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Characterization, Expression Pattern and Antiviral Activities of Mx Gene in Chinese Giant Salamander, Andrias davidianus

1
National Demonstration Center for Experimental Fisheries Science Education, Shanghai Ocean University, Shanghai 201306, China
2
Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan 430223, China
*
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(6), 2246; https://doi.org/10.3390/ijms21062246
Received: 23 February 2020 / Revised: 14 March 2020 / Accepted: 23 March 2020 / Published: 24 March 2020
(This article belongs to the Section Molecular Biology)
Mx, Myxovirus resistance is an important interferon-stimulated protein that mediates antiviral responses. In this study, the expression and activities of Chinese giant salamander, Andrias davidianus Mx gene, AdMx, were investigated. The AdMx cDNA sequence contains an open reading frame (ORF) of 2112 nucleotides, encoding a putative protein of 703 aa. Meanwhile, AdMx possesses the conserved tripartite GTP binding motif and a dynamin family signature. qRT-PCR analysis revealed a broad expression of AdMx in vivo, with the highest expression levels in brain, kidney and spleen. The AdMx expression level in kidney, spleen and muscle significantly increased at 6 h after Chinese giant salamander iridovirus (GSIV) infection and peaked at 48 h, while that in muscle cell line (GSM) was not noticeably up-regulated until 72 h post infection. Additionally, a plasmid expressing AdMx was constructed and transfected into the Chinese giant salamander GSM cells. The virus load and gene copies in AdMx over-expressed cells were significantly reduced compared with those in the control cells. Moreover, compared to the control cells, a lower level of virus major capsid protein (MCP) synthesis in AdMx over-expressed cells was confirmed by Western blot. These results collectively suggest that Mx plays an important antiviral role in the immune responses against GSIV in Chinese giant salamander. View Full-Text
Keywords: Chinese giant salamander; Andrias davidianus; iridovirus; Mx; expression pattern; antiviral activities Chinese giant salamander; Andrias davidianus; iridovirus; Mx; expression pattern; antiviral activities
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Liu, Y.; Li, Y.; Zhou, Y.; Jiang, N.; Fan, Y.; Zeng, L. Characterization, Expression Pattern and Antiviral Activities of Mx Gene in Chinese Giant Salamander, Andrias davidianus. Int. J. Mol. Sci. 2020, 21, 2246.

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