Full-Genome Sequencing and Confirmation of the Causative Agent of Erythrocytic Inclusion Body Syndrome in Coho Salmon Identifies a New Type of Piscine Orthoreovirus.
Erythrocytic inclusion body syndrome (EIBS) causes mass mortality in farmed salmonid fish, including the coho salmon, Onchorhynchus kisutchi, and chinook salmon, O. tshawytscha. The causative agent of the disease is a virus with an icosahedral virion structure, but this virus has not been characteri...
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ftdoajarticles:oai:doaj.org/article:70f125981a054d3db9cbb4d30a77ea37 2023-05-15T15:32:58+02:00 Full-Genome Sequencing and Confirmation of the Causative Agent of Erythrocytic Inclusion Body Syndrome in Coho Salmon Identifies a New Type of Piscine Orthoreovirus. Tomokazu Takano Akatsuki Nawata Takamitsu Sakai Tomomasa Matsuyama Takafumi Ito Jun Kurita Sachiko Terashima Motoshige Yasuike Yoji Nakamura Atushi Fujiwara Akira Kumagai Chihaya Nakayasu 2016-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0165424 https://doaj.org/article/70f125981a054d3db9cbb4d30a77ea37 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC5082797?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0165424 https://doaj.org/article/70f125981a054d3db9cbb4d30a77ea37 PLoS ONE, Vol 11, Iss 10, p e0165424 (2016) Medicine R Science Q article 2016 ftdoajarticles https://doi.org/10.1371/journal.pone.0165424 2022-12-31T08:16:22Z Erythrocytic inclusion body syndrome (EIBS) causes mass mortality in farmed salmonid fish, including the coho salmon, Onchorhynchus kisutchi, and chinook salmon, O. tshawytscha. The causative agent of the disease is a virus with an icosahedral virion structure, but this virus has not been characterized at the molecular level. In this study, we sequenced the genome of a virus purified from EIBS-affected coho salmon. The virus has 10 dsRNA genomic segments (L1, L2, L3, M1, M2, M3, S1, S2, S3, and S4), which closely resembles the genomic organization of piscine orthoreovirus (PRV), the causative agent of heart and skeletal inflammation (HSMI) in Atlantic salmon and HSMI-like disease in coho salmon. The genomic segments of the novel virus contain at least 10 open reading frames (ORFs): lambda 1 (λ1), λ2, λ3, mu 1 (μ1), μ2, μNS, sigma 1 (σ1), σ2, σ3, and σNS. An additional ORF encoding a 12.6-kDa protein (homologue of PRV p13) occurs in the same genomic segment as σ3. Phylogenetic analyses based on S1 and λ3 suggest that this novel virus is closely related to PRV, but distinctly different. Therefore, we designated the new virus 'piscine orthoreovirus 2' (PRV-2). Reverse transcription-quantitative real-time PCR revealed a significant increase in PRV-2 RNA in fish blood after the artificial infection of EIBS-naïve fish but not in that of fish that had recovered from EIBS. The degree of anemia in each fish increased as the PRV-2 RNA increased during an epizootic season of EIBS on an inland coho salmon farm. These results indicate that PRV-2 is the probable causative agent of EIBS in coho salmon, and that the host acquires immunity to reinfection with this virus. Further research is required to determine the host range of PRV species and the relationship between EIBS and HSMI in salmonid fish. Article in Journal/Newspaper Atlantic salmon Directory of Open Access Journals: DOAJ Articles Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) PLOS ONE 11 10 e0165424 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Tomokazu Takano Akatsuki Nawata Takamitsu Sakai Tomomasa Matsuyama Takafumi Ito Jun Kurita Sachiko Terashima Motoshige Yasuike Yoji Nakamura Atushi Fujiwara Akira Kumagai Chihaya Nakayasu Full-Genome Sequencing and Confirmation of the Causative Agent of Erythrocytic Inclusion Body Syndrome in Coho Salmon Identifies a New Type of Piscine Orthoreovirus. |
topic_facet |
Medicine R Science Q |
description |
