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- W2144927195 abstract "AbstractIn eukaryotes, DNA damage induced by ultraviolet light and other agents which distort the helix is removed by nucleotide excision repair (NER) in a fragment ∼25 to 30 nucleotides long. In humans, a deficiency in NER causes xeroderma pigmentosum (XP), characterized by extreme sensitivity to sunlight and a high incidence of skin cancers. Abasic (AP) sites are formed in DNA as a result of spontaneous base loss and from the action of DNA glycosylases involved in base excision repair. In Saccharomyces cerevisiae, AP sites are removed via the action of two class II AP endonucleases, Apn1 and Apn2. Here, we provide evidence for the involvement of NER in the removal of AP sites and show that NER competes with Apn1 and Apn2 in this repair process. Inactivation of NER in the apn1Δ orapn1Δ apn2Δ strain enhances sensitivity to the monofunctional alkylating agent methyl methanesulfonate and leads to further impairment in the cellular ability to remove AP sites. A deficiency in the repair of AP sites may contribute to the internal cancers and progressive neurodegeneration that occur in XP patients. ACKNOWLEDGMENTThis work was supported by grant CA41261 from the NCI, National Institutes of Health." @default.
- W2144927195 created "2016-06-24" @default.
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- W2144927195 date "2000-05-01" @default.
- W2144927195 modified "2023-10-10" @default.
- W2144927195 title "Evidence for the Involvement of Nucleotide Excision Repair in the Removal of Abasic Sites in Yeast" @default.
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- W2144927195 doi "https://doi.org/10.1128/mcb.20.10.3522-3528.2000" @default.
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