Identification and analysis of co-disease genes between COVID-19 and osteoarthritis

Background: The molecular mechanisms of corona virus disease 2019 (COVID-19) and osteoarthritis (OA) are unclear, and there is an urgent need to identify new biomarkers and explore their potential molecular mechanisms in COVID-19 and OA . Methods : The GSE57218, GSE157103 training sets and the GSE82107, GSE171110 validation sets were acquired via gene expression omnibus (GEO) database. First, differentially expressed genes (DEGs) between disease and normal samples in the GSE57218 and GSE157103 training sets were respectively sifted out by differential expression analysis. The modules with the highest correlation with OA and normal, COVID-19 and non COVID-19 were gained by weighted gene co-expression network analysis (WGCNA), individually. Then, OA-DEGs were intersected with the module genes that had significant correlation with OA, and COVID-19-DEGs were intersected with the module genes which were dramatically correlated with COVID-19 to yield OA-intersected genes and COVID-19 intersected genes, respectively. The OA-intersected genes and COVID-19 intersected genes were intersected to yield candidate genes, and they were analyzed for function enrichment analysis. Next, the seven algorithms (Closeness, MCC, Degree, MNC, Radality, Stress and EPC) were performed on candidate genes to sift out biomarkers. Finally, we constructed the competing endogenous RNA (ceRNA), transcription factor (TF)/miRNA-mRNA and drug-target regulatory networks. Results: There were 1135 OA-DEGs and 4336 COVID-19-DEGs between disease and normal samples in the GSE57218 and GSE157103 training sets, respectively. The pink, blue and brown modules had significant correlations with OA in the GSE57218 training set, while in the GSE157103 training set, the pink and brown modules were notably correlated with COVID-19. We finally yield 715 OA-intersected genes and 2282 COVID-19-intersected genes. After intersecting the above two intersected genes, we gained 106 candidate genes, and they were involved in ADP metabolic process, nucleoside diphosphate phosphorylation, etc.. The 7 biomarkers, namely AK1, APP, ENO1, TPI1, HSP90B1, HSPB1 and ESR1, were acquired based on seven algorithms. Finally, we successfully constructed the ceRNA, TF/miRNA-mRNA and drug-target networks. Conclusion : Through bioinformatic methods, we explored the biomarkers (AK1, APP, ENO1, TPI1, HSP90B1, HSPB1 and ESR1) of COVID-19 combined OA, providing new ideas for studies related to molecular mechanisms and treatment of comorbidity.