DNA repair and chromosomal stability in the alkylating agent-hypersensitive Chinese hamster cell line 27-1 |
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| Affiliation: | 1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education,School of Energy and Environment, Southeast University, Nanjing 210096, PR China;2. College of Electrical, Energy and Power Engineering, Yangzhou University, Yangzhou 225127, PR China;3. School of Mechanical Engineering, Southeast University, Nanjing, Jiangsu, PR China |
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| Abstract: | 27-1 is a mutant of Chinese hamster ovary cells (CHO cells) that is hypersenstivie to the toxic effects of ultraviolet light, N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) and other monofunctional alkylating agents. We show here that the enhanced MNNG sensitivity of these cells is not due to alterations in the amount of DNA methylation products introduced nor by a defect in the first step of removal of the main alkylation products 7-methylguanine and 3-methyladenine. However, these mutant cells perform more DNA repair synthesis after treatment with MNNG than normal CHO-9 cells. This observation might indicate a possible defect of a ligase involved in sealing DNA repair patches.27-1 cells did not show elevated frequencies of sister-chromatid exchange and chromosomal aberration induced by MNNG. The data show that MNNG-induced cell killing is not necessarily related to increased chromosomal instability. |
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