DNA repair rates mapped along the human PGK1 gene at nucleotide resolution.
The repair of cyclobutane pyrimidine dimers (CPDs), DNA lesions induced by ultraviolet light, was studied at nucleotide resolution. Human fibroblasts were irradiated with ultraviolet light and allowed to repair. The DNA was enzymatically cleaved at the CPDs, and the induced breaks along the promoter and exon 1 of the PGK1 gene were mapped by ligation-mediated polymerase chain reaction. Repair rates within the nontranscribed strand varied as much as 15-fold, depending on nucleotide position. Preferential repair of the transcribed strand began just downstream of the transcription start site but was most pronounced beginning at nucleotide +140 in exon 1. The promoter contained two slowly repaired regions that coincided with two transcription factor binding sites.
Gao
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S
Beckman Research Institute of the City of Hope, Department of Biology, Duarte, CA 91010.
Drouin
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R
Holmquist
G P
GP
D001665:Binding Sites; D002478:Cells, Cultured; D004260:DNA Repair; D005091:Exons; D005796:Genes; D006367:HeLa Cells; D006801:Humans; D007700:Kinetics; D010735:Phosphoglycerate Kinase / Q000235:genetics*; D011401:Promoter Regions, Genetic; D011740:Pyrimidine Dimers / Q000378:metabolism*; D012867:Skin / Q000378:metabolism / Q000528:radiation effects*; D014157:Transcription Factors / Q000378:metabolism; D014158:Transcription, Genetic; D014466:Ultraviolet Rays
D011740:Pyrimidine Dimers; D014157:Transcription Factors; D010735:Phosphoglycerate Kinase