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Vakharia VN, Ammayappan A, Yusuff S, Tesfaye TM, Kurath G. Heterologous Exchanges of Glycoprotein and Non-Virion Protein in Novirhabdoviruses: Assessment of Virulence in Yellow Perch ( Perca flavescens) and Rainbow Trout ( Oncorhynchus mykiss). Viruses 2024; 16:652. [PMID: 38675990 PMCID: PMC11054476 DOI: 10.3390/v16040652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 04/15/2024] [Accepted: 04/19/2024] [Indexed: 04/28/2024] Open
Abstract
Infectious hematopoietic necrosis virus (IHNV) and viral hemorrhagic septicemia virus (VHSV) are rhabdoviruses in two different species belonging to the Novirhabdovirus genus. IHNV has a narrow host range restricted to trout and salmon species, and viruses in the M genogroup of IHNV have high virulence in rainbow trout (Oncorhynchus mykiss). In contrast, the VHSV genotype IVb that invaded the Great Lakes in the United States has a broad host range, with high virulence in yellow perch (Perca flavescens), but not in rainbow trout. By using reverse-genetic systems of IHNV-M and VHSV-IVb strains, we generated six IHNV:VHSV chimeric viruses in which the glycoprotein (G), non-virion-protein (NV), or both G and NV genes of IHNV-M were replaced with the analogous genes from VHSV-IVb, and vice versa. These chimeric viruses were used to challenge groups of rainbow trout and yellow perch. The parental recombinants rIHNV-M and rVHSV-IVb were highly virulent in rainbow trout and yellow perch, respectively. Parental rIHNV-M was avirulent in yellow perch, and chimeric rIHNV carrying G, NV, or G and NV genes from VHSV-IVb remained low in virulence in yellow perch. Similarly, the parental rVHSV-IVb exhibited low virulence in rainbow trout, and chimeric rVHSV with substituted G, NV, or G and NV genes from IHNV-M remained avirulent in rainbow trout. Thus, the G and NV genes of either virus were not sufficient to confer high host-specific virulence when exchanged into a heterologous species genome. Some exchanges of G and/or NV genes caused a loss of host-specific virulence, providing insights into possible roles in viral virulence or fitness, and interactions between viral proteins.
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Affiliation(s)
- Vikram N. Vakharia
- Institute of Marine & Environmental Technology, University of Maryland Baltimore County, Baltimore, MD 21202, USA; (A.A.); (S.Y.)
| | - Arun Ammayappan
- Institute of Marine & Environmental Technology, University of Maryland Baltimore County, Baltimore, MD 21202, USA; (A.A.); (S.Y.)
| | - Shamila Yusuff
- Institute of Marine & Environmental Technology, University of Maryland Baltimore County, Baltimore, MD 21202, USA; (A.A.); (S.Y.)
| | | | - Gael Kurath
- U.S. Geological Survey, Western Fisheries Research Center, Seattle, WA 98115, USA
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Wu D, Wang J, Zhang Y, Wang Q, Liu Q, Shao S. Characterization and pathogenicity analysis of a newly isolated strain of infectious hematopoietic necrosis virus. Microb Pathog 2023; 185:106443. [PMID: 37949305 DOI: 10.1016/j.micpath.2023.106443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/25/2023] [Accepted: 11/04/2023] [Indexed: 11/12/2023]
Abstract
Rainbow trout is one of the fastest-growing aquaculture species and infectious hematopoietic necrosis virus (IHNV) is endemic throughout almost all rainbow trout farms in China nowadays. In this study, IHNV GS21 was identified as the causative pathogen, which resulted in massive mortality of rainbow trout occurring in northwest China. GS21 isolate was propagated in Chinook salmon embryonic cell line (CHSE-214) and induced apparent cytopathic effects (CPE) at 3 days post-infection (dpi). Phylogenetic analysis revealed that GS21 isolate was clustered with other reported Chinese isolates within the J genogroup. Moreover, the complete cDNA sequence of GS21 isolate was obtained and it possesses more than 98 % of ANI values and 89 % of DDH values with other Chinese IHNV isolates. The detailed sequence analysis of G gene revealed the distinct amino acid substitutions of G230, G252, G270, and I277 in GS21 isolate. Furthermore, the artificially infected rainbow trout exhibited similar clinical disease symptoms as natural infection did. The cumulative mortality infected by GS21 isolate of 104 PFU/mL reached 93 % at approximately 13.5 °C. Additionally, viral loads in tissues increased first and declined then as well as the expression of immune-associated genes. Collectively, our results characterized a novel IHNV GS21 isolate that can lead to massive mortality in juvenile rainbow trout and provided a basis to define the pathogenic characteristics and evolutionary relationship of IHNV and host immune response against IHNV infection.
