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Yamashita M, Iwamoto S, Ochiai M, Yamamoto A, Sudo K, Narushima R, Nagasaka T, Saito A, Oba M, Omatsu T, Mizutani T, Yamamoto K. Pathogenicity of genotype 2.1 classical swine fever virus isolated from Japan in 2019 in pigs. Microbiol Immunol 2024. [PMID: 38946035 DOI: 10.1111/1348-0421.13160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Revised: 05/13/2024] [Accepted: 06/09/2024] [Indexed: 07/02/2024]
Abstract
Classical swine fever (CSF) re-emerged in Japan in 2018 for the first time in 26 years. The disease has been known to be caused by a moderately pathogenic virus, rather than the highly pathogenic virus that had occurred in the past. However, the underlying pathophysiology remains unknown. This study conducted an experimental challenge on specific pathogen-free (SPF) pigs in a naïve state for 2, 4, and 6 weeks and confirmed the disease state during each period by clinical observation, virus detection, and pathological necropsy. We revealed the pathological changes and distribution of pathogens and virus-specific antibodies at each period after virus challenge. These results were comprehensively analyzed and approximately 70% of the pigs recovered, especially at 4- and 6-week post-virus challenge. This study provides useful information for future countermeasures against CSF by clarifying the pathogenicity outcomes in unvaccinated pigs with moderately pathogenic genotype 2.1 virus.
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Affiliation(s)
- Maiko Yamashita
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
- Center for Infectious Disease Epidemiology and Prevention Research, Tokyo University of Agriculture and Technology (Cooperative Division of Veterinary Sciences), Tokyo, Japan
| | - Shoko Iwamoto
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
| | - Mariko Ochiai
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
| | - Atsushi Yamamoto
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
| | - Kasumi Sudo
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
- Livestock Industry Bureau, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
| | - Rie Narushima
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
| | - Takao Nagasaka
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
| | - Akito Saito
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
- Exotic Diseases Research Station, National Institute of Animal Health, National Agriculture and Food Research Organization, Tokyo, Japan
| | - Mami Oba
- Center for Infectious Disease Epidemiology and Prevention Research, Tokyo University of Agriculture and Technology (Cooperative Division of Veterinary Sciences), Tokyo, Japan
| | - Tsutomu Omatsu
- Center for Infectious Disease Epidemiology and Prevention Research, Tokyo University of Agriculture and Technology (Cooperative Division of Veterinary Sciences), Tokyo, Japan
| | - Tetsuya Mizutani
- Center for Infectious Disease Epidemiology and Prevention Research, Tokyo University of Agriculture and Technology (Cooperative Division of Veterinary Sciences), Tokyo, Japan
| | - Kinya Yamamoto
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, Tokyo, Japan
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Li F, Yu H, Qi A, Zhang T, Huo Y, Tu Q, Qi C, Wu H, Wang X, Zhou J, Hu L, Ouyang H, Pang D, Xie Z. Regulatory Non-Coding RNAs during Porcine Viral Infections: Potential Targets for Antiviral Therapy. Viruses 2024; 16:118. [PMID: 38257818 PMCID: PMC10818342 DOI: 10.3390/v16010118] [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: 12/05/2023] [Revised: 01/07/2024] [Accepted: 01/10/2024] [Indexed: 01/24/2024] Open
Abstract
Pigs play important roles in agriculture and bio-medicine; however, porcine viral infections have caused huge losses to the pig industry and severely affected the animal welfare and social public safety. During viral infections, many non-coding RNAs are induced or repressed by viruses and regulate viral infection. Many viruses have, therefore, developed a number of mechanisms that use ncRNAs to evade the host immune system. Understanding how ncRNAs regulate host immunity during porcine viral infections is critical for the development of antiviral therapies. In this review, we provide a summary of the classification, production and function of ncRNAs involved in regulating porcine viral infections. Additionally, we outline pathways and modes of action by which ncRNAs regulate viral infections and highlight the therapeutic potential of artificial microRNA. Our hope is that this information will aid in the development of antiviral therapies based on ncRNAs for the pig industry.
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Affiliation(s)
- Feng Li
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Hao Yu
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Aosi Qi
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Tianyi Zhang
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Yuran Huo
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Qiuse Tu
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Chunyun Qi
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Heyong Wu
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Xi Wang
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Jian Zhou
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Lanxin Hu
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
| | - Hongsheng Ouyang
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
- Chongqing Research Institute, Jilin University, Chongqing 401120, China
- Chongqing Jitang Biotechnology Research Institute Co., Ltd., Chongqing 401120, China
| | - Daxin Pang
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
- Chongqing Research Institute, Jilin University, Chongqing 401120, China
- Chongqing Jitang Biotechnology Research Institute Co., Ltd., Chongqing 401120, China
| | - Zicong Xie
- Key Laboratory of Zoonosis Research, Ministry of Education, College of Animal Sciences, Jilin University, Changchun 130062, China; (F.L.); (H.Y.); (A.Q.); (T.Z.); (Y.H.); (Q.T.); (C.Q.); (H.W.); (X.W.); (J.Z.); (L.H.); (H.O.)
- Chongqing Research Institute, Jilin University, Chongqing 401120, China
- Chongqing Jitang Biotechnology Research Institute Co., Ltd., Chongqing 401120, China
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Robert E, Goonewardene K, Lamboo L, Perez O, Goolia M, Lewis C, Erdelyan CNG, Lung O, Handel K, Moffat E, Embury-Hyatt C, Amaya NN, Parra CPC, Rueda DCG, Monroy MAR, Clavijo A, Ambagala A. Molecular and Pathological Characterization of Classical Swine Fever Virus Genotype 2 Strains Responsible for the 2013-2018 Outbreak in Colombia. Viruses 2023; 15:2308. [PMID: 38140549 PMCID: PMC10747092 DOI: 10.3390/v15122308] [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: 09/01/2023] [Revised: 11/07/2023] [Accepted: 11/16/2023] [Indexed: 12/24/2023] Open
Abstract
Classical swine fever (CSF) is a highly contagious transboundary viral disease of domestic and wild pigs. Despite mass vaccination and continuous eradication programs, CSF remains endemic in Asia, some countries in Europe, the Caribbean and South America. Since June 2013, Northern Colombia has reported 137 CSF outbreaks, mostly in backyard production systems with low vaccination coverage. The purpose of this study was to characterize the virus responsible for the outbreak. Phylogenetic analysis based on the full-length E2 sequence shows that the virus is closely related to CSF virus (CSFV) genotype 2.6 strains circulating in Southeast Asia. The pathotyping experiment suggests that the virus responsible is a moderately virulent strain. The 190 nucleotide stretch of the E2 hypervariable region of these isolates also shows high similarity to the CSFV isolates from Colombia in 2005 and 2006, suggesting a common origin for the CSF outbreaks caused by genotype 2.6 strains. The emergence of genotype 2.6 in Colombia suggests a potential transboundary spread of CSFV from Asia to the Americas, complicating the ongoing CSF eradication efforts in the Americas, and emphasizes the need for continuous surveillance in the region.
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Affiliation(s)
- Erin Robert
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Kalhari Goonewardene
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Lindsey Lamboo
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Orlando Perez
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Melissa Goolia
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Charles Lewis
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Cassidy N. G. Erdelyan
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Oliver Lung
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Katherine Handel
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Estella Moffat
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Carissa Embury-Hyatt
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Nancy Naranjo Amaya
- National Veterinary Laboratory, Instituto Colombiano Agropecurio, Bogota 110911, DC, Colombia; (N.N.A.); (C.P.C.P.); (D.C.G.R.); (M.A.R.M.)
| | - Claudia Patricia Calderón Parra
- National Veterinary Laboratory, Instituto Colombiano Agropecurio, Bogota 110911, DC, Colombia; (N.N.A.); (C.P.C.P.); (D.C.G.R.); (M.A.R.M.)
| | - Diana Cristina Gómez Rueda
- National Veterinary Laboratory, Instituto Colombiano Agropecurio, Bogota 110911, DC, Colombia; (N.N.A.); (C.P.C.P.); (D.C.G.R.); (M.A.R.M.)
| | - Maria Antonia Rincón Monroy
- National Veterinary Laboratory, Instituto Colombiano Agropecurio, Bogota 110911, DC, Colombia; (N.N.A.); (C.P.C.P.); (D.C.G.R.); (M.A.R.M.)
| | - Alfonso Clavijo
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
| | - Aruna Ambagala
- Canadian Food Inspection Agency, National Centre for Foreign Animal Disease, Winnipeg, MB R3E 3R2, Canada; (E.R.); (K.G.); (L.L.); (O.P.); (M.G.); (C.L.); (C.N.G.E.); (O.L.); (K.H.); (E.M.); (C.E.-H.); (A.C.)
- Department of Animal Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada
- Department of Comparative Biology and Experimental Medicine, Faculty of Veterinary Medicine, University of Calgary, Calgary, AB T2N 1N4, Canada
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Singh N, Batra K, Chaudhary D, Punia M, Kumar A, Maan NS, Maan S. Prevalence of porcine viral respiratory diseases in India. Anim Biotechnol 2023; 34:1642-1654. [PMID: 35112631 DOI: 10.1080/10495398.2022.2032117] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The pig industry is growing rapidly in India and contributes a major share of growth in the livestock sector. Over the last few years, there is a gradual increase in the adoption of pigs for production by economically weaker sections of the country. However, this production is affected by many respiratory diseases which are responsible for significant economic loss. The occurrence and impact of these diseases are still under-documented. The four important pathogens including porcine circovirus type 2 (PCV2), porcine reproductive and respiratory syndrome virus (PRRSV), swine influenza A viruses (SIV) and classical swine fever virus (CSFV) are documented here. These diseases are highly devastating in nature and frequent outbreaks have been reported from different parts of the country. The rapid and specific diagnosis, effective prevention and control measures are required for the eradication of these diseases which is urgently required for the growth of the pig industry. This review highlights the prevalence, epidemiology, diagnostics and information gaps on important respiratory viral pathogens of pigs reported from different parts of India. This review also emphasizes the importance of these viral diseases and the urgent need to develop vaccines and effective measures for the eradication of these diseases.
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Affiliation(s)
- Neha Singh
- College of Veterinary Sciences, Lala Lajpat Rai University of Veterinary and Animal Science (LUVAS), Hisar, India
| | - Kanisht Batra
- College of Veterinary Sciences, Lala Lajpat Rai University of Veterinary and Animal Science (LUVAS), Hisar, India
| | - Deepika Chaudhary
- College of Veterinary Sciences, Lala Lajpat Rai University of Veterinary and Animal Science (LUVAS), Hisar, India
| | - Monika Punia
- Department of Biotechnology, Ch. Devi Lal University, Sirsa, India
| | - Aman Kumar
- College of Veterinary Sciences, Lala Lajpat Rai University of Veterinary and Animal Science (LUVAS), Hisar, India
| | - Narender Singh Maan
- College of Veterinary Sciences, Lala Lajpat Rai University of Veterinary and Animal Science (LUVAS), Hisar, India
| | - Sushila Maan
- College of Veterinary Sciences, Lala Lajpat Rai University of Veterinary and Animal Science (LUVAS), Hisar, India
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Huang YL, Meyer D, Postel A, Tsai KJ, Liu HM, Yang CH, Huang YC, Chang HW, Deng MC, Wang FI, Becher P, Crooke H, Chang CY. Identification of neutralizing epitopes on the D/A domain of the E2 glycoprotein of classical swine fever virus. Virus Res 2023; 336:199209. [PMID: 37633596 PMCID: PMC10485151 DOI: 10.1016/j.virusres.2023.199209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 08/19/2023] [Accepted: 08/23/2023] [Indexed: 08/28/2023]
Abstract
Classical swine fever virus (CSFV) shares high antigenic homology with other members of the genus Pestivirus. Because several pestivirus species can also infect swine, eliciting cross-reactive antibodies, it is important to define CSFV-specific epitopes for the differential diagnosis of classical swine fever (CSF) by serology. For this purpose, epitope mapping of seven monoclonal antibodies (mAbs), recognizing sites on the D/A domain of glycoprotein E2, was performed using recombinant expressed antigenic domains and mutants of E2, as well as an overlapping peptide library. Three CSFV-specific epitopes, i.e., 780-IEEMGDDFGFGLCPF-794, 810-NGSAFYLVCPIGWTG-824, and 846-REKPF-850, were identified within the D/A domain of E2. Site-directed mutagenesis further confirmed that residues 783-MGD-785, 789-FGLCPF-794, 813-AFYLVCPIGWTG-824, and 846-REK-848 were critical residues in these regions. In addition, a F789S difference within the epitope 780-IEEMGDDFGFGLCPF-794 was responsible for the absence of binding of two mAbs to the E2 protein of the live attenuated CSFV vaccine strain Riems. Structural modeling revealed that, the three epitopes are located near each other, suggesting that they may form a more complex conformational epitope on the D/A domain in vivo. Six of the mAbs neutralized viruses of diverse genotypes, indicating that the target epitopes are involved in virus interaction with cells. The binding of CSFV to cells was significantly reduced after pre-incubation with either truncated E2 proteins comprising the D/A domain or with the CSFV-specific mAbs targeting the domain D/A. These epitopes identified on the D/A domain are important targets for virus neutralization that might be involved in the early steps of CSFV infection. These findings reveal potential candidates for improving the differential diagnosis of pestiviruses by serology.
