title: MMP-8 -799 C>T genetic polymorphism is associated with the susceptibility to chronic and aggressive periodontitis in Taiwanese.
abstract: OBJECTIVE
  Matrix metalloproteinase (MMP)-8 is a protease that degrades numerous extracellular molecules and has been implicated in the pathogenesis of periodontitis. Polymorphism in the MMP-8 could affect the susceptibility to disease. Our aim was to evaluate the association between periodontitis and MMP-8 -799 C>T polymorphism.
  
  
  METHODS
  Genomic DNA was obtained from 361 chronic periodontitis patients (CP), 96 aggressive periodontitis patients (AgP), and 106 periodontally healthy controls (HC). MMP-8 -799 C>T polymorphism was determined using the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).
  
  
  RESULTS
  The frequencies of genotypes in diseased groups were similar but were significantly different from those in the HC. Multivariate logistic regression analysis with adjustment for age, gender and smoking indicated that increased risks of AgP and CP were associated with the -799 T allele (in AgP, adjusted OR = 1.99, p = 0.04; in CP, adjusted OR = 1.87, p = 0.007). To avoid the confounded effect of smoking on MMP-8 polymorphism to periodontitis, the analysis was conducted on non-smokers and the associations were significant.
  
  
  CONCLUSIONS
  These results suggested that non-smoking Taiwanese with the MMP-8 -799 T allele were associated with the risks of both CP and AgP. Further studies in other ethnic populations are necessary.
authors.affiliation: Division of Periodontics, Department of Dentistry, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.
authors.forename: Yu-Hsiang
authors.initials: YH
authors.lastname: Chou
authors.forename: Ya-Ping
authors.initials: YP
authors.lastname: Ho
authors.forename: Ying-Chu
authors.initials: YC
authors.lastname: Lin
authors.forename: Kai-Fang
authors.initials: KF
authors.lastname: Hu
authors.forename: Yi-Hsin
authors.initials: YH
authors.lastname: Yang
authors.forename: Kun-Yen
authors.initials: KY
authors.lastname: Ho
authors.forename: Yi-Min
authors.initials: YM
authors.lastname: Wu
authors.forename: Edward
authors.initials: E
authors.lastname: Hsi
authors.forename: Chi-Cheng
authors.initials: CC
authors.lastname: Tsai
mesh_terms: D000328:Adult; D010520:Aggressive Periodontitis / Q000208:ethnology / Q000235:genetics*; D044466:Asian People / Q000235:genetics*; D016022:Case-Control Studies; D055113:Chronic Periodontitis / Q000208:ethnology / Q000235:genetics*; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D020784:Matrix Metalloproteinase 8 / Q000235:genetics*; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D012016:Reference Values; D013624:Taiwan
chemical_list: D020784:Matrix Metalloproteinase 8