Background: Although Multiple Sclerosis (MS) is an autoimmune multifactorial disease with unknown etiology, various genetic and environmental factors are known to contribute to the pathogenesis of the disease.
Objective: Recent studies have confirmed that the suppressive function of regulatory T cells (T (reg)) is impaired in MS patients and that the FOXP3 gene is a crucial transcription factor in the regulation of CD4+CD25+FOXP3+ Treg cells. Polymorphisms in the promoter region of the FOXP3 gene may alter the gene expression level and, therefore, contribute to the disease susceptibility.
Methods: The present study aimed to investigate the possible association between single nucleotide polymorphisms (SNPs) rs3761548 and rs2232365 in the FOXP3 gene and predisposition to MS. We conducted a case-control study on 410 patients with sporadic MS and 446 healthy controls. Genotyping was performed using polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP).
Results: Significant differences in distribution of both rs3761548 and rs2232365 A allele were found in MS patients in comparison to controls. Haplotype frequencies were also different among the studied groups. The A-A and C-G haplotype blocks showed a significant difference between case and controls.
Conclusion: we have provided further evidence for the association between genetic variations and haplotypes in FOXP3 and MS in Iranian population.
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