Transcriptomic analysis reveals the molecular mechanism of apoptosis induced by Muscovy duck reovirus

Abstract

This study was to investigate the molecular mechanism underlying the apoptosis induced by Muscovy duck reovirus (MDRV) through a transcriptomic analysis. Muscovy ducklings were infected with MDRV strain YB and the apoptotic cells in their livers were examined with terminal-deoxynucleotidyl-transferase-mediated nick end labeling and flow cytometry. Genes differentially expressed in the livers of the MDRV-infected ducklings were screened by comparing them with those of uninfected ducklings and were analyzed with a transcriptomic method to illuminate the mechanism of MDRV infection. The results showed that MDRV infection strongly induced apoptotic cells in liver. Significant pathway enrichment determined by a Kyoto Encyclopedia of Genes and Genomes analysis showed that MDRV activated the death receptor family signaling pathway (Fas, TNFR1), the interleukin receptor signaling pathway (IL1, IL3), the phosphatidylinositol 3-kinase signaling pathway, NF-ҝB signaling pathway and calcium ions signaling pathway to induce apoptosis. This was verified by SYBR-Green-based fluorescence quantitative PCR. In conclusion, MDRV induce apoptosis by activation multi signaling pathways.

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