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Licensed Unlicensed Requires Authentication Published by De Gruyter January 11, 2013

Effect of 1 year B and D vitamin supplementation on LINE-1 repetitive element methylation in older subjects

  • Ulrich Hübner EMAIL logo , Jürgen Geisel , Susanne H. Kirsch , Vera Kruse , Marion Bodis , Cosima Klein , Wolfgang Herrmann and Rima Obeid

Abstract

Background: Disturbed DNA methylation is causally related to chronic diseases like cancer and atherosclerosis. B vitamins are cofactors required for methyl group synthesis and may therefore affect DNA methylation. Vitamin D has epigenetic effects. We tested if B and D vitamin supplementation has an effect on genomic long interspersed nuclear element-1 (LINE-1) methylation and the metabolites S-adenosylmethionine (SAM) and S-adenosylhomocysteine (SAH).

Methods: Fifty subjects (median age 68.0 years) were supplemented with a daily oral dose of B vitamins (500 µg folic acid, 500 µg vitamin B12 and 50 mg vitamin B6), 1200 IU vitamin D and 456 mg calcium. Fasting blood samples were collected before and after 1 year of supplementation. LINE-1 methylation was determined in genomic DNA from blood cells as a surrogate for whole genome methylation. In addition, SAM, SAH and total homocysteine (tHcy) were measured in plasma samples.

Results: Plasma homocysteine decreased significantly after supplementation (12.8 vs. 9.1 µmol/L; p<0.05), whereas SAM, SAH, the SAM/SAH ratio and LINE-1 methylation did not change significantly. LINE-1 methylation was not significantly correlated with SAH, homocysteine or B vitamins.

Conclusions: Long-term vitamin B supplementation had no effect on LINE-1 methylation in blood cells nor on plasma levels of SAM and SAH. Vitamin B and D supplementation seems to have no effect on DNA methylation, especially in cases where no severe deficiency exists.


Corresponding author: Dr. Ulrich Hübner, University Hospital of the Saarland, Clinical Chemistry and Laboratory Medicine / Central Laboratory, Building 57, 66421 Homburg, Germany

Conflict of interest statement

Authors’ conflict of interest disclosure: The authors stated that there are no conflicts of interest regarding the publication of this article.

Research funding: No funding was granted for this study.

Honorarium: Honorarium was not received.

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Received: 2012-9-18
Accepted: 2012-12-10
Published Online: 2013-01-11
Published in Print: 2013-03-01

©2013 by Walter de Gruyter Berlin Boston

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