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• W2783837646 abstract "DNA-protein crosslinks (DPCs) are complex DNA lesions that induce mutagenesis and cell death. DPCs are created by common antitumor drugs, reactive oxygen species, and endogenous aldehydes. Since these agents create other types of DNA damage in addition to DPCs, identification of the mechanisms of DPC repair is challenging. In this study, we created plasmid substrates containing site-specific DPC lesions, as well as plasmids harboring lesions that are selectively repaired by the base excision or nucleotide excision repair (NER) pathways. These substrates were transfected into mammalian cells and a quantitative real-time PCR assay employed to study their repair. This assay revealed that DPC lesions were rapidly repaired in wild-type human and Chinese hamster derived cells, as were plasmids harboring an oxoguanine residue (base excision repair substrate) or cholesterol lesion (NER substrate). Interestingly, the DPC substrate was repaired in human cells nearly three times as efficiently as in Chinese hamster cells (>75% vs ∼25% repair at 8 h post-transfection), while there was no significant species-specific difference in the efficiency with which the cholesterol lesion was repaired (∼60% repair). Experiments revealed that both human and hamster cells deficient in NER due to mutations in the xeroderma pigmentosum A or D genes were five to ten-fold less able to repair the cholesterol and DPC lesions than were wild-type control clones, and that both the global genome and transcription-coupled sub-pathways of NER were capable of repairing DPCs. In addition, analyses using this PCR-based assay revealed that a 4 kDa peptide DNA crosslink was repaired nearly twice as efficiently as was a ∼38 kDa DPC, suggesting that proteolytic degradation of crosslinked proteins occurs during DPC repair. These results highlight the utility of this PCR-based assay to study DNA repair and indicate that the NER machinery rapidly and efficiently repairs plasmid DPC lesions in mammalian cells." @default.
• W2783837646 created "2018-01-26" @default.
• W2783837646 creator A5018738469 @default.
• W2783837646 creator A5057172623 @default.
• W2783837646 date "2018-02-01" @default.
• W2783837646 modified "2023-10-14" @default.
• W2783837646 title "A quantitative PCR-based assay reveals that nucleotide excision repair plays a predominant role in the removal of DNA-protein crosslinks from plasmids transfected into mammalian cells" @default.
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• W2783837646 doi "https://doi.org/10.1016/j.dnarep.2018.01.004" @default.
• W2783837646 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/5811311" @default.
• W2783837646 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29413806" @default.
• W2783837646 hasPublicationYear "2018" @default.
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