Abstract
We studied endogenous type C virus-related sequences of mice by annealing Moloney murine leukemia virus DNA to agarose gel blot transfers of uninfected mouse cell DNA which had been cleaved with restriction enzymes. We found that many of the endogenous murine leukemia virus-related sequences in mice consist of two organizational classes that are integrated into many different loci. Both of these classes resemble standard murine leukemia virus proviral DNA in both size and sequence organization. All lines of inbred mice examined contained both organizational classes, as did feral isolates of Mus musculus domesticus. However, a related Asian subspecies, Mus musculus molossinus, contained different organizational classes of endogenous murine leukemia virus-related sequences. Among inbred strains and feral isolates of M. musculus domesticus, the murine leukemia virus-related sequences were present at different loci. This suggested that most of these sequences were acquired relatively recently during subspeciation and inbreeding.
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