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Affiliation(s)
- Di Wu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Jing Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Yuanxing Zhang
- Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, 200237, China; Laboratory of Aquatic Animal Diseases of MOA, Shanghai, 200237, China
| | - Qiyao Wang
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, 200237, China; Laboratory of Aquatic Animal Diseases of MOA, Shanghai, 200237, China
| | - Qin Liu
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, 200237, China; Laboratory of Aquatic Animal Diseases of MOA, Shanghai, 200237, China
| | - Shuai Shao
- State Key Laboratory of Bioreactor Engineering, East China University of Science and Technology, Shanghai, 200237, China; Shanghai Engineering Research Center of Maricultured Animal Vaccines, Shanghai, 200237, China; Laboratory of Aquatic Animal Diseases of MOA, Shanghai, 200237, China.
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3
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Zhao JZ, Xu LM, Ren GM, Shao YZ, Liu Q, Teng CB, Lu TY. Comparative transcriptome analysis of rainbow trout gonadal cells (RTG-2) infected with U and J genogroup infectious hematopoietic necrosis virus. Front Microbiol 2023; 13:1109606. [PMID: 36733771 PMCID: PMC9887044 DOI: 10.3389/fmicb.2022.1109606] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Accepted: 12/26/2022] [Indexed: 01/18/2023] Open
Abstract
Infectious hematopoietic necrosis virus (IHNV) is the causative pathogen of infectious hematopoietic necrosis, outbreaks of which are responsible for significant losses in rainbow trout aquaculture. Strains of IHNV isolated worldwide have been classified into five major genogroups, J, E, L, M, and U. To date, comparative transcriptomic analysis has only been conducted individually for the J and M genogroups. In this study, we compared the transcriptome profiles in U genogroup and J genogroup IHNV-infected RTG-2 cells with mock-infected RTG-2 cells. The RNA-seq results revealed 17,064 new genes, of which 7,390 genes were functionally annotated. Differentially expressed gene (DEG) analysis between U and J IHNV-infected cells revealed 2,238 DEGs, including 1,011 downregulated genes and 1,227 upregulated genes. Among the 2,238 DEGs, 345 new genes were discovered. The DEGs related to immune responses, cellular signal transduction, and viral diseases were further analyzed. RT-qPCR validation confirmed that the changes in expression of the immune response-related genes trpm2, sting, itgb7, ripk2, and irf1, cellular signal transduction-related genes irl, cacnb2, bmp2l, gadd45α, and plk2, and viral disease-related genes mlf1, mtor, armc5, pik3r1, and c-myc were consistent with the results of transcriptome analysis. Taken together, our findings provide a comprehensive transcriptional analysis of the differential virulence of the U and J genogroups of IHNV, and shed new light on the pathogenic mechanisms of IHNV strains.
