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Transformation of rat cells by an altered polyoma virus genome expressing only the middle-T protein

Nature volume 292, pages 595–600 (1981)Cite this article

Abstract

A modified polyoma virus genome has been constructed which can encode the middle-T protein, but not the large-T or small-T proteins. This was achieved, starting with the full length viral DNA inserted into a plasmid vector, by replacing a small genomic restriction fragment spanning the middle-T intervening sequence with the equivalent fragment from a cloned partial cDNA copy of the middle-T protein mRNA. Transfection of the modified viral DNA into cultured rat cells efficiently induced the formation of transformed cell foci which gave rise to cell lines that grew as tumours after injection into Fisher rats. The only viral early-region antigen synthesized by the cell lines was the middle-T protein. Expression of the middle-T protein is therefore sufficient to establish and maintain a transformed state. The viral mRNA produced by two of the transformed cell lines was structurally indistinguishable from the normal middle-T mRNA found in productively infected cells, suggesting that RNA splicing is not an essential step in the biogenesis of this messenger.

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Authors and Affiliations

  1. Transcription Laboratory, Imperial Cancer Research Fund Laboratories, London, WC2A 3PX, UK

    R. Treisman, U. Novak, J. Favaloro & R. Kamen

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  1. R. Treisman
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  2. U. Novak
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  3. J. Favaloro
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  4. R. Kamen
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Treisman, R., Novak, U., Favaloro, J. et al. Transformation of rat cells by an altered polyoma virus genome expressing only the middle-T protein. Nature 292, 595–600 (1981). https://doi.org/10.1038/292595a0

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