{"title":"Induction of umu gene expression by cross-links and other DNA lesions","authors":"Takeo Ohnishi , Sakae Iwamoto , Kaori Ikai-Tano , Keiichi Nozu","doi":"10.1016/0167-8817(87)90030-7","DOIUrl":null,"url":null,"abstract":"<div><p>The induction of <em>umu</em> gene expression by DNA cross-links was investigated in various strains of <em>E. coli</em> with different DNA-repair capacities. Expression was measured by quantifying enzymatic activity of β-galactosidase produced under regulation of the <em>umu</em> promoter carried on a plasmid carrying the <em>umuC-lacZ</em> gene fusion. The treatment with MMC induced gene expression more efficiently in a wild-type strain when compared with an excision-repair-deficient strain (<em>uvrA</em>). In contrast, PUVA and cis-Pt treatment induced higher levels of the gene expression in the <em>uvrA</em> strain than in the wild-type strain, as did other DNA-damaging agents including 4NQO, MNNG and MMS. None of these chemicals induced <em>umu</em> expression in either <em>lexA</em> and <em>recA</em> strains. The mechanisms of the induction of <em>umu</em> expression by DNA cross-links in relation to DNA damage and repair are discussed.</p></div>","PeriodicalId":100936,"journal":{"name":"Mutation Research/DNA Repair Reports","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1987-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-8817(87)90030-7","citationCount":"8","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mutation Research/DNA Repair Reports","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0167881787900307","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 8
Abstract
The induction of umu gene expression by DNA cross-links was investigated in various strains of E. coli with different DNA-repair capacities. Expression was measured by quantifying enzymatic activity of β-galactosidase produced under regulation of the umu promoter carried on a plasmid carrying the umuC-lacZ gene fusion. The treatment with MMC induced gene expression more efficiently in a wild-type strain when compared with an excision-repair-deficient strain (uvrA). In contrast, PUVA and cis-Pt treatment induced higher levels of the gene expression in the uvrA strain than in the wild-type strain, as did other DNA-damaging agents including 4NQO, MNNG and MMS. None of these chemicals induced umu expression in either lexA and recA strains. The mechanisms of the induction of umu expression by DNA cross-links in relation to DNA damage and repair are discussed.
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