Association between vitamin D receptor polymorphisms and haplotypes with pulmonary tuberculosis

Area of Science:

• Immunogenetics
• Molecular Biology
• Infectious Diseases

Background:

• The vitamin D receptor (VDR) plays a crucial role in modulating immune responses, particularly in infectious diseases.
• Genetic variations in the VDR gene may influence an individual's susceptibility to various infections, including tuberculosis.

Purpose of the Study:

• To investigate the association between specific polymorphisms in the vitamin D receptor (VDR) gene and the risk of developing pulmonary tuberculosis (PTB).

Main Methods:

• A case-control study involving 120 PTB patients and 131 healthy controls.
• Genetic analysis utilizing polymerase chain reaction and restriction fragment length polymorphism (RFLP) to examine VDR gene polymorphisms (Fok1, Taq1, Bsm1).

Main Results:

• The VDR Fok1 Ff genotype was significantly associated with PTB, showing a two-fold increased risk.
• A higher frequency of the 'f' allele within the Fok1 polymorphism was observed in PTB patients, suggesting it as a risk factor.
• No significant associations were found between VDR Taq1 or Bsm1 polymorphisms and PTB susceptibility.
• Haplotype analysis indicated that the f-T-B and f-t-b haplotypes (combining Fok1, Taq1, and Bsm1) may increase PTB susceptibility.

Conclusions:

• The VDR Fok1 Ff genotype and the 'f' allele are associated with increased susceptibility to pulmonary tuberculosis.
• Specific VDR haplotypes, namely f-T-B and f-t-b, may also contribute to PTB susceptibility, warranting further investigation.