Allelic variation on chromosome 5 controls β-cell mass expansion during hyperglycemia in leptin receptor-deficient diabetes mice

Na Luo, Mei Liu Shun, Hong Liu, Qiong Li, Qun Xu, Xi Sun, Brandi Davis, Jing Li, Streamson Chua

Research output: Contribution to journalArticle

6 Scopus citations


Leptin signaling is a critical component of normal insulin sensitivity. Overt hyperglycemia and type 2 diabetes mellitus can be manifested in states of leptin signaling deficiencies by the additional effects of other genetic factors. We have previously described the contrasting insulin sensitivities and glycemic states of two congenic diabetes (db/db) mouse strains. C57BL/6J db/db mice have mild insulin resistance and achieve euglycemia with mild hyperinsulinemia. FVB db/db mice have severe insulin resistance and are hyperglycemic despite escalating hyperinsulinemia with expanded pancreatic β-cell mass. Analysis of obese progeny from the two reciprocal back-crosses suggests that genetic modifiers for insulin sensitivity are separable from loci that modulate β-cell mass. A genome scan of the backcross to FVB suggests that one or more modifier genes are present on chromosome 5. This evidence is supported by the phenotypes of multiple incipient congenic strains wherein the hyperglycemia observed in obese FVB mice is reproduced. With similar degrees of hyperglycemia in obese mice of these strains, the haplotype at chromosome 5 is associated with β-cell mass and circulating insulin concentrations. Finally, we offer arguments that production of multiple incipient congenic lines is an economical alternative to the production of speed congenic strains.

Original languageEnglish (US)
Pages (from-to)2287-2295
Number of pages9
Issue number5
Publication statusPublished - May 1 2006


ASJC Scopus subject areas

  • Endocrinology

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