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. 1987 Jan;61(1):66–74. doi: 10.1128/jvi.61.1.66-74.1987

Mammary tumorigenesis in feral mice: identification of a new int locus in mouse mammary tumor virus (Czech II)-induced mammary tumors.

D Gallahan, R Callahan
PMCID: PMC255203  PMID: 3023708

Abstract

A population of Mus musculus subsp. musculus (Czech II), recently isolated from the wild, lack endogenous mouse mammary tumor virus (MMTV) proviral genomes. Some of these mice carry an infectious MMTV [designated MMTV (Czech II)] that is transmitted in the milk and is associated with mammary tumor development. This virus is distinct from laboratory strains of MMTV present in inbred mice. An MMTV (Czech II) genome was found within a 0.5-kilobase region of the cellular genome in five of 16 Czech II mammary tumors. MMTV insertion at this site activates expression of a 2.4-kilobase species of RNA from a previously silent cellular gene. This region of the cellular genome was designated int-3 since it is unrelated to the int-1 and int-2 loci. The int-3 locus does not appear to correspond to other proto-oncogenes but is well conserved among mammalian species.

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