Race/ethnicity-specific association of Vitamin D and global DNA methylation: Cross-sectional and interventional findings

Haidong Zhu, Jigar Bhagatwala, Ying Huang, Norman K. Pollock, Samip Parikh, Anas Raed, Bernard Gutin, Gregory A Harshfield, Yanbin Dong

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Objectives: Understanding of the influence of vitamin D deficiency on epigenome will provide novel insights into the chronic disease risk. We tested our hypotheses that 1) vitamin D deficiency is associated with global hypomethylation and this association may be race/ethnicity dependent; and 2) vitamin D supplementation will increase global DNA methylation level. Methods: A two-stage design, cross-sectional observation followed by a 16 week randomized, doubleblinded, placebo-controlled trial (RCT) of vitamin D3 supplementation, was undertaken. Global DNA methylation level (percentage of 5-methylcytosine, %5-mC) was quantified using leukocyte DNA with the MethylFlash Methylated DNA Quantification kit (Epigentek). Global methylation data was obtained from 454 Caucasians and African Americans (42%) in the observation cohort and 58 African Americans with vitamin D deficiency in the dose responsive RCT. Results: In the cross-sectional study, African Americans had lower %5-mC than Caucasians (P = 0.04). A significant interaction was detected between plasma 25(OH)D and race on %5-mC (P = 0.05), as a positive association was observed between plasma 25(OH)D and %5-mC in African Americans (β = 0.20, p<0.01), but not in Caucasians (β = 0.03, p = 0.62). In the 16-week RCT, a dose-response benefit of vitamin D3 supplementation was observed for % 5-mC, as indicated by a significant linear upward trend (-0.01 ± 0.01%, placebo; 0.11 ± 0.01%, ∼600 IU/day; 0.30 ± 0.01%, ∼2,000 IU/day; and 0.65 ± 0.01%, ∼4,000 IU/day group; P-trend = 0.04). Conclusions: Vitamin D deficiency is associated with global hypomethylation in African Americans. Vitamin D3 supplementation increases global DNA methylation in a dose-response manner in African Americans with vitamin D deficiency.

Original languageEnglish (US)
Article numbere0152849
JournalPloS one
Volume11
Issue number4
DOIs
StatePublished - Apr 2016

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)
  • General

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