Abstract
POLYOMA, the small DNA animal tumour virus, like the SV40 virus, has attracted interest because its genome is small enough to be analysed at the molecular level1–6, enabling study of the molecular basis of oncogenic transformation. In polyoma virus there are several deletion mutants, designated hr-t (host-range transformation) mutants, which are unable to transform cells (or cause tumours) and which will grow in certain types of cells only, mainly those which have already been transformed. We report here that we have sequenced the region of the DNA which probably determines the non-transforming phenotype of one such hr-t mutant (NG-18)7 and compared it with the sequence of wild-type polyoma virus DNA. These studies show NG-18 to be a frame-shift mutant, and to have lost 187 of the nucleotides present in wild-type DNA, including several nucleotide triplets which code for cysteine.
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SOEDA, E., GRIFFIN, B. Sequences from the genome of a non-transforming mutant of polyoma virus. Nature 276, 294–298 (1978). https://doi.org/10.1038/276294a0
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DOI: https://doi.org/10.1038/276294a0
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