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- W2138460414 abstract "A pulsed field gel electrophoresis technique, asymmetric field inversion gel electrophoresis (AFIGE), was used to evaluate induction by X-rays of DNA damage in CHO cells. The fraction of DNA activity released from the plug (FAR) was used as a measure for the amount of radiation-induced DNA damage, predominantly DNA double-strand breaks (dsb) (Stamato and Denko 1990), and was determined at various stages of growth and phases of the cell cycle in a range of doses between zero and 70 Gy. The FAR per unit dose fluctuated throughout the cell cycle and was high for cells irradiated in G1; it decreased as cells entered S and reached a minimum in the middle of this phase. The FAR per unit dose increased again as cells progressed towards the end of S, and reached values in G2 similar to those measured in G1. When damage was introduced into DNA by means of 125I decay similar fluctuations in the FAR per decay were observed throughout the cell cycle, suggesting that the variations in the FAR per unit of radiation dose observed throughout the cell cycle do not derive from alterations in the induction of dsb. The fluctuations in the FAR per unit dose throughout the cell cycle were quantitatively similar to the fluctuations in the fraction of activity eluted in irradiated cells assayed by the non-unwinding filter elution assay throughout the cycle (Okayasu et al. 1988), and suggest that both techniques respond to similar DNA replication-associated alterations of the biophysical and/or biochemical properties of the DNA molecule. It is concluded that caution needs to be exercised before differences observed in the FAR between different cell lines or between various phases of the cell cycle after exposure to a given dose of radiation are interpreted as suggesting differences in the induction of DNA dsb." @default.
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- W2138460414 date "1991-01-01" @default.
- W2138460414 modified "2023-10-10" @default.
- W2138460414 title "Detection of DNA Double-strand Breaks in Synchronous Cultures of CHO Cells by Means of Asymmetric Field Inversion Gel Electrophoresis" @default.
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- W2138460414 doi "https://doi.org/10.1080/09553009114550311" @default.
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