Journal of fish pathology (한국어병학회지)

The Korean Society of Fish Pathology (한국어병학회)
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Transcriptional profiles of rock bream iridovirus (RBIV) using microarray approaches

  • Myung-Hwa, Jung (Department of Marine Bio and Medical Sciences, Hanseo University) ;
  • Jun-Young, Song (Pathology Division, National Institute of Fisheries Science) ;
  • Sung-Ju, Jung (Department of Aqualife Medicine, Chonnam National University)
  • Received : 2022.11.09
  • Accepted : 2022.12.06
  • Published : 2022.12.31
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Abstract

Rock bream iridovirus (RBIV) causes high mortality and economic losses in the rock bream (Oplegnathus fasciatus) aquaculture industry in Korea. Viral open reading frames (ORFs) expression profiling at different RBIV infection stages was investigated using microarray approaches. Rock bream were exposed to the virus and held for 7 days at 23 ℃ before the water temperature was reduced to 17 ℃. Herein, 28% mortality was observed from 24 to 35 days post infection (dpi), after which no mortality was observed until 70 dpi (end of the experiment). A total of 27 ORFs were significantly up- or down-regulated after RBIV infection. In RBIV-infected rock bream, four viral genes were expressed after 2 dpi. Most RBIV ORFs (26 genes, 96.2%) were significantly elevated between 7 and 20 dpi. Among them, 12 ORF (44.4%) transcripts reached their peak expression intensity at 15 dpi, and 14 ORFs (51.8%) were at peak expression intensity at 20 dpi. Expression levels began to decrease after 25 dpi, and 92.6% of ORFs (25 genes) were expressed below 1-fold at 70 dpi. From the microarray data, in addition to the viral infection, viral gene expression profiles were categorized into three infection stages, namely, early (2 dpi), middle (7 to 20 dpi), and recovery (25 and 70 dpi). RBIV ORFs 009R, 023R, 032L, 049L, and 056L were remarkably expressed during RBIV infection. Furthermore, six ORFs (001L, 013R, 052L, 053L, 058L, and 061L) were significantly expressed only at 20 dpi. To verify the cDNA microarray data, we performed quantitative real-time PCR, and the results were similar to that of the microarray. Our results provide novel observations on broader RBIV gene expression at different stages of infection and the development of control strategies against RBIV infection.

Keywords

Acknowledgement

This research was supported by the National Institute of Fisheries Science, Ministry of Oceans and Fisheries, Republic of Korea (R2022070).

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