title: Perspectives on mechanisms of gene regulation by 1,25-dihydroxyvitamin D3 and its receptor.
abstract: 1,25-Dihydroxyvitamin D(3) (1,25(OH)(2)D(3)) functions as a systemic signal in vertebrate organisms to control the expression of genes whose products are vital to the maintenance of calcium and phosphorus homeostasis. This regulatory capability is mediated by the vitamin D receptor (VDR) which localizes at DNA sites adjacent to the promoter regions of target genes and initiates the complex events necessary for transcriptional modulation. Recent investigations using chromatin immunoprecipitation techniques combined with various gene scanning methodologies have revealed new insights into the location, structure and function of these regulatory regions. In the studies reported here, we utilized the above techniques to identify key enhancer regions that mediate the actions of vitamin D on the calcium ion channel gene TRPV6, the catabolic bone calcium-mobilizing factor gene RankL and the bone anabolic Wnt signaling pathway co-receptor gene LRP5. We also resolve the mechanism whereby 1,25(OH)(2)D(3) autoregulates the expression of its own receptor. The results identify new features of vitamin D-regulated enhancers, including their locations at gene loci, the structure of the VDR binding sites located within, their modular nature and their functional activity. Our studies suggest that vitamin D enhancers regulate the expression of key target genes by facilitating the recruitment of both the basal transcriptional machinery as well as the protein complexes necessary for altered gene expression.
authors.affiliation: Department of Biochemistry, University of Wisconsin-Madison, 433 Babcock Drive, Madison, WI 53706, USA. pike@biochem.wisc.edu
authors.forename: J Wesley
authors.initials: JW
authors.lastname: Pike
authors.forename: Mark B
authors.initials: MB
authors.lastname: Meyer
authors.forename: Makoto
authors.initials: M
authors.lastname: Watanuki
authors.forename: Sungtae
authors.initials: S
authors.lastname: Kim
authors.forename: Lee A
authors.initials: LA
authors.lastname: Zella
authors.forename: Jackie A
authors.initials: JA
authors.lastname: Fretz
authors.forename: Miwa
authors.initials: M
authors.lastname: Yamazaki
authors.forename: Nirupama K
authors.initials: NK
authors.lastname: Shevde
mesh_terms: D000818:Animals; D001483:Base Sequence; D047369:Chromatin Immunoprecipitation; D017124:Conserved Sequence; D005786:Gene Expression Regulation / Q000235:genetics*; D006657:Histones / Q000378:metabolism; D006801:Humans; D051379:Mice; D020411:Oligonucleotide Array Sequence Analysis; D053245:RANK Ligand / Q000235:genetics; D012319:RNA Polymerase II / Q000235:genetics / Q000378:metabolism; D018167:Receptors, Calcitriol / Q000235:genetics* / Q000378:metabolism*; D020218:Response Elements; D047488:Retinoid X Receptors / Q000235:genetics / Q000378:metabolism; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000378:metabolism
chemical_list: D006657:Histones; D053245:RANK Ligand; D018167:Receptors, Calcitriol; D047488:Retinoid X Receptors; C118756:dihydroxy-vitamin D3; D014807:Vitamin D; D012319:RNA Polymerase II