MOLECULAR-BASIS OF BASE SUBSTITUTION HOTSPOTS IN ESCHERICHIA-COLI

MOLECULAR-BASIS OF BASE SUBSTITUTION HOTSPOTS IN ESCHERICHIA-COLI
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DOI:
10.1038/274775a0
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发表时间:
1978-01-01
期刊:
影响因子:
64.8
通讯作者:
GILBERT, W
GILBERT, W
中科院分区:
综合性期刊1区
文献类型:
--
作者:
COULONDRE, C;MILLER, JH;GILBERT, W

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在大肠杆菌的lacI基因中,自发的碱基置换热点出现在5 - 甲基胞嘧啶残基处。当相应的胞嘧啶未被甲基化时,热点消失。这些热点可能是由5 - 甲基胞嘧啶自发脱氨生成胸腺嘧啶导致的,而胸腺嘧啶不会被DNA - 尿嘧啶糖苷酶切除。
In the lacI gene of E. coli spontaneous base substitution hotspots occur at 5-methylcytosine residues. The hotspots disappear when the respective cytosines are not methylated. The hotspots may result from the spontaneous deamination of 5-methylcytosine to thymine, which is not excised by the enzyme DNA-uracil glycosidase.