title: Ser326Cys polymorphism in hOGG1 gene and risk of esophageal cancer in a Chinese population.
abstract: Ser326Cys polymorphism in the hOGG1 gene, which is involved in the repair of 8-hydroxyguanine in oxidatively damaged DNA, has been identified and the variant genotype appears to be related to susceptibility to certain cancers. We investigated the association between Ser326Cys polymorphism and squamous-cell carcinoma of the esophagus among a Chinese population. hOGG1 gene polymorphism was detected by PCR-based single-strand conformation polymorphism and DNA sequencing among 201 normal controls and 196 patients with esophageal cancer from Linxian, China, a high-risk area for the disease. The association between this genetic polymorphism and risk of the cancer was examined by a multivariate analysis. We found that the distribution of hOGG1 Ser326Cys genotypes among controls (Ser/Ser, 33.8%; Ser/Cys, 52.8%; and Cys/Cys, 13.4%) was significantly different from that among esophageal cancer cases (39.8%, 38.8% and 21.4%, respectively) (p < 0.05). Homozygosity for the Cys/Cys genotype significantly increased the risk of developing esophageal squamous-cell carcinoma, with the odds ratio (OR) adjusted for age, sex and smoking being 1.9 (95% confidence interval [CI] = 1.3-2.6). Although smoking alone also significantly increased esophageal cancer risk in this case-control study (adjusted OR = 2.6; 95% CI = 1.7-3.9), no significant interaction between smoking and the Cys/Cys genotype was observed in terms of risk. Our results suggest that the hOGG1 326Cys allele might play a role in the carcinogenesis of the esophagus.
authors: Department of Etiology and Carcinogenesis, Cancer Institute, Chinese Academy of Medical Sciences, Beijing 100021, China.
authors: D Y
authors: DY
authors: Xing
authors: W
authors: W
authors: Tan
authors: N
authors: N
authors: Song
authors: D X
authors: DX
authors: Lin
mesh_terms: D019943:Amino Acid Substitution; D044466:Asian People / Q000235:genetics; D003545:Cysteine / Q000235:genetics; D043382:DNA-Formamidopyrimidine Glycosylase; D004938:Esophageal Neoplasms / Q000208:ethnology / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D008875:Middle Aged; D009699:N-Glycosyl Hydrolases / Q000235:genetics*; D011110:Polymorphism, Genetic; D012307:Risk Factors; D012694:Serine / Q000235:genetics
chemical_list: D012694:Serine; D009699:N-Glycosyl Hydrolases; D043382:DNA-Formamidopyrimidine Glycosylase; D003545:Cysteine