Vitamin D3 receptor

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The VDR gene at 12q12-q14 codes for the 427 amino acid peptide vitamin D3 receptor. This is a transcription factor that regulates transcription of vitamin D3 sensitive genes via its association with the WINAC complex, a chromatin-remodeling complex. In man 2776 genomic positions can be occupied by the receptor which modulates expression in 229 genes[1]. These genes include those implicated in diseases such as multiple sclerosis (IRF8) and Crohn's disease (PTPN2). Calcitriol binds the homodimer receptor, allowing to to become a heterodimer, formed with retinoid X receptor (RXR)[2]. This then binds specific genomic sequences called vitamin D response elements (VDREs) which act to influence gene transcription.

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