Abstract
Rheumatoid arthritis (RA) is a systemic autoimmune disease. So far, it is unclear whether there exist common RA-related genes shared in different tissues/cells. In this study, we conducted an integrative analysis on multiple datasets to identify potential shared genes that are significant in multiple tissues/cells for RA. Seven microarray gene expression datasets representing various RA-related tissues/cells were downloaded from the Gene Expression Omnibus (GEO). Statistical analyses, testing both marginal and joint effects, were conducted to identify significant genes shared in various samples. Followed-up analyses were conducted on functional annotation clustering analysis, protein-protein interaction (PPI) analysis, gene-based association analysis, and ELISA validation analysis in in-house samples. We identified 18 shared significant genes, which were mainly involved in the immune response and chemokine signaling pathway. Among the 18 genes, eight genes (PPBP, PF4, HLA-F, S100A8, RNASEH2A, P2RY6, JAG2, and PCBP1) interact with known RA genes. Two genes (HLA-F and PCBP1) are significant in gene-based association analysis (P = 1.03E-31, P = 1.30E-2, respectively). Additionally, PCBP1 also showed differential protein expression levels in in-house case-control plasma samples (P = 2.60E-2). This study represented the first effort to identify shared RA markers from different functional cells or tissues. The results suggested that one of the shared genes, i.e., PCBP1, is a promising biomarker for RA.
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Acknowledgments
The study was supported by the Natural Science Foundation of China (81473046, 31401079, 81401343, 31271336, and 81373010), the Natural Science Foundation of Jiangsu Province (BK20130300), the Startup Fund from Soochow University (Q413900112, Q413900712), the Project funded by China Postdoctoral Science Foundation (2014M551649), and a Project of the Priority Academic Program Development of Jiangsu Higher Education Institutions.
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Wei Xia and Jian Wu contribute equally to the work.
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Note: The heatmaps show the correlation matrices between the GVPs of seven datasets, positive correlations are shown in red, and negative correlations in green. A, B, C show the results of Pearson, Kendall, and Spearman correlation, respectively
Table S1
Marginal analysis, approach1: overlaps of top100 ranked genes across the seven datasets. (PDF 19 kb)
Table S2
Marginal analysis, approach 2-t test: overlaps of genes selected using FDR = 0.1 and 0.01 across the seven datasets. (PDF 20 kb)
Table S3
Analysis of joint effects: Lasso and stability selection with cutoff 0.1 (PDF 19 kb)
Table S4
The functional annotation clustering analysis (PDF 96 kb)
Table S5
Characteristics of the eight novel RA-associated genes in PPI analysis (PDF 97 kb)
Figure S1
Analysis of marginal effects: approach 3 with three correlations (PDF 174 kb)
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Xia, W., Wu, J., Deng, FY. et al. Integrative analysis for identification of shared markers from various functional cells/tissues for rheumatoid arthritis. Immunogenetics 69, 77–86 (2017). https://doi.org/10.1007/s00251-016-0956-4
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DOI: https://doi.org/10.1007/s00251-016-0956-4