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The quantitative trait locus (QTL) mapping in segregating crosses of NSY (Nagoya-Shibata-Yasuda) mice, an animal model of type 2 diabetes, with nondiabetic strain C3H/He mice has identified diabetogenic QTLs on multiple chromosomes. The QTL on chromosome 11 (Chr11) ( Nidd1n ) showing the largest effect on hyperglycemia was confirmed by our previous studies with homozygous consomic mice, C3H-11 NSY , in which the NSY-derived whole Chr11 was introgressed onto control C3H background genes. C3H-11 NSY  mice also showed a streptozotocin (STZ) sensitivity. In the present study, we constructed heterozygous C3H-11 NSY  mice and the phenotypes were analyzed in detail in comparison with those of homozygous C3H-11 NSY  and C3H mice. Heterozygous C3H-11 NSY  mice had significantly higher blood glucose levels and STZ sensitivity than those in C3H mice. Hyperglycemia and STZ sensitivity in heterozygous C3H-11 NSY  mice, however, were not as severe as in homozygous C3H-11 NSY  mice. The body weight and fat pad weight in heterozygous C3H-11 NSY  mice were similar to those in C3H and homozygous C3H-11 NSY  mice. These data indicated that the introgression of Chr11 of the diabetes-susceptible NSY strain onto diabetes-resistant C3H caused marked changes in the glucose tolerance and STZ susceptibility even in a heterozygous state, and suggested that the mode of inheritance of a gene or genes on Chr11 for hyperglycemia and STZ sensitivity is additive.

Dose Effect and Mode of Inheritance of Diabetogenic Gene on Mouse Chromosome 11