Abstract
Aim: Epigenetic changes may occur in response to environmental stressors, and an altered epigenome pattern may represent a stable signature of environmental exposure. Materials & methods: Here, we examined the potential of DNA methylation changes in 910 prediagnostic peripheral blood samples as a marker of exposure to tobacco smoke in a large multinational cohort. Results: We identified 748 CpG sites that were differentially methylated between smokers and nonsmokers, among which we identified novel regionally clustered CpGs associated with active smoking. Importantly, we found a marked reversibility of methylation changes after smoking cessation, although specific genes remained differentially methylated up to 22 years after cessation. Conclusion: Our study has comprehensively cataloged the smoking-associated DNA methylation alterations and showed that these alterations are reversible after smoking cessation.
Original language | English |
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Pages (from-to) | 599-618 |
Number of pages | 20 |
Journal | Epigenomics |
Volume | 8 |
Issue number | 5 |
DOIs | |
Publication status | Published - 1 May 2016 |
Keywords
- DNA methylome
- epigenetic signature
- prospective cohort
- tobacco smoking