| Background: During the last decade, several studies have evaluated the potential association between
vitamin D receptor (VDR) gene polymorphism and susceptibility to asthma. In spite of valuable findings, the
results are still contradictory. Therefore, a comprehensive meta-analysis not only solves discrepancies but
provides a clue for future projects.
Objective: This meta-analysis was performed to identify whether VDR gene polymorphisms (FokI
(rs2228570) or TaqI (rs731236) or BsmI (rs1544410) or ApaI (rs7975232)) play a role in the risk of asthma.
Methods: Electronic search of Web of Science, Scopus, and PubMed databases were systematically conducted
from their inception until June 2019, to identify all published studies. Eligibility of the studies was
confirmed by precise inclusion and exclusion criteria, and the resultant studies were analyzed.
Results: A total of 17 studies concerning VDR gene polymorphisms and asthma risk were included in this
meta-analysis. The results of pooled analysis indicated a statistically significant association between FokI SNP
(dominant model [OR ¼ 0.78, 95% CI, 0.62-0.98, random effect model] and allelic model [OR ¼ 0.81, 95% CI,
0.67-0.98, random effect model]) and TaqI SNP (homozygote contract model [OR ¼ 0.70, 95% CI, 0.54-0.89])
with asthma risk. Moreover, subgroup analysis showed that ethnicity influences asthma risk in Asian, African,
and American populations. The sensitivity analyses confirmed the stability of the results.
Conclusion: This meta-analysis suggests that VDR gene polymorphism is associated with the risk of asthma.
2019 American College of Allergy, Asthma & Immunology. Published by Elsevier Inc. All rights reserved. |