Abstract
Osteoarthritis (OA) is a primary leading cause of pain and disability. However, some cases are diagnosed at the later stage which delayed the timely treatment. This study aims to identify effective diagnostic signature for OA. The mRNA profile GSE48566 including 106 blood samples of OA patients and 33 blood samples of healthy individuals was downloaded from Gene Expression Omnibus (GEO) database. The potential OA-related genes were screened by weighted gene co-expression network analysis (WGCNA). Gene ontology (GO) term and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis were performed to reveal the functions or pathways of OA-related genes using the clusterProfiler function package of R software. Key genes significantly involved in OA progression were further screened by protein–protein interaction (PPI) network. The logistic regression model and the random forest model were conducted by bringing into optimal genes selected by stepwise regression analysis, and fivefold cross validation method was used to determine their reliability. A total of 146 genes, existed in three modules and might be associated with the occurrence of OA, were screened. 15 genes were screened from the PPI network and four genes, including CCR6, CLEC7A, IL18 and SRSF2, were further optimized. Finally, a logistic regression model and a random forest model were conducted by bringing into four optimal genes, and could reliably separate OA patients from healthy subjects. Our study established two effective diagnostic models based on CCR6, CLEC7A, IL18 and SRSF2, which could reliably separate OA patients from healthy subjects.
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The mRNA profile GSE48566 consist of 106 blood samples from OA patients and 33 blood samples from healthy subjects was downloaded from Gene Expression Omnibus (GEO) database.
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Conceptualization, Methodology and investigation: WZ and WX; Data curation and Formal Analysis: QQ and BS; Writing—original draft preparation: WZ, WX, QQ and BS; Writing—review and editing: WX; All co-authors take full responsibility for all aspects of the work.
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296_2021_4795_MOESM2_ESM.tif
Supplementary file2 The diagnosis diagram of logistic regression model. The diagram of Residuals vs. Leverage. The red dotted line indicates the COOK distance. Generally, a point with the COOK greater than 0.5 is a very “influentia” point, which affects the reliability of the model. (TIF 1897 KB)
296_2021_4795_MOESM3_ESM.tif
Supplementary file3 The distribution of mRNA expression values. The horizontal axis represents the samples and the vertical axis represent mRNA expression vaules. (TIF 9134 KB)
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Zhang, W., Qiu, Q., Sun, B. et al. A four-genes based diagnostic signature for osteoarthritis. Rheumatol Int 41, 1815–1823 (2021). https://doi.org/10.1007/s00296-021-04795-6
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DOI: https://doi.org/10.1007/s00296-021-04795-6