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01.12.2015 | Research article | Ausgabe 1/2015 Open Access

BMC Pulmonary Medicine 1/2015

Association between toll-like receptors 9 (TLR9) gene polymorphism and risk of pulmonary tuberculosis: meta-analysis

BMC Pulmonary Medicine > Ausgabe 1/2015
Zhi Chen, Wei Wang, Jianqin Liang, Jinhe Wang, Shisheng Feng, Guangyu Zhang
Wichtige Hinweise

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

ZC carried out the study design, data analysis. WW carried out the manuscript review. JL participated in the literature research. JW participated in the literature research. SF participated in the literature research. GZ conceived of the study. All authors read and approved the final manuscript.



Previous studies indicated that the single nucleotide polymorphisms (SNPs) in TLR9 gene might be associated with Tuberculosis (TB) risk. However, the results are inconsistent and inconclusive.


1745 articles from four databases were involved in our study. A meta-analysis on the associations between the seven polymorphisms and TB risk was carried out by comparison using different genetic models.


In this systematic review 8 studies from seven English articles were analyzed. Our results showed that rs352139 is significantly associated with TB risk (AA vs. AG, OR 0.77, 95% CI 0.65-0.92, P = 0.004). In the ethnic subgroup analysis, Indonesians with AA genotype had a decreased susceptibility while Mexicans with GG allele had an increased risk.


The meta-analysis indicated that rs352139 polymorphism might be associated with decreased TB risk in Indonesians whereas increased risk in Mexicans. Whether the observed association was due to causal effect needs to be further studied.
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