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This journal is published by the University Library System of the University of Pittsburgh as part  

of its D-Scribe Digital Publishing Program and is cosponsored by the University of Pittsburgh Press. 

 

 

 

 

 

 

 
 

 

Genetic Diversity of IFγ, IL1β, 

TLR2, and TLR8 Loci in Pulmonary 

Tuberculosis in Kazakhstan 

 

Dauren Yerezhepov, Axat 

Zhabagin, Ayken Askapuli, Saule 

Rakhimova, Zhannur Nurkina, 

Aliya Abilmazhinova, Alma 

Akhmetova, Askhat Molkenov, 

Ulykbek Kairov, Ainur Akilzhanova 

 
Center for Life Sciences, Nazarbayev 
University, Astana, Kazakhstan 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Vol. 3, Suppl. (2014)   |   ISSN 2166-7403 (online)    

DOI 10.5195/cajgh.2014.181   |   http://cajgh.pitt.edu 

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YEREZHEPOV 

 

 

This work is licensed under a Creative Commons Attribution 4.0 United States License. 

 

This journal is published by the University Library System of the University of Pittsburgh as part  

of its D-Scribe Digital Publishing Program and is cosponsored by the University of Pittsburgh Press. 

 

Central Asian Journal of Global Health 

Volume 3, Suppl. (2014)  |  ISSN 2166-7403 (online)  |  DOI 10.5195/cajgh.2014.181  |  http://cajgh.pitt.edu 

  

 

Abstract 

Introduction. Tuberculosis (TB) is caused by bacterium Mycobacterium tuberculosis (MTB), and according to the WHO, up to 

30% of world population is infected with latent TB. Pathogenesis of TB is multifactorial, and its development depends on 

environmental, social, microbial, and genetic factors of both the bacterium and the host. The number of TB cases in Kazakhstan 

has decreased in the past decade, but multidrug-resistant (MDR) TB cases are dramatically increasing. Polymorphisms in genes 

responsible for immune response have been associated with TB susceptibility. The objective of this study was to investigate the 

risk of developing pulmonary TB (PTB) associated with polymorphisms in several inflammatory pathway genes among 

Kazakhstani population. 

Methods. 703 participants from 3 regions of Kazakhstan were recruited for a case-control study. 251 participants had pulmonary 

TB (PTB), and 452 were healthy controls (HC). Males and females represented 42.39% and 57.61%, respectively. Of all 

participants, 67.4% were Kazakhs, 22.8% Russians, 3.4% Ukrainians, and 6.4% were of other origins. Clinical and epidemiological 

data were collected from medical records, interviews, and questionnaires. DNA samples were genotyped using TaqMan assay on 

4 polymorphisms: IFNγ (rs2430561) and IL1β (rs16944), TLR2 (rs5743708) and TLR8 (rs3764880). Statistical data was analyzed 

using SPSS 19.  

Results. Genotyping by IFγ, IL1β, TLR2 showed no significant association with PTB susceptibility (p > 0.05). TLR8 genotype 

A/G was significantly higher in females (F/M – 41.5%/1.3%) and G/G in males (M/F – 49%/20.7%) (χ2=161.43, p < 0.001). A 

significantly increased risk of PTB development was observed for TLR A/G with an adjusted OR of 1.48 (95%, CI: 0.96 - 2.28), 

and a protective feature was revealed for TLR8 G/G genotype (OR: 0.81, 95%, CI: 0.56 - 1.16, p = 0.024). Additional grouping by 

gender revealed that TLR8 G/G contributes as protective genotype (OR: 1.83, 95%, CI: 1.18 - 2.83, p = 0.036) in males of the 

control group.  

Conclusion. Results indicate that heterozygous genotype A/G of TLR8 increases the risk of PTB development, while G/G genotype 

may serve as protection mechanism. A/A genotype is strongly associated with susceptibility to PTB. To clarify the role of other 

polymorphisms in susceptibility to PTB in Kazakhstani population, further investigations are needed. 

Keywords: tuberculosis, inflammation polymorphism, Kazakhstan 

 

 

 

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