期刊
DISEASES OF AQUATIC ORGANISMS
卷 120, 期 1, 页码 17-26出版社
INTER-RESEARCH
DOI: 10.3354/dao03007
关键词
Iridovirus; Crustacean; Ultrastructure; Major capsid protein; Phylogeny
资金
- National Basic Research Program of China (973 Program) [2012CB 114401]
- China Agriculture Research System [CARS-47]
- National Natural Science Foundation of China [41376173, 41276176]
We report the preliminary characterization of a new iridovirus detected in diseased Cherax quadricarinatus collected from a farm in Fujian, China. Transmission electron microscopy identified numerous icosahedral particles (similar to 150 nm in diameter) in the cytoplasm and budding from the plasma membrane of hematopoietic tissue cells. SDS-PAGE of virions semi-purified from the hemolymph of moribund C. quadricarinatus identified 24 proteins including a 50 kDa major capsid protein (MCP). By summing the sizes of DNA restriction endonuclease fragments, the viral genome was estimated to be similar to 150 kb in length. A 34 amino acid sequence deduced from a 103 bp MCP gene region amplified by PCR using degenerate primers targeted to MCP gene regions conserved among iridoviruses and chloriridoviruses was most similar (55% identity) to Sergestid iridovirus. Based on virion morphology, protein composition, DNA genome length, and MCP sequence relatedness, the virus identified has tentatively been named Cherax quadricarinatus iridovirus (CQIV). In addition, experimental infection of healthy C. quadricarinatus, Procambarus clarkii, and Litopenaeus vannamei with CQIV caused the same disease and high mortality, suggesting that CQIV poses a potential threat to cultured and wild crayfish and shrimp.
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