Volume 97, Issue 1
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Nontuberculous mycobacteria (NTM) cause significant pulmonary infections in humans. Researchers have reported an association between interferon-gamma receptor-1 (IFN-R1 or IFNGR1) deficiency and susceptibility to NTM, but the relevance of polymorphism within these genes is not yet clear. In this study, a single nucleotide polymorphism (SNP), T to C, at position-56 in NTM patients with pulmonary disease was investigated. Molecular identification of isolates was performed with genes using polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP). Then, the host genomic DNA from confirmed NTM patients ( = 80) and control subjects ( = 80) were screened for SNPs of IFNGR1 (T-56C) by PCR-RFLP. The results indicated that NTM patients had higher TC (26/80; 32.5%) or CC (46/80; 57.5%) genotypes in comparison with control groups (TC genotypes [22/80, 27.5%]; CC genotypes [6/80, 7.5%]) ( < 0.05). In this regard, all the patients infected with rapid-growing (RGM, i.e., and ) had CC genotypes (100%). In contrary, only 50.7% (35/69) of infected patients with slow-growing (i.e., , , and ) had CC genotypes. Thus, patients with CC mutation in IFNGR1 at position-56 are more likely to develop RGM infection. In overall, there is a significant association between SNP of IFNGR1 at position-56 and susceptibility to NTM infection. Based on these data, we propose SNP of IFNGR1 at position-56 as a suitable “biomarker” for identifying populations at higher risk of infection.


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  • Received : 16 Nov 2016
  • Accepted : 03 Feb 2017
  • Published online : 10 Apr 2017

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