1002/ajmg.a.32744.
- Yoshikata-Isokawa Y, Itoh M, Nakagawa H. Japanese sporadic case of erythrokeratodermia variabilis caused by the connexin-30.3 (GJB4) mutation: Is Glycine 12 a mutational hotspot in the connexin family? J Dermatol. 2016 Jul;43(7):830-1. doi: 10.1111/1346-8138.13277. Epub 2016 Jan 30. No abstract available.
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