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Affiliation(s)
- Yu-Liang Huang
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Denise Meyer
- WOAH Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Alexander Postel
- WOAH Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Kuo-Jung Tsai
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Hsin-Meng Liu
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Chia-Huei Yang
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Yu-Chun Huang
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Hui-Wen Chang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Ming-Chung Deng
- WOAH Reference Laboratory for Classical Swine Fever, Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tamsui, New Taipei City 25158, Taiwan
| | - Fun-In Wang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Paul Becher
- WOAH Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany
| | - Helen Crooke
- WOAH Reference Laboratory for Classical Swine Fever, Animal and Plant Health Agency, New Haw, Surrey, KT15 3NB, UK.
| | - Chia-Yi Chang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan.
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6
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Liu HM, Deng MC, Huang YL, Tsai KJ, Chang HW, Chang CY. In vivo characterization of the superior fitness of classical swine fever virus genotype 2.1 to genotype 3.4. Vet Microbiol 2023; 285:109854. [PMID: 37633061 DOI: 10.1016/j.vetmic.2023.109854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 08/13/2023] [Accepted: 08/21/2023] [Indexed: 08/28/2023]
Abstract
Classical swine fever (CSF), caused by classical swine fever virus (CSFV), is a highly contagious disease in pigs. In Taiwan, the emerging genotype 2.1 (G2.1) CSFV caused sporadic outbreaks in 1994 and replaced the previous G3.4 CSFV in the field. The shift of CSFV genotypes to G2 CSFV was also observed in several CSFV-affected countries. The present study aimed to explore the mechanism of the genotype shift of CSFV. Two groups of specific pathogen-free (SPF) pigs were first inoculated with either G2.1 or G3.4 CSFV (single-inoculated group) and housed together with naïve SPF pigs (cohabitating group). The results showed that peak viremia, viral loads in blood and tissues, and viral shedding of G2.1 were consistently higher than those of G3.4 CSFV in single-inoculated and cohabitating pigs. The phenomenon of superinfection exclusion (SIE), characterized by the prevention of secondary infection by a primary infection, was readily observed in CSFV single-inoculated pigs. Interestingly, coinfection of both genotypes of CSFV was observed in 3 out of 4 cohabitating pigs, while only one pig was infected with G2.1 CSFV alone. These findings suggest that the genetic shift in CSFV in the field may be in part the consequence of SIE.
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Affiliation(s)
- Hsin-Meng Liu
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Rd., Taipei 106319, Taiwan, ROC; Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan, ROC
| | - Ming-Chung Deng
- Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan, ROC
| | - Yu-Liang Huang
- Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan, ROC
| | - Kuo-Jung Tsai
- Veterinary Research Institute, Ministry of Agriculture, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan, ROC
| | - Hui-Wen Chang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Rd., Taipei 106319, Taiwan, ROC
| | - Chia-Yi Chang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Rd., Taipei 106319, Taiwan, ROC.
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E-2 Glycoprotein Structural Variations Analysed within the CSFV 2.2. Genogroup in a “Closed Grid” Sampling Study from Meghalaya, India. MICROBIOLOGY RESEARCH 2023. [DOI: 10.3390/microbiolres14010027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023] Open
Abstract
CSF is enzootic in most of pig-producing states, particularly in the NorthEastern (NE) region of India. In this study, a total of 249 sera and 190 tissue samples were collected from different parts of Meghalaya. Samples were processed by ELISA and RT-PCR for serological and molecular diagnosis. Representative positive samples from the Khasi Hills region were selected for sequencing and “close grid” phylogenetic relationship using partial genomic regions of 5′UTR and E2. High seroprevalence (74.7%) of CSFV was recorded. Detection of the CSFV genome in serologically positive serum samples and tissue samples was 61.29% and 18.94%, respectively. BLAST and phylogenetic analyses indicate the clustering of all the field samples in subgroup 2.2, with high identity with EF014334 from China. Molecular structural modelling of the E2 partial sequence using representative sequences MG563797 from Meghalaya and EF014334 from China indicate potential changes in the protein motif and its conformation, which may explain the emergence of subgroup 2.2 CSFV replacing the predominant subgroup 1.1 viruses in NorthEast India. The epidemiological information presented in this study may be helpful for determination of disease incidence in this region, whereas the virus profile may be useful for framing disease control programs.
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Chang CY, Tsai KJ, Deng MC, Wang FI, Liu HM, Tsai SH, Tu YC, Lin NN, Huang YL. Transmission of Classical Swine Fever Virus in Cohabitating Piglets with Various Immune Statuses Following Attenuated Live Vaccine. Animals (Basel) 2023; 13:ani13030368. [PMID: 36766258 PMCID: PMC9913813 DOI: 10.3390/ani13030368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Revised: 01/18/2023] [Accepted: 01/19/2023] [Indexed: 01/24/2023] Open
Abstract
Classical swine fever (CSF) is a systemic hemorrhagic disease affecting domestic pigs and wild boars. The modified live vaccine (MLV) induces quick and solid protection against CSF virus (CSFV) infection. Maternally derived antibodies (MDAs) via colostrum could interfere with the MLV's efficacy, leading to incomplete protection against CSFV infection for pigs. This study investigated CSFV transmission among experimental piglets with various post-MLV immune statuses. Nineteen piglets, 18 with MDAs and 1 specific-pathogen-free piglet infected with CSFV that served as the CSFV donor, were cohabited with piglets that had or had not been administered the MLV. Five-sixths of the piglets with MDAs that had been administered one dose of MLV were fully protected from contact transmission from the CSFV donor and did not transmit CSFV to the piglets secondarily exposed through cohabitation. Cell-mediated immunity, represented by the anti-CSFV-specific interferon-γ-secreting cells, was key to viral clearance and recovery. After cohabitation with a CSFV donor, the unvaccinated piglets with low MDA levels exhibited CSFV infection and spread CSFV to other piglets through contact; those with high MDA levels recovered but acted as asymptomatic carriers. In conclusion, MLV still induces solid immunity in commercial herds under MDA interference and blocks CSFV transmission within these herds.
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Affiliation(s)
- Chia-Yi Chang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Kuo-Jung Tsai
- Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan
| | - Ming-Chung Deng
- Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan
| | - Fun-In Wang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan
| | - Hsin-Meng Liu
- Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan
| | - Shu-Hui Tsai
- Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan
| | - Yang-Chang Tu
- Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan
| | - Nien-Nong Lin
- Bureau of Animal and Plant Health Inspection and Quarantine, Council of Agriculture, Executive Yuan, 9F., No. 100, Sec. 2, Heping-West Road, Zhongzheng Dist., Taipei 10060, Taiwan
| | - Yu-Liang Huang
- Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan
- Correspondence: ; Tel.: +886-2-2621-2111 (ext. 306)
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9
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Chen WT, Liu HM, Chang CY, Deng MC, Huang YL, Chang YC, Chang HW. Cross-reactivities and cross-neutralization of different envelope glycoproteins E2 antibodies against different genotypes of classical swine fever virus. Front Vet Sci 2023; 10:1169766. [PMID: 37180072 PMCID: PMC10172653 DOI: 10.3389/fvets.2023.1169766] [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: 02/20/2023] [Accepted: 04/10/2023] [Indexed: 05/15/2023] Open
Abstract
Classical swine fever (CSF) is a highly contagious swine disease caused by the classical swine fever virus (CSFV), wreaking havoc on global swine production. The virus is divided into three genotypes, each comprising 4-7 sub-genotypes. The major envelope glycoprotein E2 of CSFV plays an essential role in cell attachment, eliciting immune responses, and vaccine development. In this study, to study the cross-reaction and cross-neutralizing activities of antibodies against different genotypes (G) of E2 glycoproteins, ectodomains of G1.1, G2.1, G2.1d, and G3.4 CSFV E2 glycoproteins from a mammalian cell expression system were generated. The cross-reactivities of a panel of immunofluorescence assay-characterized serum derived from pigs with/without a commercial live attenuated G1.1 vaccination against different genotypes of E2 glycoproteins were detected by ELISA. Our result showed that serum against the LPCV cross-reacted with all genotypes of E2 glycoproteins. To evaluate cross-neutralizing activities, hyperimmune serum from different CSFV E2 glycoprotein-immunized mice was also generated. The result showed that mice anti-E2 hyperimmune serum exhibited better neutralizing abilities against homologous CSFV than heterogeneous viruses. In conclusion, the results provide information on the cross-reactivity of antibodies against different genogroups of CSFV E2 glycoproteins and suggest the importance of developing multi-covalent subunit vaccines for the complete protection of CSF.
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Affiliation(s)
- Wei-Tao Chen
- School of Veterinary Medicine National Taiwan University, Taipei, Taiwan
- School of Veterinary Medicine, Graduate Institute of Molecular and Comparative Pathobiology, National Taiwan University, Taipei, Taiwan
| | - Hsin-Meng Liu
- School of Veterinary Medicine National Taiwan University, Taipei, Taiwan
- School of Veterinary Medicine, Graduate Institute of Molecular and Comparative Pathobiology, National Taiwan University, Taipei, Taiwan
- College of Bioresources and Agriculture, Animal Health Research Institute, Tamsui, Taiwan
| | - Chia-Yi Chang
- School of Veterinary Medicine National Taiwan University, Taipei, Taiwan
| | - Ming-Chung Deng
- College of Bioresources and Agriculture, Animal Health Research Institute, Tamsui, Taiwan
| | - Yu-Liang Huang
- College of Bioresources and Agriculture, Animal Health Research Institute, Tamsui, Taiwan
| | - Yen-Chen Chang
- School of Veterinary Medicine National Taiwan University, Taipei, Taiwan
- School of Veterinary Medicine, Graduate Institute of Molecular and Comparative Pathobiology, National Taiwan University, Taipei, Taiwan
| | - Hui-Wen Chang
- School of Veterinary Medicine National Taiwan University, Taipei, Taiwan
- School of Veterinary Medicine, Graduate Institute of Molecular and Comparative Pathobiology, National Taiwan University, Taipei, Taiwan
- *Correspondence: Hui-Wen Chang,
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10
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Yuan M, Yang X, Zhang X, Zhao X, Abid M, Qiu HJ, Li Y. Different Types of Vaccines against Pestiviral Infections: "Barriers" for " Pestis". Viruses 2022; 15:2. [PMID: 36680043 PMCID: PMC9860862 DOI: 10.3390/v15010002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 12/06/2022] [Accepted: 12/16/2022] [Indexed: 12/24/2022] Open
Abstract
The genus Pestivirus of the family Flaviviridae mainly comprises classical swine fever virus (CSFV), bovine viral diarrhea virus 1 (BVDV-1), BVDV-2, border disease virus (BDV), and multiple new pestivirus species such as atypical porcine pestivirus (APPV), giraffe pestivirus, and antelope pestivirus. Pestiviruses cause infectious diseases, resulting in tremendous economic losses to animal husbandry. Different types of pestivirus vaccines have been developed to control and prevent these important animal diseases. In recent years, pestiviruses have shown great potential as viral vectors for developing multivalent vaccines. This review analyzes the advantages and disadvantages of various pestivirus vaccines, including live attenuated pestivirus strains, genetically engineered marker pestiviruses, and pestivirus-based multivalent vaccines. This review provides new insights into the development of novel vaccines against emerging pestiviruses, such as APPV and ovine pestivirus.
