Interleukin gene polymorphisms in chronic periodontitis: A case-control study in the Indian population.

OBJECTIVE

The aim of the present study was to investigate the possible association between seven Interleukin (IL) gene polymorphisms and their interaction with the chronic inflammatory oral disease, chronic periodontitis in Indian population.

DESIGN

A total of 357 study subjects (157 with chronic periodontitis and 200 with healthy control) were genotyped for IL1A -889C/T (rs1800587), IL1B -31C/T (rs1143627), IL1B -511A/G (rs16944), IL1B + 3954C/T (rs1143634), IL2 -330 T/G (rs2069762), IL4 -33C/T (rs2070874), IL6 -597 G/A (rs1800797), IL8 -251A/T (rs4073), IL10 -819C/T (rs1800871), IL10 -592A/C (rs1800872) and IL13 -1111C/T (rs1800925). Statistical analysis was performed using the statistical software package SPSS v16. SNPassoc and Multifactor Dimensionality Reduction algorithm v3.0.2.

RESULTS

We found that the statistically significant association of IL1A-889C/T (rs1800587), IL1B -31C/T (rs1143627), IL1B -511A/G (rs16944) and IL1B + 3954C/T (rs1143634) gene polymorphisms with increased susceptibility of chronic periodontitis. The best gene-gene interaction model was IL1B(-31C/T) X IL1B(+3954C/T) X IL10(-819C/T) with 10/10 cross validation consistency. The variant allele of IL1A, IL1B, IL10 and IL13 were seemed to be linked with chronic periodontitis increased susceptibility. The results of this study also indicate that epidemiological factors especially oral habits also play an important role in the development of chronic periodontitis.

CONCLUSIONS

This study concludes IL1A -889C/T (rs1800587), IL1B -31C/T (rs1143627), IL1B -511A/G (rs16944), IL1B + 3954C/T (rs1143634), IL10 -819C/T (rs1800871), IL10 -592A/C (rs1800872) and IL13 -1111C/T (rs1800925) gene polymorphisms are significantly associated with chronic periodontitis. This work also infers that the best interactive model comprised of IL1B and IL10 polymorphisms cumulatively increase the risk of chronic periodontitis.