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Epigenome-Wide Association Studies of COPD and Lung Function: A Systematic Review.
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Chronic Obstructive Pulmonary Disease (COPD) results from gene-environment interactions over the lifetime. These interactions are captured by epigenetic changes, such as DNA methylation. This systematic review synthesizes evidence from epigenome-wide association studies (EWAS) related to COPD and lung function. Systematic literature search on PubMed, Embase and CINAHL databases, identified 1947 articles that investigated epigenetic changes associated with COPD/lung function; 17 of them met our eligibility criteria from which data was manually extracted. Differentially methylated positions (DMPs) and/or annotated genes, were considered replicated if identified by ≥2 studies with a p<1 x 10-4. Ten studies profiled DNA methylation changes in blood and 7 in respiratory samples, including surgically resected lung tissue (n=3), small airways epithelial brushings (n=2), bronchoalveolar lavage (n=1) and sputum (n=1). Main results showed: (1) high variability in study design, covariates and effect sizes, which prevented a formal meta-analysis; (2) in blood samples, 51 DMPs were replicated in relation to lung function and 12 related to COPD; (3) in respiratory samples, 42 DMPs were replicated in relation to COPD but none in relation to lung function; and, (4) in COPD vs. control studies, 123 genes (2.6% of total) were shared between ≥1 blood and ≥1 respiratory sample and associated with chronic inflammation, ion transport and coagulation. There is high heterogeneity across published COPD/lung function EWAS studies. A few genes (n=123; 2.6%) were replicated in blood and respiratory samples, suggesting that blood can recapitulate some changes in respiratory tissues. These findings have implications for future research.
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CASAS RECASENS, Sandra, CASSIM, R., MENDOZA BARCO, Nuria, AGUSTÍ GARCÍA-NAVARRO, Àlvar, LODGE, C., LI, S., BUI, D., MARTINO, D., DHARMAGE, S. c., FANER, Rosa. Epigenome-Wide Association Studies of COPD and Lung Function: A Systematic Review.. _American Journal Of Respiratory And Critical Care Medicine_. 2024. Vol. 210, núm. 6, pàgs. 766-778. [consulta: 14 de gener de 2026]. ISSN: 1073-449X. [Disponible a: https://hdl.handle.net/2445/217282]