Interleukin-18 (IL-18) plays a vital role in both innate and acquired immunity. We analysed polymorphisms at -607(C/A) and -137(G/A) in the promoter region of IL-18 gene by allele-specific polymerase chain reaction in normal healthy subjects (n = 173) and patients with pulmonary tuberculosis (n = 165). Allele, genotype and haplotype frequencies did not differ significantly between normal healthy subjects and patients. The results suggest that the IL-18 gene promoter polymorphisms are not associated with susceptibility or resistance to pulmonary tuberculosis in south Indian population of Dravidian descent.
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