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Diabetes, Vol 49, Issue 4 589-596, Copyright © 2000 by American Diabetes Association
Genetic modifiers of the insulin resistance phenotype in mice
Y Kido, N Philippe, AA Schaffer and D Accili
Developmental Endocrinology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, USA.
Insulin resistance can result from genetic interactions among
susceptibility alleles. To identify genetic loci predisposing to insulin
resistance, we used crosses between different strains of mice with a
targeted null allele of the insulin receptor gene. On the genetic
background of B6 mice, the insulin receptor gene mutation causes mild
hyperinsulinemia. In contrast, on the genetic background of 129/Sv mice,
the same mutation causes severe hyperinsulinemia, suggesting that the
129/Sv strain harbors alleles that interact with the insulin receptor
mutation and predispose to insulin resistance. As a first step to identify
these alleles, we generated an F2 intercross between insulin receptor
heterozygous mutant mice on B6 and 129/Sv backgrounds (B6IR x 129IR) and
performed a genome-wide scan with polymorphic markers at a 20-cM
resolution. We report the identification of loci on chromosomes 2
(logarithm of odds [LOD] 5.58) and 10 (LOD 5.58) that show significant
evidence for linkage to plasma insulin levels as a quantitative trait.
These findings indicate that targeted mutations in knockout mice can be
used to unravel the complex genetic interactions underlying insulin
resistance.

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Copyright © 2000 by the American Diabetes Association.
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