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Affiliation(s)
- Mengqi Yuan
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
| | - Xiaoke Yang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
| | - Xin Zhang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
- College of Animal Science and Veterinary Medicine, Henan Institute of Science and Technology, Xinxiang 453003, China
| | - Xiaotian Zhao
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
- Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry, College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Tianjin 300384, China
| | - Muhammad Abid
- Viral Oncogenesis Group, The Pirbright Institute, Ash Road, Pirbright, Woking, Surrey GU24 0NF, UK
| | - Hua-Ji Qiu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
- Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry, College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Tianjin 300384, China
| | - Yongfeng Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150069, China
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11
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Li W, Zhang Z, Zhang L, Zhou Q, Li Y, Yi L, Ding H, Zhao M, Chen J, Fan S. Interaction of SERINC5 and IFITM1/2/3 regulates the autophagy-apoptosis-immune network under CSFV infection. Virulence 2022; 13:1720-1740. [PMID: 36205528 PMCID: PMC9553151 DOI: 10.1080/21505594.2022.2127241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The host restriction factor serine incorporator 5 (SERINC5) plays a key role in inhibiting viral activity and has been shown to inhibit classical swine fever virus (CSFV) infection. However, the action of SERINC5 in the interaction between host cells and CSFV remains poorly understood. This study found that SERINC5 represses CSFV-induced autophagy through MAPK1/3-mTOR and AKT-mTOR signalling pathways. Further research showed that SERINC5 promotes apoptosis by repressing autophagy. Likewise, it was demonstrated that SERINC5 interacting proteins IFITM1/2/3 inhibit CSFV replication and regulate autophagy in a lysosomal-associated membrane protein LAMP1-dependent manner. In addition, IFITM1/2/3 interference promotes the NF-κB signalling pathway for potential immunoregulation by inhibiting autophagy. Finally, the functional silencing of IFITM1/2/3 genes was demonstrated to enhance the inhibitory effect of SERINC5 on autophagy. Taken together, These data uncover a novel mechanism through SERINC5 and its interacting proteins IFITM1/2/3, which mediates CSFV replication, and provides new avenues for controlling CSFV.
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Affiliation(s)
- Wenhui Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, South China Agricultural University, Guangzhou, China.,Key Laboratory of Animal Vaccine Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China.,College of Food Science and Engineering, Shandong Agricultural University, Taian, China
| | - Zilin Zhang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, South China Agricultural University, Guangzhou, China.,Key Laboratory of Animal Vaccine Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Liangliang Zhang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, South China Agricultural University, Guangzhou, China.,Key Laboratory of Animal Vaccine Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Qingfeng Zhou
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Wen' s Foodstuffs Group Co, Ltd, Guangdong, China
| | - Yuwan Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, South China Agricultural University, Guangzhou, China.,Key Laboratory of Animal Vaccine Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Lin Yi
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, South China Agricultural University, Guangzhou, China.,Key Laboratory of Animal Vaccine Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Hongxing Ding
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, South China Agricultural University, Guangzhou, China.,Key Laboratory of Animal Vaccine Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Mingqiu Zhao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, South China Agricultural University, Guangzhou, China.,Key Laboratory of Animal Vaccine Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Jinding Chen
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, South China Agricultural University, Guangzhou, China.,Key Laboratory of Animal Vaccine Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
| | - Shuangqi Fan
- College of Veterinary Medicine, South China Agricultural University, Guangzhou, China.,Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, South China Agricultural University, Guangzhou, China.,Key Laboratory of Animal Vaccine Development, Ministry of Agriculture and Rural Affairs, Guangzhou, China
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12
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Zhang Y, Li Q, Wang R, Wang L, Wang X, Luo J, Xing G, Zheng G, Wan B, Guo J, Zhang G. Differentiation of Classical Swine Fever Virus Virulent and Vaccine Strains by CRISPR/Cas13a. Microbiol Spectr 2022; 10:e0089122. [PMID: 36173294 PMCID: PMC9603908 DOI: 10.1128/spectrum.00891-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 07/10/2022] [Indexed: 12/30/2022] Open
Abstract
As a notifiable terrestrial and aquatic animal disease listed by World Organisation for Animal Health (formerly the Office International des Epizooties [OIE]), classical swine fever (CSF) has caused great economic losses to the swine industry worldwide during recent decades. Differentiation of infected and vaccinated animals (DIVA) is urgent for eradication of CSF. In this study, a diagnostic platform based on CRISPR/Cas13a was established with the ability to differentiate between classical swine fever virus (CSFV) virulent and vaccine strains. In combination with reverse transcription recombinase-aided amplification (RT-RAA), the detection limit for CSFV synthetic RNA templates reached 3.0 × 102 copies/μL. In addition, with boiling and chemical reduction, heating unextracted diagnostic samples to obliterate nucleases (HUDSON) treatment was introduced to inactivate nucleases and release viral genome, achieving robust pretreatment of tested sample before CRISPR/Cas13a detection without the need to extract viral nucleic acids. HUDSON-RT-RAA-CRISPR/Cas13a can directly detect cell cultures of virulent Shimen strain and vaccine hog cholera lapinized virus (HCLV) strain, with the detection limit of 3.5 × 102 copies/μL and 1.8 × 102 copies/μL, respectively, which was equally sensitive to nested PCR (nPCR) and 100 times more sensitive than antigen enzyme-linked immunosorbent assay (ELISA). Meanwhile, HUDSON-RT-RAA-CRISPR/Cas13a showed no cross-reactivity with bovine viral diarrhea virus (BVDV), atypical porcine pestivirus (APPV), porcine reproductive and respiratory syndrome virus (PRRSV), porcine epidemic diarrhea virus (PEDV), African swine fever virus (ASFV), pseudorabies virus (PRV), and porcine circovirus 2 (PCV2), exhibiting good specificity. At last, a total of 50 pig spleen samples with suspected clinical signs were also assayed with HUDSON-RT-RAA-CRISPR/Cas13a, nPCR, and antigen ELISA in parallel. HUDSON-RT-RAA-CRISPR/Cas13a showed 100.0% with nPCR and 82.0% coincident rate with antigen ELISA, respectively. IMPORTANCE Classical swine fever (CSF) is a World Organisation for Animal Health (formerly the Office International des Epizooties [OIE]) notifiable terrestrial and aquatic animal disease, causing great economic losses to the swine industry worldwide during the past decades. Due to the use of the most effective and safe attenuated live vaccine for CSF prevention, differentiation of infected and vaccinated pigs is vital work, as well as a bottleneck for eradication of CSF. Methods with the ability to precisely differentiate classical swine fever virus (CSFV) virulent strains from vaccine strain hog cholera lapinized virus (HCLV) are urgently needed. Combining the high sensitivity of isothermal recombinase-aided amplification (RAA) with the accurate molecular sensing ability of Cas13a, we presented a novel method for CSFV detection without the need to extract viral nucleic acids, which showed great advantage to traditional detection methods for precise differentiation of CSFV virulent strains and vaccine strain, providing a novel powerful tool for CSF eradication.
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Affiliation(s)
- Yuhang Zhang
- International Joint Research Center of National Animal Immunology, College of Veterinary Medicine, Henan Agricultural University, Zhengzhou, China
| | - Qingmei Li
- Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, China
| | - Ruining Wang
- Henan University of Animal Husbandry and Economy, College of Veterinary Medicine, Zhengzhou, China
| | - Li Wang
- Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, China
| | - Xun Wang
- International Joint Research Center of National Animal Immunology, College of Veterinary Medicine, Henan Agricultural University, Zhengzhou, China
| | - Jun Luo
- Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, China
| | - Guangxu Xing
- Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, China
| | - Guanmin Zheng
- Public Health and Preventive Medicine Teaching and Research Center, Henan University of Chinese Medicine, Zhengzhou, China
| | - Bo Wan
- International Joint Research Center of National Animal Immunology, College of Veterinary Medicine, Henan Agricultural University, Zhengzhou, China
| | - Junqing Guo
- Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, China
| | - Gaiping Zhang
- International Joint Research Center of National Animal Immunology, College of Veterinary Medicine, Henan Agricultural University, Zhengzhou, China
- Key Laboratory of Animal Immunology, Henan Academy of Agricultural Sciences, Zhengzhou, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonose, Yangzhou University, Yangzhou, China
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13
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Haplotype of Wild Korean Boars Infected by Classical Swine Fever Virus Subgenotype 2.1d. Animals (Basel) 2022; 12:ani12192670. [PMID: 36230411 PMCID: PMC9559489 DOI: 10.3390/ani12192670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 09/29/2022] [Accepted: 10/01/2022] [Indexed: 11/05/2022] Open
Abstract
Simple Summary Classical swine fever is a highly contagious disease that infects both domestic pigs and wild boars. Classical swine fever virus (CSFV) has not been detected in domestic pigs in South Korea since 2016, but has been increasing in wild boars since 2017. Two cases of CSFV subgenotype 2.1d were detected in wild Korean boars in 2011, but then no cases were detected until 2016; however, 16 cases of CSFV were detected between 2017 and 2019. In this study, we report seven CSFV-positive samples obtained from wild boars in 2020. In addition, although 13 mtDNA haplotypes were detected in wild boars in South Korea, all 25 cases of CSFV that occurred in wild boars between 2011 and 2020 were detected in animals with haplotype 01. Abstract Classical swine fever virus (CSFV) is one of the major pathogens that causes severe economic damage to the swine industry. Circulation of CSFV in wild boars carries the potential risk of reintroducing the virus into CSFV-free pig farms. This study carried out a genetic analysis of CSFV isolates from wild boars and analyzed the mtDNA haplotypes of the wild boars. Blood samples (n = 2140) from wild Korean boars captured in 2020 were subjected to qRT-PCR to detect CSFV, which was classified as subgenotype 2.1d based on phylogenetic analysis. CSFV had been detected in wild boars only in northern regions (Gangwon and Gyeonggi) of South Korea between 2011 and 2019. However, CSFV was identified in wild boars in the more southern regions (Chungbuk and Gyeongbuk) in 2020. Based on mitochondrial DNA analysis, all wild boars with CSFV were haplotype 01 (H01). Thus, we presume that the H01 haplotype is more susceptible to CSFV. In the future, infection of wild boars by CSFV is expected to occur intermittently every year, and we predict that most wild boars infected with CSFV will be haplotype H01.
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14
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Chen D, Kang H, Tuo T, Wang L, Xia Y, Zhang Y, Zhou L, Ge X, Han J, Guo X, Yang H. Astragalus polysaccharide alleviated the inhibition of CSFV C-strain replication caused by PRRSV via the TLRs/NF‑κB/TNF-α pathways. Virus Res 2022; 319:198854. [PMID: 35788015 DOI: 10.1016/j.virusres.2022.198854] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Revised: 06/26/2022] [Accepted: 06/29/2022] [Indexed: 12/22/2022]
Abstract
It is a common phenomenon that PRRSV infection can interfere with the protective efficacy of the CSFV vaccine in clinical settings, and no effective treatment is available. In our previous study, we found that PRRSV infection could inhibit the replication of CSFV-C by promoting the high expression of inflammatory cytokines. In order to further investigate whether Chinese medicine could alleviate the inhibition effect, the PAM39 cells model, which was co-infected with PRRSV and CSFV-C, was established. The effects of Chinese medicine on this co-infection model, as well as the effect of astragalus polysaccharide on the TLRs/NF-κB/TNF-α pathways, were investigated. Our results demonstrated that PAM39 cells inoculated with different pathogenic PRRSV significantly inhibited the replication of CSFV-C and up-regulated the major inflammatory mediators, including TNF-α. For the following studies, 50 µM of astragalus polysaccharide was selected from six kinds of representative Chinese medicine based on their cytotoxicity, viral titers, and inflammatory mediators. Further experiments indicated that astragalus polysaccharide could alleviate the inhibition of CSFV-C replication in the co-infection group with no influence on cell viability. In addition, astragalus polysaccharide treatment clearly reduced P65 phosphorylation and down-regulated the expression of TLR7, TLR9, and TNF-α in co-infection group, implying that the TLRs/NF-κB/TNF-α pathways may play an important role in astragalus polysaccharide's anti-inflammatory response. In conclusion, astragalus polysaccharide treatment alleviated PRRSV-mediated inhibition of CSFV-C replication via the TLRs/NF-κB/TNF-α pathways, and the molecular mechanism of PRRSV co-infection leading to the failure of CSFV vaccine immunization was partially elucidated, providing a scientific basis for effective CSF prevention and control in pig farms.
