Primary vitamin D receptor target genes as biomarkers for the vitamin D3 status in the hematopoietic system.

Wilfinger J, Seuter S, Tuomainen TP, Virtanen JK, Voutilainen S, Nurmi T, de Mello VD, Uusitupa M, Carlberg C

Vitamin D3 belongs to the few nutritional compounds that has, via the binding of its metabolite 1α,25-dihydroxyvitamin D3 (1,25(OH)2D3) to the transcription factor vitamin D receptor (VDR), a direct effect on gene regulation. The relation of thousands of genomic VDR-binding sites to a few hundred primary 1,25(OH)2D3 target genes is still largely unresolved. We studied chromatin domains containing genes for the adhesion molecules CD97 and LRRC8A, the glucose transporter SLC37A2 and the coactivator NRIP1. These domains vary significantly in size (7.3 to 956 kb) but contain each one major VDR-binding site. In monocytic cells these four sites are associated with open chromatin and occupied by VDR, while in macrophage-like cells only the sites of LRRC8A, SLC37A2 and NRIP1 are accessible and receptor bound. The VDR site of CD97 does, in contrast to the three other loci, not carry any DR3-type binding sequence. CD97, LRRC8A, SLC37A2 and NRIP1 are early responding 1,25(OH)2D3 target genes in monocytic cells, while in macrophage-like cells they respond less and, in part, delayed. In primary human peripheral blood mononuclear cells from 71 prediabetic subjects of a vitamin D3 intervention study (VitDmet) CD97, LRRC8A, SLC37A2 and NRIP1 can be used as transcriptomic biomarkers for classifying human individuals for their possible benefit from vitamin D3 supplementation. In particular, NRIP1 exceeds the potential of the previously identified marker CD14 by more than 40% and seems to be a well-suited molecular marker for the vitamin D3 status in the hematopoietic system.

Chromatin Shearing
Bioruptor Plus

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April, 2014



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