Vitamin D Receptor Gene Polymorphism and the Risk of Multiple Sclerosis in the Azeri Population of Iran.

BACKGROUND

Multiple sclerosis (MS), a disease of the central nervous system (CNS), is associated with damage to the myelin sheath of neurons. It is demonstrated that vitamin D deficiency plays an important role in the development of the disease. Binding of vitamin D to its specific nuclear receptors is a way to exert its function.

OBJECTIVE

Possible correlation between the vitamin D receptor (VDR) gene and MS was evaluated in the Azeri population of Iran.

METHODS

Different genotypes of the Bsml site were determined by using the PCR-RFLP method in 148 MS patients and 220 non-relative healthy controls.

RESULTS

In MS patients, genotype bb was significantly higher than the healthy controls (p<0.05). Additionally, most subjects of the MS group had been insufficiently exposed to sunlight before the age of 15 (p<0.001). Our findings indicated that the red meat intake in MS patients was significantly higher than the healthy controls (p<0.001). In addition, the healthy controls had appropriate dieting behaviors in comparison to MS patients (excessive intake of some foods) (p=0.0001).

CONCLUSION

In conclusion, genotype BB and sufficient exposure to sunlight before the age of 15 were the protective factors against MS. Although, excessive consumption of red meat and inappropriate dieting behaviors were predisposing factors to MS disease.