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. 1982 Jun;42(3):1007–1016. doi: 10.1128/jvi.42.3.1007-1016.1982

Molecular Cloning of the Fujinami Sarcoma Virus Genome and Its Comparison with Sequences of Other Related Transforming Viruses

Masabumi Shibuya 1, Lu-Hai Wang 1, Hidesaburo Hanafusa 1
PMCID: PMC256934  PMID: 6284986

Abstract

Full-length proviral DNA of Fujinami sarcoma virus (FSV) of chickens was molecularly cloned and characterized. An analysis of FSV DNA integrated in mammalian cells showed that restriction endonuclease SacI has a single cleavage site on FSV DNA. Unintegrated closed circular FSV DNA obtained from newly infected cells was linearized by digestion with SacI and cloned into λgtWES·λB. The following three different molecules were isolated: FSV-1 (4.4 kilobases [kb]) and FSV-2 (4.7 kb), which appeared to be full-length FSV DNA molecules containing either one or two copies of the long terminal repeat structure, and FSV-3 (6 kb), which consisted of part FSV DNA and part DNA of unknown origin. An analysis of the structure of cloned FSV-1 and FSV-2 DNA molecules by restriction endonuclease mapping and hybridization with appropriate probes showed that about 2.6 kb of the FSV-unique sequence called FSV-fps is located in the middle of the FSV genome and is flanked by helper virus-derived sequences of about 1.3 kb at the 5′ end and 0.5 kb at the 3′ end. The long terminal repeats of FSV were found to have no cleavage site for either EcoRI or PvuI. Upon transfection, both FSV-1 DNA and FSV-2 DNA were able to transform mammalian fibroblasts. Four 32P-labeled DNA fragments derived from different portions of the FSV-fps sequence were used for hybridization to viral RNAs. We found that sequences within the 3′ half of the FSV-fps gene are homologous to RNAs of PRCII avian sarcoma virus and the Snyder-Theilen strain of feline sarcoma virus, both of which were previously shown to contain transforming genes related to FSV-fps. These results suggest that the 3′ portion of the FSV-fps sequence may be crucial for the transforming activity of fps-related oncogenic sequences.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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