The iddm4 locus segregates with diabetes susceptibility in congenic WF.iddm4 rats

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Department of Medicine, Diabetes Division; Department of Pathology

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Adoptive Transfer; Alleles; Animals; *Chromosome Mapping; Diabetes Mellitus, Type 1; Disease Models, Animal; Genetic Markers; Genetic Predisposition to Disease; Homozygote; Islets of Langerhans; Pancreatic Diseases; Rats; Rats, Mutant Strains


Life Sciences | Medicine and Health Sciences


Viral antibody-free BBDR and WF rats never develop spontaneous diabetes. BBDR rats, however, develop autoimmune diabetes after perturbation of the immune system, e.g., by viral infection. We previously identified a disease-susceptibility locus in the BBDR rat, iddm4, which is associated with the development of autoimmune diabetes after treatment with polyinosinic:polycytidylic acid and an antibody that depletes ART2(+) regulatory cells. We have now developed lines of congenic WF.iddm4 rats and report that in an intercross of N5 generation WF.iddm4 rats, approximately 70% of animals either homozygous or heterozygous for the BBDR origin allele of iddm4 became hyperglycemic after treatment to induce diabetes. Fewer than 20% of rats expressing the WF origin allele of iddm4 became diabetic. Testing the progeny of various recombinant N5 WF.iddm4 congenic rats for susceptibility to diabetes suggests that iddm4 is centered on a small segment of chromosome 4 bounded by the proximal marker D4Rat135 and the distal marker D4Got51, an interval of


Diabetes. 2002 Nov;51(11):3254-62.

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