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- W2000701037 abstract "The region-specific heterogeneity of repairing DNA damage has been established in several biological systems. A flexible and sensitive approach, based upon DNA damage specific antibodies, is described to monitor the repair of specific lesions within discrete genomic segments. Membrane transblotted DNA restriction fragments are immunoanalyzed for the initial formation and repair of 254 nm radiation induced pyrimidine dimers. Sensitivity of dimer immunodetection increases proportional to fragment concentration and size. Antibody binding was detectable in a 0.5 kb fragment obtained from approx. 100 ng of restriction digested phage lambda DNA irradiated with 50 J m-2. Dimers within larger fragments (greater than 5 kb) could be detected at ultraviolet doses as low as 1 to 2 J m-2. To determine the occurrence of preferential repair in prokaryotic cells, damage was assessed in DNA sequences established in various Escherichia coli strains. In vivo repair of 8.9 kb vector and 6.4 and 3.2 kb gene inserts occurred with an approximate t1/2 of 45 min in UvrABC excision repair-proficient strains. Antibody binding sites were retained by DNA within repair-deficient strains. Compared to UvrABC, the repair of DNA fragments mediated by T4 endonuclease V was rapid and complete within 30 min of cellular irradiation. The efficient repair in DenV+ strain is attributable to a highly processive repair enzyme rather than to selective repair of actively replicating target genes. The results demonstrate the exceptional ability of antibodies specific for altered biomolecular lesions to map damage and repair in gene segments episomally established within cells." @default.
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- W2000701037 date "1991-10-01" @default.
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- W2000701037 title "Immunoanalysis of ultraviolet radiation induced DNA damage and repair within specific gene segments of plasmid DNA" @default.
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- W2000701037 doi "https://doi.org/10.1016/0167-4781(91)90101-q" @default.
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