Erythrocytic inclusion body syndrome (EIBS) causes mass mortality in farmed salmonid fish, including the coho salmon, Onchorhynchus kisutchi, and chinook salmon, O. tshawytscha. The causative agent of the disease is a virus with an icosahedral virion structure, but this virus has not been characterized at the molecular level. In this study, we sequenced the genome of a virus purified from EIBS-affected coho salmon. The virus has 10 dsRNA genomic segments (L1, L2, L3, M1, M2, M3, S1, S2, S3, and S4), which closely resembles the genomic organization of piscine orthoreovirus (PRV), the causative agent of heart and skeletal inflammation (HSMI) in Atlantic salmon and HSMI-like disease in coho salmon. The genomic segments of the novel virus contain at least 10 open reading frames (ORFs): lambda 1 (λ1), λ2, λ3, mu 1 (μ1), μ2, μNS, sigma 1 (σ1), σ2, σ3, and σNS. An additional ORF encoding a 12.6-kDa protein (homologue of PRV p13) occurs in the same genomic segment as σ3. Phylogenetic analyses based on S1 and λ3 suggest that this novel virus is closely related to PRV, but distinctly different. Therefore, we designated the new virus 'piscine orthoreovirus 2' (PRV-2). Reverse transcription-quantitative real-time PCR revealed a significant increase in PRV-2 RNA in fish blood after the artificial infection of EIBS-naïve fish but not in that of fish that had recovered from EIBS. The degree of anemia in each fish increased as the PRV-2 RNA increased during an epizootic season of EIBS on an inland coho salmon farm. These results indicate that PRV-2 is the probable causative agent of EIBS in coho salmon, and that the host acquires immunity to reinfection with this virus. Further research is required to determine the host range of PRV species and the relationship between EIBS and HSMI in salmonid fish. |
format |
Article in Journal/Newspaper |
author |
Tomokazu Takano Akatsuki Nawata Takamitsu Sakai Tomomasa Matsuyama Takafumi Ito Jun Kurita Sachiko Terashima Motoshige Yasuike Yoji Nakamura Atushi Fujiwara Akira Kumagai Chihaya Nakayasu |
author_facet |
Tomokazu Takano Akatsuki Nawata Takamitsu Sakai Tomomasa Matsuyama Takafumi Ito Jun Kurita Sachiko Terashima Motoshige Yasuike Yoji Nakamura Atushi Fujiwara Akira Kumagai Chihaya Nakayasu |
author_sort |
Tomokazu Takano |
title |
Full-Genome Sequencing and Confirmation of the Causative Agent of Erythrocytic Inclusion Body Syndrome in Coho Salmon Identifies a New Type of Piscine Orthoreovirus. |
title_short |
Full-Genome Sequencing and Confirmation of the Causative Agent of Erythrocytic Inclusion Body Syndrome in Coho Salmon Identifies a New Type of Piscine Orthoreovirus. |
title_full |
Full-Genome Sequencing and Confirmation of the Causative Agent of Erythrocytic Inclusion Body Syndrome in Coho Salmon Identifies a New Type of Piscine Orthoreovirus. |
title_fullStr |
Full-Genome Sequencing and Confirmation of the Causative Agent of Erythrocytic Inclusion Body Syndrome in Coho Salmon Identifies a New Type of Piscine Orthoreovirus. |
title_full_unstemmed |
Full-Genome Sequencing and Confirmation of the Causative Agent of Erythrocytic Inclusion Body Syndrome in Coho Salmon Identifies a New Type of Piscine Orthoreovirus. |
title_sort |
full-genome sequencing and confirmation of the causative agent of erythrocytic inclusion body syndrome in coho salmon identifies a new type of piscine orthoreovirus. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2016 |
url |
https://doi.org/10.1371/journal.pone.0165424 https://doaj.org/article/70f125981a054d3db9cbb4d30a77ea37 |
long_lat |
ENVELOPE(-62.983,-62.983,-64.300,-64.300) |
geographic |
Lambda |
geographic_facet |
Lambda |
genre |
Atlantic salmon |
genre_facet |
Atlantic salmon |
op_source |
PLoS ONE, Vol 11, Iss 10, p e0165424 (2016) |
op_relation |
http://europepmc.org/articles/PMC5082797?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0165424 https://doaj.org/article/70f125981a054d3db9cbb4d30a77ea37 |
op_doi |
https://doi.org/10.1371/journal.pone.0165424 |
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PLOS ONE |
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11 |
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