title: Genetic polymorphism of hOGG1 and risk of pterygium in Chinese.
abstract: OBJECTIVE
  Ultraviolet irradiation is known to cause oxidative DNA damage and is thought to be a major factor implicated in the pathogenesis of pterygium. The highly mutagenic 8-hydroxy-2'-deoxyguanosine, a marker for the evaluation of photo-oxidative DNA damage, can be repaired by human 8-oxoguanine glycosylase I (hOGG1). A transition of C to G at nucleotide position 1245 in exon 7 of the hOGG1 gene is associated with the substitution of cysteine for serine at codon 326. In this study, we investigated the association of the hOGG1 Ser326Cys polymorphism with pterygium in a Chinese population.
  
  
  METHODS
  In all, 70 patients and 86 controls were enrolled in this study. The Ser326Cys polymorphism was determined by the polymerase chain reaction-restriction fragment-length polymorphism analysis. The association between this genetic polymorphism and risk of pterygium was examined by chi(2)-test and logistic regression.
  
  
  RESULTS
  The allelic frequencies for the Ser and Cys variants of hOGG1 gene were not significantly different between the two groups. However, when compared with Ser/Ser and Ser/Cys genotypes combined, we found that the homozygous Cys/Cys genotype was more prevalent in pterygium patients than controls (P=0.024) with the odds ratio being 2.2 (95% CI: 1.1-4.5). In the pterygium group, the mean age of patients with the Cys/Cys genotype was younger than those with the other two genotypes (P=0.025).
  
  
  CONCLUSIONS
  Our findings suggest that the 1245C --> G transition in exon 7 of the hOGG1 gene, which results in Ser326Cys substitution of the enzyme, might play a role in the susceptibility of humans to pterygium.
authors.affiliation: Institute of Clinical Medicine, National Yang-Ming University, and Department of Ophthalmology, Taoyuan Veterans Hospital, Taiwan, Republic of China.
authors.forename: H-C
authors.initials: HC
authors.lastname: Kau
authors.forename: C-C
authors.initials: CC
authors.lastname: Tsai
authors.forename: W-M
authors.initials: WM
authors.lastname: Hsu
authors.forename: J-H
authors.initials: JH
authors.lastname: Liu
authors.forename: Y-H
authors.initials: YH
authors.lastname: Wei
mesh_terms: D000368:Aged; D044466:Asian People; D045647:DNA Glycosylases / Q000235:genetics*; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D011110:Polymorphism, Genetic; D011625:Pterygium / Q000235:genetics*
chemical_list: D045647:DNA Glycosylases; C479058:oxoguanine glycosylase 1, human