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Abstract
Vitamin D has been shown to modulate the immune system thereby preventing the development of diabetes in NOD mice. Since the vitamin D binding protein (DBP) is the main transporter for vitamin D and DBP has immunomodulatory properties itself, we investigated three polymorphic sites within the DBP gene as candidates for type 1 diabetes susceptibility for the first time.
152 Caucasian families with at least one affected offspring were genotyped for intron 8 |(TAAA)., repeat| and exon 11 (Haelll, Styl) polymorphisms. Transmission disequilibrium testing was used to detect preferential transmission to affected offspring. We found no significant transmission disequilibrium for DBP alleles. The strongest deviation from expected values was observed for the “10” allele (relative risk = 0.57, transmitted 13 of 36 times (corrected p = 0.249)).
Although we cannot exclude an association of the studied DBP alleles with type 1 diabetes at present, these data do not suggest their contribution to this disease in Germans.