integrin subunit beta 3
Last updated 18 Aug 2020
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The ITGB3 gene provides instructions for making the beta3 subunit of a receptor protein called integrin alphaIIb/beta3 (αIIbβ3), which is found on the surface of small cells called platelets. Platelets circulate in blood and are an essential component of blood clots. The beta3 subunit attaches (binds) to the alphaIIb subunit, which is produced from the ITGA2B gene, to form integrin αIIbβ3. It is estimated that 80,000 to 100,000 copies of integrin αIIbβ3 are present on the surface of each platelet.
Normal function
The ITGB3 gene provides instructions for making the beta3 subunit of a receptor protein called integrin alphaIIb/beta3 (αIIbβ3), which is found on the surface of small cells called platelets. Platelets circulate in blood and are an essential component of blood clots. The beta3 subunit attaches (binds) to the alphaIIb subunit, which is produced from the ITGA2B gene, to form integrin αIIbβ3. It is estimated that 80,000 to 100,000 copies of integrin αIIbβ3 are present on the surface of each platelet.
During clot formation, integrin αIIbβ3 binds to a protein called fibrinogen. Attachment of integrin αIIbβ3 from adjacent platelets to the same fibrinogen protein helps platelets cluster together (platelet cohesion) to form a blood clot. Blood clots protect the body after injury by sealing off damaged blood vessels and preventing further blood loss. Integrin αIIbβ3 can also bind other proteins on platelets and in the blood as well as proteins within the intricate lattice that forms in the space between cells (extracellular matrix) to ensure proper clot formation and promote wound healing.
Conditions referring to this gene or chromosome
Other names
beta 3 integrin
CD61
GP3A
GPIIIa
integrin beta 3
integrin beta-3 precursor
integrin, beta 3 (platelet glycoprotein IIIa, antigen CD61)
platelet glycoprotein IIIa
platelet GPIIIa
platelet membrane glycoprotein IIIa
vitronectin receptor beta chain
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Further reading and references
- integrin subunit beta 3; MedlinePlus, National Library of Medicine.
- Kobayashi Y, Matsui H, Kanai A, Tsumura M, Okada S, Miki M, Nakamura K, Kunishima S, Inaba T, Kobayashi M. Identification of the integrin beta3 L718P mutation in a pedigree with autosomal dominant thrombocytopenia with anisocytosis. Br J Haematol. 2013 Feb;160(4):521-9. doi: 10.1111/bjh.12160. Epub 2012 Dec 17.
- Nurden AT, Fiore M, Nurden P, Pillois X. Glanzmann thrombasthenia: a review of ITGA2B and ITGB3 defects with emphasis on variants, phenotypic variability, and mouse models. Blood. 2011 Dec 1;118(23):5996-6005. doi: 10.1182/blood-2011-07-365635. Epub 2011 Sep 13.
- Nurden AT, Pillois X, Fiore M, Alessi MC, Bonduel M, Dreyfus M, Goudemand J, Gruel Y, Benabdallah-Guerida S, Latger-Cannard V, Negrier C, Nugent D, Oiron RD, Rand ML, Sie P, Trossaert M, Alberio L, Martins N, Sirvain-Trukniewicz P, Couloux A, Canault M, Fronthroth JP, Fretigny M, Nurden P, Heilig R, Vinciguerra C. Expanding the Mutation Spectrum Affecting alphaIIbbeta3 Integrin in Glanzmann Thrombasthenia: Screening of the ITGA2B and ITGB3 Genes in a Large International Cohort. Hum Mutat. 2015 May;36(5):548-61. doi: 10.1002/humu.22776.
- Nurden AT, Pillois X, Fiore M, Heilig R, Nurden P. Glanzmann thrombasthenia-like syndromes associated with Macrothrombocytopenias and mutations in the genes encoding the alphaIIbbeta3 integrin. Semin Thromb Hemost. 2011 Sep;37(6):698-706. doi: 10.1055/s-0031-1291380. Epub 2011 Nov 18.
- Pillitteri D, Pilgrimm AK, Kirchmaier CM. Novel Mutations in the GPIIb and GPIIIa Genes in Glanzmann Thrombasthenia. Transfus Med Hemother. 2010;37(5):268-277. doi: 10.1159/000320258. Epub 2010 Sep 15.
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