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A ChIP-seq defined genome-wide map of vitamin D receptor binding: Associations with disease and evolution – Source: Genome Research, Aug 24, 2010

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By SV Ramagopalan, et al. • www.ProHealth.com • August 24, 2010


[Note: to read the free full text of this groundbreaking paper click here and scroll down to the text. Relevance to many conditions is suggested.]

Initially thought to play a restricted role in calcium homeostasis, the pleiotropic actions of vitamin D in biology and their clinical significance are only now becoming apparent. However, the mode of action of vitamin D, through its cognate nuclear vitamin D receptor (VDR), and its contribution to diverse disorders, remain poorly understood.

We determined VDR binding throughout the human genome using chromatin immunoprecipitation followed by massively parallel DNA sequencing (ChIP-seq). After calcitriol stimulation, we identified 2776 genomic positions occupied by the VDR and 229 genes with significant changes in expression in response to vitamin D.

VDR binding sites were significantly enriched near autoimmune and cancer associated genes identified from genome-wide association (GWA) studies.

Notable genes with VDR binding included IRF8, associated with MS, and PTPN2 associated with Crohn's disease and T1D.

Furthermore, a number of single nucleotide polymorphism associations from GWA were located directly within VDR binding intervals, for example, rs13385731 associated with SLE and rs947474 associated with T1D.

We also observed significant enrichment of VDR intervals within regions of positive selection among individuals of Asian and European descent.

ChIP-seq determination of transcription factor binding, in combination with GWA data, provides a powerful approach to further understanding the molecular bases of complex diseases.

Source: Genome Research, Aug 24, 2010. Sreeram V. Ramagopalan SV, Heger A, Berlanga AJ, Maugeri NJ, Lincoln MR, Burrell A, Handunnetthi L, Handel AE, Disanto G, Orton SM, Watson CT, Morahan JM, Giovannoni G, Ponting CP, Ebers GC, Knight JC. Wellcome Trust Centre for Human Genetics, Department of Clinical Neurology, and MRC Functional Genomics Unit, Department of Physiology, Anatomy & Genetics, University of Oxford; John Radcliffe Hospital, Oxford; Blizard Institute of Cell and Molecular Science, Queen Mary University of London, Barts and The London School of Medicine and Dentistry, London, United Kingdom; Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada. [Email: Sreeramr@well.ox.ac.uk]





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