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Nitric Oxide Synthase 2 (NOS2) Gene Polymorphisms Association With Risk of Pulmonary Tuberculosis (PTB): A

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Genetic variations in the nitric oxide synthase 2 (NOS2) gene influence pulmonary tuberculosis (PTB) risk. Specific NOS2 polymorphisms, rs2297518 and rs1800482, were found to reduce PTB risk, while rs9282799 increased it.

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nitric oxide synthase 2 (NOS2)polymorphismpulmonary tuberculosis (PTB)

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Area of Science:

  • Genetics
  • Immunology
  • Infectious Diseases

Background:

  • Pulmonary tuberculosis (PTB) poses a significant global health threat.
  • Understanding genetic susceptibility to PTB is crucial for effective control.
  • The nitric oxide synthase 2 (NOS2) gene is a potential candidate for influencing PTB risk.

Purpose of the Study:

  • To investigate the association between five specific NOS2 gene polymorphisms (rs7215373, rs2297518, rs2274894, rs1800482, and rs9282799) and the risk of developing PTB.
  • To evaluate the role of these NOS2 polymorphisms in modulating host immune response to Mycobacterium tuberculosis.

Main Methods:

  • A case-control study involving 150 PTB patients and 150 healthy controls.
  • Genotyping of NOS2 polymorphisms using amplification refractory mutation system-polymerase chain reaction (ARMS-PCR).
  • Statistical analysis including logistic regression and Hardy-Weinberg equilibrium tests to assess genetic associations.

Main Results:

  • Polymorphisms rs7215373 and rs2274894 showed no significant association with PTB risk.
  • rs2297518 polymorphism was associated with a reduced risk of PTB (allelic model, p=0.041).
  • rs1800482 polymorphism demonstrated a reduced risk across multiple models (p≤0.043).
  • Conversely, rs9282799 polymorphism was significantly associated with an increased risk of PTB across multiple models (p≤0.012).

Conclusions:

  • Specific NOS2 gene polymorphisms (rs2297518, rs1800482, rs9282799) are associated with varying risks of developing PTB.
  • These findings suggest NOS2 polymorphisms may influence immune responses to Mycobacterium tuberculosis.
  • Further research is needed to explore the mechanisms and potential of these polymorphisms as PTB biomarkers for targeted prevention strategies.