Lack of IRS-1 codon 513 and 972 polymorphism in Pima Indians.
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.
Celi
F S
FS
National Institute on Aging, National Institutes of Health, Baltimore, Maryland, USA.
Silver
K
K
Walston
J
J
Knowler
W C
WC
Bogardus
C
C
Shuldiner
A R
AR
D000328:Adult; D001483:Base Sequence; D003062:Codon; D006801:Humans; D007198:Indians, North American / Q000235:genetics*; D055504:Insulin Receptor Substrate Proteins; D008969:Molecular Sequence Data; D015345:Oligonucleotide Probes / Q000235:genetics; D010750:Phosphoproteins / Q000235:genetics*; D016133:Polymerase Chain Reaction; D011110:Polymorphism, Genetic
D003062:Codon; C526292:IRS1 protein, human; D055504:Insulin Receptor Substrate Proteins; D015345:Oligonucleotide Probes; D010750:Phosphoproteins