This report describes biochemical and cellular characterization of a spontaneous mutation in ICR mice; the mutation has been phenotypically characterized as autosomal recessive
jaundice in neonates and juveniles and given the gene symbol hub (J. Hered. 76:441-446, 1985; Mouse Newslett. 73:28, 1985). The results obtained demonstrate that (1) mice homozygous for the mutation are deficient in
bilirubin-UDP-glucuronosyltransferase activity, and there is no deficiency in heterozygous mice, (2) the deficiency is lifelong, even though the clinical symptom of
jaundice is transitory and restricted to neonates or juveniles, (3)
bilirubin-UDP-glucuronosyltransferase activity in mutant and nonmutant mice is similarly induced by
triiodothyronine, (4) glucuronidation and xylodation of
bilirubin probably occur as the result of separate
enzyme forms in mice, and (5) Western analysis using antibody to rat
bilirubin-UDP-glucuronosyltransferase indicates that although there is no electrophoretic mobility difference, there is a diffuse band missing in mutant mice. Hepatic
hyperplasia, cytomegaly, single-cell
necrosis, and eosinophilic foci are also pleiotropic traits associated with homozygous but not heterozygous hub. The hub/hub mouse will be useful in the study of substrate specificity and regulation within a complex gene family and, perhaps, provide a new and useful animal model for the long-term health effects of deficiency in the metabolism of
xenobiotics cleared via
UDP-glucuronosyltransferase.