Vitamin C prevents offspring DNA methylation changes associated with maternal smoking in pregnancy

Lyndsey E. Shorey-Kendrick, Cynthia (Cindy) McEvoy, Betsy Ferguson, Julja Burchard, Byung Park, Lina Gao, Brittany H. Vuylsteke, Kristin F. Milner, Cynthia Morris, Eliot Spindel

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Rationale: Infants whose mothers smoked during pregnancy demonstrate lifelong decreases in pulmonary function. DNA methylation changes associated with maternal smoking during pregnancy have been described in placenta and cord blood at delivery, in fetal lung, and in buccal epithelium and blood during childhood. We demonstrated in a randomized clinical trial (ClinicalTrials.gov identifier, NCT00632476) that vitamin C supplementation to pregnant smokers can lessen the impact of maternal smoking on offspring pulmonary function and decrease the incidence of wheeze at 1 year of age. Objectives: To determine whether vitamin C supplementation reduces changes in offspring methylation in response to maternal smoking and whether methylation at specific CpGs is also associated with respiratory outcomes. Methods: Targeted bisulfite sequencing was performed with a subset of placentas, cord blood samples, and buccal samples collected during the NCT00632476 trial followed by independent validation of selected cord blood differentially methylated regions, using bisulfite amplicon sequencing. Measurements and Main Results: The majority (69.03%) of CpGs with at least 10% methylation difference between placebo and nonsmoker groups were restored (by at least 50%) toward nonsmoker levels with vitamin C treatment. A significant proportion of restored CpGs were associated with phenotypic outcome with greater enrichment among hypomethylated CpGs. Conclusions: We identified a pattern of normalization in DNA methylation by vitamin C supplementation across multiple loci. The consistency of this pattern across tissues and time suggests a systemic and persistent effect on offspring DNA methylation. Further work is necessary to determine how genome-wide changes in DNA methylation may mediate or reflect persistent effects of maternal smoking on lung function.

Original languageEnglish (US)
Pages (from-to)745-755
Number of pages11
JournalAmerican Journal of Respiratory and Critical Care Medicine
Volume196
Issue number6
DOIs
StatePublished - Sep 15 2017

Keywords

  • Ascorbic acid
  • Epigenetics
  • Nicotine
  • Prenatal exposure asthma

ASJC Scopus subject areas

  • Medicine(all)
  • Pulmonary and Respiratory Medicine
  • Critical Care and Intensive Care Medicine

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