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• W2023744038 startingPage "169" @default.
• W2023744038 abstract "Identification of higher risk individuals carrying genetic polymorphisms responsible for reduced DNA repair capacity has substantial preventive implications as these individuals could be targeted for cancer prevention. We have conducted a study to assess the predictivity of the OGG1, XRCC1 and XRCC3 genotypes and the in vitro single strand break repair phenotype for the induction of genotoxic effects. At the population level, a significant contribution of the OGG1 genotypes to the in vitro DNA strand break repair capacity was found. At an individual level, the OGG1 variants Ser/Cys and Cys/Cys genotypes showed a slower in vitro DNA repair than the Ser/Ser OGG1genotype. A multivariate analysis performed with genotypes, age, cumulative dose, exposure status and smoking as independent variables indicated that in the control population, repair capacity is influenced by age and OGG1 polymorphisms. In the exposed population, DNA damage is greater in older men and in smokers. Repair capacity is slower in individuals with Ser/Cys or Cys/Cys OGG1 genotypes compared to those with the Ser/Ser OGG1 genotype. Micronuclei (MN) frequencies increased with age and the cumulative dose of γ-rays. Analysis of the total population revealed that genetic polymorphisms in XRCC1 resulted in higher residual DNA (RDNA) values and the Met/Met variant of XRCC3 resulted in an increased frequency of micronuclei. The analysis confirms that MN frequencies are reliable biomarkers for the assessment of genetic effects in workers exposed to ionising radiation (IR). A combined analysis of the three genotypes, OGG1, XRCC1 and XRCC3 polymorphisms is advised in order to assess individual susceptibility to ionising radiation. As an alternative or complement, the in vitro DNA strand break repair phenotype which integrates several repair pathways is recommended. Smokers with OGG1 polymorphisms who are exposed to ionising radiation represent a specific population requiring closer medical surveillance because of their increased mutagenic/carcinogenic risk." @default.
• W2023744038 created "2016-06-24" @default.
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• W2023744038 date "2004-11-01" @default.
• W2023744038 modified "2023-10-01" @default.
• W2023744038 title "Are genetic polymorphisms in OGG1, XRCC1 and XRCC3 genes predictive for the DNA strand break repair phenotype and genotoxicity in workers exposed to low dose ionising radiations?" @default.
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• W2023744038 doi "https://doi.org/10.1016/j.mrfmmm.2004.08.002" @default.
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