Chemical and pharmaceutical bulletin p. 801 - 802 (1991)
Update date:2022-08-30
Topics:
Kohda
Sawada
Kawazoe
Treatment of calf thymus deoxyribonucleic acid (DNA) in vitro with a methylating carcinogen, N-methyl-N-nitrosourea (MNU), in phosphate buffer (pH 7.2) resulted in formation of O6,7-dimethylguanine residues in DNA besides the well-known methylated DNA adducts, 7-methylguanine, O6-methylguanine and 3-methyladenine. The product ratio (%) of O6,7-dimethylguanine versus 7-methylguanine was 0.32 after one MNU treatment. The significance of formation of O6,7-dimethylguanine residues in DNA is discussed briefly in relation to the carcinogenicity of MNU.
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