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Affiliation(s)
- Jing-Zhuang Zhao
- Cell Biology Laboratory, College of Life Science, Northeast Forestry University, Harbin, China,Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China,Key Laboratory of Aquatic Animal Diseases and Immune Technology of Heilongjiang Province, Harbin, China
| | - Li-Ming Xu
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
| | - Guang-Ming Ren
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
| | - Yi-Zhi Shao
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
| | - Qi Liu
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China
| | - Chun-Bo Teng
- Cell Biology Laboratory, College of Life Science, Northeast Forestry University, Harbin, China
| | - Tong-Yan Lu
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin, China,*Correspondence: Tong-Yan Lu, ✉
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Louboutin L, Cabon J, Vigouroux E, Morin T, Danion M. Comparative analysis of the course of infection and the immune response in rainbow trout (Oncorhynchus mykiss) infected with the 5 genotypes of infectious hematopoietic necrosis virus. Virology 2021; 552:20-31. [DOI: 10.1016/j.virol.2020.09.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 09/03/2020] [Accepted: 09/03/2020] [Indexed: 12/29/2022]
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Joiner CL, Oidtmann BC, Rimmer GSE, McPherson NJ, Dixon PF, Paley RK. Survival of viral haemorrhagic septicaemia virus and infectious haematopoietic necrosis virus in the environment and dried on stainless steel. Transbound Emerg Dis 2020; 68:2295-2307. [PMID: 33085823 PMCID: PMC8358955 DOI: 10.1111/tbed.13888] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 09/16/2020] [Accepted: 10/18/2020] [Indexed: 11/27/2022]
Abstract
Viral haemorrhagic septicaemia virus (VHSV) and infectious haematopoietic necrosis virus (IHNV) are important viral pathogens posing a serious threat to salmonid fish. Survival of two isolates of IHNV and one of VHSV was assessed at temperatures ranging from 4 to 25°C: (a) after drying on stainless steel, (b) in cell culture medium, (c) in filtered river water, (d) in unfiltered river water, and (e) survival, adsorption and desorption in river sediment and five typical soil types. The viruses survived 1 hr to > 84 days depending on the conditions. Survival was inversely related to temperature and organic and inorganic content. Both viruses remained infectious after being dried on stainless steel for several weeks highlighting the risk of mechanical transmission and persistence in a dry environment. Both adsorbed to the soils from the river water inoculum, with titres between 5.56x104 and 2.58x108 TCID50/ml after 1 hr. Clay soils adsorbed the least virus but had the greatest decrease in the river water inoculum (undetectable in ≤ 1 hr), and there was no desorption. Virus desorbed from the other soils into the surrounding water at different rates dependant on soil type (longest desorption was from chalk loam and sandy soil—detected at 28 days). When desorption was no longer detectable, virus persisted, adsorbed to the soil and remained infectious (the longest adsorption was detected in clay loam for ≥ 49 days, but all the viruses adsorbed to soils were likely to have survived longer than that detected, based on their rate of decay). The long survival of the viruses, particularly at cooler temperatures, highlights the risk of survival in the environment and waterborne spread. The data presented here are highly relevant for assessing risk of pathogen introduction via fomites (stainless steel) and for deciding on best control measures in the context of disease outbreaks.
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Affiliation(s)
- Claire L Joiner
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth, UK
| | - Birgit C Oidtmann
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth, UK.,Department for Environment, Food and Rural Affairs, London, UK
| | | | | | - Peter F Dixon
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth, UK
| | - Richard K Paley
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth, UK
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Cvetkovikj A, Radosavljevic V, Cuenca A, Strojmanovska B, Maksimovic-Zoric J, Cvetkovikj I, Olesen NJ. First detection of infectious haematopoietic necrosis virus in farmed rainbow trout in North Macedonia. DISEASES OF AQUATIC ORGANISMS 2020; 140:219-225. [PMID: 32880379 DOI: 10.3354/dao03507] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Infectious haematopoietic necrosis virus (IHNV) is the causative agent of infectious haematopoietic necrosis (IHN), a disease of salmonids responsible for great economic losses. The disease occurs in most parts of the world where rainbow trout is reared but has not been previously reported in North Macedonia. In this study, 150 pooled samples in total, each consisting of organ mix of 10 freshly killed rainbow trout Oncorhynchus mykiss, were collected from 50 trout farms by the Food and Veterinary Agency of North Macedonia as part of the annual surveillance plan for IHN and viral haemorrhagic septicaemia (VHS) control. Screening of samples was done by cell culture and real-time RT-PCR (qRT-PCR). All 150 tested samples were VHS virus (VHSV) qRT-PCR negative. Two samples from different trout farms were IHNV qRT-PCR positive. On cell culture, 1 IHNV qRT-PCR positive sample caused cytopathic effect after 2 passages on EPC cells. The virus, isolated from an asymptomatic rainbow trout fry, was identified by qRT-PCR and designated as MAKIHNV1. The phylogenetic reconstruction indicates that the isolated virus belongs to the European E genogroup, more specifically within the E-1 clade, and is similar to the German, Italian and Iranian isolates. This study has revealed for the first time the presence of IHNV in rainbow trout in North Macedonia. However, it is not possible to make interpretations about the source of infection from the phylogenetic analysis, and the origin of MAKIHNV1 remains unclear.