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Affiliation(s)
- Dengjin Chen
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Haoran Kang
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Tianbei Tuo
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Lihong Wang
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Yidan Xia
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Yongning Zhang
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Lei Zhou
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Xinna Ge
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Jun Han
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
| | - Xin Guo
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China.
| | - Hanchun Yang
- Department of Preventive Veterinary Medicine, Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, 2 Yuanmingyuan West Road, Haidian District, Beijing 100193, People's Republic of China
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15
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Chen N, Wang Q, Hu Y, Sun Y, Li J, Wu H, Xu L, Liu H, Yang C, Chen X, Deng Y, Xia Y, Zhang Q, Cheng S, Fan A, Chen G. Comparative efficacy evaluation of different CSF vaccines in pigs with CSF maternally derived antibodies. Vet Microbiol 2022; 273:109541. [PMID: 36027683 DOI: 10.1016/j.vetmic.2022.109541] [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: 05/02/2022] [Revised: 08/01/2022] [Accepted: 08/07/2022] [Indexed: 11/18/2022]
Abstract
Classical swine fever (CSF) is a highly contagious and important swine disease in China. Sporadic outbreaks with mild clinical signs are still being reported despite massive vaccination with the CSF C-strain vaccine. One possible reason for vaccine failure could be interference from maternally derived antibodies (MDAs) during vaccination in the field. The aim of this study was to evaluate the efficacy of different CSF vaccines in the presence of MDAs and to assess the different vaccination schemes in the field. The results demonstrated that vaccination with a single dose of C-strain-PK vaccine protected pigs against severe clinical signs and significantly reduced viremia. The impact of MDAs was negligible. The interference was also mild during a prime and boost vaccination scheme using the C-strain-ST vaccine. In contrast, a significant influence of MDAs on the efficacy of the subunit E2 vaccine in a one-dose vaccination scheme was observed, with pigs showing severe clinical signs, CSF-associated death, typical pathological lesions and a high level of viremia after challenge, despite robust E2 antibody induction. A field vaccination and challenge study further confirmed the superior effectiveness of a single dose of C-strain-PK vaccine in the presence of MDAs in comparison to a routine prime and boost vaccination scheme applied in the field, with pigs having fever, chronic signs, significant viremia and shedding after challenge. Delaying the vaccination time from the age of 28 days to 45 days, when MDA was low, was beneficial for improving the clinical protection and immunity induced by vaccines. Altogether, the results presented here emphasize that a high-quality vaccine and a scientific design of the vaccination scheme based on serological surveillance are essential pillars to control and eliminate CSF in China.
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Affiliation(s)
- Ning Chen
- Boehringer Ingelheim Vetmedica (China) Co. Ltd., Taizhou 225300, People's Republic of China.
| | - Qin Wang
- World Organisation for Animal Health, Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Yulong Hu
- Boehringer Ingelheim Animal Health (Shanghai) Co. Ltd., Shanghai 200040, People's Republic of China
| | - Yanyong Sun
- Boehringer Ingelheim Vetmedica (China) Co. Ltd., Taizhou 225300, People's Republic of China
| | - Junping Li
- World Organisation for Animal Health, Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Huawei Wu
- World Organisation for Animal Health, Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Lu Xu
- World Organisation for Animal Health, Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Huanhuan Liu
- Boehringer Ingelheim Vetmedica (China) Co. Ltd., Taizhou 225300, People's Republic of China
| | - Chenghuai Yang
- World Organisation for Animal Health, Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Xiaochun Chen
- World Organisation for Animal Health, Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Yong Deng
- World Organisation for Animal Health, Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Yingju Xia
- World Organisation for Animal Health, Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Qianyi Zhang
- World Organisation for Animal Health, Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Shi Cheng
- Boehringer Ingelheim Animal Health (Shanghai) Co. Ltd., Shanghai 200040, People's Republic of China
| | - Aihua Fan
- Boehringer Ingelheim Animal Health (Shanghai) Co. Ltd., Shanghai 200040, People's Republic of China
| | - Guanghua Chen
- World Organisation for Animal Health, Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China.
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16
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Mi S, Wang L, Li H, Bao F, Madera R, Shi X, Zhang L, Mao Y, Yan R, Xia X, Gong W, Shi J, Tu C. Characterization of monoclonal antibodies that specifically differentiate field isolates from vaccine strains of classical swine fever virus. Front Immunol 2022; 13:930631. [PMID: 35958565 PMCID: PMC9361847 DOI: 10.3389/fimmu.2022.930631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Accepted: 06/27/2022] [Indexed: 11/13/2022] Open
Abstract
Classical swine fever virus (CSFV) is a major animal pathogen threatening the global pork industry. To date, numerous anti-CSFV monoclonal antibodies (mAbs) and their recognizing epitopes have been reported. However, few mAbs were systematically characterized for the capacity to differentiate field CSFV isolates from CSF vaccine strains, and the molecular basis associated with antigenic differences between vaccines and field isolates is still largely unknown. In the present study, recombinant CSFV structural glycoproteins E2 of both virulent and vaccine strains and Erns of vaccine strain were expressed using eukaryotic cells and murine mAbs generated against E2 and Erns. After serial screening and cloning of the hybridomas, the viral spectra of mAbs were respectively determined by indirect fluorescent antibody assay (IFA) using 108 CSFVs, followed by Western blot analysis using expressed glycoproteins of all CSFV sub-genotypes including vaccine strains. The antigenic structures recognized by these mAbs were characterized by epitope mapping using truncated, chimeric, and site-directed mutated E2 and Erns proteins. We have identified two vaccine-specific, one field isolate-specific, and two universal CSFV-specific mAbs and five novel conformational epitopes with critical amino acid (aa) motifs that are associated with these five mAbs: 213EPD215, 271RXGP274, and 37LXLNDG42 on E2 and 38CKGVP42, W81, and D100/V107 on Erns. Particularly, E213 of E2 is field isolate-specific, while N40 of E2 and D100/V107 of Erns are vaccine strain-specific. Results from our study further indicate that N40D of E2 mutation in field strains was likely produced under positive selection associated with long-term mass vaccination, leading to CSFV evasion of host immune response. Taking together, this study provides new insights into the antigenic structure of CSFV E2 and Erns and the differentiating mAbs will contribute to the development of a diagnostic strategy to differentiate C-strain vaccination from natural infection (DIVA) of CSFV in terms of elimination of CSF in China.
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Affiliation(s)
- Shijiang Mi
- State Key Laboratory for Zoonotic Diseases, Key Laboratory for Zoonoses Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Lihua Wang
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States
| | - Hongwei Li
- School of Biotechnology, Southern Medical University, Guangzhou, China
| | - Fei Bao
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Rachel Madera
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States
| | - Xiju Shi
- Institute of Animal Qurantine Reserach, Science and Technology Research Center of China Customs, Beijing, China
| | - Liying Zhang
- College of Animal Science and Technology, Jilin University, Changchun, China
| | - Yingying Mao
- School of Biotechnology, Southern Medical University, Guangzhou, China
| | - Renhe Yan
- Department of Research & Development, Guangzhou Bioneeds Biotechnology Co., Ltd, Guangzhou, China
| | - Xianzhu Xia
- State Key Laboratory for Zoonotic Diseases, Key Laboratory for Zoonoses Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
| | - Wenjie Gong
- State Key Laboratory for Zoonotic Diseases, Key Laboratory for Zoonoses Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
- *Correspondence: Changchun Tu, ; Jishu Shi, ; Wenjie Gong,
| | - Jishu Shi
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States
- *Correspondence: Changchun Tu, ; Jishu Shi, ; Wenjie Gong,
| | - Changchun Tu
- State Key Laboratory for Zoonotic Diseases, Key Laboratory for Zoonoses Research of the Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
- Changchun Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Changchun, China
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, China
- *Correspondence: Changchun Tu, ; Jishu Shi, ; Wenjie Gong,
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A Novel Competitive ELISA for Specifically Measuring and Differentiating Immune Responses to Classical Swine Fever C-Strain Vaccine in Pigs. Viruses 2022; 14:v14071544. [PMID: 35891524 PMCID: PMC9315997 DOI: 10.3390/v14071544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/07/2022] [Accepted: 07/13/2022] [Indexed: 11/17/2022] Open
Abstract
Classical swine fever can be controlled effectively by vaccination with C-strain vaccine. In this study, we developed a novel competitive enzyme-linked immunosorbent assay (cELISA) based on a C-strain Erns specific monoclonal antibody (mAb 1504), aiming to serologically measure immune responses to C-strain vaccine in pigs, and finally to make the C-strain become a DIVA-compatible vaccine. The cELISA system was established based on the strategy that mAb 1504 will compete with the C-strain induced antibodies in the pig serum to bind the C-strain Erns protein. The cELISA was optimized and was further evaluated by testing different categories of pig sera. It can efficiently differentiate C-strain immunized from wild-type CSFV-infected pigs and lacks cross-reaction with other common swine viruses and viruses in genus Pestivirus such as Bovine viral diarrhea virus (BVDV). The C-strain antibody can be tested in pigs 7-14 days post vaccination with this cELISA. The sensitivity and specificity of the established cELISA were 100% (95% confidence interval: 95.60 to 100%) and 100% (95% confidence interval: 98.30 to 100%), respectively. This novel cELISA is a reliable tool for specifically measuring and differentiating immune responses to C-strain vaccine in pigs. By combining with the wild-type CSFV-specific infection tests, it can make the C-strain have DIVA capability.
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Strong R, McCleary S, Grierson S, Choudhury B, Steinbach F, Crooke HR. Molecular Epidemiology Questions Transmission Pathways Identified During the Year 2000 Outbreak of Classical Swine Fever in the UK. Front Microbiol 2022; 13:909396. [PMID: 35836425 PMCID: PMC9274199 DOI: 10.3389/fmicb.2022.909396] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 05/06/2022] [Indexed: 11/18/2022] Open
Abstract
The last outbreak of classical swine fever (CSF) in the UK occurred in 2000. A total of 16 domestic pig holdings in the East Anglia region were confirmed as infected over a 3-month period. Obtaining viral genome sequences has since become easier and more cost-effective and has accordingly been applied to trace viral transmission events for a variety of viruses. The rate of genetic evolution varies for different viruses and is influenced by different transmission events, which will vary according to the epidemiology of an outbreak. To examine if genetic changes over the course of any future CSF outbreak would occur to supplement epidemiological investigations and help to track virus movements, the E2 gene and full genome of the virus present in archived tonsil samples from 14 of these infected premises were sequenced. Insufficient changes occurred in the full E2 gene to discriminate between the viruses from the different premises. In contrast, between 5 and 14 nucleotide changes were detected between the genome sequence of the virus from the presumed index case and the sequences from the other 13 infected premises. Phylogenetic analysis of these full CSFV genome sequences identified clusters of closely related viruses that allowed to corroborate some of the transmission pathways inferred by epidemiological investigations at the time. However, other sequences were more distinct and raised questions about the virus transmission routes previously implicated. We are thus confident that in future outbreaks, real-time monitoring of the outbreak via full genome sequencing will be beneficial.
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Phylodynamics of classical swine fever virus in Brazil. Braz J Microbiol 2022; 53:1065-1075. [PMID: 35394611 PMCID: PMC9151941 DOI: 10.1007/s42770-022-00724-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2021] [Accepted: 02/23/2022] [Indexed: 02/01/2023] Open
Abstract
The classical swine fever virus is the etiologic agent of one of the diseases with the greatest impact on swine farming worldwide. An extensive area of Brazil is considered free of the disease, but some states in Northeast Brazil have registered outbreaks since 2001. The objective of this study was to analyze the genetic variations of the virus and its spread over time and space. Partial sequences of the viral E2 protein obtained from samples collected during the Brazilian outbreaks were compared with sequences from the GenBank database (NCBI). The results demonstrated the continuous presence of the virus in the state of Ceará, with diffusion to at least two other states. The Brazilian Northeast virus presents specific polymorphisms that separate it from viruses isolated in other countries.
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Nguyen NH, Thi Phuong BN, Nguyen TQ, Do Tien D, Nguyen Thi MD, Nguyen MN. Genotypic diversity of CSFV field strains: A silent risk reduces vaccination efficacy of CSFV vaccines in Vietnam. Virology 2022; 571:39-45. [DOI: 10.1016/j.virol.2022.04.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 01/07/2022] [Accepted: 04/07/2022] [Indexed: 10/18/2022]
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Current Status of Genetically Modified Pigs That Are Resistant to Virus Infection. Viruses 2022; 14:v14020417. [PMID: 35216010 PMCID: PMC8874825 DOI: 10.3390/v14020417] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 02/05/2022] [Accepted: 02/08/2022] [Indexed: 02/02/2023] Open
Abstract
Pigs play an important role in agriculture and biomedicine. The globally developing swine industry must address the challenges presented by swine-origin viruses, including ASFV (African swine fever virus), PRRSV (porcine reproductive and respiratory syndrome virus), PEDV (porcine epidemic diarrhea virus), PRV (pseudorabies virus), CSFV (classical swine fever virus), TGEV (transmissible gastroenteritis virus), et al. Despite sustained efforts by many government authorities, these viruses are still widespread. Currently, gene-editing technology has been successfully used to generate antiviral pigs, which offers the possibility for increasing animal disease tolerance and improving animal economic traits in the future. Here, we summarized the current advance in knowledge regarding the host factors in virus infection and the current status of genetically modified pigs that are resistant to virus infection in the world. There has not been any report on PEDV-resistant pigs, ASFV-resistant pigs, and PRV-resistant pigs owing to the poor understanding of the key host factors in virus infection. Furthermore, we summarized the remaining problems in producing virus-resistant pigs, and proposed several potential methods to solve them. Using genome-wide CRISPR/Cas9 library screening to explore the key host receptors in virus infection may be a feasible method. At the same time, exploring the key amino acids of host factors in virus infection with library screening based on ABEs and CBEs (Bes) may provide creative insight into producing antiviral pigs in the future.
