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BMC Medical Genetics
Published in: BMC Medical Genetics 1/2011

Open Access 01-12-2011 | Research article

Vitamin D binding protein variants associate with asthma susceptibility in the Chinese han population

Authors: Fei Li, Lei Jiang, Saffron A Willis-Owen, Youming Zhang, Jinming Gao

Published in: BMC Medical Genetics | Issue 1/2011

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Abstract

Background

Asthma is a genetically heterogeneous disease. Polymorphisms of genes encoding components of the vitamin D pathway have been reported to associate with the risk of asthma. We have previously demonstrated that vitamin D status was associated with lung function in Chinese asthma patients. In this study, we tested whether polymorphisms of genes encoding for vitamin D receptor (VDR), vitamin D 25-hydroxylase (CYP2R1) and vitamin D binding protein (GC) were associated with asthma in the Chinese Han population.

Methods

We sequenced all 8 exons of VDR and all 5 exons of CYP2R1 in a Chinese case-control cohort of asthma consisting of 467 cases and 288 unrelated healthy controls. Two mutations were identified in these regions. These variants were specified as rs2228570 in exon 2 of VDR and rs12794714 in exon 1 of CYP2R1. We also genotyped two common polymorphisms in GC gene (rs4588 and rs7041) by a PCR-restriction fragment length polymorphism (RFLP) method. We analyzed the association between these 4 polymorphisms and asthma susceptibility and asthma-related traits.

Results

Polymorphic markers in VDR and CYP2R1 were not associated with asthma in the Chinese Han cohort. Importantly, variants in GC gene, which give rise to the two most common electrophoretic isoforms of the vitamin D binding protein, were associated with asthma susceptibility. Compared with isoform Gc1, Gc2 was significantly associated with the risk of asthma (OR = 1.35, 95% CI = 1.01-1.78 p = 0.006).

Conclusions

The results provide supporting evidence for association between GC variants and asthma susceptibility in the Chinese Han population.
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Metadata
Title
Vitamin D binding protein variants associate with asthma susceptibility in the Chinese han population
Authors
Fei Li
Lei Jiang
Saffron A Willis-Owen
Youming Zhang
Jinming Gao
Publication date
01-12-2011
Publisher
BioMed Central
Published in
BMC Medical Genetics / Issue 1/2011
Electronic ISSN: 1471-2350
DOI
https://doi.org/10.1186/1471-2350-12-103

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