RESUMO
Objective The purpose of this study was to investigate the correlation between single nucleotide polymorphisms (SNP) of Toll-like receptor 9 (TLR9) and tuberculosis in the Chinese Tibetan population . Methods A total of 613 active tubercu-losis patients and 603 healthy controls were enrolled in this case -control study.Two SNPs in TLR9 (rs187084 and rs5743836) were genotyped using the multiplex ligation detection reaction technique .The association of the SNPs with the susceptibility of TB was inves -tigated using logistic regression analysis . Results There was no statistically significant difference in the allele distribution of rs 187084 G/A between the TB patients and the healthy controls (P=0.668) or correlation between the genotype of rs 187084 and the genetic suscepti-bility of TB ( P >0.05).Dominant, recessive and additive models showed no association of this SNP with TB , either (P >0.05). Conclusion The rs187084 polymorphism of TLR9 is not correlated with the genetic susceptibility of tuberculosis in the Chinese Tibetan population.