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- W2098581690 abstract "Purpose: To characterize inter- and intra-individual differences in X-ray-induced DNA strand break rejoining kinetics in human peripheral white blood cells (WBC) obtained from 10 healthy volunteers. Materials and methods: The alkaline and neutral versions of the comet assay were used to measure the rate of rejoining of predominantly single-strand breaks (ssb) following exposure to 8 Gy and double-strand breaks (dsb) following 75 Gy. Results: All cells within a population responded in a similar fashion to induction of ssb and dsb; however, a subset of the WBC appeared to rejoin ssb more rapidly. For the 10 individuals examined, the percentage of ssb rejoined by the rapid component(s) was 47 16% and the rejoining half-time for the slow component was 1.3 0.4 h. By 24 h after 8 Gy, 4.9 3.8% of the initial ssb remained. For dsb rejoining, 58 11% of the initial damage was still present 4 h after 75 Gy and by 24 h 32% of the initial level of damage was still detected. Heavily damaged cells present 24 h after 75 Gy varied from 4% to 50% and were excluded from the analysis of repair rates. Conclusions: Inter-individual variability exceeded intra-individual variability for 2 of 4 endpoints examined for ssb repair, but not for dsb repair. It was concluded that DNA damage measured using the comet assay could identify a range in the X-ray repair responses of WBC from different normal individuals. Whether these differences correlate with differences in cell killing by radiation remains to be determined." @default.
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- W2098581690 date "1998-01-01" @default.
- W2098581690 modified "2023-10-17" @default.
- W2098581690 title "Rejoining of DNA single- and double-strand breaks in human white blood cells exposed to ionizing radiation" @default.
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- W2098581690 doi "https://doi.org/10.1080/095530098141906" @default.
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