Vitamin D receptor ApaI gene polymorphism and tuberculosis susceptibility: a meta-analysis.

Aim: Vitamin D performs its actions through the vitamin D receptor (VDR), which acts as a transcriptional factor. Many case-control studies have been performed in the past to elucidate the association of the ApaI polymorphism of VDR gene and the risk of tuberculosis (TB). However, these studies have shown inconsistent and conflicting results.