Journal of fish pathology (한국어병학회지)

The Korean Society of Fish Pathology (한국어병학회)
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Characterization of rock bream (Oplegnathus fasciatus) fin cells and its susceptibility to different genotypes of megalocytiviruses

  • Jeong, Ye Jin (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Kim, Young Chul (Pathology Division, National Institute of Fisheries Science) ;
  • Min, Joon Gyu (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Jeong, Min A (Department of Aquatic Life Medicine, Pukyong National University) ;
  • Kim, Kwang Il (Department of Aquatic Life Medicine, Pukyong National University)
  • Received : 2021.11.12
  • Accepted : 2021.11.25
  • Published : 2021.12.31
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Abstract

Genus Megalocytivirus cause red sea bream iridoviral disease (RSIVD) and scale drop disease (SDD). Based on the phylogeny of the major capsid protein (MCP) and adenosine triphosphatase (ATPase) genes, megalocytiviruses except for SDD virus (SDDV) could be three different genotypes, red sea bream iridovirus (RSIV), infectious spleen and kidney necrosis (ISKNV), and turbot reddish body iridovirus (TRBIV). In this study, primary cells derived from the caudal fin of rock bream (Oplegnathus fasciatus) grew at 25℃ in Leibovitz's medium supplemented with 10% (v/v) fetal bovine serum and primocin (100 ㎍/mL). Rock bream fin (RBF) cells exhibited susceptibility to infections by different genotypes of megalocytiviruses (RSIV, ISKNV and TRBIV) with the appearance of cytopathic effects with an increase in the viral genome copy number. Furthermore, compared to grunt fin (GF) cells, even though 10 times lower number of RSIV genome copies were inoculated in RBF cells, viral genome copy number produced on RBF cells were 44 times higher than that of GF cells at 7 d post-inoculation. As the isolated RBF cells are sensitive to different genotypes of megalocytiviruses (RSIV, ISKNV and TRBIV), they can be used for future studies regarding in vitro viral infection and subsequent diagnosis.

Keywords

Acknowledgement

This work was supported by the Pukyong National University Research Fund in 2020 (CD20200857).

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