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. 1986 Sep;83(18):6945–6949. doi: 10.1073/pnas.83.18.6945

The C-C (6-4) UV photoproduct is mutagenic in Escherichia coli.

B W Glickman, R M Schaaper, W A Haseltine, R L Dunn, D E Brash
PMCID: PMC386627  PMID: 3529093

Abstract

Mutation induced by ultraviolet light is predominantly targeted by UV photoproducts. Two primary candidates for the premutagenic lesion are the cyclobutane pyrimidine dimer and the less frequent (by a factor of 10) pyrimidine-pyrimidone (6-4) photoproduct. Methylation of the 3'-cytosine in the sequence 5' CCAGG 3' reduces the yield of (6-4) lesions, but not of cyclobutane dimers, at these sites. By taking advantage of mutants deficient in cytosine methylation, we show here that at the three sites in the lacI gene of Escherichia coli having this sequence, the specific increase in the formation of the (6-4) photoproducts is accompanied by a concomitant increase in mutation. At each site, a G X C to A X T transition results in an amber mutation. In the unmethylated state, these sites become among the most frequent nonsense mutations recovered. We conclude that the (6-4) photoproduct constitutes a major premutagenic lesion in E. coli.

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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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