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ADAM17 Is an Essential Factor for the Infection of Bovine Cells with Pestiviruses. Viruses 2022; 14:v14020381. [PMID: 35215974 PMCID: PMC8875743 DOI: 10.3390/v14020381] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 02/04/2022] [Accepted: 02/07/2022] [Indexed: 01/19/2023] Open
Abstract
The entry of BVDV into bovine cells was studied using CRIB cells (cells resistant to infection with bovine viral diarrhea virus [BVDV]) that have evolved from MDBK cells by a spontaneous loss of susceptibility to BVDV. Recently, larger genetic deletions were reported but no correlation of the affected genes and the resistance to BVDV infection could be established. The metalloprotease ADAM17 was reported as an essential attachment factor for the related classical swine fever virus (CSFV). To assess whether ADAM17 might be involved in the resistance of CRIB-1 cells to pestiviruses, we analyzed its expression in CRIB-1 and MDBK cells. While ADAM17 protein was detectable in MBDK cells, it was absent from CRIB-1 cells. No functional full-length ADAM17 mRNA could be detected in CRIB cells and genetic analysis revealed the presence of two defective alleles. Transcomplementation of functional ADAM17 derived from MDBK cells in CRIB-1 cells resulted in a nearly complete reversion of their resistance to pestiviral infection. Our results demonstrate that ADAM17 is a key cellular factor for the pestivirus resistance of CRIB-1 cells and establishes its essential role for a broader range of pestiviruses.
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Zhao P, Wang C, Xia Y, Hu Y, Fang R, Zhao J. Seroprevalence Investigation of Classic Swine Fever Virus Before, During, and After African Swine Fever Virus Outbreak in Some Provinces of China from 2017 to 2021. Viral Immunol 2022; 35:33-40. [PMID: 35020503 DOI: 10.1089/vim.2021.0109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Classic swine fever is a severe infectious and fatal disease in pigs caused by the classic swine fever virus (CSFV). Surveillance and investigation for CSFV seroprevalence contribute to knowing the immune efficiency of CSFV vaccines and reflect health status of swine herd, especially since the African swine fever virus (ASFV) outbreak in China in 2018. A total of 40,489 pig serum samples with related descriptive variables were obtained from 12 provinces and 2 cities of China from December 2017 to May 2021, covering before, during, and after three periods of ASFV outbreak. Pearson chi-square test and multivariable logistic regression analysis were used to identify impact factors related to variations in CSFV seroprevalence. Total CSFV seroprevalence was 60.40% (95% confidence interval: 59.92-60.88). Seroprevalence and antibody blocking rate mean of CSFV before outbreak of ASFV in China are higher and change gently compared with that after outbreak of ASFV. Serum collected from "summer and autumn," "north, southwest and northwest of China," "pig farm located in hill or mountain," " period before outbreak of ASFV," "PRRSV negative farm," and "replacement gilts, multiparous sows and boars" show high seroprevalence of CSFV. These results show trends in prevalence of CSFV antibody in recent years in China, especially when ASFV entered China. Identified impact factors provide references for improving immune efficiency of CSFV vaccine and benefit for prevention of CSFV.
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Affiliation(s)
- Pengfei Zhao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Chaofei Wang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Yingjun Xia
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Yanli Hu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Rui Fang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Junlong Zhao
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
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Yao J, Su L, Wang Q, Gao L, Xie J, He Y, Shu X, Song C, Chai J, Zhang Y, Yang S. Epidemiological investigation and phylogenetic analysis of Classical Swine Fever virus in Yunnan province from 2015 to 2021. J Vet Sci 2022; 23:e57. [PMID: 35920121 PMCID: PMC9346530 DOI: 10.4142/jvs.22042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2022] [Revised: 05/06/2022] [Accepted: 05/13/2022] [Indexed: 11/20/2022] Open
Abstract
Background Classical swine fever virus (CSFV), the causative agent of classical swine fever (CFS), is a highly contagious disease that poses a serious threat to Chinese pig populations. Objectives Many provinces of China, such as Shandong, Henan, Hebei, Heilongjiang, and Liaoning provinces, have reported epidemics of CSFV, while the references to the epidemic of CSFV in Yunnan province are rare. This study examined the epidemic characteristics of the CSFV in Yunnan province. Methods In this study, 326 tissue samples were collected from different regions in Yunnan province from 2015 to 2021. A reverse transcription-polymerase chain reaction (RT-PCR), sequences analysis, and phylogenetic analysis were performed for the pathogenic detection and analysis of these 326 clinical specimens. Results Approximately 3.37% (11/326) of specimens tested positive for the CSFV by RT-PCR, which is lower than that of other regions of China. Sequence analysis of the partial E2 sequences of eleven CSFV strains showed that they shared 89.0–100.0% nucleotide (nt) and 95.0–100.0% amino acid (aa) homology, respectively. Phylogenetic analysis showed that these novel isolates belonged to the subgenotypes 2.1c and 2.1d, with subgenotype 2.1c being predominant. Conclusions The CSFV was sporadic in China’s Yunnan province from 2015 to 2021. Both 2.1c and 2.1d subgenotypes were found in this region, but 2.1c was dominant.
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Affiliation(s)
- Jun Yao
- Yunnan Tropical and Subtropical Animal Virus Diseases Laboratory, Yunnan Animal Science & Veterinary Institute, Kunming 650224, China
| | - Linlin Su
- College of Animal Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Qiaoping Wang
- College of Animal Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Lin Gao
- Yunnan Tropical and Subtropical Animal Virus Diseases Laboratory, Yunnan Animal Science & Veterinary Institute, Kunming 650224, China
| | - Jiarui Xie
- Yunnan Tropical and Subtropical Animal Virus Diseases Laboratory, Yunnan Animal Science & Veterinary Institute, Kunming 650224, China
| | - Yuwen He
- Yunnan Tropical and Subtropical Animal Virus Diseases Laboratory, Yunnan Animal Science & Veterinary Institute, Kunming 650224, China
| | - Xianghua Shu
- College of Animal Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Chunlian Song
- College of Animal Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Jun Chai
- College of Animal Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Yifang Zhang
- College of Animal Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Shibiao Yang
- Yunnan Tropical and Subtropical Animal Virus Diseases Laboratory, Yunnan Animal Science & Veterinary Institute, Kunming 650224, China
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Genetic diversity and molecular characterization of classical swine fever virus envelope protein genes E2 and E rns circulating in Vietnam from 2017 to 2019. INFECTION GENETICS AND EVOLUTION 2021; 96:105140. [PMID: 34781037 DOI: 10.1016/j.meegid.2021.105140] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2021] [Revised: 11/01/2021] [Accepted: 11/09/2021] [Indexed: 11/22/2022]
Abstract
Classical swine fever virus (CSFV) is an RNA virus that incurs severe economic costs to swine industries worldwide. This study was conducted to investigate the genetic diversity among CSFV strains circulating in Vietnam, with a focus on their genetic variants relative to four vaccine strains. Samples from clinical cases were collected from different provinces of Central and Southern Vietnam from 2017 to 2019. 21 CSFV-positive samples were selected for amplification and sequencing of the full-length Erns and E2 genes. Phylogenetic analyses of these two genes showed that most CSFV strains circulating in Central and Southern Vietnam from 2017 to 2019 belong to subgroup 2.1c, whereas the remaining strains cluster into subgroup 2.2. All CSFV field strains in this study were genetically distant from group 1 strains. Analysis of the E2 and Erns genes indicated that all CSFV field strains have low sequence identity with the vaccine strains (80-83.5% and 82.3-86% sequence identity for E2 and Erns, respectively). Likewise, amino acid-level sequence analysis showed 87.3-91.1% and 87.6-91.6% sequence identity for E2 and Erns, respectively. Together, our findings indicate that CSFV strains circulating in Vietnam belong to subtypes 2.2 and 2.1c, and we also provide novel insights into the epidemiology, molecular characteristics, genetic diversity, and evolution of these circulating CSFV strains.
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Huang YL, Meyer D, Postel A, Tsai KJ, Liu HM, Yang CH, Huang YC, Berkley N, Deng MC, Wang FI, Becher P, Crooke H, Chang CY. Identification of a Common Conformational Epitope on the Glycoprotein E2 of Classical Swine Fever Virus and Border Disease Virus. Viruses 2021; 13:v13081655. [PMID: 34452520 PMCID: PMC8402670 DOI: 10.3390/v13081655] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 08/17/2021] [Accepted: 08/18/2021] [Indexed: 12/13/2022] Open
Abstract
Classical swine fever virus (CSFV) shares high structural and antigenic homology with bovine viral diarrhea virus (BVDV) and border disease virus (BDV). Because all three viruses can infect swine and elicit cross-reactive antibodies, it is necessary to differentiate among them with regard to serological diagnosis of classical swine fever. To understand the mechanism of cross-reactivity, it is important to define common or specific epitopes of these viruses. For this purpose, epitope mapping of six monoclonal antibodies (mAbs) was performed using recombinant expressed antigenic domains of CSFV and BDV E2 proteins. One CSFV-specific conformational epitope and one CSFV and BDV common epitope within domain B/C of E2 were identified. Site-directed mutagenesis confirmed that residues G725 and V738/I738 of the CSFV-specific epitope and P709/L709 and E713 of the second epitope are important for mAbs binding. Infection of CSFV in porcine cells was significantly reduced after pre-incubation of the cells with the domain B/C of E2 or after pre-incubation of CSFV with the mAbs detecting domain B/C. 3D structural modeling suggested that both epitopes are exposed on the surface of E2. Based on this, the identified epitopes represent a potential target for virus neutralization and might be involved in the early steps of CSFV infection.
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Affiliation(s)
- Yu-Liang Huang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Denise Meyer
- EU and OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; (D.M.); (A.P.); (P.B.)
| | - Alexander Postel
- EU and OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; (D.M.); (A.P.); (P.B.)
| | - Kuo-Jung Tsai
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Hsin-Meng Liu
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Chia-Huei Yang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Yu-Chun Huang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Nicholas Berkley
- OIE Reference Laboratory for Classical Swine Fever, Animal and Plant Health Agency, New Haw KT15 3NB, Surrey, UK;
| | - Ming-Chung Deng
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
| | - Fun-In Wang
- School of Veterinary Medicine, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan;
| | - Paul Becher
- EU and OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine Hannover, 30559 Hannover, Germany; (D.M.); (A.P.); (P.B.)
| | - Helen Crooke
- OIE Reference Laboratory for Classical Swine Fever, Animal and Plant Health Agency, New Haw KT15 3NB, Surrey, UK;
- Correspondence: (H.C.); (C.-Y.C.); Tel.: +44-0-1932-357331 (H.C.); +886-2-2621-2111 (ext. 343) (C.-Y.C.)
| | - Chia-Yi Chang
- OIE Reference Laboratory for Classical Swine Fever, Animal Health Research Institute, Council of Agriculture, Executive Yuan, 376 Chung-Cheng Road, Tansui, New Taipei City 25158, Taiwan; (Y.-L.H.); (K.-J.T.); (H.-M.L.); (C.-H.Y.); (Y.-C.H.); (M.-C.D.)
- Correspondence: (H.C.); (C.-Y.C.); Tel.: +44-0-1932-357331 (H.C.); +886-2-2621-2111 (ext. 343) (C.-Y.C.)
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Clemmons EA, Alfson KJ, Dutton JW. Transboundary Animal Diseases, an Overview of 17 Diseases with Potential for Global Spread and Serious Consequences. Animals (Basel) 2021; 11:2039. [PMID: 34359167 PMCID: PMC8300273 DOI: 10.3390/ani11072039] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/24/2021] [Accepted: 06/25/2021] [Indexed: 12/21/2022] Open
Abstract
Animals provide food and other critical resources to most of the global population. As such, diseases of animals can cause dire consequences, especially disease with high rates of morbidity or mortality. Transboundary animal diseases (TADs) are highly contagious or transmissible, epidemic diseases, with the potential to spread rapidly across the globe and the potential to cause substantial socioeconomic and public health consequences. Transboundary animal diseases can threaten the global food supply, reduce the availability of non-food animal products, or cause the loss of human productivity or life. Further, TADs result in socioeconomic consequences from costs of control or preventative measures, and from trade restrictions. A greater understanding of the transmission, spread, and pathogenesis of these diseases is required. Further work is also needed to improve the efficacy and cost of both diagnostics and vaccines. This review aims to give a broad overview of 17 TADs, providing researchers and veterinarians with a current, succinct resource of salient details regarding these significant diseases. For each disease, we provide a synopsis of the disease and its status, species and geographic areas affected, a summary of in vitro or in vivo research models, and when available, information regarding prevention or treatment.
