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In a series of blot hybridization experiments, using a xenotropic envelope probe and restriction enzymes known to cut xenotropic proviral DNA a single time (EcoRI) or not at all (HindIII), we have studied the organization and relationship of endogenous xenotropic env-related sequences in various mouse strains. Multiple copies (18 to 28) of xenotropic env-reactive fragments were found in all mouse DNAs after digestion with either HindIII or EcoRI, and the majority of fragments were of sizes compatible with their origin from full-length proviral DNA. Five HindIII and five EcoRI restriction fragments were common to all inbred mouse DNAs tested. In addition, each strain exhibited unique characteristic xenotropic env-reactive bands; these bands were remarkably stable during many years of inbreeding. The cleavage patterns characteristic of each strain were also useful for showing genealogical relatedness among the various inbred mice.

Organization and stability of endogenous xenotropic murine leukemia virus proviral DNA in mouse genomes