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• W2130565570 abstract "Proliferating cell nuclear antigen (PCNA), an auxiliary factor for DNA polymerase delta and epsilon, is involved in both DNA replication and repair. Previous studies in vitro have demonstrated the requirement of PCNA in the resynthesis step of nucleotide excision repair (NER) and base excision repair (BER). Using a native chromatin template isolated under near physiological conditions, we have analysed the involvement of PCNA in the BER pathway in different NER defective human cell lines. The repair sites and PCNA were visualized by indirect immunolabelling followed by fluorescence microscopy. The results indicate that exposure to X-rays triggers the induction of PCNA in all the three human fibroblast cell lines studied, namely normal, xeroderma pigmentosum group A (XP-A) and Cockayne syndrome group B (CS-B). In all the cell lines, induction of PCNA and repair patches occurred in a dose- and time-dependent fashion. Induction of repair patches in NER-deficient XP-A cells suggests that the X-ray-induced lesions are largely repaired via the BER pathway involving PCNA as one of the key components of this pathway. X-ray-induced repair synthesis was greatly inhibited by treatment of cells with DNA polymerase inhibitors aphidicolin and cytosine arabinoside. Interestingly, inhibition of repair resynthesis did not affect the intensity of PCNA staining in X-irradiated cells indicating that the PCNA may be required for the BER pathway at a step preceding the resynthesis step." @default.
• W2130565570 created "2016-06-24" @default.
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• W2130565570 date "2001-05-01" @default.
• W2130565570 modified "2023-09-24" @default.
• W2130565570 title "Analysis of repair and PCNA complex formation induced by ionizing radiation in human fibroblast cell lines" @default.
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• W2130565570 doi "https://doi.org/10.1093/mutage/16.3.225" @default.
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