Association of A‐197G polymorphism in interleukin‐17 gene with chronic periodontitis: Evidence from six case‐control studies with a computational biology approach

Abstract

Aim The aim of the present study was to evaluate the association of interleukin‐17 (IL‐17) A‐197G gene polymorphism with chronic periodontitis (CP) in a case‐control study, a meta‐analysis, and an in silico approach. Methods In the case‐control study, 122 cases with CP and 126 healthy controls were recruited; IL‐17 A‐197G genotyping was performed by polymerase chain reaction‐restriction fragment length polymorphism. In the meta‐analysis, comprehensive literature retrieval was performed on valid databases to identify relevant studies. Bioinformatics tools were employed to investigate the effects of A‐197G transition on the promoter region of IL‐17. Results Our case‐control study revealed a significant association between IL‐17 A‐197G transition and CP. The overall meta‐analysis revealed significant associations between the IL‐17 A‐197G polymorphism and CP risk in homozygote co‐dominant and recessive models. The stratified analysis also showed a statistically significant association between the mentioned transition and CP risk in the Caucasian population. The in silico analysis revealed that the A‐197G polymorphism could make changes in protein‐binding sites of the IL‐17 promoter region. Conclusions Our study supports that IL‐17 A‐197G transition could be a genetic risk factor for CP. However, further studies with a larger sample size among different ethnicities are required to obtain a more accurate conclusion.

The Genetic Aspects of Periodontitis Pathogenesis and the Regenerative Properties of Stem Cells

“…Moreover, the percentage of mucosal-associated invariant T cells (MAIT) producing IL-17 is higher in PD patients than in controls [51]; thus, the dysregulation of IL-17 could play a role in PD development. Importantly, polymorphisms in the IL-17 gene have been found to impact susceptibility to the disease; for instance, a metaanalysis by Farmohammadi showed that the AA genotype of the A-197G polymorphism has been associated with an increased odds ratio (OR) [52]. Interestingly, particular genetic profiles may influence the presence of pathogenic bacteria.…”