Vitamin D fortification of the innate immune system can be limited by 15 genes
Key Vitamin D Target Genes with Functions in the Immune System
by Oona Koivisto ,Andrea Hanel and Carsten Carlberg
School of Medicine, Institute of Biomedicine, University of Eastern Finland, FI-70211 Kuopio, Finland
Nutrients 2020, 12(4), 1140; https://doi.org/10.3390/nu12041140
(This article belongs to the Special Issue Vitamin D on Immune Function) the only one as of April 2020
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The biologically active form of vitamin D3, 1α,25-dihydroxyvitamin D3 (1,25(OH)2D3), modulates innate and adaptive immunity via genes regulated by the transcription factor vitamin D receptor (VDR). In order to identify the key vitamin D target genes involved in these processes, transcriptome-wide datasets were compared, which were obtained from a human monocytic cell line (THP-1) and peripheral blood mononuclear cells (PBMCs) treated in vitro by 1,25(OH)2D3, filtered using different approaches, as well as from PBMCs of individuals supplemented with a vitamin D3 bolus. The led to the genes ACVRL1, CAMP, CD14, CD93, CEBPB, FN1, MAPK13, NINJ1, LILRB4, LRRC25, SEMA6B, SRGN, THBD, THEMIS2 and TREM1 . Public epigenome- and transcriptome-wide data from THP-1 cells were used to characterize these genes based on the level of their VDR-driven enhancers as well as the level of the dynamics of their mRNA production. Both types of datasets allowed the categorization of the vitamin D target genes into three groups according to their role in
(i) acute response to infection,
(ii) infection in general and
(iii) autoimmunity.
In conclusion, 15 genes were identified as major mediators of the action of vitamin D in innate and adaptive immunity and their individual functions are explained based on different gene regulatory scenarios.
From the PDF

Figure 5. Functional profile of key immune-related vitamin D target genes.
Schematic picture of a cell indicating the main location of the proteins encoded by the 15 key genes.
The information is based on GeneCards (www.genecards.org) and publications cited in the text.
The classification of the proteins (group 1: orange, group 2: green, group 3: blue) is based on their transcriptome profile (Figure 4).
The main immune-related function of the protein groups is indicated inred.