What Is VDR?
VDR is a gene that encodes a protein that acts as a receptor vitamin D which regulates bone growth and calcium absorption. A variant of the gene (rs2228570, FokI polymorphism) is associated with a lower bone mineral density in prepubescent girls of white background.
The hnRNP C1/C2 component of the nuclear vitamin D receptor complex interacts with promoter regions of genes that are responsive to 1,25-dihydroxyvitamin D3 and can induce their transcription. The interaction is regulated through the reciprocal pattern and the temporal on-and-off occupancy of VDRE between the two components. It is also affected by chromosomal location and binding preferences for certain hormones. Microarray studies of human cells reveal that more than 100 genes are enriched with VDRE. The VDRE is occupied by transcription repressors in the absence of 1,25-dihydroxyvitamin D3. The 1,25-dihydroxyvitamin D3-VDR complex binds to these genes, resulting in the recruitment of hnRNP C1/C2 and other proteins that can compete with the repressors and initiate transcription.
A virtual data room (VDR) is an online repository for data and documents relevant to business, legal transactions or proceedings with restrictions on viewing printing, downloading, or viewing. It utilizes a central computer as well as an extranet which is a restricted-access Internet connection, to allow users to access the internet at specified times.
VDRs are used most often by investment banks and businesses involved in mergers and acquisitions. They need to be able to communicate information business direction in a clear way with potential investors or buyers. Due diligence procedures can also require a substantial amount of information. Life science companies also use VDRs for everything from clinical trial data to HIPAA documentation for compliance.