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Journal of Clinical Endocrinology & Metabolism, Vol 80, 2827-2829, Copyright © 1995 by Endocrine Society

ARTICLES

Lack of IRS-1 codon 513 and 972 polymorphism in Pima Indians

FS Celi, K Silver, J Walston, WC Knowler, C Bogardus and AR Shuldiner
National Institute on Aging, National Institutes of Health, Baltimore, Maryland, USA.

Insulin receptor substrate-1 (IRS-1), an endogenous substrate for the insulin receptor tyrosine kinase, mediates many or all of the metabolic actions of insulin. Recently, polymorphism at codons 513 and 972 of the IRS-1 gene resulting in 2 amino acid substitutions that were associated with type II diabetes were found in a Caucasian population. Using allele specific oligonucleotide (ASO) hybridization, we screened 242 diabetic and 190 nondiabetic Pima Indians, a population with a very high prevalence of type II diabetes. Neither of the two mutations was present in either diabetic or nondiabetic subjects. We conclude that polymorphism at codons 513 and 972 of the IRS-1 gene observed in certain Caucasian populations is very rare or absent in Pima Indians.


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