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Phenotypes Associated with This Genotype
Not Specified
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Irs1tm1Tka mutation (0 available); any Irs1 mutation (29 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
• at 3, 8, and 15 weeks, the weights of homozygotes are ~30% less than those of wild-type or heterozygous littermates
• homozygotes are viable and fertile but exhibit a growth retardation at 3, 8, and 15 weeks of age
• at E18.5, the weights of homozygotes are ~80% of those of wild-type or heterozygous controls
• at E15.5, homozygotes display growth retardation relative to wild-type controls

• homozygotes display normal serum IGF1, IGF2 and growth hormone levels relative to wild-type mice
• homozygotes maintain normal fasting glucose and glucose tolerance (by compensatory beta-cell hyperplasia)
• homozygotes exhibit a higher basal glucose transport of adipocytes relative to wild-type mice; in contrast, insulin-stimulated glucose transport of mutant adipocytes is significantly impaired
• the serum insulin levels of homozygotes before and after glucose load are significantly higher than those of wild-type and heterozygous mutant mice
• homozygotes exhibit a mild to moderate insulin, IGF1, and IGF2 resistance

Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB), Gene Ontology (GO)
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last database update
MGI 6.16
The Jackson Laboratory