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dc.creatorBusch, Robert
dc.creatorQiu, Weiliang
dc.creatorLasky-Su, Jessica
dc.creatorMorrow, Jarrett D.
dc.creatorCriner, Gerard
dc.creatorDeMeo, Dawn L.
dc.identifier.citationBusch, R., Qiu, W., Lasky-Su, J. et al. Differential DNA methylation marks and gene comethylation of COPD in African-Americans with COPD exacerbations. Respir Res 17, 143 (2016).
dc.description.abstractBackground: Chronic obstructive pulmonary disease (COPD) is the third-leading cause of death worldwide. Identifying COPD-associated DNA methylation marks in African-Americans may contribute to our understanding of racial disparities in COPD susceptibility. We determined differentially methylated genes and co-methylation network modules associated with COPD in African-Americans recruited during exacerbations of COPD and smoking controls from the Pennsylvania Study of Chronic Obstructive Pulmonary Exacerbations (PA-SCOPE) cohort. Methods: We assessed DNA methylation from whole blood samples in 362 African-American smokers in the PA-SCOPE cohort using the Illumina Infinium HumanMethylation27 BeadChip Array. Final analysis included 19302 CpG probes annotated to the nearest gene transcript after quality control. We tested methylation associations with COPD case-control status using mixed linear models. Weighted gene comethylation networks were constructed using weighted gene coexpression network analysis (WGCNA) and network modules were analyzed for association with COPD. Results: There were five differentially methylated CpG probes significantly associated with COPD among African-Americans at an FDR less than 5 %, and seven additional probes that approached significance at an FDR less than 10 %. The top ranked gene association was MAML1, which has been shown to affect NOTCH-dependent angiogenesis in murine lung. Network modeling yielded the “yellow” and “blue” comethylation modules which were significantly associated with COPD (p-value 4 × 10-10 and 4 × 10-9, respectively). The yellow module was enriched for gene sets related to inflammatory pathways known to be relevant to COPD. The blue module contained the top ranked genes in the concurrent differential methylation analysis (FXYD1/LGI4, gene significance p-value 1.2 × 10-26; MAML1, p-value 2.0 × 10-26; CD72, p-value 2.1 × 10-25; and LPO, p-value 7.2 × 10-25), and was significantly associated with lung development processes in Gene Ontology gene-set enrichment analysis. Conclusion: We identified 12 differentially methylated CpG sites associated with COPD that mapped to biologically plausible genes. Network module comethylation patterns have identified candidate genes that may be contributing to racial differences in COPD susceptibility and severity. COPD-associated comethylation modules contained genes previously associated with lung disease and inflammation and recapitulated known COPD-associated genes. The genes implicated by differential methylation and WGCNA analysis may provide mechanistic targets contributing to COPD susceptibility, exacerbations, and outcomes among African-Americans.
dc.format.extent15 pages
dc.relation.ispartofFaculty/ Researcher Works
dc.relation.haspartRespiratory Research, Vol. 17
dc.rightsAttribution CC BY
dc.subjectChronic obstructive pulmonary disease
dc.subjectDNA methylation
dc.subjectWeighted gene coexpression network analysis
dc.titleDifferential DNA methylation marks and gene comethylation of COPD in African-Americans with COPD exacerbations
dc.type.genreJournal article
dc.contributor.groupTemple Lung Center (Temple University)
dc.description.departmentThoracic Medicine and Surgery
dc.ada.noteFor Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact
dc.description.schoolcollegeLewis Katz School of Medicine
dc.temple.creatorCriner, Gerard J.

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