Abstract
Friend murine leukemia virus clone A8 causes spongiform neurodegeneration in the rat brain. A 0.3-kb fragment containing the R-U5-5' leader sequence of A8 is required in addition to the A8-env gene to induce spongiosis. The A8-env gene is a primary determinant of neuropathogenicity. Comparative studies of the neuropathogenic virus R7f, which carries the 0.3-kb fragment of A8 and A8-env on the background of the non-neuropathogenic clone 57, and the non-neuropathogenic virus Rec5, which carries A8-env on the background of 57, showed that the 0.3-kb fragment of A8 was responsible for increasing the ratio of Env/Gag expression in the brain, but not in the spleen.
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