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Affiliation(s)
- Elizabeth A. Clemmons
- Southwest National Primate Research Center, Texas Biomedical Research Institute, 8715 W. Military Drive, San Antonio, TX 78227, USA;
| | - Kendra J. Alfson
- Texas Biomedical Research Institute, 8715 W. Military Drive, San Antonio, TX 78227, USA
| | - John W. Dutton
- Southwest National Primate Research Center, Texas Biomedical Research Institute, 8715 W. Military Drive, San Antonio, TX 78227, USA;
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Zhu X, Liu M, Wu X, Ma W, Zhao X. Phylogenetic analysis of classical swine fever virus isolates from China. Arch Virol 2021; 166:2255-2261. [PMID: 34003359 DOI: 10.1007/s00705-021-05084-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Accepted: 03/18/2021] [Indexed: 11/26/2022]
Abstract
Classical swine fever (CSF), caused by classical swine fever virus (CSFV), is a severe disease that causes huge economic losses in the swine industry worldwide. In China, CSF has been under control due to extensive vaccination since 1954. However, there are still sporadic CSF outbreaks in China. Here, we isolated 27 CSFV strains from three Chinese provinces (Shaanxi, Gansu, and Ningxia) from 2011 to 2018. Phylogenetic analysis based on the full-length envelope glycoprotein E2 coding region revealed that 25 out of 27 CSFV isolates clustered within subgroups 2.1 and 2.2, while two strains from Gansu belonged to subgroup 1.1. The sequence identity among these 27 isolates varied from 79.3% to 99.8% (nucleotides) and from 83.1% to 99.7% (amino acids). Further analysis based on the E2 amino acid sequences showed that these new isolates have consistent amino acid substitutions, including R31K and N34S.
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Affiliation(s)
- Xiaofu Zhu
- Key Laboratory of Animal Epidemic Disease Diagnostic Laboratory of Molecular Biology in Xianyang City, Xianyang Vocational Technical College, Xianyang, 712000, Shaanxi, China.
| | - Mingjie Liu
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Xujin Wu
- Key Laboratory of Animal Epidemic Disease Diagnostic Laboratory of Molecular Biology in Xianyang City, Xianyang Vocational Technical College, Xianyang, 712000, Shaanxi, China
| | - Wentao Ma
- College of Veterinary Medicine, Northwest A&F University, Yangling, 712100, Shaanxi, China
| | - Xuanduo Zhao
- Yangling Bodeyue Biotechnology Co., Ltd., Yangling, 712100, Shaanxi, China
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Sawai K, Nishi T, Fukai K, Kato T, Hayama Y, Yamamoto T. Phylogenetic and phylodynamic analysis of a classical swine fever virus outbreak in Japan (2018-2020). Transbound Emerg Dis 2021; 69:1529-1538. [PMID: 33890426 DOI: 10.1111/tbed.14117] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 04/12/2021] [Accepted: 04/16/2021] [Indexed: 12/24/2022]
Abstract
After 26 years, another classical swine fever virus (CSFV) outbreak in domestic pigs and wild boars occurred in Japan 2018. Herein, we investigated the entry and the spatial dynamics of the CSFV outbreak in Japan using the nearly complete genomes of strains isolated from both wild boars and domestic pigs during this epidemic. Phylogenetic analysis showed that the most recent common ancestor (MRCA) of the Japanese lineage emerged 146 days (95% highest posterior density (HPD): 85-216 days) before the index case was detected. Based on epidemiological analysis, the period for the 95% HPD was 1 month earlier than the time of virus introduction into the index farm. The disease mainly spreads to the adjoining regions during the epidemic, with no spread to the nonadjacent regions. This result indicates that human activities, such as the movement of vehicles, contributed to the infection spread. As cases occurred in nonadjacent regions, the MRCA for the epidemic in the Saitama prefecture was estimated to have emerged 93 days before the date of detection in the initial farm in this region. Similarly, the MRCA for the epidemic in Okinawa prefecture, more than 1,300 km away from the other infected regions, was estimated to have emerged 34 days before the date of detection in the region's primary farm. Therefore, our results indicate that if exotic diseases emerge after a long period of absence or in a disease-free country, a longer period of time will elapse before detection, resulting in further spread. Additionally, subsequent infections occurring in regions distant from the original infected region will require less time for detection than in the original region. This study provides valuable insights into a CSFV outbreak that occurred in a previously CSFV-free country and thus beneficial in enhancing producers' awareness and allow for better preparation for infections.
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Affiliation(s)
- Kotaro Sawai
- Epidemiology Unit, Viral Disease and Epidemiology Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Japan
| | - Tatsuya Nishi
- Exotic Disease Research Station, Division of Transboundary Animal Diseases, National Institute of Animal Health, National Agriculture and Food Research Organization, Kodaira, Japan
| | - Katsuhiko Fukai
- Exotic Disease Research Station, Division of Transboundary Animal Diseases, National Institute of Animal Health, National Agriculture and Food Research Organization, Kodaira, Japan
| | - Tomoko Kato
- Exotic Disease Research Station, Division of Transboundary Animal Diseases, National Institute of Animal Health, National Agriculture and Food Research Organization, Kodaira, Japan
| | - Yoko Hayama
- Epidemiology Unit, Viral Disease and Epidemiology Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Japan
| | - Takehisa Yamamoto
- Epidemiology Unit, Viral Disease and Epidemiology Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, Tsukuba, Japan
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Sudo K, Yamada M, Ochiai M, Iwamoto S, Sakaki H, Kushida C, Yamashita M, Yamamoto A, Nagasaka T, Oidemizu M, Saito A, Yamamoto K. The formation process of button ulcers in pigs experimentally infected with a subgenotype 2.1 isolate of classical swine fever virus. J Vet Med Sci 2021; 83:990-993. [PMID: 33867396 PMCID: PMC8267204 DOI: 10.1292/jvms.20-0654] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
We evaluated the role of classical swine fever virus (CSFV) in the formation of button ulcers in the mucosa of the gastrointestinal tract. Histopathological and immunohistochemical analyses of pigs experimentally infected with a subgenotype 2.1 isolate of CSFV, which was isolated in Japan in 2019, revealed follicular necrosis in the submucosal mucosa-associated lymphoid tissue and herniation of crypts as factors that contribute to the development of button ulcers during CSFV infection. These findings indicate that CSFV induces follicular necrosis and is one of the causative agents of button ulcers in pigs.
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Affiliation(s)
- Kasumi Sudo
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan.,Present address: Food and Agriculture Organization of the United Nations, Viale delle Terme di Caracalla, 00153 Rome, Italy
| | - Manabu Yamada
- National Institute of Animal Health, National Agriculture and Food Research Organization, 3-1-5 Kannodai, Tsukuba, Ibaraki 305-0856, Japan
| | - Mariko Ochiai
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
| | - Shoko Iwamoto
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
| | - Hajime Sakaki
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
| | - Chiho Kushida
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
| | - Maiko Yamashita
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
| | - Atsushi Yamamoto
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
| | - Takao Nagasaka
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
| | - Mikio Oidemizu
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
| | - Akito Saito
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
| | - Kinya Yamamoto
- National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
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31
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Fan J, Liao Y, Zhang M, Liu C, Li Z, Li Y, Li X, Wu K, Yi L, Ding H, Zhao M, Fan S, Chen J. Anti-Classical Swine Fever Virus Strategies. Microorganisms 2021; 9:microorganisms9040761. [PMID: 33917361 PMCID: PMC8067343 DOI: 10.3390/microorganisms9040761] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 03/24/2021] [Accepted: 04/02/2021] [Indexed: 12/23/2022] Open
Abstract
Classical swine fever (CSF), caused by CSF virus (CSFV), is a highly contagious swine disease with high morbidity and mortality, which has caused significant economic losses to the pig industry worldwide. Biosecurity measures and vaccination are the main methods for prevention and control of CSF since no specific drug is available for the effective treatment of CSF. Although a series of biosecurity and vaccination strategies have been developed to curb the outbreak events, it is still difficult to eliminate CSF in CSF-endemic and re-emerging areas. Thus, in addition to implementing enhanced biosecurity measures and exploring more effective CSF vaccines, other strategies are also needed for effectively controlling CSF. Currently, more and more research about anti-CSFV strategies was carried out by scientists, because of the great prospects and value of anti-CSFV strategies in the prevention and control of CSF. Additionally, studies on anti-CSFV strategies could be used as a reference for other viruses in the Flaviviridae family, such as hepatitis C virus, dengue virus, and Zika virus. In this review, we aim to summarize the research on anti-CSFV strategies. In detail, host proteins affecting CSFV replication, drug candidates with anti-CSFV effects, and RNA interference (RNAi) targeting CSFV viral genes were mentioned and the possible mechanisms related to anti-CSFV effects were also summarized.
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Affiliation(s)
- Jindai Fan
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Yingxin Liao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Mengru Zhang
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Chenchen Liu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Zhaoyao Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Yuwan Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Xiaowen Li
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Keke Wu
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Lin Yi
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Hongxing Ding
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Mingqiu Zhao
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
| | - Shuangqi Fan
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
- Correspondence: (S.F.); (J.C.); Tel.: +86-20-8528-8017 (J.C.)
| | - Jinding Chen
- College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China; (J.F.); (Y.L.); (M.Z.); (C.L.); (Z.L.); (Y.L.); (X.L.); (K.W.); (L.Y.); (H.D.); (M.Z.)
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Veterinary Medicine, South China Agricultural University, Guangzhou 510642, China
- Key Laboratory of Zoonosis Prevention and Control of Guangdong Province, Guangzhou 510642, China
- Correspondence: (S.F.); (J.C.); Tel.: +86-20-8528-8017 (J.C.)
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Yamamoto T, Sawai K, Nishi T, Fukai K, Kato T, Hayama Y, Murato Y, Shimizu Y, Yamaguchi E. Subgrouping and analysis of relationships between classical swine fever virus identified during the 2018-2020 epidemic in Japan by a novel approach using shared genomic variants. Transbound Emerg Dis 2021; 69:1166-1177. [PMID: 33730417 DOI: 10.1111/tbed.14076] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 03/01/2021] [Accepted: 03/15/2021] [Indexed: 11/29/2022]
Abstract
Classical swine fever (CSF) is a worldwide devastating disease of the pig industry caused by classical swine fever virus (CSFV). In September 2018, an outbreak of CSF occurred in Japan where the disease had been eradicated and was officially designated a CSF-free country since 2015. Following the detection of the first 2018 case on a farm in Gifu Prefecture, the disease spread among both farm pigs and wild boars and still continues. Epigenome analysis using whole-genome information is helpful in identifying the infection route, but the current approaches provide an insufficient resolution. In this study, a novel method of using single-nucleotide variants (SNVs) was employed to identify the associations among 158 isolates (65 from farms and 93 from wild boars). The identified groups of CSFV strains were plotted in different colours on a map, identifying the location where each strain was collected. The lack of an SNV set shared between the index case and the other strains suggested the first infection in Japan during the outbreak occurred in wild boars, not at the index farm. For the Atsumi Peninsula outbreaks, where nine farms were found infected within a 10-km radius area, the farm strains were assembled into three groups, suggesting these outbreaks resulted from at least three different infection events in this area. For the infections in the area around Saitama Prefecture, an area remote from the epicentre, strains from both the farms and wild boars were identified as being in the same group, suggesting they resulted from one viral introduction. Likewise, seven infected farms in Okinawa Prefecture, almost 1,500 km from Gifu Prefecture, were identified as being in a common, but separate group. By demonstrating the variety of transmission routes and possibility of long-distance infection, these results will help improve disease control measures.
