These transgenic mice express mouse cyclin D1 under the direction of the rat fatty acid binding protein 1 promoter (-596 to +21 fragment). Mice that are hemizygous for the transgene are viable, normal in size and do not display any gross physical or behavioral abnormalities. Hemizygous mutant mice exhibit reduced fertility after 3 months of age. Transgenic mice overexpress cyclin D1 in the liver and epithelial cells of the small intestine and colon. A lower level of expression occurs in the kidneys. Onset of progressive liver disease begins at one month of age with hepatomegaly. Male transgenic mice exhibit more severe hepatomegaly than transgenic females. By 6 months of age, all transgenic males and half of the transgenic females display hepatocellular dysplasia. Eighty-seven percent of transgenic males and 69% of transgenic females develop hepatocellular adenoma or hepatocellular carcinoma by 15 months of age. This mutant mouse strain may be useful in studies of hepatocellular carcinogenesis. <P> <I>In an attempt to offer alleles on well-characterized or multiple genetic backgrounds, alleles are frequently moved to a genetic background different from that on which an allele was first characterized. This is the case for the strain above. It should be noted that the phenotype could vary from that originally described. We will modify the strain description if necessary as published results become available.</I>

These LFABP-cyclin D1 mice express a transgene containing mouse cyclin D1 and develop a progressive liver disease.



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