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A pedigreed breeding population of feral Mus cervicolor popaeus with a high incidence of mammary tumors, arising between 6 and 14 months of age, is described. These mice were chronically infected with a type B retrovirus which is distantly related to the mouse mammary tumor virus (MMTV) of inbred strains of Mus musculus. MMTV-induced mammary tumors in inbred mice frequently (80%) contained an insertion of the viral genome into the int-1 or int-2 loci of the tumor cellular genome. These two cellular genetic loci were also altered by viral insertion in 11 of 20 M. cervicolor popaeus mammary tumor cellular DNAs tested. Results of our study of mammary tumorigenesis in feral mice demonstrate that viral-induced rearrangement and activation of the int loci are not limited to the genetic background of inbred mice selected for highly infectious MMTV and a high incidence of mammary tumors.

Mammary tumorigenesis in feral Mus cervicolor popaeus