Genetic polymorphisms in interleukin-6 and interleukin-1-beta were associated with dental caries and gingivitis.

OBJECTIVE: Evaluate the association between single nucleotide polymorphisms (SNPs) in Interleukin-6 ( IL-6 ) gene (rs1800795) and in Interleukin-1-beta ( IL-1β ) gene (rs1143627 and rs1143629) with dental caries and gingivitis in Brazilian children.

MATERIAL AND METHODS: Three hundred and fifty-three children aged 8-11 years were included. Visible biofilm and gingival bleeding were evaluated by Community Periodontal Index. The International System for Detection and Assessment of Carious Lesions (ICDAS) was used to investigate dental caries. Real-time PCR evaluated SNPs in the DNA. Chi-square test, haplotype analysis and logistic regression were applied (alpha of 5%).

RESULTS: The GG genotype in rs1800795 ( IL-6 ) decreases the risk of gingivitis in a co-dominant model ( p  = .05; OR = 0.64). The GG genotype in rs1143627 ( IL-1β ) reduces the risk of dental caries (Co-dominant model: ICDAS0 versus ICDAS1-6 : p  = .05; OR = 0.55. ICDAS0-2 versus ICDAS3-6 : p  = .02; OR = 0.49. Recessive model: ICDAS0 versus ICDAS1-6 : p  = .005; OR = 0.48. ICDAS0-2 versus ICDAS3-6 : p  = .004; OR = 0.45. Logistic regression: ICDAS0-2 versus ICDAS3-6 : p  = .05; OR = 0.24; CI 95%= 0.05-1.00). The GG genotype in rs1143629 was more frequent in ICDAS0 ( p  = .05; OR: 0.60). In the haplotype analysis, IL-1β was associated with gingivitis.

CONCLUSION: The rs1800795 in IL-6 gene was associated with gingivitis. The rs1143627 and rs1143629 in IL-1β were associated with dental caries and gingivitis.