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Tuberculosis (TB) is one of the most common infectious diseases in the world.  Mycobacterium tuberculosis  infection leads to pulmonary active disease in approximately 5–10% of exposed individuals. Both bacteria- and host-related characteristics influence latent infection and disease. Host genetic predisposition to develop TB may involve multiple genes and their polymorphisms. It was reported previously that interferon gamma (IFN-  γ  ) and nitric oxide synthase 2 (NOS2) are expressed on alveolar macrophages from TB patients and are responsible for bacilli control; thus, we aimed this study at genotyping single nucleotide polymorphisms  IFNG+874T/A  SNP and  NOS2A-954G/C  SNP to estimate their role on TB susceptibility and determine whether these polymorphisms influence serum nitrite and NO  x    −  production. This case-control study enrolled 172 TB patients and 179 healthy controls. Neither polymorphism was associated with susceptibility to TB.  NOS2A-954G/C  SNP was not associated with serum levels of nitrite and NO  x    − . These results indicate that variants of  IFNG + 874T/A  SNP and  NOS2A-954G/C  SNP do not influence TB susceptibility or the secretion of nitric oxide radicals in the study population.

biomed research international

No Association of<i>IFNG+874T/A</i>SNP and<i>NOS2A-954G/C</i>SNP Variants with Nitric Oxide Radical Serum Levels or Susceptibility to Tuberculosis in a Brazilian Population Subset

No Association ofIFNG+874T/ASNP andNOS2A-954G/CSNP Variants with Nitric Oxide Radical Serum Levels or Susceptibility to Tuberculosis in a Brazilian Population Subset