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. 1987 Dec;84(24):9103–9107. doi: 10.1073/pnas.84.24.9103

The specificity of UV-induced mutations at an endogenous locus in mammalian cells.

E A Drobetsky 1, A J Grosovsky 1, B W Glickman 1
PMCID: PMC299700  PMID: 3480533

Abstract

We have used a rapid in vivo recombinational method to clone and completely sequence 34 UV-induced mutants at the adenine phosphoribosyltransferase (APRT) locus of Chinese hamster ovary cells. Among the mutants recovered, 26 were single base substitutions including 17 G.C----A.T transitions and a single A.T----G.C transition. Three of the 4 possible transversions accounted for the remaining 8 mutations. The G.C----T.A transversion was not recovered. Six tandem double or closely neighboring double-base substitutions, one double mutation consisting of a G.C----T.A transversion and an adjacent frameshift, as well as one single frameshift mutation were also recovered. UV-induced mutation appears to be targeted to dipyrimidine sites with only two exceptions. These include two double mutations where only one of the base substitutions occurred at a dipyrimidine site. The observed specificity of UV-light-induced mutations at the APRT locus is consistent with the argument that G.C----A.T transitions result primarily from the (6-4) pyrimidine pyrimidone lesion. A striking resemblance in the distribution of UV-induced mutants and a collection of 30 spontaneous mutants identified recently in our laboratory was noted. Both share a common strong site of multiple occurrence and a considerable degree of overlap with respect to site specificity. We speculate therefore that DNA context plays a significant role in mutation fixation in mammalian cells.

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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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