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Phenotypes Associated with This Genotype
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Leprdb mutation (11 available); any Lepr mutation (72 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
• mice of both sexes are obese

• Background Sensitivity: after a 2-day fast on refeeding with carbohydrate-free diet, female obese mice show a rise in glucose
• Background Sensitivity: obese mice have a prolonged period of hyperglycemia compared to obese B6.BKS-Leprdb mice where glucose levels rarely exceed 250 mg/dl
• fasting mice are hyperglycemic at 3 months of age, while obese B6.BKS-Leprdb fasted mice are euglycemic
• levels increase from 5 to 7 months in obese females to ~500 ng/ml, significantly higher than the males (~40 ng/ml) or obese B6.BKS-Leprdb females (~50 ng/ml)
• Background Sensitivity: at 3 months of age, females show a trend toward higher insulin levels compared to obese B6.BKS-Leprdb females; at 5-7 months insulin levels (~500 ng/ml) are ~10-fold higher than levels in obese female obese B6.BKS-Leprdb mice (~50 ng/ml)
• Background Sensitivity: at 7 months of age obese males are severely glucose intolerant with glucose levels of >400 mg/dl 90 minutes after glucose load compared to obese B6.BKS-Leprdb mice clear glucose load by 90 min
• Background Sensitivity: obese mice show a rapid increase of blood glucose above 400 mg/dl with diminished rate of glucose clearance
• at 7 months of age, 3U/kg of insulin does not alter circulating glucose levels, while in B6.BKS-Lepr mice, glucose decreases by 50% by 40 minutes; 12U/kg insulin does not cause a decrease in glucose in obese female mice on the FVB background
• at a dose of 3U/kg 6-week old mice show a diminished response to insulin
• circulating insulin levels in the fed state show that obese mice have exteme insulin resistance

endocrine/exocrine glands
• obese mice show massive expansion of beta cells (744 insulin +ve cells/islet cross-section in obese vs 165 +ve cells in lean mice); there are 4.5-fold more cells per islet cross-section in obese mice
• some islets in obese mice have more than 1000 cells per cross section; such islets are absent in lean mice

renal/urinary system
• at 7 months of age, obese mice show an increased mesangial matrix in most glomeruli compared to lean controls, resembling diabetic nephropathy; some small glomeruli have separated from the capsule with nearly obliterated microtubules

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
obesity DOID:9970 OMIM:601665

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last database update
MGI 6.10
The Jackson Laboratory