title: General method for quantifying base adducts in specific mammalian genes.
abstract: A general method has been developed to measure the formation and removal of DNA adducts in defined sequences of mammalian genomes. Adducted genomic DNA is digested with an appropriate restriction enzyme, treated with Escherichia coli UvrABC excision nuclease (ABC excinuclease), subjected to alkaline gel electrophoresis, and probed for specific sequences by Southern hybridization. The ABC excinuclease incises DNA containing bulky adducts and thus reduces the intensity of the full-length fragments in Southern hybridization in proportion to the number of adducts present in the probed sequence. This method is similar to that developed by Bohr et al. [Bohr, V. A., Smith, C. A., Okumoto, D. S. & Hanawalt, P. C. (1985) Cell 40, 359-369] for quantifying pyrimidine dimers by using T4 endonuclease V. Because of the wide substrate range of ABC exinuclease, however, our method can be used to quantify a large variety of DNA adducts in specific genomic sequences.
authors.affiliation: Department of Biochemistry, University of North Carolina School of Medicine, Chapel Hill 27599-7260.
authors.forename: D C
authors.initials: DC
authors.lastname: Thomas
authors.forename: A G
authors.initials: AG
authors.lastname: Morton
authors.forename: V A
authors.initials: VA
authors.lastname: Bohr
authors.forename: A
authors.initials: A
authors.lastname: Sancar
mesh_terms: D015112:4-Nitroquinoline-1-oxide; D000818:Animals; D002460:Cell Line; D002945:Cisplatin; D006224:Cricetinae; D004247:DNA / Q000187:drug effects* / Q000528:radiation effects*; D004249:DNA Damage; D004260:DNA Repair; D004262:DNA Restriction Enzymes; D004706:Endodeoxyribonucleases / Q000378:metabolism*; D029968:Escherichia coli Proteins; D011564:Furocoumarins; D006801:Humans; D009693:Nucleic Acid Hybridization; D014466:Ultraviolet Rays
chemical_list: D029968:Escherichia coli Proteins; D011564:Furocoumarins; D015112:4-Nitroquinoline-1-oxide; D004247:DNA; D004706:Endodeoxyribonucleases; D004262:DNA Restriction Enzymes; C036385:endodeoxyribonuclease uvrABC; D002945:Cisplatin