VDR is a gene that encodes for a protein which acts as a receptor vitamin D, which regulates bone development and calcium absorption. A variant of the gene (rs2228570 FokI polymorphism) is associated with a decreased bone mineral density among white prepubescent girls.
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 controlled by the reciprocal pattern and the temporal on-and-off occupancy of VDRE between the two components. It is also influenced by chromosomal location and binding preferences for specific hormones. Microarray studies of human cells show 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 dataroom (VDR) could be a repository of information and documents relevant to legal, business transactions or other processes. Viewing, downloading or printing are restricted. It is accessed via a central computer as well as an extranet which is a restricted-access Internet virtual data rooms for business connection that allows users to access the internet at set times.
Companies involved in investment banking and in mergers and acquisitions are among the most common users of a VDR. They must be able to share information in a transparent manner with potential investors or buyers. Due diligence will also require a significant amount of data. Life science companies also make use of VDRs for everything from clinical trial results to HIPAA compliance documentation.