Vitamin D receptor genetic polymorphisms in severe and recurrent tuberculosis in children

Area of Science:

• Genetics
• Immunology
• Pediatrics

Background:

• Tuberculosis (TB) remains a significant global health challenge, particularly in pediatric populations.
• Genetic factors, including vitamin D receptor (VDR) gene polymorphisms, may influence susceptibility and clinical presentation of TB.
• Understanding these genetic associations can provide insights into TB pathogenesis and inform potential therapeutic strategies.

Purpose of the Study:

• To investigate the association between VDR gene polymorphisms (FokI, TaqI, ApaI, BsmI) and the occurrence of severe and recurrent tuberculosis in children.
• To explore the relationship between specific VDR genotypes and alleles and clinical parameters in pediatric TB patients.

Main Methods:

• A prospective, observational study involving 35 children diagnosed with severe and/or recurrent TB.
• Analysis of blood samples for VDR gene polymorphisms, including FokI, TaqI, ApaI, and BsmI genotypes and alleles.
• Statistical analysis to determine the association between VDR polymorphisms and clinical/laboratory parameters.

Main Results:

• Recurrent TB was observed in 10 children (28.6%), while severe TB affected 26 children (74.3%).
• Absence of FokI polymorphism was associated with recurrent lymph node TB (Odds ratio 3.429).
• The Tt polymorphism of TaqI was associated with the absence of recurrent TB (p=0.04). Severe TB was not significantly associated with any of the studied VDR polymorphisms.

Conclusions:

• The Tt polymorphism of the TaqI gene appears to be protective against recurrent tuberculosis in children.
• Vitamin D receptor gene polymorphisms, specifically FokI, TaqI, ApaI, and BsmI, were not found to be associated with the severity of TB in this pediatric cohort.
• Further research is warranted to elucidate the role of VDR genetics in pediatric TB and its clinical manifestations.