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. 1981 May;78(5):2918–2922. doi: 10.1073/pnas.78.5.2918

Molecular cloning of integrated simian sarcoma virus: genome organization of infectious DNA clones.

K C Robbins, S G Devare, S A Aaronson
PMCID: PMC319470  PMID: 6265924

Abstract

The integrated form of simian sarcoma virus (SSV) was molecularly cloned in the Charon 16A strain of bacteriophage lambda. In transfection analysis, the recombinant viral DNAs demonstrated the ability to transform cells in tissue culture at high efficiency. Such transformants possessed typical SSV morphology, expressed simian sarcoma associated virus (SSAV) gag gene products in the absence of virus release, and released SSV after superinfection with a type C helper virus. A physical map of the 5.8-kilobase-pair (kbp) recombinant viral DNA clone, deduced from restriction endonuclease analysis, revealed a 5.1-kbp SSV genome containing 0.55-kbp-long terminal repeats flanked by 0.45 and 0.25 kbp of contiguous host cell sequences. By R-loop analysis, the viral DNA molecule contained two regions of homology to SSAV, separated by a 1.0-kbp nonhomologous region. This SSV-specific sequence was shown to be uniquely represented within the normal cellular DNA of diverse mammalian species, including human. Our results demonstrate that this primate transforming retrovirus arose in nature by recombination of a type C helper virus and a host cellular gene.

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