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폐결핵 환자에서 Interleukin-1β와 Interleukin-1 Receptor Antagonist 유전자의 다형성

Polymorphisms of interleukin-1β and interleukin-1 receptor antagonist genes in patients with pulmonary tuberculosis

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배경 : 결핵의 발병에 숙주의 유전적 감수성이 관여한다고 알려져 있다. 본 연구는 Interleukin-1β (IL-1β)와 Interleukin-1 receptor antagonist (IL-1Ra) 유전자 다형성이 폐결핵의 유전적 감수성에 연관있는지를 알아보고자 시행되었다. 방법 : 60명의 약제감수성 폐결핵군, 100명의 다제내성 폐결핵군, 96명의 대조군을 대상으로 IL-1β와 IL-1Ra 유전자 다형성을 중합효소연쇄반응법으로 분석하였다.결과 : IL-1β-511/-31/+3954 유전자형과 대립형질의 빈도는 세군간 의미 있는 차이가 없었다. IL-1Ra*2 이형접합체는 대조군에 비해 약제감수성군(p=0.03, OR=0.26, 95% CI 0.07 to 0.95)과 다제내성군(p=0.008, OR=0.26, 95% CI 0.09 to 0.75)에서 유의하게 감소되었으나 약제감수성군과 다제내성군 사이에는 유의한 차이가 없었다(p=1.00).결론 : IL-1Ra*2 이형접합체는 결핵균에 대한 숙주의 저항성과 연관된 유전인자로 생각되며 이런 결과가 한국인의 유전적 감수성을 반영하는 것인지에 대해선 추가 연구가 필요할 것으로 사료된다.

Abstract

Background : Several lines of evidence suggest that host genetic factors influence the outcome of exposure to Mycobacterium tuberculosis. The aim of this study was to determine whether polymorphisms in interleukin-1β (IL-1β) and Interleukin-1 receptor antagonist (IL-1Ra) genes associate with the susceptibility or resistance to pulmonary tuberculosis in Korean. Methods : IL-1β and IL-1Ra gene polymorphism were investigated in 60 drug sensitive (DS) and 100 multidrug-resistant (MDR) pulmonary tuberculosis cases, and 96 healthy controls. IL-1β- 511/-31/+3954 and IL-1Ra genotype were determined by polymerase chain reaction. Results : Allelic and genotypic frequencies of IL-1β-511/-31/+3954 showed no significant difference in 3 groups. IL-1Ra allele 2 heterozygotes were less frequent in DS (p=0.03, OR=0.26, 95% CI 0.07 to 0.95) and MDR tuberculosis (p=0.008, OR=0.26, 95% CI 0.09 to 0.75) than controls, but there was no significant difference between DS and MDR tuberculosis (p=1.00). Conclusion : IL-1Ra allele 2 heterozygote may be associated with resistance to pulmonary tuberculosis in Korean. Further studies will be required to confirm whether these results are of biologic significance

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