title: No association between N7-methyldeoxyguanosine and 8-oxodeoxyguanosine levels in human lymphocyte DNA.
abstract: To examine associations between two different classes of DNA damage that can occur through endogenous processes or exogenous exposures such as smoking, N7-methyldeoxyguanosine (N7-MedG) and 8-oxodeoxyguanosine (8-oxodG) levels were measured in lymphocyte DNA from 22 bronchoscopy patients. 8-OxodG and N7-MedG was detected in 100% and 91% of samples, respectively with 8-oxodG levels being approx 20 times higher (mean 8.39+/-3.578-oxodG/10(6)dG versus 0.41+/-0.33 N7-MedG/10(6) dG) which provides an indication of the relative importance of the agents that induce oxidative DNA damage or alkylation damage. The sources of these genotoxic lesions remain to be established but N7-MedG and 8-oxodG levels were not correlated (r(2)<0.01) suggesting that there is no association between alkylating agent and reactive oxygen species exposure, their metabolism and/or the DNA repair processes that can remove this DNA damage.
authors.affiliation: Centre for Occupational and Environmental Health, Division of Epidemiology and Health Sciences, Medical School, University of Manchester, Oxford Road, Manchester, M13 9PT, UK.
authors.forename: Kathryn L
authors.initials: KL
authors.lastname: Harrison
authors.forename: Philip A J
authors.initials: PA
authors.lastname: Crosbie
authors.forename: Raymond M
authors.initials: RM
authors.lastname: Agius
authors.forename: Philip V
authors.initials: PV
authors.lastname: Barber
authors.forename: Mark
authors.initials: M
authors.lastname: Carus
authors.forename: Geoffrey P
authors.initials: GP
authors.lastname: Margison
authors.forename: Andrew C
authors.initials: AC
authors.lastname: Povey
mesh_terms: D000080242:8-Hydroxy-2'-Deoxyguanosine; D000368:Aged; D000369:Aged, 80 and over; D004247:DNA / Q000737:chemistry*; D004249:DNA Damage; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000032:analysis / Q000378:metabolism; D005260:Female; D006801:Humans; D008214:Lymphocytes / Q000166:cytology / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D012907:Smoking
chemical_list: C048746:7-methyl-2-deoxyguanosine; D000080242:8-Hydroxy-2'-Deoxyguanosine; D004247:DNA; D003849:Deoxyguanosine