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From blood to lung tissue: effect of cigarette smoke on DNA methylation and lung function

de Vries, M., van der Plaat, D. A., Nedeljkovic, I., Verkaik-Schakel, R. N., Kooistra, W., Amin, N., van Duijn, C. M., Brandsma, C-A., van Diemen, C. C., Vonk, J. M. & Boezen, H. M., 3-Nov-2018, In : Respiratory Research. 19, 1, 9 p., 212.

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Background: Genetic and environmental factors play a role in the development of COPD. The epigenome, and more specifically DNA methylation, is recognized as important link between these factors. We postulate that DNA methylation is one of the routes by which cigarette smoke influences the development of COPD. In this study, we aim to identify CpG-sites that are associated with cigarette smoke exposure and lung function levels in whole blood and validate these CpG-sites in lung tissue.

Methods: The association between pack years and DNA methylation was studied genome-wide in 658 current smokers with >5 pack years using robust linear regression analysis. Using mediation analysis, we subsequently selected the CpG-sites that were also associated with lung function levels. Significant CpG-sites were validated in lung tissue with pyrosequencing and expression quantitative trait methylation (eQTM) analysis was performed to investigate the association between DNA methylation and gene expression.

Results: 15 CpG-sites were significantly associated with pack years and 10 of these were additionally associated with lung function levels. We validated 5 CpG-sites in lung tissue and found several associations between DNA methylation and gene expression.

Conclusion: This study is the first to validate a panel of CpG-sites that are associated with cigarette smoking and lung function levels in whole blood in the tissue of interest: lung tissue.

Original languageEnglish
Article number212
Number of pages9
JournalRespiratory Research
Volume19
Issue number1
Publication statusPublished - 3-Nov-2018

    Keywords

  • Cigarette smoking, Lung function, DNA methylation, EWAS, Lung tissue, OBSTRUCTIVE PULMONARY-DISEASE, WIDE ASSOCIATION, GENOME, LOCI, CESSATION, EPIGENOME, EXPOSURE, DECLINE, TIME

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