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- W2005128568 abstract "Many studies of radiation response and mutagenesis have been carried out with transformed human or rodent cell lines. To study whether the transfer of results between different cellular systems is justified with regard to the repair of radiation-induced DNA double-strand breaks (DSBs), two assays that measure the joining of correct DSB ends and total rejoining in specific regions of the genome were applied to primary and cancer-derived human cells and a Chinese hamster cell line. The experimental procedure involves Southern hybridization of pulsed-field gel electrophoresis blots and quantitative analysis of specific restriction fragments detected by a single-copy probe. The yield of X-ray-induced DSBs was comparable in all cell lines analyzed, amounting to about 1 x 10(-2) breaks/Mbp/Gy. For joining correct DSB ends following an 80 Gy X-ray exposure all cell lines showed similar kinetics and the same final level of correctly rejoined breaks of about 50%. Analysis of all rejoining events revealed a considerable fraction of unrejoined DSBs (15-20%) after 24 h repair incubation in the tumor cell line, 5-10% unrejoined breaks in CHO cells and complete DSB rejoining in primary human fibroblasts. To study intragenomic heterogeneity of DSB repair, we analyzed the joining of correct and incorrect break ends in regions of different gene density and activity in human cells. A comparison of the region Xq26 spanning the hypoxanthine guanine phosphoribosyl transferase locus with the region 21q21 revealed identical characteristics for the induction and repair of DSBs, suggesting that there are no large variations between Giemsa-light and Giemsa-dark chromosomal bands." @default.
- W2005128568 created "2016-06-24" @default.
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- W2005128568 date "1999-04-01" @default.
- W2005128568 modified "2023-10-17" @default.
- W2005128568 title "Misrejoining of DNA double-strand breaks in primary and transformed human and rodent cells: a comparison between the HPRT region and other genomic locations" @default.
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- W2005128568 doi "https://doi.org/10.1016/s0921-8777(99)00008-7" @default.
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