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. 1982 Nov;2(11):1331–1338. doi: 10.1128/mcb.2.11.1331

Sequence comparison in the crossover region of an oncogenic avian retrovirus recombinant and its nononcogenic parent: genetic regions that control growth rate and oncogenic potential.

P N Tsichlis, L Donehower, G Hager, N Zeller, R Malavarca, S Astrin, A M Skalka
PMCID: PMC369937  PMID: 6298596

Abstract

NTRE 7 is an avian retrovirus recombinant of the endogenous nononcogenic Rous-associated virus-0 (RAV-0) and the oncogenic, exogenous, transformation-defective (td) Prague strain of Rous sarcoma virus B (td-PrRSV-B). Oligonucleotide mapping had shown that the recombinant virus is indistinguishable from its RAV-0 parent except for the 3'-end sequences, which were derived from td-PrRSV-B. However, the virus exhibits properties which are typical of an exogenous virus: it grows to high titers in tissue culture, and it is oncogenic in vivo. To accurately define the genetic region responsible for these properties, we determined the nucleotide sequences of the recombinant and its RAV-0 parent by using molecular clones of their DNA. These were compared with sequences already available for PrRSV-C, a virus closely related to the exogenous parent td-PrRSV-B. The results suggested that the crossover event which generated NTRE 7 took place in a region -501 to -401 nucleotides from the 3' end of the td-PrRSV parental genome and that sequences to the right of the recombination region were responsible for its growth properties and oncogenic potential. These sequences included a 148-base-pair exogenous-virus-specific region that was absent from the RAV-0 genome and the U3 region of the long terminal repeat. Since the exogenous-virus-specific sequences are expected to be missing from transformation-defective mutants of the Schmidt-Ruppin strain of RSV, which, like other exogenous viruses, grow to high titers in tissue culture and are oncogenic in vivo, we concluded that the growth properties and oncogenic potential of the exogenous viruses are determined by sequences in the U3 region of the long terminal repeat. However, we propose that the exogenous-virus-specific region may play a role in determining the oncogenic spectrum of a given oncogenic virus.

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Selected References

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