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. 1979 Apr;30(1):232–240. doi: 10.1128/jvi.30.1.232-240.1979

Differences in pathogenicity among cloned sublines of a murine leukemia virus.

K F Manly, R F Buffett
PMCID: PMC353317  PMID: 225519

Abstract

Five clones of the lymphatic leukemia virus 334C were isolated by a procedure designed to maintain homogeneity of the clones. Three of these induced leukemia in mice with the time course of the uncloned parental virus, one induced leukemia with a delayed time course, and one seemed to be biologically inactive. When the clone inducing leukemia most rapidly and the clone inducing leukemia least rapidly were subcloned, the subclones retained the leukemogenicity of the parental clones. The electrophoretic patterns of purified virion proteins and hybridization of viral RNAs with virus-specific DNA suggest that these clones are two closely related variants, not unrelated viruses. Furthermore, in mice infected with these two clones, viral RNA appears in thymuses and spleens at the same time after infection and at nearly the same concentrations. Thus, variations in leukemogenicity can be determined by a genetic property of an ecotropic leukemia virus, and this property is expressed in some manner more subtle than simple control of replication.

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Selected References

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