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Affiliation(s)
- Aleksandar Cvetkovikj
- Veterinary Institute, Faculty of Veterinary Medicine-Skopje, Ss. Cyril and Methodius University in Skopje, Lazar Pop-Trajkov 5-7, 1000 Skopje, North Macedonia
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Gorgoglione B, Ringiesn JL, Pham LH, Shepherd BS, Leaman DW. Comparative effects of Novirhabdovirus genes on modulating constitutive transcription and innate antiviral responses, in different teleost host cell types. Virol J 2020; 17:110. [PMID: 32690033 PMCID: PMC7369537 DOI: 10.1186/s12985-020-01372-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Accepted: 06/30/2020] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND Infectious hematopoietic necrosis virus (IHNV) and viral hemorrhagic septicemia virus (VHSV) are highly contagious, pathogenic Novirhabdoviruses affecting fish and are thusly notifiable diseases with the World Organization for Animal Health. This study assessed the relative capacities of IHNV and VHSV genes to modulate host general transcription and explores the abilities of specific IHNV genes to interfere with the interferon pathway in heterogenous teleost cell-lines. METHODS Optimized protocols allowed for efficient transient transfections in EPC, BF-2, RTG-2 and RTgill-W1 cell lines of plasmids encoding IHNV (M genogroup) and VHSV (-IVb genotype) genes, including N, P, M, G and NV. Their impact on general cellular transcription was measured 48 hours post transfection (hpt) with luciferase constructs driven by a modified β-Actin promoter (pCAG). Their modulation of the innate antiviral immune response was characterized 72 hpt, using luciferase constructs measuring rainbow trout Type I IFN or MX-1 promoter augmentation, upon MAVS co-transfection. RESULTS M was generally confirmed as the strongest constitutive transcriptional suppressor while IHNV P, but not VHSV P, augmented constitutive transcription in fibroblastic cell types. Cell-specific effects were observed for viral G gene, with VHSV G exhibiting suppression of basal transcription in EPC and BF-2 but not in trout cells; while IHNV G was stimulatory in RTG-2, but inhibitory in RTgill-W1. NV consistently stimulated constitutive transcription, with higher augmentation patterns seen in fibroblastic compared to epithelial cells, and for IHNV NV compared to VHSV NV. The innate antiviral immune response, focusing on the IFN pathway, was silenced by IHNV M in all cell lines tested. IHNV N showed a dose-dependent suppression of type I IFN, but with minor effects on MX-1. IHNV P and G played minor IFN-inhibitory roles, consistent and dose-dependent only for G in rainbow trout cells. IHNV NV mediated a consistent stimulatory effect on either Type I IFN or MX-1, but much less pronounced in RTgill-W1. CONCLUSIONS This study extends our understanding of Novirhabdoviruses-host interaction, showing differential innate immune responses in heterogenous cell types. Viral regulators of innate immune signaling are identified, either as dose-dependent suppressors (such as M and N) or stimulators (mainly NV), indicating novel targets for the design of more efficient vaccination strategies.
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Affiliation(s)
- Bartolomeo Gorgoglione
- Aquatic Animal Health Laboratory, Department of Pathobiology and Diagnostic Investigation, CVM & Department of Fisheries and Wildlife, CANR - Michigan State University, East Lansing, MI, 48824, USA.
- Department of Biological Sciences, Wright State University, 235 Diggs Laboratory / 134 Oelman Hall, 3640 Colonel Glenn Hwy, Dayton, OH, 45435, USA.
- Department of Biological Sciences, University of Toledo, 2801 W. Bancroft St, Toledo, OH, 43606, USA.
| | - Jeffery L Ringiesn
- Department of Biological Sciences, Wright State University, 235 Diggs Laboratory / 134 Oelman Hall, 3640 Colonel Glenn Hwy, Dayton, OH, 45435, USA
| | - Loc H Pham
- Department of Biological Sciences, University of Toledo, 2801 W. Bancroft St, Toledo, OH, 43606, USA
| | - Brian S Shepherd
- USDA/ARS/School of Freshwater Sciences, University of Wisconsin-Milwaukee, 600 E. Greenfield Ave, Milwaukee, WI, 53204, USA
| | - Douglas W Leaman
- Department of Biological Sciences, Wright State University, 235 Diggs Laboratory / 134 Oelman Hall, 3640 Colonel Glenn Hwy, Dayton, OH, 45435, USA.