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Affiliation(s)
- Takehisa Yamamoto
- Epidemiology Unit, Viral Disease and Epidemiology Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, Ibaraki, Japan
| | - Kotaro Sawai
- Epidemiology Unit, Viral Disease and Epidemiology Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, Ibaraki, Japan
| | - Tatsuya Nishi
- Foot and Mouth Disease Unit, Division of Transboundary Animal Diseases, National Institute of Animal Health, National Agriculture and Food Research Organization, Kodaira, Japan
| | - Katsuhiko Fukai
- Foot and Mouth Disease Unit, Division of Transboundary Animal Diseases, National Institute of Animal Health, National Agriculture and Food Research Organization, Kodaira, Japan
| | - Tomoko Kato
- Foot and Mouth Disease Unit, Division of Transboundary Animal Diseases, National Institute of Animal Health, National Agriculture and Food Research Organization, Kodaira, Japan
| | - Yoko Hayama
- Epidemiology Unit, Viral Disease and Epidemiology Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, Ibaraki, Japan
| | - Yoshinori Murato
- Epidemiology Unit, Viral Disease and Epidemiology Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, Ibaraki, Japan
| | - Yumiko Shimizu
- Epidemiology Unit, Viral Disease and Epidemiology Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, Ibaraki, Japan
| | - Emi Yamaguchi
- Epidemiology Unit, Viral Disease and Epidemiology Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, Ibaraki, Japan
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Yuan F, Li D, Li C, Zhang Y, Song H, Li S, Deng H, Gao GF, Zheng A. ADAM17 is an essential attachment factor for classical swine fever virus. PLoS Pathog 2021; 17:e1009393. [PMID: 33684175 PMCID: PMC7971878 DOI: 10.1371/journal.ppat.1009393] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 03/18/2021] [Accepted: 02/15/2021] [Indexed: 01/02/2023] Open
Abstract
Classical swine fever virus (CSFV) is an important pathogen in the swine industry. Virion attachment is mediated by envelope proteins Erns and E2, and E2 is indispensable. Using a pull-down assay with soluble E2 as the bait, we demonstrated that ADAM17, a disintegrin and metalloproteinase 17, is essential for CSFV entry. Loss of ADAM17 in a permissive cell line eliminated E2 binding and viral entry, but compensation with pig ADAM17 cDNA completely rescued these phenotypes. Similarly, ADAM17 silencing in primary porcine fibroblasts significantly impaired virus infection. In addition, human and mouse ADAM17, which is highly homologous to pig ADAM17, also mediated CSFV entry. The metalloproteinase domain of ADAM17 bound directly to E2 protein in a zinc-dependent manner. A surface exposed region within this domain was mapped and shown to be critical for CSFV entry. These findings clearly demonstrate that ADAM17 serves as an essential attachment factor for CSFV.
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Affiliation(s)
- Fei Yuan
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
| | - Dandan Li
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Changyao Li
- College of Veterinary Medicine, China Agricultural University, Beijing, China
| | - Yanan Zhang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Hao Song
- Research Network of Immunity and Health (RNIH), Beijing Institutes of Life Science, Chinese Academy of Sciences, Beijing, China
| | - Suhua Li
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
| | - Hongkui Deng
- Peking University Stem Cell Research Center, Department of Cell Biology, School of Basic Medical Sciences, Peking University Health Science Center, Beijing, China
- * E-mail: (HD); (GFG); (AZ)
| | - George F. Gao
- CAS Key Laboratory of Pathogenic Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
- * E-mail: (HD); (GFG); (AZ)
| | - Aihua Zheng
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, School of Tropical Medicine and Laboratory Medicine, Hainan Medical University, Haikou, China
- College of Life Science, Henan Normal University, Xinxiang, China
- * E-mail: (HD); (GFG); (AZ)
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The ESCRT-I Subunit Tsg101 Plays Novel Dual Roles in Entry and Replication of Classical Swine Fever Virus. J Virol 2021; 95:JVI.01928-20. [PMID: 33328308 DOI: 10.1128/jvi.01928-20] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 12/08/2020] [Indexed: 12/27/2022] Open
Abstract
Classical swine fever (CSF), caused by classical swine fever virus (CSFV), is a highly contagious disease of swine with high morbidity and mortality that negatively affects the pig industry worldwide, in particular in China. Soon after the endocytosis of CSFV, the virus makes full use of the components of host cells to complete its life cycle. The endocytosis sorting complex required for transport (ESCRT) system is a central molecular machine for membrane protein sorting and scission in eukaryotic cells that plays an essential role in many physiological metabolic processes, including invasion and egress of envelope viruses. However, the molecular mechanism that ESCRT uses to regulate the replication of CSFV is unknown. In this study, we demonstrated that the ESCRT-I complex Tsg101 protein participates in clathrin-mediated endocytosis of CSFV and is also involved in CSFV trafficking. Tsg101 assists the virus in entering the host cell through the late endosome (Rab7 and Rab9) and finally reaching the lysosome (Lamp-1). Interestingly, Tsg101 is also involved in the viral replication process by interacting with nonstructural proteins 4B and 5B of CSFV. Finally, confocal microscopy showed that the replication complex of Tsg101 and double-stranded RNA (dsRNA) or NS4B and NS5B protein was close to the endoplasmic reticulum (ER), not the Golgi, in the cytoplasm. Collectively, our finding highlights that Tsg101 regulates the process of CSFV entry and replication, indicating that the ESCRT plays an important role in the life cycle of CSFV. Thus, ESCRT molecules could serve as therapeutic targets to combat CSFV infection.IMPORTANCE CSF, caused by CSFV, is a World Organization for Animal Health (OIE) notifiable disease and causes significant financial losses to the pig industry globally. The ESCRT machinery plays an important regulatory role in several members of the genera Flavivirus and Hepacivirus within the family Flaviviridae, such as hepatitis C virus, Japanese encephalitis virus, and dengue virus. Previous reports have shown that assembling and budding of these viruses require ESCRT. However, the role of ESCRT in Pestivirus infection remains to be elucidated. We determined the molecular mechanisms of the regulation of CSFV infection by the major subunit Tsg101 of ESCRT-I. Interestingly, Tsg101 plays an essential regulatory role in both clathrin-mediated endocytosis and genome replication of CSFV. Overall, the results of this study provide further insights into the molecular function of ESCRT-I complex protein Tsg101 during CSFV infection, which may serve as a molecular target for pestivirus inhibitors.
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Wang Q, Liu H, Xu L, Li J, Wu H, Yang C, Chen X, Deng Y, Sun Y, Tu C, Chen N, Gong W, Chen G. Different clinical presentations of subgenotype 2.1 strain of classical swine fever infection in weaned piglets and adults, and long-term cross-protection conferred by a C-strain vaccine. Vet Microbiol 2020; 253:108915. [PMID: 33309157 DOI: 10.1016/j.vetmic.2020.108915] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 10/28/2020] [Indexed: 12/17/2022]
Abstract
Classical swine fever is an important swine disease in China, and sporadic outbreaks with mild clinical signs despite compulsory vaccination have raised questions about the virulence and pathogenicity of prevalent subgenotype 2.1 strains, and the ability of C-strain vaccines to cross-protect against them. To investigate this, three field isolates were evaluated in experimentally infected piglets and compared with the highly virulent reference Shimen strain. Clinical signs for the field strains ranged from mild to severe, and mortality ranged from 0 to 80 %. These data show differences in virulence among the subgenotype 2.1 field isolates and support the use of field strain GD191 as a genotype 2 challenge virus to assess efficacy of C-strain vaccines. In contrast to the historical genotype 1 strain, which caused acute infection with significant virus shedding in non-vaccinated animals, the subgenotype 2.1 GD191 strain produced different clinical manifestations in weaned piglets and adults. Adult pigs showed subclinical infection with viral shedding, whereas weaned piglets showed overt signs of infection. Efficacy of, and duration of immunity conferred by a C-strain vaccine were assessed using the reference Shimen strain and field isolate GD191 at 12 and 15 months after vaccination. A robust antibody response and sterilising protection were seen in all vaccinated animals and lasted up to 15 months post-vaccination. This study confirms that C-strain vaccines confer both clinical and virological protection against the historical genotype 1 Shimen strain and cross-protection against the prevalent genotype 2 field strain.
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Affiliation(s)
- Qin Wang
- Office International des Epizooties/National Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Huanhuan Liu
- Boehringer Ingelheim Vetmedica (China) Co. Ltd., Taizhou 225300, People's Republic of China
| | - Lu Xu
- Office International des Epizooties/National Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Junping Li
- Office International des Epizooties/National Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Huawei Wu
- Office International des Epizooties/National Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Chenghuai Yang
- Office International des Epizooties/National Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Xiaochun Chen
- Office International des Epizooties/National Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Yong Deng
- Office International des Epizooties/National Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China
| | - Yanyong Sun
- Boehringer Ingelheim Vetmedica (China) Co. Ltd., Taizhou 225300, People's Republic of China
| | - Changchun Tu
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun 130122, People's Republic of China
| | - Ning Chen
- Boehringer Ingelheim Vetmedica (China) Co. Ltd., Taizhou 225300, People's Republic of China.
| | - Wenjie Gong
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun 130122, People's Republic of China; Key Laboratory of Zoonoses Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun 130062, People's Republic of China.
| | - Guanghua Chen
- Office International des Epizooties/National Reference Laboratory for Classical Swine Fever, China Institute of Veterinary Drug Control, Beijing 100081, People's Republic of China.
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Hao G, Zhang H, Chen H, Qian P, Li X. Comparison of the Pathogenicity of Classical Swine Fever Virus Subgenotype 2.1c and 2.1d Strains from China. Pathogens 2020; 9:pathogens9100821. [PMID: 33036431 PMCID: PMC7600237 DOI: 10.3390/pathogens9100821] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 09/29/2020] [Accepted: 09/30/2020] [Indexed: 12/16/2022] Open
Abstract
Classical swine fever (CSF) caused by classical swine fever virus (CSFV) is a highly contagious and devastating disease. The traditional live attenuated C-strain vaccine is widely used to control disease outbreaks in China. Since 2000, subgenotype 2.1 has become dominant in China. Here, we isolated subgenotype 2.1c and 2.1d strains from CSF-suspected pigs. The genetic variations and pathogenesis of subgenotype 2.1c and 2.1d strains were investigated experimentally. We aimed to evaluate and compare the replication characteristics and clinical signs of subgenotype 2.1c and 2.1d strains with those of the typical highly virulent CSFV SM strain. In PK-15 cells, the three CSFV isolates exhibited similar replication levels but significantly lower replication levels compared with the CSFV SM strain. The experimental animal infection model showed that the pathogenicity of subgenotype 2.1c and 2.1d strains was less than that of the CSFV SM strain. According to the clinical scoring system, subgenotype 2.1c (GDGZ-2019) and 2.1d (HBXY-2019 and GXGG-2019) strains were moderately virulent. This study showed that the pathogenicity of CSFV field strains will aid in the understanding of CSFV biological characteristics and the related epidemiology.
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Affiliation(s)
- Genxi Hao
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; (G.H.); (H.Z.); (H.C.)
- Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Huawei Zhang
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; (G.H.); (H.Z.); (H.C.)
- Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
| | - Huanchun Chen
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; (G.H.); (H.Z.); (H.C.)
- Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan 430070, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China
| | - Ping Qian
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; (G.H.); (H.Z.); (H.C.)
- Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan 430070, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China
- Correspondence: (P.Q.); (X.L.); Tel.: +86-27-87282608 (P.Q.)
| | - Xiangmin Li
- State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan 430070, China; (G.H.); (H.Z.); (H.C.)
- Laboratory of Animal Virology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan 430070, China
- Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Wuhan 430070, China
- Correspondence: (P.Q.); (X.L.); Tel.: +86-27-87282608 (P.Q.)
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Tu F, Yang X, Xu S, Chen D, Zhou L, Ge X, Han J, Zhang Y, Guo X, Yang H. Development of a fluorescent probe-based real-time reverse transcription recombinase-aided amplification assay for the rapid detection of classical swine fever virus. Transbound Emerg Dis 2020; 68:2017-2027. [PMID: 32979245 DOI: 10.1111/tbed.13849] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 09/05/2020] [Accepted: 09/17/2020] [Indexed: 11/29/2022]
Abstract
Classical swine fever (CSF), which is caused by the CSF virus (CSFV), remains one of the most economically important diseases of the global swine industry. Rapid and reliable detection of CSFV is critical for controlling CSF. In this study, a novel fluorescent probe-based real-time reverse transcription recombinase-aided amplification (rRT-RAA) assay, targeting a highly conserved position within the 5' non-translated region (5'NTR) among all CSFV genotypes, was developed for the detection of CSFV. The assay is highly specific to CSFV and does not cross react with other important viruses. Sensitivity analysis revealed that the assay could detect two 50% tissue culture infectious dose (TCID50 ) of CSFV RNA per reaction at 95% probability, which is comparable to that of a documentary reverse transcription quantitative PCR (RT-qPCR) assay for CSFV. The rRT-RAA assay exhibited good reproducibility, with intra- and inter-assay coefficient of variation values of <8.0%. Of the 135 samples (including 102 clinical tissue samples and 33 different cell culture isolates of CSFV), 50 and 52 samples were tested positive for CSFV by rRT-RAA and RT-qPCR, respectively. The coincidence rate between the two assays was 98.5% (133/135). Further linear regression analysis showed a significant correlation between the rRT-RAA and RT-qPCR assays with an R2 value of 0.8682. Interestingly, the amplification products of the rRT-RAA assay could be directly observed with naked eyes under a portable blue light imager, making it possible for an on-site testing. Our results indicate that the rRT-RAA assay is a robust diagnostic tool for the rapid detection of CSFV.
