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. 1989 Nov;63(11):4520–4524. doi: 10.1128/jvi.63.11.4520-4524.1989

Respective roles of pyrimidine dimer and pyrimidine (6-4) pyrimidone photoproducts in UV mutagenesis of simian virus 40 DNA in mammalian cells.

F Bourre 1, A Benoit 1, A Sarasin 1
PMCID: PMC251083  PMID: 2552137

Abstract

UV light induces DNA lesions which are mutagenic in mammalian cells. We used simian virus 40 tsB201 (unable to produce viral capsid at the restrictive temperature of 41 degrees C because of a point mutation in the VP1 gene) to analyze the mutagenic potency of the two major UV-induced lesions, pyrimidine dimers (Py-Py) and pyrimidine (6-4) pyrimidones [Py(6-4)Py], which are formed on the same nucleotide sites. The mutagenesis criterion was the reversion toward a wild-type growth phenotype. After UV irradiation (mainly at 254 nm), part of the DNA was treated with the photoreactivating enzyme of Escherichia coli, which monomerizes Py-Py but does not modify the Py(6-4)Py photoproduct. Higher survival and lower mutation frequency rates for the photoreactivated DNA indicated that the two lesions were lethal and mutagenic. The VP1 gene of some mutants was entirely sequenced. The mutation spectra showed that the two lesions did not induce the same mutation hot spots, although some sites were common to both. The induced mutation hot spots were not only correlated with lesion hot spots but seemed partially directed by local DNA structures.

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Selected References

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