- Department of Biological Sciences, University of Toledo, 2801 W. Bancroft St, Toledo, OH, 43606, USA.
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Fazeli L, Golkar P, Mirakhorli N, Jalali SAH, Mohammadinezhad R. Transient expression of the full-length glycoprotein from infectious hematopoietic necrosis virus in bean (Phaseolus vulgaris) leaves via agroinfiltration. Biotechnol Appl Biochem 2020; 68:648-658. [PMID: 32578912 DOI: 10.1002/bab.1975] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 06/20/2020] [Indexed: 11/07/2022]
Abstract
The glycoprotein of infectious hematopoietic necrosis virus (IHNV), the causative agent of acute disease in salmonids, is the only structural protein of the virus that can induce protective immunity in the fish host. Here, the reliability of bean (Phaseolus vulgaris) plant for the production of this viral protein was examined by the transient expression method. Using the syringe agroinfiltration method, leaves of bean plants were transformed with the expression construct encoding the full-length of IHNV glycoprotein (IHNV-G) gene. Furthermore, the transformation efficacy of two infiltration buffers including PBS-A (PBS+acetosyringone) and MMS-A (MES buffer + MgSO4 + sucrose + acetosyringone) was compared. The analysis of mRNA and dot-blot assay confirmed the transcription and translation of IHNV-G protein in bean leaves. Moreover, Western blotting verified the production of intact, full-length (∼57 kDa) IHNV-G protein in the agroinfiltrated plants. Of note, the production level of IHNV-G using MMS-A agroinfiltration buffer was approximately five times higher compared to PBS-A buffer (0.48 vs. 0.1% of total soluble protein), indicating the effect of infiltration buffer on the transient transformation efficiency. The recombinant protein was purified at the final yield of 0.35 μg/g of fresh leaf tissue, using nickel affinity chromatography. The present work is the first report describing the feasibility of the plant expression platform for the production of IHNV-G protein, which can be served as an oral vaccine against IHNV infection.
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Affiliation(s)
- Leila Fazeli
- Department of Plant Biotechnology, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran
| | - Pooran Golkar
- Department of Natural Resources, Isfahan University of Technology, Isfahan, 84156-83111, Iran.,Research Institute for Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
| | - Neda Mirakhorli
- Department of Plant Biotechnology, Faculty of Agriculture, Shahrekord University, Shahrekord, Iran
| | - Seyed Amir Hossein Jalali
- Department of Natural Resources, Isfahan University of Technology, Isfahan, 84156-83111, Iran.,Research Institute for Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
| | - Rezvan Mohammadinezhad
- Research Institute for Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
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Cabon J, Almeras F, Baud M, Pallandre L, Morin T, Louboutin L. Susceptibility of pike Esox lucius to VHSV and IHNV and potential transmission to rainbow trout Oncorhynchus mykiss. DISEASES OF AQUATIC ORGANISMS 2020; 139:175-187. [PMID: 32495744 DOI: 10.3354/dao03474] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Determining the origin of recurrent outbreaks of fish diseases occurring on fish farms is essential for disease prevention and control measures. In this study, we investigated the potential reservoir role of wild fish species living near salmonid farms which were regularly found to be positive for viral hemorrhagic septicemia virus (VHSV). In addition to VHSV, infectious hematopoietic necrosis virus (IHNV) was also isolated from several pike Esox lucius samples collected from a pond near the salmonid farms of interest. All isolates of VHSV and IHNV analyzed had 100% identical partial glycoprotein gene sequences. VHSV pike strain OO128-25 belonged to the Ia genotype and shared 99.1 to 99.5% nucleotide identity with strains recently isolated from the farms. IHNV pike strain OO121-8, European genotype, appeared to be different from strains from France characterized since the first isolation in 1987. Isolates representative of both viral species were highly virulent in rainbow trout Oncorhynchus mykiss. OO128-25 induced 65% mortality in pike fingerlings, whereas only weak mortality was observed with OO121-8, despite characteristic symptoms in infected fish. High levels of specific antibodies to VHSV and IHNV were detected in adult pike in the absence of clinical signs. Infection of rainbow trout in contact with experimentally VHSV- or IHNV-infected pike fingerlings indicates possible horizontal transmission. These results suggest that pike could act as a reservoir for VHSV and IHNV in the wild, providing additional evidence to explain viral persistence and resurgence in certain areas.
