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KMID : 0364219760190040179
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Korean Journal of Zoology
1976 Volume.19 No. 4 p.179 ~ p.186
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Studies on the Chemical Nutagen-induced DNA Repair Synthesis in Relation to Chromosome Exchanges
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Park Sang-Dai
Um Kyung-Il
Choi Kyung-Hee
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Abstract
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DNA repari synthesis and chromosome aberrations induced by various concentrations of alkylating agents (MMS, MNNG, MMC) in cultured human lymphocytes and HeLa $S_3$ cells were studied to determine the possibility of correlation between these two types of biological phenomena, and the results obtained were as follows: DNA repair synthesis was detected in MMC, MNNG and MMS treated HeLa $S_3$ cells at the concentrations of $3 \\times 10^{-7}M, 1 \\times 10^{-6}M, 5 \\times 10^{-4}M$, respectively. These results indicate that MMC is the most potent mutagen followed by MNNG, and MMS is the least potent among these three types of alkylating agents. MMC and MNNG did not show any significant increases of DNA repair synthesis as dose increased, while MMS did. Chromosome aberrations induced by MMC in human lymphocytes was increased as dose increased, but not chromosome exchanges. MNNG did not induce any significant amount of chromosome aberrations with doses, and exchanges were not observed in MNNG treated cells. MMS, however, induced both chromosome aberrations and exchanges, and their rates were increased as dose increased. These results suggest that DNA repair synthesis induced by these alklating agents may not be directly related to the production of chromosome aberrations and exchanges.
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