Leslie J. Baier, Paskasari A. Permana, Xiaolin Yang, Richard E. Pratley, Robert L. Hanson, Gong-Qing Shen, David Mott, William C. Knowler, Nancy J. Cox, Yukio Horikawa, Naohisa Oda, Graeme I. Bell, Clifton Bogardus
J Clin Invest.
2000;
106(7):0–0
doi:10.1172/JCI10665
This article Copyright © 2000, The American Society for Clinical Investigation
Abstract
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P
revious linkage studies in Mexican-Americans localized a major susceptibility locus for type 2 diabetes, NIDDM1, to chromosome 2q. This evidence for linkage to type 2 diabetes was recently found to be associated with a common G→A polymorphism (UCSNP-43) within the CAPN10 gene. The at-risk genotype was homozygous for the UCSNP-43 G allele. In the present study among Pima Indians, the UCSNP-43 G/G genotype was not associated with an increased prevalence of type 2 diabetes. However, Pima Indians with normal glucose tolerance, who have a G/G genotype at UCSNP-43, were found to have decreased rates of postabsorptive and insulin-stimulated glucose turnover that appear to result from decreased rates of glucose oxidation. In addition, G/G homozygotes were found to have reduced CAPN10 mRNA expression in their skeletal muscle. A decreased rate of insulin-mediated glucose turnover, or insulin resistance, is one mechanism by which the polymorphism in CAPN10 may increase susceptibility to type 2 diabetes mellitus in older persons.
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