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Affiliation(s)
- J Cabon
- French Agency for Food, Environmental and Occupational Health and Safety, Ploufragan-Plouzané-Niort Laboratory, Viral Fish Diseases Unit, National Reference Laboratory for Regulated Fish Diseases, 29280 Plouzané, France
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10
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A chimeric recombinant infectious hematopoietic necrosis virus induces protective immune responses against infectious hematopoietic necrosis and infectious pancreatic necrosis in rainbow trout. Mol Immunol 2019; 116:180-190. [PMID: 31704501 DOI: 10.1016/j.molimm.2019.10.015] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Revised: 10/23/2019] [Accepted: 10/23/2019] [Indexed: 12/18/2022]
Abstract
Infectious pancreatic necrosis virus (IPNV) and infectious hematopoietic necrosis virus (IHNV) are two common viral pathogens that cause severe economic losses in all salmonid species in culture, but especially in rainbow trout. Although vaccines against both diseases have been commercialized in some countries, no such vaccines are available for them in China. In this study, a recombinant virus was constructed using the IHNV U genogroup Blk94 virus as a backbone vector to express the antigenic gene, VP2, from IPNV via the reverse genetics system. The resulting recombinant virus (rBlk94-VP2) showed stable biological characteristics as confirmed by virus growth kinetic analyses, pathogenicity analyses, indirect immunofluorescence assays and western blotting. Rainbow trout were immunized with rBlk94-VP2 and then challenged with the IPNV ChRtm213 strain and the IHNV Sn1203 strain on day 45 post-vaccination. A significantly higher survival rate against IHNV was obtained in the rBlk94-VP2 group on day 45 post-vaccination (86%) compared with the PBS mock immunized group (2%). Additionally, IPNV loads decreased significantly in the rBlk94-VP2 immunized group in the liver (28.6-fold to 36.5-fold), anterior kidney (21.7-fold to 44.2-fold), and spleen (14.9-fold to 22.7-fold), as compared with the PBS mock control group. The mRNA transcripts for several innate and adaptive immune-related proteins (IFN-γ, IFN-1, Mx-1, CD4, CD8, IgM, and IgT) were also significantly upregulated after rBlk94-VP2 vaccination, and neutralizing antibodies against both IHNV and IPNV were induced on day 45 post-vaccination. Collectively, our results suggest that this recombinant virus could be developed as a vaccine vector to protect rainbow trout against two or more diseases, and our approach lays the foundations for developing live vaccines for rainbow trout.
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Jalali SAH, Mohammadinezhad R, Mohammadi A, Latifian MH, Talebi M, Soleimanin-Zad S, Golkar P, Hemmatzadeh F. Molecular evolution and selection pressure analysis of infectious hematopoietic necrosis virus (IHNV) revealed the origin and phylogenetic relationship of Iranian isolates in recent epidemics in Iran. Virology 2019; 535:45-58. [PMID: 31272011 DOI: 10.1016/j.virol.2019.06.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 06/19/2019] [Accepted: 06/19/2019] [Indexed: 12/15/2022]
Abstract
Infectious hematopoietic necrosis virus (IHNV) is the causative agent for a lethal salmonid disease. In this study, we surveyed the IHNV's epidemiology, diversity and the origin of infection in Iran. Phylogenetic analysis revealed that Iranian isolates belonged to one of the two lineages of E genogroup. Subsequently, a combination of phylogenetic, antigenic and structural analysis was performed to investigate the evolution of E genogroup lineages. Site-specific analysis of the viral glycoprotein showed different co-evolving and positively selected sites in each lineage. Most of these sites were mapped to the predicted antigenic patches of the glycoprotein. Further characterization revealed E lineages can be differentiated, in part, by specific mutations at positions 91 and 130, which are located in the structurally flexible regions of the glycoprotein, suggesting a key adaptative role for these sites. These data may assist in better monitoring the emerging isolates in regions infected to IHNV from E genogroup.
