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. 1982 Feb;41(2):489–500. doi: 10.1128/jvi.41.2.489-500.1982

McDonough feline sarcoma virus: characterization of the molecularly cloned provirus and its feline oncogene (v-fms).

L Donner, L A Fedele, C F Garon, S J Anderson, C J Sherr
PMCID: PMC256777  PMID: 6281462

Abstract

The genetic structure of the McDonough strain of feline sarcoma virus (SM-FeSV) was deduced by analysis of molecularly cloned, transforming proviral DNA. The 8.2-kilobase pair SM-FeSV provirus is longer than those of other feline sarcoma viruses and contains a transforming gene (v-fms) flanked by sequences derived from feline leukemia virus. The order of genes with respect to viral RNA is 5'-gag-fms-env-3', in which the entire feline leukemia virus env gene and an almost complete gag sequence are represented. Transfection of NIH/3T3 cells with cloned SM-FeSV proviral DNA induced foci of morphologically transformed cells which expressed SM-FeSV gene products and contained rescuable sarcoma viral genomes. Cells transformed by viral infection or after transfection with cloned proviral DNA expressed the polyprotein (P170gag-fms) characteristic of the SM-FeSV strain. Two proteolytic cleavage products (P120fms and pp55gag) were also found in immunoprecipitates from metabolically labeled, transformed cells. An additional polypeptide, detected at comparatively low levels in SM-FeSV transformants, was indistinguishable in size and antigenicity from the envelope precursor (gPr85env) of feline leukemia virus. The complexity of the v-fms gene (3.1 +/- 0.3 kilobase pairs) is approximately twofold greater than the viral oncogene sequences (v-fes) of Snyder-Theilen and Gardner-Arnstein FeSV. By heteroduplex, restriction enzyme, and nucleic acid hybridization analyses, v-fms and v-fes sequences showed no detectable homology to one another. Radiolabeled DNA fragments representing portions of the two viral oncogenes hybridized to different EcoRI and HindIII fragments of normal cat cellular DNA. Cellular sequences related to v-fms (designated c-fms) were much more complex than c-fes and were distributed segmentally over more than 40 kilobase pairs in cat DNA. Comparative structural studies of the molecularly cloned proviruses of Synder-Theilen, Gardner-Arnstein, and SM-FeSV showed that a region of the feline-leukemia virus genome derived from the pol-env junction is represented adjacent to v-onc sequences in each FeSV strain and may have provided sequences preferred for recombination with cellular genes.

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Selected References

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