title: Detection of DNA sites damaged by 1-(4-amino-methyl-5-pyrimidinyl)methyl-3-(2-chloroethyl)-3-nitrosourea hydrochloride (ACNU) using a DNA sequencing procedure.
abstract: A DNA sequencing technique was applied to the highly reiterated DNA from HeLa S3 cells in order to detect DNA damage induced by the antitumor drug, 1-(4-amino-2-methyl-5-pyrimidinyl)methyl-3-(2-chloroethyl)-3-nitrosourea hydrochloride (ACNU). A DNA reiterated fragment of 92 base pairs (bp) was isolated by gel electrophoresis after EcoRI and EcoRI restriction endonuclease digestion. In the defined sequence of the 92 bp fragment, ACNU caused damage and modifications primarily at guanine moieties, leading to alkali-labile sites as determined by subsequent piperidine reaction on an extended Maxam-Gilbert sequencing gel. These results indicate that guanine moieties in double-stranded DNA are preferentially vulnerable to ACNU over other base moieties.
mesh_terms: D001483:Base Sequence; D004249:DNA Damage; D004273:DNA, Neoplasm / Q000187:drug effects*; D006367:HeLa Cells / Q000032:analysis; D015376:Nimustine; D009607:Nitrosourea Compounds / Q000494:pharmacology*
chemical_list: D004273:DNA, Neoplasm; D009607:Nitrosourea Compounds; D015376:Nimustine