Association between polymorphic variation in VDR and RXRA and circulating levels of vitamin D metabolites.

Hibler EA, Jurutka PW, Egan JB, Hu C, LeRoy EC, Martinez ME, Thompson PA, Jacobs ET
J Steroid Biochem Mol Biol. 2010 121 (1-2): 438-41

PMID: 20307661 · PMCID: PMC2906637 · DOI:10.1016/j.jsbmb.2010.03.052

The vitamin D metabolite 1,25(OH)2D is the bioactive ligand of the vitamin D receptor (VDR). VDR forms a heterodimer with the retinoid X receptors (RXRs) that when bound to ligand influences the transcriptional control of genes that regulate circulating levels of vitamin D metabolites. Whether genetic variation in VDR or RXRA affects circulating levels of 1,25(OH)2D or 25(OH)D has not been established. We used a single nucleotide polymorphism (SNP) tagging approach to evaluate the association between SNPs in VDR and RXRA and serum levels of 1,25(OH)2D and 25(OH)D. A total of 42 tagSNPs in VDR and 32 in RXRA were analyzed in a sample of 415 participants. Principal components analyses revealed a gene-level association between RXRA and serum 1,25(OH)2D concentrations (P=0.01), but not 25(OH)D. No gene-level association was found for VDR with either serum biomarker. At the single-SNP level, a significant positive trend was observed for increasing 1,25(OH)2D levels with each additional copy of the A allele for RXRA SNP rs9409929 (P-trend=0.003). After a multiple comparisons adjustment, no individual SNP in VDR or RXRA was significantly associated with either outcome. These results demonstrate an association between genetic variation in RXRA and 1,25(OH)2D serum concentrations.

Copyright (c) 2010 Elsevier Ltd. All rights reserved.

MeSH Terms (15)

Biomarkers Calcifediol Calcitriol Genetic Variation Genotype Humans Models, Biological Models, Genetic Polymorphism, Genetic Polymorphism, Single Nucleotide Principal Component Analysis Receptors, Calcitriol Retinoid X Receptor alpha Transcription, Genetic Vitamin D

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