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. 1983 Oct;80(19):5832–5836. doi: 10.1073/pnas.80.19.5832

The transforming function of bovine papillomavirus DNA.

Y Nakabayashi, S K Chattopadhyay, D R Lowy
PMCID: PMC390169  PMID: 6310595

Abstract

When bovine papillomavirus (BPV) or its 7.9-kilobase full viral DNA genome induces focal transformation of mouse cells, the viral DNA is maintained in the transformed cells as multiple episomal copies. This transforming capacity and maintenance of the episomal state previously has been localized to a 69% subgenomic fragment of the viral DNA genome. We now have characterized further the BPV DNA sequences that can encode the transforming function. We first created a series of BPV DNA deletion mutants and correlated the location of the deletions with the capacity of the deleted viral DNAs to induce transformation of mouse cells. The results indicated that two discontinuous segments of the viral DNA were required for transformation. One segment, near the 5' end of the 69% transforming fragment, probably represents a control element of the viral DNA. The second segment, which lies within the 3' end of the 69% fragment, encodes transforming sequences of the viral DNA; ligation of a retroviral control element (the long terminal repeat DNA of Harvey murine sarcoma virus) to the 2.3-kilobase segment at the 3' end of the 69% fragment induces transformation of mouse cells. In contrast to mouse cells transformed by the full-length BPV DNA genome, the cells transformed by the deleted BPV DNA genomes contained few viral DNA copies; at least some copies appeared to be integrated. We conclude that different viral functions mediate cellular transformation and maintain the viral DNA in its episomal state.

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Selected References

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