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Logo of jcinvestThe Journal of Clinical InvestigationCurrent IssueArchiveSubscriptionAbout the Journal
J Clin Invest. Jun 1988; 81(6): 1993–1998.
PMCID: PMC442653

Chromosomal localization of the genes for the vitronectin and fibronectin receptors alpha subunits and for platelet glycoproteins IIb and IIIa.

Abstract

The integrins, a family of related membrane receptors involved in cell-cell and cell-matrix interactions, are heterodimeric complexes of alpha and beta subunits. To begin to understand the evolution of these complexes, we studied the genomic organization of several alpha and beta integrin subunits. Using both somatic cell hybrids and an in situ hybridization technique, we have determined the chromosomal location of the genes for the alpha subunits of the vitronectin receptor (VNR alpha), the fibronectin receptor (FNR alpha), and for the alpha subunit of the platelet glycoprotein IIb/IIIa complex, GPIIb. In addition, we have determined the chromosomal location of the gene for the beta subunit of the GPIIb/IIIa heterodimer, GPIIIa. Our studies indicate that the alpha subunits do not localize to a single locus, but that each is found on a different chromosome. The gene for VNR alpha is located on chromosome 2, the gene for FNR alpha is on chromosome 12q11----13, and the gene for GPIIb is on chromosome 17q21----23. In contrast to the chromosomal dispersion of the alpha subunits, the genes for GPIIb and GPIIIa are physically close, with the gene for GPIIIa also located on chromosome 17q21----23. These studies indicate that the genes for the alpha subunits of the integrin family have been dispersed during evolution while GPIIb and GPIIIa are in close physical proximity. This physical proximity of GPIIb and GPIIIa may be involved in the concurrent expression of these proteins by megakaryocytes, and may result in linkage disequilibrium between these two genes, which would limit the use of restriction length polymorphisms in linkage studies of GPIIb/IIIa abnormalities in small kindreds.

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Selected References

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