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Affiliation(s)
- Seyed Amir Hossein Jalali
- Research Institute for Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran; Department of Natural Resources, Isfahan University of Technology, Isfahan, 84156-83111, Iran.
| | - Rezvan Mohammadinezhad
- Research Institute for Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
| | - Ashraf Mohammadi
- Human Viral vaccine Department, Razi Vaccine and Serum Research Institute (RVSRI), Hessark Karadj Agricultural Research, Education and Extension Organization (AREEO), Tehran, Iran
| | - Mohamad Hassan Latifian
- Department of Agricultural Biotechnology, College of Agriculture, Isfahan University of Technology, Isfahan, 8415683111, Iran
| | - Majid Talebi
- Research Institute for Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran; Department of Agricultural Biotechnology, College of Agriculture, Isfahan University of Technology, Isfahan, 8415683111, Iran
| | - Sabihe Soleimanin-Zad
- Research Institute for Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran; Department of Food Science and Technology, College of Agriculture, Isfahan University of Technology, Isfahan, Iran
| | - Pouran Golkar
- Research Institute for Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran
| | - Farhid Hemmatzadeh
- School of Animal and Veterinary Sciences, The University of Adelaide, Roseworthy, SA, Australia
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Hoferer M, Akimkin V, Skrypski J, Schütze H, Sting R. Improvement of a diagnostic procedure in surveillance of the listed fish diseases IHN and VHS. JOURNAL OF FISH DISEASES 2019; 42:559-572. [PMID: 30779211 DOI: 10.1111/jfd.12968] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Revised: 12/19/2018] [Accepted: 12/20/2018] [Indexed: 06/09/2023]
Abstract
Infectious haematopoietic necrosis (IHN) and viral haemorrhagic septicaemia (VHS) are OIE-listed and notifiable viral fish diseases which are controlled by eradication and surveillance programmes globally. The present study provides improved RT-qPCR procedures based on recently described OIE protocols. Improvements comprise the design of a new TaqMan® probe, replacing a TaqMan® MGB probe that turned out to show impaired binding. Reason for this is SNPs detected in the nucleoprotein N gene sequences of IHNV strains targeted by the RT-qPCR. Furthermore, the IHNV and VHSV RT-qPCR assays were realized as one-step and one-run procedures supplemented by an endogenous control system. The IHNV and VHSV RT-qPCR assays are characterized by a technical sensitivity of 19 and 190 gene equivalents (cRNA) and an analytical sensitivity of 2-7 and 13 TCID50 /ml, respectively. For verification purposes, 105 IHNV and 165 VHSV isolates and several non-targeted viral and bacterial pathogens were included and returned adequate results. However, in field samples divergent results left 14 samples of 154 undetected for IHNV and one sample of 127 for VHSV using cell culture. The study shows that RT-qPCR assays ensure facilitated and reliable testing on IHNV and VHSV in eradication and surveillance programmes.
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Affiliation(s)
- Marc Hoferer
- Chemisches und Veterinäruntersuchungsamt Stuttgart (Chemical and Veterinary Investigations Office Stuttgart), Fellbach, Germany
| | - Valerij Akimkin
- Chemisches und Veterinäruntersuchungsamt Stuttgart (Chemical and Veterinary Investigations Office Stuttgart), Fellbach, Germany
| | - Julia Skrypski
- Chemisches und Veterinäruntersuchungsamt Stuttgart (Chemical and Veterinary Investigations Office Stuttgart), Fellbach, Germany
| | - Heike Schütze
- Federal Research Institute for Animal Health, Institute of Infectology, Friedrich Loeffler Institute, Greifswald-Insel Riems, Germany
| | - Reinhard Sting
- Chemisches und Veterinäruntersuchungsamt Stuttgart (Chemical and Veterinary Investigations Office Stuttgart), Fellbach, Germany
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Kibenge FS. Emerging viruses in aquaculture. Curr Opin Virol 2019; 34:97-103. [PMID: 30711892 DOI: 10.1016/j.coviro.2018.12.008] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 12/23/2018] [Accepted: 12/28/2018] [Indexed: 11/25/2022]
Abstract
Aquaculture remains the world's fastest-growing sector producing food of animal origin. Unlike in terrestrial animal agriculture, in aquaculture both farmed and wild aquatic animals in the same water column experience the same virus challenges. Additionally, the burgeoning international aquaculture expansion and expanding global trade in live aquatic animals and their products have been accompanied by long distance geographical redistribution of aquatic animal species and their viruses. The outcome is a continuous emergence of viral diseases in aquaculture, which may be driven by virus factors, animal host factors, environmental factors, and/or anthropogenic factors. Examples of emerging viruses in aquaculture include viral haemorrhagic septicaemia virus, infectious haematopoietic necrosis virus, infectious salmon anaemia virus, piscine orthoreovirus, Tilapia lake virus, Covert mortality nodavirus, Shrimp hemocyte iridescent virus, and Abalone herpesvirus.
