MUTAGENIC SPECIFICITY OF N-METHYL-N'-NITRO-N-NITROSOGUANIDINE IN THE GPT GENE ON A CHROMOSOME OF CHINESE-HAMSTER OVARY CELLS AND OF ESCHERICHIA-COLI-CELLS

被引:18
作者
SOCKETT, H [1 ]
ROMAC, S [1 ]
HUTCHINSON, F [1 ]
机构
[1] YALE UNIV,DEPT MOLEC BIOPHYS & BIOCHEM,NEW HAVEN,CT 06511
来源
MOLECULAR & GENERAL GENETICS | 1991年 / 227卷 / 02期
关键词
N-METHYL-N'-NITRO-N-NITROSOGUANIDINE; MUTAGENESIS; CHINESE HAMSTER OVARY; ESCHERICHIA-COLI; DNA REPAIR;
D O I
10.1007/BF00259678
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
DNA base sequence changes induced by N-methyl-N'-nitro-N-nitrosoguanidine (MNNG) mutagenesis have been determined for the Escherichia coli gpt gene stably incorporated in a chromosome of Chinese hamster ovary cells and in the chromosome of both growing and straving E. coli cells, instead of on a plasmid as in most previous studies. In the three cases, nearly all mutations were G:C to A:T transitions, with a 2-to 4-fold higher mutation rate, compared to other sites, at guanines flanked on the 5' side by another guanine. Mutagenic hot spots in these experiments were less prominent than in published results for MNNG mutagenesis of gpt and of other genes. A suggested explanation involves repair of O6meG. At low levels of mutagenic products, most are repaired and even small differences in the repair rates leads to large differences in the relative amounts of residual O6meG at various sites; in contrast, at high levels of mutagenic products there is little effect of repair on the distribution.
引用
收藏
页码:252 / 259
页数:8
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