Formation of S-formyl-2'-deoxycytidine from 5-methyl-2'-deoxycytidine in duplex DNA by Fenton-type reactions and -irradiation

Autor:	Yoshihito Ueno, Naoko Murata-Kamiya, Akira Matsuda, Hiroyuki Kamiya, Hiroshi Kaji, Hiroshi Kasai, Naoko Karino
Rok vydání:	1999
Předmět:	chemistry.chemical_classification Methylation Biology Ascorbic acid Molecular biology genomic DNA chemistry.chemical_compound Enzyme chemistry CpG site Genetics Deoxycytidine Thymidine DNA
Zdroj:	Nucleic Acids Research. 27:4385-4390
ISSN:	1362-4962 0305-1048
DOI:	10.1093/nar/27.22.4385
Popis:	5-methyl-2'-deoxycytidine (5-Me-dC) is formed by the enzymatic methylation of dC, primarily in CpG sequences in DNA, and is involved in the regulation of gene expression. In the present study, 5-Me-dC and double-stranded DNA fragments containing 5-Me-dC were either gamma-irradiated or aerobically treated with Fenton-type reagents, Fe(II)-EDTA, Fe(II)-nitrilotriacetic acid, Fe(III)-EDTA-H(2)O(2)-catechol or ascorbic acid-H(2)O(2) under neutral conditions. The formation of 5-formyl-2'-deoxycytidine (5-CHO-dC) was observed upon treatment of both 5-Me-dC and DNA fragments containing 5-Me-dC. The yields of 5-CHO-dC from 5-Me-dC and those of 5-formyl-2'-deoxyuridine from dT were comparable. These results suggest that 5-Me-dC in DNA is as susceptible to oxidation as dT in cells, and raise the possibility that 5-CHO-dC may contribute to the high mutagenic rate observed in CpG sequences in genomic DNA.
Databáze:	OpenAIRE
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