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Erschienen in: Clinical Rheumatology 8/2021

09.01.2021 | Original Article

Identification of abnormally methylated–differentially expressed genes and pathways in osteoarthritis: a comprehensive bioinformatic study

verfasst von: Linli Zheng, Weishen Chen, Guoyan Xian, Baiqi Pan, Yongyu Ye, Minghui Gu, Yinyue Ma, Ziji Zhang, Puyi Sheng

Erschienen in: Clinical Rheumatology | Ausgabe 8/2021

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Abstract

Objectives

To investigate abnormally methylated–differentially expressed genes (DEGs) and their related pathways in osteoarthritis (OA) by comprehensive bioinformatic analysis.

Methods

Gene expression profiles of GSE51588 and GSE114007, and a gene methylation microarray data GSE63695 were downloaded from the Gene Expression Omnibus (GEO) repository. Abnormally methylated DEGs were identified. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses of these genes were subsequently performed using the Database for Annotation, Visualization and Integrated Discovery (DAVID). The protein-protein interaction (PPI) network was built from STRING. Module analysis and hub gene identification were performed by using Cytoscape. Co-expression analysis was also constructed using the CEMiTool package.

Results

In total, 133 abnormally methylated DEGs were identified, including 85 hypomethylation high-expression genes and 48 hypermethylation low-expression genes. Among biological processes and KEGG pathways of abnormally methylated DEGs, collagen fibril organization was enriched most frequently, and pathways of oxidative stress and aging were enriched, including HIF-1 signaling pathway, AMPK signaling pathway, and FoxO signaling pathway. In PPI networks, the hub genes of hypomethylation high-expression genes were COL1A1, COL3A1, COL1A2, COL5A2, LUM, MMP2, SPARC, COL2A1, COL6A2, and COL7A1, and the hub genes of hypermethylation low-expression genes were VEGFA, SLC2A1, LDHA, PDK1, and BNIP3. Combined with co-expression analysis, COL3A1, LUM, and MMP2 were the critical hypomethylation high-expression hub genes in medial tibia subchondral bone.

Conclusions

Our study implied abnormally methylated DEGs and dysregulated pathways in OA. Common methylation biomarkers included COL3A1, LUM, and MMP2, and we also found that THBS2 may serve as a novel biomarker in end-stage OA.
Key Points
• Abnormally methylated differentially expressed genes regulate osteoarthritis.
• Hypomethylation high-expression genes were related to the extracellular matrix.
• Hypermethylation low-expression genes were related to oxidative stress and aging.
• COL3A1, LUM, and MMP2 were potential methylation biomarkers for osteoarthritis.
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Metadaten
Titel
Identification of abnormally methylated–differentially expressed genes and pathways in osteoarthritis: a comprehensive bioinformatic study
verfasst von
Linli Zheng
Weishen Chen
Guoyan Xian
Baiqi Pan
Yongyu Ye
Minghui Gu
Yinyue Ma
Ziji Zhang
Puyi Sheng
Publikationsdatum
09.01.2021
Verlag
Springer International Publishing
Erschienen in
Clinical Rheumatology / Ausgabe 8/2021
Print ISSN: 0770-3198
Elektronische ISSN: 1434-9949
DOI
https://doi.org/10.1007/s10067-020-05539-w

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