Deciphering the latent biomarkers in HBV and HDV- associated HepatoCellular carcinoma – An integrated bioinformatics analysis

Abundant studies convey chronic viral hepatitis (HBV and HDV) infection to be associated with development and promotion of HepatoCellular Carcinoma (HCC), making HBV and HDV contamination as one of the foremost source of HCC development worldwide. In the present study we intended to identify potential therapeutic biomarkers for HBV and HDV induced HCC development and progression. Hereby, we executed meta-analysis of micro-array datasets: GSE121248 comprising 107 viral infected samples categorized as 37 normal adjacent samples and 70 tumor samples along with GSE107170 containing 307 virus-positive tissue samples of which 155 samples were considered for further analysis encompassing 105 normal tissues and 50 HCC tumor samples. Eventually by analyzing an aggregate of 262 samples through GeneSpring Software, 486 Differentially Expressed Genes (DEGs) were identified among HBV and HDV infected samples leading to HCC including 152 up-regulated and 334 down-regulated genes. Subsequently resulted DEGs were processed for functional annotation by using OmicsBox, Pathway enrichment and disease association analysis by using EnrichR webserver. Additionally, Protein-Protein Interaction Network was constructed to identify top 10 most significant hub nodes by using Cytoscape tool and cytohubba plugin. Furthermore the identified top 10 noteworthy hub nodes were analyzed for overall survival, disease free survival and expression validation in HCC samples by employing GEPIA2 and HPA databases. Consequently hub genes were assessed for diagnostic efficacy by Receiver Operating Characteristic curves (ROC) which demonstrates promising performance of all the hub genes. Conclusively, our findings postulate TOP2A, PBK, NUF2, CCNB1, CDC20, BUB1B, NDC80, MAD2L1, DLGAP5 and KIF4A as the plausible biomarkers occupied in oncogenic pathways having a probable function in progression of HBV and HDV contaminated cells to HCC, proliferation of HCC and tumorogenesis. The present study also aids for elevated understanding of virus-associated HCC progression.