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. 1976 Jan;17(1):106–113. doi: 10.1128/jvi.17.1.106-113.1976

Ribonucleotide Sequence Homology Among Avian Oncornaviruses

M Shoyab 1, M A Baluda 1
PMCID: PMC515393  PMID: 173876

Abstract

RNA sequence relatedness among avian RNA tumor virus genomes was analyzed by inhibition of DNA-RNA hybrid formation between 3H-labeled 35S viral RNA and an excess of leukemic or normal chicken cell DNA with increasing concentrations of unlabeled 35S viral RNA. The avian viruses tested were Rous associated virus (RAV)-0, avian myeloblastosis virus (AMV), RAV-60, RAV-61, and B-77 sarcoma virus. Hybridization of 3H-labeled 35S AMV RNA with DNA from normal chicken cells was inhibited by unlabeled 35S RAV-0 RNA as efficiently (100%) as by unlabeled AMV RNA. Hybridization between 3H-labeled 35S AMV RNA and DNA from leukemic chicken myeloblasts induced by AMV was suppressed 100 and 68% by unlabeled 35S RNA from AMV and RAV-0, respectively. Hybridization between 3H-labeled RAV-0 and leukemic chicken myeloblast DNA was inhibited 100 and 67% by unlabeled 35S RNA from RAV-0 and AMV, respectively. It appears therefore that the AMV and RAV-0 genomes are 67 to 70% homologous and that AMV hybridizes to RAV-0 like sequences in normal chicken DNA. Hybridization between AMV RNA and leukemic chicken DNA was inhibited 40% by RNA from RAV-60 or RAV-61 and 50% by B-77 RNA. Hybridization between RAV-0 RNA and leukemic chicken DNA was inhibited 80% by RAV-60 or RAV-61 and 70% by B-77 RNA. Hybridization between 3H-labeled 35S RNA from RAV-60 or RAV-61 and leukemic chicken myeloblast DNA was reduced equally by RNA from RAV-60, RAV-61, AMV or RAV-0; this suggests that RNA from RAV-60 and RAV-61 hybridizes with virus-specific sequences in leukemic DNA which are shared by AMV, RAV-0, RAV-60, and RAV-61 RNAs. Hybridization between 3H-labeled 35S RNA from RAV-61 and normal pheasant DNA was inhibited 100% by homologous viral RNA, 22 to 26% by RNA from AMV or RAV-0, and 30 to 33% by RNA from RAV-60 or B-77. Nearly complete inhibition of hybridization between RAV-0 RNA and leukemic chicken DNA by a mixture of AMV and B-77 35S RNAs indicates that the RNA sequences shared by B-77 virus and RAV-0 are different from the sequences shared by AMV and RAV-0. It appears that different avian RNA tumor virus genomes have from 50 to 80% homology in nucleotide sequences and that the degree of hybridization between normal chicken cell DNA and a given viral RNA can be predicted from the homology that exists between the viral RNA tested and RAV-0 RNA.

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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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