Identification of a 1,25-dihydroxyvitamin D3-response element in the 5'-flanking region of the rat calbindin D-9k gene.
The rat calbindin D-9k gene is transcriptionally regulated by 1,25-dihydroxyvitamin D3 in the intestine. We have examined the 5'-flanking region of this gene and identified a 1,25-dihydroxyvitamin D3-responsive element (DRE) between nucleotides -489 and -445. This element confers 1,25-dihydroxyvitamin D3 responsiveness through its native promoter and the heterologous thymidine kinase promoter, and it contains the sequence GGGTGTCGGAAGCCC, which is homologous to the other previously identified DREs. Incubation of this element with the 1,25-dihydroxyvitamin D3 receptor produced a specific protein-DNA complex, which shifted to a higher molecular weight form upon the addition of a monoclonal antibody specific to the 1,25-dihydroxyvitamin D3 receptor. Therefore, the 5'-flanking region of the rat calbindin D-9k gene contains a DRE that mediates the enhanced expression of this gene by 1,25-dihydroxyvitamin D3 in the intestine.
Darwish
H M
HM
Department of Biochemistry, University of Wisconsin-Madison 53706.
DeLuca
H F
HF
D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D064026:Calbindins; D002117:Calcitriol / Q000502:physiology*; D004252:DNA Mutational Analysis; D004268:DNA-Binding Proteins / Q000502:physiology; D005786:Gene Expression Regulation; D008969:Molecular Sequence Data; D051381:Rats; D018167:Receptors, Calcitriol; D011987:Receptors, Steroid / Q000502:physiology*; D012045:Regulatory Sequences, Nucleic Acid; D064030:S100 Calcium Binding Protein G / Q000235:genetics*; D014158:Transcription, Genetic
D064026:Calbindins; D004268:DNA-Binding Proteins; D018167:Receptors, Calcitriol; D011987:Receptors, Steroid; D064030:S100 Calcium Binding Protein G; D002117:Calcitriol