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Mammary Tumors and Mammary Tumor Virus Expression in Hybrid Mice of Strains C57BL and GR

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Journal J Exp Med
Date 1977 Nov 1
PMID 200697
Citations 5
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Abstract

Mammary tumorigenesis in genetic crosses between the high mammary tumor incidence GR and the low incidence C57BL mouse strains is highly correlated with murine mammary tumor virus expression in milk. Although the F1 and first backcross females had a mammary tumor incidence which was consistent with a single dominant gene segregation, the tumor incidence in the critical second backcross segregants disproved the single gene hypothesis. Genetic factors were clearly involved in regulation of virus expression which in turn correlated with both tumor incidence and tumor latency; these complex phenotypes are however best explained as threshold or quasicontinuous characters. As predicted from this model, the age specific incidence of mammary tumors showed a broad peak at 14-19 mo of age with no evidence of an early or late phase. Hematopoietic tumors showed no correlation with virus expression or mammary tumorigenesis suggesting different etiologies for these tumors.

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