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Diseases of Aquatic Organisms

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DAO 120:17-26 (2016)  -  DOI:

Isolation and preliminary characterization of a new pathogenic iridovirus from redclaw crayfish Cherax quadricarinatus 

Limei Xu*, Tiantian Wang*, Fang Li**, Feng Yang**

Key Laboratory of Marine Genetic Resources, Fujian Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, PR China
*These authors contributed equally to this work
**Corresponding authors: ;

ABSTRACT: 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 (~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 ~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.

KEY WORDS: Iridovirus · Crustacean · Ultrastructure · Major capsid protein · Phylogeny

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Cite this article as: Xu L, Wang T, Li F, Yang F (2016) Isolation and preliminary characterization of a new pathogenic iridovirus from redclaw crayfish Cherax quadricarinatus . Dis Aquat Org 120:17-26.

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