In order to elucidate the expression changes of host genes of SPF chickens infected with duck-origin H7N9 subtype avian influenza virus. The lungs of SPF chickens infected with duck-origin H7N9 subtype avian influenza virus were collected and high throughout sequenced. Compared with the control group, there were 740 differentially expressed genes were obtained in infection group, including 602 up-regulated genes and 138 down-regulated genes. The analysis of the GO items showed that the differentially expressed genes were involved in immune responses and inflammatory responses. The results of KEGG analysis showed that 7 pathways were enriched significantly, in those the Toll-like pathway had 11 up-regulated genes, namely IL-6, TLR4, Pik3, IRF7, MD-2, IRF5, MYD88, CD86, STAT1, TLR2, and CCL4. There were 7 up-regulated genes in NOD-like receptor signaling pathway, which were IRF7, CTSB, P2RX7, CYBB, PSTPIP1, HSP90AA1, and NAMPT. In Toll-like signaling pathway，TLR4 was activated by MD-2 after viral infection, and then activated downstream IRF5. At the same time, the NLRP3 inflammasome also played an important role in the process of H7N9 virus infection.
Overall design: Lung mRNA profiles of SPF chickens infected with duck-origin H7N9 AIV and control were generated by deep sequencing, in triplicate, using Illumina X ten.
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