Differential Combination of Cytokine and Interferon- γ+874 T/A Polymorphisms Determines Disease Severity in Pulmonary Tuberculosis

被引:28
|
作者
Ansari, Ambreen [1 ]
Hasan, Zahra [1 ]
Dawood, Ghaffar [2 ]
Hussain, Rabia [1 ]
机构
[1] Aga Khan Univ, Dept Pathol & Microbiol, Karachi, Pakistan
[2] Masoomeen Trust Hosp, Karachi, Pakistan
来源
PLOS ONE | 2011年 / 6卷 / 11期
关键词
TUMOR-NECROSIS-FACTOR; SINGLE NUCLEOTIDE POLYMORPHISM; GENE POLYMORPHISMS; MYCOBACTERIUM-TUBERCULOSIS; SUSCEPTIBILITY; ASSOCIATION; IFNG+874T/A; RECEPTOR;
D O I
10.1371/journal.pone.0027848
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Background: Mycobacterium tuberculosis infects nearly 1/3 of the world population and this reservoir forms the largest pool from which new cases arise. Among the cytokines, IFN-gamma is a key determinant in protection against tuberculosis. Single nucleotide polymorphisms (SNPs) in IFN-gamma gene (+874 T/A) which determine TT high ((hi)), AA low ((lo)) and TA intermediate ((int)) responder phenotypes have shown variable associations with tuberculosis disease outcome in different ethnic populations. The objective of the current study was to analyze IFN-gamma gene combinations with other IFN-gamma regulating cytokine genes (IL-10, TNF -alpha, IL-6) to see the effect of gene-combinations on disease severity outcome in pulmonary tuberculosis. Methods and Findings: Study groups comprised of pulmonary TB patients stratified according to lung tissue involvement into mild (Pmd = 74) or advance (Pad = 23) lung disease and compared with healthy controls (TBNA = 166). Genotype analysis was carried out using amplification refractory mutation system-PCR (ARMS-PCR). IFN-gamma gene (+874 T/A) functional SNP combinations in TNF alpha (-308 G/A), IL-10 (-1082 A/G) and IL-6 (-174 G/C) were analyzed. Single gene analysis (Pearson chi(2)) showed a dominant association of IFN-gamma TThi genotype (p = 0.001) and T allele (p = 0.001) with mild disease. IFN-gamma(lo) -IL-10(lo) genotype combination was associated with advanced disease (p = 0.002). IFN-gamma(hi) -IL-6(hi) combination was associated with mild disease (p = 0.0005) while IFN-gamma(lo) -IL-6(int) was associated with protection against both forms of pulmonary disease (p = 0.002). Conclusion: Our results show that a limited number of IFN-gamma gene combinations with other cytokine functional SNPs determine the outcome of disease severity in tuberculosis.
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页数:7
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