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. 1985 Jun;54(3):864–868. doi: 10.1128/jvi.54.3.864-868.1985

Contribution of the gag and pol sequences to the leukemogenicity of Friend murine leukemia virus.

A Oliff, M D McKinney, O Agranovsky
PMCID: PMC254876  PMID: 3999195

Abstract

Friend murine leukemia virus (F-MuLV) is a highly leukemogenic replication-competent murine retrovirus. Both the F-MuLV envelope gene and the long terminal repeat (LTR) contribute to its pathogenic phenotype (A. Oliff, K. Signorelli, and L. Collins, J. Virol. 51:788-794, 1984). To determine whether the F-MuLV gag and pol genes also possess sequences that affect leukemogenicity, we generated recombinant viruses between the F-MuLV gag and pol genes and two other murine retroviruses, amphotrophic clone 4070 (Ampho) and Friend mink cell focus-inducing virus (Fr-MCF). The F-MuLV gag and pol genes were molecularly cloned on a 5.8-kilobase-pair DNA fragment. This 5.8-kilobase-pair F-MuLV DNA was joined to the Ampho envelope gene and LTR creating a hybrid viral DNA, F/A E+L. A second hybrid viral DNA, F/Fr ENV, was made by joining the 5.8-kilobase-pair F-MuLV DNA to the Fr-MCF envelope gene plus the F-MuLV LTR. F/A E+L and F/Fr ENV DNAs generated recombinant viruses upon transfection into NIH 3T3 cells. F/A E+L virus (F-MuLV gag and pol, Ampho env and LTR) induced leukemia in 20% of NIH Swiss mice after 6 months. Ampho-infected mice did not develop leukemia. F/Fr ENV virus (F-MuLV gag and pol, Fr-MCV env, F-MuLV LTR) induced leukemia in 46% of mice after 3 months. Recombinant viruses containing the Ampho gag and pol, Fr-MCF env, and F-MuLV LTR caused leukemia in 38% of mice after 6 months. We conclude that the F-MuLV gag and pol genes contain sequences that contribute to the pathogenicity of murine retroviruses. These sequences can convert a nonpathogenic virus into a leukemia-causing virus or increase the pathogenicity of viruses that are already leukemogenic.

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Selected References

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