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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1981 Jun;78(6):3328–3332. doi: 10.1073/pnas.78.6.3328

Analysis of two divergent rat genomic clones homologous to the transforming gene of Harvey murine sarcoma virus.

D DeFeo, M A Gonda, H A Young, E H Chang, D R Lowy, E M Scolnick, R W Ellis
PMCID: PMC319561  PMID: 6267583

Abstract

Harvey murine sarcoma virus (Ha-MuSV) is a mouse-rat recombinant retrovirus that encodes a protein designated p21, required for virally induced transformation. Using a radiolabeled DNA fragment from the p21 coding region, we have detected homologous DNA sequences in the normal DNA of rats and of several other vertebrate species. Moreover, many tested cells from these species contain low levels of a p21 protein that is highly related to viral 21. Now we report two independent fragments from normal rat DNA containing sequences (sarc) homologous to the Ha-MuSV transforming region that were cloned in the bacteriophage vector Charon 4A. Sarc sequences in the one fragment are completely colinear with the viral sequences and share apparently all restriction endonuclease sites. Sarc sequences in the second fragment have several sets of intervening sequences and lack some restriction endonuclease sites found in the viral transforming region. Despite the presence of these intervening sequences in the second sarc fragment, we have been able to ligate this sarc fragment to the long terminal repeat sequence of HaMuSV and to induce cellular transformation and high levels of p21 expression upon transfection of this DNA to NIH 3T3 mouse cells. These results suggest that elevated levels of p21, normally expressed at low levels in a variety of cells, can induce cellular transformation.

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Selected References

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