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• W2144688016 endingPage "2544" @default.
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• W2144688016 abstract "Psoralens are mutagenic compounds of vegetable origin that are used as photosensitizing agents in the treatment of various skin diseases, blood cell cancer, and autoimmune disorders. To study the mechanism of mutagenicity of psoralens in humans, we examined the efficiency and fidelity of simian virus 40 origin-dependent replication in a human cell extract of M13mp2 DNA randomly treated with the psoralen derivative 4'-hydroxymethyl-4,5',8-trimethyl psoralen plus UVA irradiation. Replication of DNA treated with variable amounts of 4'-hydroxymethyl-4,5',8-trimethyl psoralen and a fixed UVA fluence was inhibited in a concentration-dependent manner. However, covalently closed monomer-length circular replication products were observed. Product analysis by renaturing agarose gel electrophoresis after cross-linking with 250- to 280-nm UV light indicated that approximately 1 of 9 psoralen monoadducts was bypassed during in vitro replication. Introduction of product DNA into Escherichia coli to score replication errors in the lacZalpha reporter gene demonstrated that replication of the damaged DNA was more mutagenic than was replication of undamaged DNA. Sequence analysis of lacZ mutants revealed that damage-dependent replication errors were predominantly T.A-->C.G transitions, transversions at C.G base pairs, and deletions of single A.T base pairs, the last occurring most frequently in homopolymeric runs. A comparison of error specificities with two substrates having the replication origin asymmetrically placed on opposite sides of the mutational target suggests that the lagging-strand replication apparatus is less accurate than the leading-strand replication apparatus for psoralen monoadduct-dependent deletion errors. A model is proposed based on the preferential loopout of the monoadducted base from the strand that templates retrograde discontinuous synthesis." @default.
• W2144688016 created "2016-06-24" @default.
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• W2144688016 date "1996-05-01" @default.
• W2144688016 modified "2023-09-26" @default.
• W2144688016 title "Strand specificity of mutagenic bypass replication of DNA containing psoralen monoadducts in a human cell extract" @default.
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• W2144688016 doi "https://doi.org/10.1128/mcb.16.5.2537" @default.
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