Serological characterization of B-tropic viruses of C57BL mice: possible origin by recombination of endogenous N-tropic and xenotropic viruses.

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Abstract
The serological properties of the gag gene products p15 and p12 of N- and B-tropic viruses of C57BL mice were examined. Although these viruses were serologically identical by competition assays for proteins gp71 and p30, they were readily distinguishable in competition assays for proteins p15 and p12. Two isolates of N-tropic viruses had p12 serologically indistinguishable from AKR murine leukemia virus p12, while 2 B-tropic isolates had distinctly different p12. The latter p12 were serologically indistinguishable from the p12 purified from the B-tropic radiation leukemia virus (RadLV)-/VL-3. This p12 was indistinguishable from the p12 of the endogenous C57BL/Ka xenotropic virus. Similarly, the p15 of the B-tropic viruses were serologically distinct from the AKR murine leukemia virus type of p15, as was the p15 of 1 C57BL N-tropic virus, while another N-tropic isolate had a p15 identical to the AKR murine leukemia virus p15. The endogenous N-tropic virus of C57BL mice probably undergoes recombination with the endogenous, xenotropic virus and this mechanism is probably involved in the generation of B-tropic viruses in C57BL mice.