Abstract
Introduction
Several studies have shown a strong correlation between the serum vitamin D level and asthma severity and deficits in lung function.
Objective
Study the relationship between vitamin D and the severity of asthma by targeting five SNPs of vitamin D metabolism gene pathway in a Tunisian adult asthmatics population.
Methods
Our case–control study includes 154 adult asthmatic patients and 154 healthy Tunisian subjects. We genotyped many variants in three human genes encoding key components of the vitamin D metabolism, CYP2R1, CYP27B1, GC. The GC gene rs4588 and rs7041 polymorphisms were analysed using the PCR-RFLP method, while rs10741657 and rs12794714 for CYP2R1 gene and rs10877012 of CYP27B1 gene were investigated using TaqMan PCR genotyping techniques.
Results
We found that the presence of at least one copy of the rs12794714 A, allele was associated with lower risk of developing asthma (OR 0.61). Further, the rs12794714 is a protector factor against asthma severity (OR 0.5). However, the presence of rs10877012 TG genotype is a risk factor related to asthma severity (OR 1.89). When we classified the population according to sex, our results showed that rs10877012 TT genotype was a risk factor for women subjects (OR 6.7). Moreover, the expression of TT genotype was associated with a higher risk of asthma in non-smoker patients (OR 7.13). We found a significant lower VD serum levels in asthmatics than controls but no impact of the polymorphisms on VD levels.
Conclusions
We found that rs12794714 and rs10877012 SNPs were associated with asthma risk.
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Acknowledgements
We are grateful to all contributors who provided data to our team. We especially need to thank EPAR team of Pierre Louis Institute of Epidemiology and Public Health (iPLESP), UMR 1136, Epidemiology of Allergic and Respiratory Diseases (EPAR), Paris, France. And Mr DORGHAM Karim laboratory engineer of: Inserm UMR-S1135, Center for Immunology and Infectious Diseases (CIMI-Paris), Paris, France, AP-HP, Pitié-Salpêtrière Hospital Group, Department of Immunology, Paris, France, CR7, CIMI-Paris, Paris, France.
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Lahmar, O., Salhi, M., Kaabachi, W. et al. Association Between Vitamin D Metabolism Gene Polymorphisms and Risk of Tunisian Adults’ Asthma. Lung 196, 285–295 (2018). https://doi.org/10.1007/s00408-018-0101-2
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DOI: https://doi.org/10.1007/s00408-018-0101-2