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. 1977 Oct;24(1):47–63. doi: 10.1128/jvi.24.1.47-63.1977

Size and Genetic Content of Viral RNAs in Avian Oncovirus-Infected Cells

William S Hayward 1
PMCID: PMC515909  PMID: 198585

Abstract

Viral complementary DNA (cDNA) sequences corresponding to the gag, pol, env, src, and c regions of the Rous sarcoma virus genome were selected by hybridizing viral cDNA to RNA from viruses that lack the env or src gene or to polyadenylic acid [poly(A)]-containing RNA fragments of different lengths and isolating either hybridized or unhybridized DNA. The specificities, genetic complexities, and map locations of the selected cDNA's were shown to be in good agreement with the size and map locations of the corresponding viral genes. Analyses of virus-specific RNA, using the specific cDNA's as molecular probes, demonstrated that oncovirus-infected cells contained genome-length (30-40S) RNA plus either one or two species of subgenome-length viral RNA. The size and genetic content of these RNAs varied, depending on the genetic makeup of the infecting virus, but in each case the smaller RNAs contained only sequences located near the 3′ end of the viral genome. Three RNA species were detected in Schmidt-Ruppin Rous sarcoma virus-infected cells: 39S (genome-length) RNA; 28S RNA, with an apparent sequence of env-src-c-poly(A); and 21S RNA, with an apparent sequence of src-c-poly(A). Cells infected with the Bryan high-titer strain of Rous sarcoma virus, which lacks the env gene, contained genome-length (35S) RNA and 21S src-specific RNA, but not the 28S RNA species. Leukosis virus-infected cells contained two detectable RNA species: 35S (genome-length) RNA and 21S RNA, with apparent sequence env-c-poly(A). Since gag and pol sequences were detected only in genome-length RNAs, it seems likely that the full-length transcripts function as mRNA for these two genes. The 28S and 21S RNAs could be the active messengers for the env and src genes. Analyses of sequence homologies among nucleic acids of different avian oncoviruses demonstrated substantial similarities within most of the genetic regions of these viruses. However, the “common” region of Rous-associated virus-0, an endogenous virus, was found to differ significantly from that of the other viruses tested.

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Selected References

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