Analysis of association between TLR-4 Asp299Gly and Thr399Ile gene polymorphisms and chronic periodontitis in a sample of south Indian population

To analyze the association between TLR-4 Asp299Gly and Thr399Ile gene polymorphisms and chronic periodontitis in a sample of south Indian population. Genomic DNA was obtained from peripheral blood of 60 patients with chronic periodontitis and 60 periodontally healthy subjects. TLR-4 Asp299Gly and Thr399Ile gene polymorphisms were genotyped by a polymerase chain reaction-restriction fragment length polymorphism method. The data were analyzed by a χ(2)-test and by relative risk estimation. Thr399Ile alleles were found in 4% of chronic periodontitis patients and in 1% of periodontally healthy subjects. The prevalence of a Thr399Ile heterozygote was found to be 5% in the chronic periodontitis group and 1.67% in the periodontally healthy group, respectively. Homozygosity for TLR-4 Thr399Ile was seen in chronic periodontitis patients only, which was 1.67%. The TLR-4 Asp299Gly gene polymorphism was not detected in either chronic periodontitis or periodontally healthy groups. There is no significant association between TLR-4 Thr399Ile polymorphism and chronic periodontitis in a sample of south Indian population.