Ultrastructural morphogenesis of an amphibian iridovirus isolated from Chinese giant salamander (Andrias davidianus).
Haemorrhagic disease of Chinese giant salamanders (Andrias davidianus) (CGSs) is an emerging condition caused by an iridovirus of the genus Ranavirus within the family Iridoviridae. Several studies have described different biological properties of the virus, but some aspects of its replication cycle, including ultrastructural alterations, remain unknown. The aim of the present study was to describe the morphogenesis of Chinese giant salamander iridovirus (GSIV) in an epithelioma papulosum cyprinid (EPC) cell line at the ultrastructural level. Cells were infected with GSIV at a multiplicity of infection (MOI) of 10 and examined at 1, 2, 4, 6, 12, 24, 48, 72, 84 and 96 h post infection. GSIV entered EPC cells by endocytosis or fusion after adsorption to the cell membrane. Following uncoating, the viral cores translocated to the nucleus and the virus began to replicate. Different stages of virus self-assembly were observed in the slightly electron-lucent viromatrix near the cell nucleus. In the late phase of virus infection, most nucleocapsids were mature and formed a typical icosahedral shape and aggregated in pseudocrystalline array at the viromatrix or were budding at the plasma membrane. Virus infection was readily detected by electron microscopy before cytopathic effect appeared in cell culture. The EPC cell line represents a suitable in-vitro model for study of GSIV morphogenesis and characterization of the GSIV replication cycle.
Division of Fish Disease, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences; Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture, Wuhan, Hubei 430223, PR China.
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Ma
Division of Fish Disease, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences; Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture, Wuhan, Hubei 430223, PR China. Electronic address: zenglingbing@gmail.com.
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L
Zeng
Division of Fish Disease, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences; Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture, Wuhan, Hubei 430223, PR China.
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Zhou
Division of Fish Disease, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences; Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture, Wuhan, Hubei 430223, PR China.
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Jiang
Division of Fish Disease, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences; Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture, Wuhan, Hubei 430223, PR China.
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Zhang
Division of Fish Disease, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences; Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture, Wuhan, Hubei 430223, PR China.
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Fan
Division of Fish Disease, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences; Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture, Wuhan, Hubei 430223, PR China.
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Meng
Division of Fish Disease, Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences; Key Laboratory of Freshwater Biodiversity Conservation, Ministry of Agriculture, Wuhan, Hubei 430223, PR China.
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Xu
D000818:Animals; D002460:Cell Line; D004279:DNA, Viral; D008854:Microscopy, Electron; D017995:Ranavirus / Q000302:isolation & purification / Q000648:ultrastructure*; D014562:Caudata / Q000821:virology*
D004279:DNA, Viral
Chinese giant salamander iridovirus (GSIV); electron microscopy; ultrastructural morphogenesis