Vitamin D receptor gene polymorphism is associated with reduced disability in multiple sclerosis.
2008
Ultraviolet radiation (UVR) may contribute to multiple sclerosis (MS) outcome by a mechanism involving vitamin D and the vitamin D receptor (VDR). In 512 patients with MS duration of 10 or more years, we studied the association of VDR single nucleotide polymorphisms (A/G1229, C/G3444, G/A3944, CC20965, CC30056, F/f30875, C/T48200, T/t65013) with outcome or disability. ff30875 frequency was lower in cases with EDSS ≥ 6.0 than with scores < 6.0 (odds ratio = 0.38, 95% CI = 0.20–0.70). The association of ff30875 with outcome was not mediated by cumulative exposure to UVR as assessed by questionnaire; low exposure (odds ratio = 0.42, 95% CI = 0.14–1.34) and high exposure (odds ratio = 0.34, 95% CI = 0.16–0.73).
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