Genetic Polymorphisms ofIFNGandIFNGR1with Latent Tuberculosis Infection

Abstract

Previous studies indicated that single-nucleotide polymorphisms (SNPs) of interferon gamma (IFNG) and IFNG receptor 1 (IFNGR1) may be involved in the pathogenesis of pulmonary tuberculosis (PTB) in different populations. In order to further explore the results in a Chinese Han population, this study was designed to investigate potential associations between the polymorphisms inIFNGandIFNGR1and susceptibility to latent tuberculosis infection (LTBI) and/or PTB in a Chinese Han population. A total of 209 PTB, 173 LTBI, and 183 healthy control subjects (HCS) were enrolled in our study. Genotyping was conducted using an improved multiplex ligase detection reaction (iMLDR). We performed a logistic regression including sex and age as covariates to test the effect of alleles/genotypes on LTBI and/or TB. All six markers studied inIFNGandIFNGR1conformed to the Hardy–Weinberg equilibrium (HWE). TheIFNGrs1861494 was significantly associated with LTBI in recessive model, and the CC+CT genotype decreased risk of LTBI by 50% (P=0.046,OR=0.50, 95%CI: 0.25-0.99). TheIFNGR1rs2234711 was significantly associated with LTBI, and allele A increased the risk of LTBI by 55% (P=0.047,OR=1.55, 95%CI: 1.00-2.40). In the present study, we found thatIFNGandIFNGR1polymorphisms were associated with LTBI.