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Department of Clinical Nutrition (K.-i.M., H.Y., Y.T., E.N.,
S.T., Y.I., K.M., E.T.) Tokushima University Tokushima 770,
Japan
Department of Molecular and Cellular Physiology
(R.A.K., J.W.P.) University of Cincinnati Cincinnati, Ohio
45267
The vitamin D receptor (VDR) is known to mediate
the pleiotropic biological actions of 1,25-dihydroxyvitamin
D3 through its ability to modulate the
expression of target genes. The regulation of this ligand-activated
cellular transcription factor is reported to occur at both
transcriptional and posttranslational levels. To begin to address the
molecular basis by which the VDR gene is regulated transcriptionally,
we report here an initial characterization of the human VDR gene and
its promoter. We isolated several overlapping
-phage and cosmid
clones that cover more than 100 kb of human DNA and contained the
entire VDR gene. The gene is comprised of 11 exons that, together with
intervening introns, span approximately 75 kb. The noncoding 5'-end of
the gene includes exons 1A, 1B, and 1C. Eight additional exons (exons
29) encode the structural portion of the VDR gene product. While
primer extension and S1 nuclease-mapping studies reveal several common
transcriptional start sites, three unique mRNA species are produced as
a result of the differential splicing of exons 1B and 1C. The DNA
sequence lying upstream of exon 1A is GC rich and does not contain an
apparent TATA box. Several potential binding sites for the
transcription factor SP1 and other activators are evident. Fusion of
DNA fragments containing putative promoter sequences upstream of the
luciferase structural gene followed by transient transfection of these
plasmids into several mammalian cell lines resulted in significant
reporter activity. Due to the size and complexity of the 5'-end of the
VDR gene, we examined the activity of a DNA fragment surrounding exon
1C. An intron fragment 3' of exon 1C conferred retinoic acid
responsivity when fused to a reporter gene plasmid, suggesting a
molecular mechanism for the previously observed ability of retinoic
acid to induce the VDR. The recovery of the gene for the human VDR will
enable further studies on the transcriptional regulation of this gene.
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