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Reference: Haruta N, et al. (2012) Chronic low-dose ultraviolet-induced mutagenesis in nucleotide excision repair-deficient cells. Nucleic Acids Res 40(17):8406-15

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Abstract


UV radiation induces two major types of DNA lesions, cyclobutane pyrimidine dimers (CPDs) and 6-4 pyrimidine-pyrimidine photoproducts, which are both primarily repaired by nucleotide excision repair (NER). Here, we investigated how chronic low-dose UV (CLUV)-induced mutagenesis occurs in rad14? NER-deficient yeast cells, which lack the yeast orthologue of human xeroderma pigmentosum A (XPA). The results show that rad14? cells have a marked increase in CLUV-induced mutations, most of which are C?T transitions in the template strand for transcription. Unexpectedly, many of the CLUV-induced C?T mutations in rad14? cells are dependent on translesion synthesis (TLS) DNA polymerase ?, encoded by RAD30, despite its previously established role in error-free TLS. Furthermore, we demonstrate that deamination of cytosine-containing CPDs contributes to CLUV-induced mutagenesis. Taken together, these results uncover a novel role for Pol? in the induction of C?T transitions through deamination of cytosine-containing CPDs in CLUV-exposed NER deficient cells. More generally, our data suggest that Pol? can act as both an error-free and a mutagenic DNA polymerase, depending on whether the NER pathway is available to efficiently repair damaged templates.

Reference Type
Journal Article | Research Support, Non-U.S. Gov't
Authors
Haruta N, Kubota Y, Hishida T
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