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The autosomal recessive mutations fa (rat) and db (mouse) cause obesity syndromes that develop early and ultimately become severe. Although both fa/fa rats and db/db mice have been studied extensively as models of human obesity and diabetes, the molecular bases of these phenotypes remain unknown. We have mapped fa in 50 fa/fa (obese) offspring of a (13M x Brown Norway) F1 fa/+ intercross relative to two molecular markers, Ifa and Glut-1, which flank db on mouse chromosome 4 and which are located on rat chromosome 5. Ifa and Glut-1 are linked to fa, with a gene order, Ifa-fa-Glut-1, that is identical to that for the region around db in the mouse genome. These results place fa on rat chromosome 5 and suggest that db and fa are mutations in homologous genes.

Rat obesity gene fatty (fa) maps to chromosome 5: evidence for homology with the mouse gene diabetes (db).