RESUMO
OBJECTIVE: The focus of the current study was to identify if a possible association between NLRP3 (rs4612666) and IL-1B (rs1143634) single-nucleotide polymorphisms (SNPs) may be implicated in the etiopathogenesis of chronic periodontitis (CP) in a Colombian population. DESIGN: One hundred and twenty-four CP subjects and 81 periodontally healthy controls (HC) were recruited. Periodontal status was assessed by criteria based on probing depth, clinical attachment level, extent, and severity of periodontal breakdown. Human genomic DNA was obtained from saliva samples of the study subjects. The polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method was used to identify the NLRP3 (rs4612666) and IL-1B (rs1143634) SNPs. The association of polymorphisms with CP was assessed individually and adjusted for confounding using a multivariate binary logistic regression model. RESULTS: Bivariate analysis showed a weak association between CT genotype of NLRP3 (rs4612666) SNP and CP, however after logistic regression analysis, neither NLRP3 (rs4612666) nor IL-1B (rs1143634) polymorphisms were strongly/independently associated with disease status. Even so, an interaction effect was significantly detected not only among CT/CC genotypes of NLRP3 gene regarding to the age stratum ≥ 48 years, but also between CC genotype of the same gene and smoking habit. CONCLUSION: Although the present results do not support that IL-1B (rs1143634) SNP could be identified as a risk predictor for CP in the present population, the synergistic interaction of the CT/CC genotypes of NLRP3 (rs4612666) SNP with ageing and/or smoking habit potentially might play a significant role in the pathogenic pathways of periodontal disease.
