title: DNA repair gene XRCC1 polymorphisms and the risk of asthma in a Turkish population.
abstract: Polymorphisms have been identified in several DNA damage repair genes. These polymorphisms may effect DNA repair capacity and modulate asthma susceptibility. In this study, we aimed to determine the two polymorphisms in DNA repair gene, x-ray repair cross-complementing group 1 (XRCC1), in a sample of Turkish patients with asthma, and evaluate their association with asthma development. We used polymerase chain reaction (PCR) and restriction fragment length polymorphism (RFLP) to analyze XRCC1 Arg194Trp and XRCC1 Arg399Gln polymorphisms in 116 patients with asthma and in 180 disease-free controls. Our data showed a positive association between the polymorphisms of codons 194 (odds ratio [OR] = 1.97, 95% confidence interval [CI] = 1.06-3.66, and p = 0.03 for Arg/Trp genotype) and 399 (OR = 1.87, 95% CI = 1.12-3.13, and p = 0.02 for Arg/Gln genotype, and OR = 2.59, 95% CI = 1.24-5.43, and p = 0.01 for Gln/Gln genotype) and asthma risk. No statistically significant difference was found for the allelic and genotypic distributions of the polymorphisms in XRCC1 gene between mild and moderate asthmatic patients. A combined analysis of the effect of XRCC1 codons 194 and 399 revealed the highest risk (OR = 4.17, 95% CI = 1.77-9.83, and p = 0.001) for carriers of the polymorphic alleles in both of these codons. These results suggest that the risk of asthma may be associated with DNA repair mechanisms, and understanding these mechanisms will help identify individuals at increased risk of developing asthma and should lead to improved treatment of asthma.
authors.affiliation: Department of Medical Biology, Cerrahpasa Faculty of Medicine, University of Istanbul, 34098, Istanbul, Turkey. bahadirbatar@gmail.com
authors.forename: Bahadir
authors.initials: B
authors.lastname: Batar
authors.forename: Mehmet
authors.initials: M
authors.lastname: Guven
authors.forename: Ilhan
authors.initials: I
authors.lastname: Onaran
authors.forename: Bulent
authors.initials: B
authors.lastname: Tutluoglu
authors.forename: Gonul
authors.initials: G
authors.lastname: Kanigur-Sultuybek
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000483:Alleles; D001249:Asthma / Q000175:diagnosis / Q000235:genetics* / Q000503:physiopathology; D002648:Child; D004260:DNA Repair / Q000235:genetics; D004268:DNA-Binding Proteins / Q000235:genetics*; D018450:Disease Progression; D005260:Female; D005500:Follow-Up Studies; D056726:Genetic Association Studies; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D014421:Turkey; D000076105:X-ray Repair Cross Complementing Protein 1
chemical_list: D004268:DNA-Binding Proteins; D000076105:X-ray Repair Cross Complementing Protein 1; C000619371:XRCC1 protein, human