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Title: Peripheral blood gene expression profiles in COPD subjects
Authors: Soumyaroop Bhattacharya
Shivraj Tyagi
Sorachai Srisuma
Dawn L. DeMeo
Steven D. Shapiro
Raphael Bueno
Edwin K. Silverman
John J. Reilly
Thomas J. Mariani
University of Rochester Medical Center
Brigham and Women's Hospital
Mahidol University
University of Pittsburgh Medical Center
Keywords: Medicine
Issue Date: 24-Apr-2011
Citation: Journal of Clinical Bioinformatics. Vol.1, No.1 (2011)
Abstract: To identify non-invasive gene expression markers for chronic obstructive pulmonary disease (COPD), we performed genome-wide expression profiling of peripheral blood samples from 12 subjects with significant airflow obstruction and an equal number of non-obstructed controls. RNA was isolated from Peripheral Blood Mononuclear Cells (PBMCs) and gene expression was assessed using Affymetrix U133 Plus 2.0 arrays.Tests for gene expression changes that discriminate between COPD cases (FEV 1 < 70% predicted, FEV 1 /FVC < 0.7) and controls (FEV 1 > 80% predicted, FEV 1 /FVC > 0.7) were performed using Significance Analysis of Microarrays (SAM) and Bayesian Analysis of Differential Gene Expression (BADGE). Using either test at high stringency (SAM median FDR = 0 or BADGE p < 0.01) we identified differential expression for 45 known genes. Correlation of gene expression with lung function measurements (FEV 1 & FEV 1 /FVC), using both Pearson and Spearman correlation coefficients (p < 0.05), identified a set of 86 genes. A total of 16 markers showed evidence of significant correlation (p < 0.05) with quantitative traits and differential expression between cases and controls. We further compared our peripheral gene expression markers with those we previously identified from lung tissue of the same cohort. Two genes, RP9and NAPE-PLD, were identified as decreased in COPD cases compared to controls in both lung tissue and blood. These results contribute to our understanding of gene expression changes in the peripheral blood of patients with COPD and may provide insight into potential mechanisms involved in the disease. © 2011 Bhattacharya et al; licensee BioMed Central Ltd.
ISSN: 20439113
Appears in Collections:Scopus 2011-2015

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