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. 1978 Dec;28(3):972–991. doi: 10.1128/jvi.28.3.972-991.1978

Nucleotide sequence relationships between the genomes of an endogenous and an exogenous avian tumor virus.

J M Coffin, M Champion, F Chabot
PMCID: PMC525821  PMID: 215788

Abstract

We have used mapping of large T1 oligonucleotides to examine the genome of Rous-associated virus-O (RAV-O), an endogenous virus of chickens, and to compare it with that of Prague strain Rous sarcoma virus, subgroup B, (Pr-RSV-B), an exogenous sarcoma virus. To extend the sensitivity of such comparisons, we have developed a system of nucleic acid hybridization and hybridization-competition combined with fingerprinting. This method allows us to estimate the relative degree of relatedness of various portions of the viral genomes. From the results of this study, we have concluded that the genomes of Pr-RSV-B and RAV-O are related in the following way. The 5'-terminal half of the genomes (corresponding to the gag and pol regions) is virtually identical, with only scattered single nucleotide differences. This region is followed by a region comprising 25 to 30% of the genome (the env region) which contains substantial nucleotide sequence differences, most or all of which are due to single base changes. The env-coding region can be further subdivided into three regions: a more variable region probably containing sequences coding for subgroup specificity, flanked by relatively common sequences on each side. To the 3' side of the env region, the RAV-O genome contains a very short sequence not found in Pr-RSV-B, whereas the Pr-RSV-B genome contains a much longer unrelated sequence. The central portion of this sequence comprises the src gene as defined by transformation-defective mutants. Particularly striking is the absence, in the RAV-O genome, of any nucleotide sequence related to the "c region" found very near the 3' end of all exogenous tumor viruses. Both the Pr-RSV-B and RAV-O genomes contain the identical terminally redundant sequence of 21 nucleotides near each end of the genome.

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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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