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Affiliation(s)
- Frederick Sb Kibenge
- Department of Pathology and Microbiology, Atlantic Veterinary College, University of Prince Edward Island, 550 University Ave., Charlottetown, P E I C1A 4P3, Canada.
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Xu L, Zhao J, Liu M, Kurath G, Breyta RB, Ren G, Yin J, Liu H, Lu T. Phylogeography and evolution of infectious hematopoietic necrosis virus in China. Mol Phylogenet Evol 2018; 131:19-28. [PMID: 30449717 DOI: 10.1016/j.ympev.2018.10.030] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 10/07/2018] [Indexed: 10/28/2022]
Abstract
Infectious hematopoietic necrosis virus (IHNV) is a well-known rhabdoviral pathogen of salmonid fish. In this study, a comprehensive analysis of 40 IHNV viruses isolated from thirteen fish farms in nine geographically dispersed Chinese provinces during 2012 to 2017 is presented. Identity of nucleotide and amino acid sequences among all the complete glycoprotein (G) genes from Chinese isolates was 98.0-100% and 96.7-100%, respectively. Coalescent phylogenetic analyses revealed that all the Chinese IHN virus characterized in this study were in a monophyletic clade that had a most recent common ancestor with the J Nagano (JN) subgroup within the J genogroup of IHNV. Within the Chinese IHNV clade isolates obtained over successive years from the same salmon fish farm clustered in strongly supported subclades, suggesting maintenance and diversification of virus over time within individual farms. There was also evidence for regional virus transmission within provinces, and some cases of longer distance transmission between distant provinces, such as Gansu and Yunnan. The data demonstrated that IHNV has evolved into a new subgroup in salmon farm environments in China, and IHNV isolates are undergoing molecular evolution within fish farms. We suggest that Chinese IHNV comprises a separate JC subgroup within the J genogroup of IHNV.
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Affiliation(s)
- Liming Xu
- Heilongjiang River Fishery Research Institute Chinese Academy of Fishery Sciences, Harbin 150070, PR China.
| | - Jingzhuang Zhao
- Heilongjiang River Fishery Research Institute Chinese Academy of Fishery Sciences, Harbin 150070, PR China
| | - Miao Liu
- Heilongjiang River Fishery Research Institute Chinese Academy of Fishery Sciences, Harbin 150070, PR China.
| | - Gael Kurath
- Western Fisheries Research Center, U.S. Geological Survey, 6505 NE 65th Street, Seattle, WA 98115, USA.
| | - Rachel B Breyta
- Western Fisheries Research Center, U.S. Geological Survey, 6505 NE 65th Street, Seattle, WA 98115, USA; University of Washington, School of Aquatic and Fishery Sciences, Seattle, WA 98195, USA.
| | - Guangming Ren
- Heilongjiang River Fishery Research Institute Chinese Academy of Fishery Sciences, Harbin 150070, PR China.
| | - Jiasheng Yin
- Heilongjiang River Fishery Research Institute Chinese Academy of Fishery Sciences, Harbin 150070, PR China.
| | - Hongbai Liu
- Heilongjiang River Fishery Research Institute Chinese Academy of Fishery Sciences, Harbin 150070, PR China
| | - Tongyan Lu
- Heilongjiang River Fishery Research Institute Chinese Academy of Fishery Sciences, Harbin 150070, PR China.
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