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Affiliation(s)
- Fei Tu
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China
| | - Xintan Yang
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China
| | - Shengkui Xu
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China
| | - Dengjin Chen
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China
| | - Lei Zhou
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China
| | - Xinna Ge
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China
| | - Jun Han
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China
| | - Yongning Zhang
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China
| | - Xin Guo
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China
| | - Hanchun Yang
- Key Laboratory of Animal Epidemiology of Ministry of Agriculture and Rural Affairs, College of Veterinary Medicine, China Agricultural University, Beijing, People's Republic of China
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Analysis of Virus Population Profiles within Pigs Infected with Virulent Classical Swine Fever Viruses: Evidence for Bottlenecks in Transmission but Absence of Tissue-Specific Virus Variants. J Virol 2020; 94:JVI.01119-20. [PMID: 32699086 DOI: 10.1128/jvi.01119-20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 07/14/2020] [Indexed: 11/20/2022] Open
Abstract
Classical swine fever virus (CSFV) contains a specific motif within the E2 glycoprotein that differs between strains of different virulence. In the highly virulent CSFV strain Koslov, this motif comprises residues S763/L764 in the polyprotein. However, L763/P764 represent the predominant alleles in published CSFV genomes. In this study, changes were introduced into the CSFV strain Koslov (here called vKos_SL) to generate modified CSFVs with substitutions at residues 763 and/or 764 (vKos_LL, vKos_SP, and vKos_LP). The properties of these mutant viruses, in comparison to those of vKos_SL, were determined in pigs. Each of the viruses was virulent and induced typical clinical signs of CSF, but the vKos_LP strain produced them significantly earlier. Full-length CSFV cDNA amplicons (12.3 kb) derived from sera of infected pigs were deep sequenced and cloned to reveal the individual haplotypes that contributed to the single-nucleotide polymorphism (SNP) profiles observed in the virus population. The SNP profiles for vKos_SL and vKos_LL displayed low-level heterogeneity across the entire genome, whereas vKos_SP and vKos_LP displayed limited diversity with a few high-frequency SNPs. This indicated that vKos_SL and vKos_LL exhibited a higher level of fitness in the host and more stability at the consensus level, whereas several consensus changes were observed in the vKos_SP and vKos_LP sequences, pointing to adaptation. For each virus, only a subset of the variants present within the virus inoculums were maintained in the infected pigs. No clear tissue-dependent quasispecies differentiation occurred within inoculated pigs; however, clear evidence for transmission bottlenecks to contact animals was observed, with subsequent loss of sequence diversity.IMPORTANCE The surface-exposed E2 protein of classical swine fever virus is required for its interaction with host cells. A short motif within this protein varies between strains of different virulence. The importance of two particular amino acid residues in determining the properties of a highly virulent strain of the virus has been analyzed. Each of the different viruses tested proved highly virulent, but one of them produced earlier, but not more severe, disease. By analyzing the virus genomes present within infected pigs, it was found that the viruses which replicated within inoculated animals were only a subset of those within the virus inoculum. Furthermore, following contact transmission, it was shown that a very restricted set of viruses had transferred between animals. There were no significant differences in the virus populations present in various tissues of the infected animals. These results indicate mechanisms of virus population change during transmission between animals.
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Ganges L, Crooke HR, Bohórquez JA, Postel A, Sakoda Y, Becher P, Ruggli N. Classical swine fever virus: the past, present and future. Virus Res 2020; 289:198151. [PMID: 32898613 DOI: 10.1016/j.virusres.2020.198151] [Citation(s) in RCA: 86] [Impact Index Per Article: 21.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 08/24/2020] [Accepted: 08/28/2020] [Indexed: 12/22/2022]
Abstract
Classical swine fever (CSF) is among the most relevant viral epizootic diseases of swine. Due to its severe economic impact, CSF is notifiable to the world organisation for animal health. Strict control policies, including systematic stamping out of infected herds with and without vaccination, have permitted regional virus eradication. Nevertheless, CSF virus (CSFV) persists in certain areas of the world and has re-emerged regularly. This review summarizes the basic established knowledge in the field and provides a comprehensive and updated overview of the recent advances in fundamental CSFV research, diagnostics and vaccine development. It covers the latest discoveries on the genetic diversity of pestiviruses, with implications for taxonomy, the progress in understanding disease pathogenesis, immunity against acute and persistent infections, and the recent findings in virus-host interactions and virulence determinants. We also review the progress and pitfalls in the improvement of diagnostic tools and the challenges in the development of modern and efficacious marker vaccines compatible with serological tests for disease surveillance. Finally, we highlight the gaps that require research efforts in the future.
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Affiliation(s)
- Llilianne Ganges
- OIE Reference Laboratory for Classical Swine Fever, Institute of Agrifood Research and Technology, Centre de Recerca en Sanitat Animal (CReSA), 08193 Barcelona, Spain.
| | - Helen R Crooke
- Virology Department, Animal and Plant Health Agency, APHA-Weybridge, Woodham Lane, New Haw, Addlestone, KT15 3NB, UK
| | - Jose Alejandro Bohórquez
- OIE Reference Laboratory for Classical Swine Fever, Institute of Agrifood Research and Technology, Centre de Recerca en Sanitat Animal (CReSA), 08193 Barcelona, Spain
| | - Alexander Postel
- EU & OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine, Hannover, Buenteweg 17, 30559 Hannover, Germany
| | - Yoshihiro Sakoda
- Laboratory of Microbiology, Faculty of Veterinary Medicine, Hokkaido University, Kita 18 Nishi 9, Kita-ku, Sapporo, 060-0818, Japan
| | - Paul Becher
- EU & OIE Reference Laboratory for Classical Swine Fever, Institute of Virology, University of Veterinary Medicine, Hannover, Buenteweg 17, 30559 Hannover, Germany
| | - Nicolas Ruggli
- The Institute of Virology and Immunology IVI, Mittelhäusern, Switzerland; Department of Infectious Diseases and Pathobiology, University of Bern, Bern, Switzerland
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Tomar NR, Bhat IA, Bharti MK, John JK, Sharma V, Chandra V, Sharma GT, Saikumar G. Isolation and propagation of classical swine fever virus in porcine Wharton's Jelly mesenchymal stem cells. Anim Biotechnol 2020; 33:629-637. [PMID: 32885744 DOI: 10.1080/10495398.2020.1813151] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Classical Swine Fever (CSF) is an extremely infectious and deadly disease of pigs and wild boars caused by the CSF virus (CSFV) which is a member of the Pestivirus genus and the family Flaviviridae. This study was designed to detect the permissibility and replication of CSFV in mesenchymal stem cells (MSCs) monolayer derived from Porcine Wharton's jelly. Porcine Wharton's jelly MSCs (pWJ-MSCs) were ex vivo expanded and propagated for more than 81 generations and third passage pWJ-MSCs were characterized as per standard criteria i.e., growth characteristics, trilineage differentiation potential and molecular characterization for pluripotency and stem cell surface markers. Porcine WJ tissue samples found negative for CSFV by RT-PCR test were processed further for the isolation of pWJ-MSCs and CSFV was propagated over the characterized pWJ-MSCs monolayer. No cytopathic effect was observed, which was consistent with non-cytopathic nature of CSFV. The replication of CSFV in pWJ-MSCs was affirmed by RT-PCR and demonstration of viral antigen in the cytoplasm of virus infected cells by immuno-staining technique. In total, three different CSFV isolates were propagated in pWJ-MSCs. Primary pWJ-MSCs permitted CSFV replication to good titer. To the best of our information, this is the first ever report of isolation of CSFV in pWJ-MSCs.
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Affiliation(s)
- Neelam R Tomar
- Division of Veterinary Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, India
| | - Irfan A Bhat
- Division of Physiology and Climatology, ICAR-Indian Veterinary Research Institute, Izatnagar, India
| | - Mukesh K Bharti
- Department of Veterinary Physiology and Biochemistry, Faculty of Veterinary and Animal Sciences, Rajiv Gandhi South Campus Banaras Hindu University, Barkachha, Mirzapur, India
| | - Jeny K John
- Division of Veterinary Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, India
| | - Veena Sharma
- Department of Bioscience and Biotechnology, Banasthali University, Jaipur, India
| | - Vikash Chandra
- Division of Physiology and Climatology, ICAR-Indian Veterinary Research Institute, Izatnagar, India
| | - G Taru Sharma
- Division of Physiology and Climatology, ICAR-Indian Veterinary Research Institute, Izatnagar, India
| | - G Saikumar
- Division of Veterinary Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, India
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Wang L, Madera R, Li Y, McVey DS, Drolet BS, Shi J. Recent Advances in the Diagnosis of Classical Swine Fever and Future Perspectives. Pathogens 2020; 9:pathogens9080658. [PMID: 32824178 PMCID: PMC7460108 DOI: 10.3390/pathogens9080658] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2020] [Revised: 08/09/2020] [Accepted: 08/13/2020] [Indexed: 11/16/2022] Open
Abstract
Classical swine fever (CSF) is a highly contagious viral disease of pigs, including wild boar. It is regarded as one of the major problems in the pig industry as it is still endemic in many regions of the world and has the potential to cause devastating epidemics, particularly in countries free of the disease. Rapid and reliable diagnosis is of utmost importance in the control of CSF. Since clinical presentations of CSF are highly variable and may be confused with other viral diseases in pigs, laboratory diagnosis is indispensable for an unambiguous diagnosis. On an international level, well-established diagnostic tests of CSF such as virus isolation, fluorescent antibody test (FAT), antigen capture antibody enzyme-linked immunosorbent assay (ELISA), reverse-transcription polymerase chain reaction (RT-PCR), virus neutralization test (VNT), and antibody ELISA have been described in detail in the OIE Terrestrial Manual. However, improved CSF diagnostic methods or alternatives based on modern technologies have been developed in recent years. This review thus presents recent advances in the diagnosis of CSF and future perspectives.
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Affiliation(s)
- Lihua Wang
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA; (R.M.); (Y.L.)
- Correspondence: (L.W.); (J.S.); Tel.: +1-785-532-4397 (L.W.); +1-785-532-4506 (J.S.)
| | - Rachel Madera
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA; (R.M.); (Y.L.)
| | - Yuzhen Li
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA; (R.M.); (Y.L.)
| | - David Scott McVey
- United States Department of Agriculture, Arthropod-Borne Animal Diseases Research Unit, Center for Grain and Animal Health Research, Manhattan, KS 66502, USA; (D.S.M.); (B.S.D.)
| | - Barbara S. Drolet
- United States Department of Agriculture, Arthropod-Borne Animal Diseases Research Unit, Center for Grain and Animal Health Research, Manhattan, KS 66502, USA; (D.S.M.); (B.S.D.)
| | - Jishu Shi
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS 66506, USA; (R.M.); (Y.L.)
- Correspondence: (L.W.); (J.S.); Tel.: +1-785-532-4397 (L.W.); +1-785-532-4506 (J.S.)
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42
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Fukai K, Nishi T, Yamada M, Ikezawa M. Toward better control of classical swine fever in wild boars: susceptibility of boar-pig hybrids to a recent Japanese isolate and effectiveness of a bait vaccine. Vet Res 2020; 51:96. [PMID: 32736657 PMCID: PMC7393845 DOI: 10.1186/s13567-020-00821-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 07/16/2020] [Indexed: 11/22/2022] Open
Abstract
We analyzed the pathogenicity of a recent Japanese classical swine fever virus (CSFV) to wild boars via an experimental infection using boar-pig hybrids as an alternative to wild boars. We also investigated the effectiveness of a bait vaccine against the CSFV. Naïve boar-pig hybrids and pigs showed clinical signs such as fever, leucopenia, anorexia and conjunctivitis following the experimental infection. In contrast, the boar-pig hybrids administered the bait vaccine did not show any clinical signs. Our data indicated that boar-pig hybrids and domestic pigs have similar susceptibility to the recent Japanese CSFV. Additionally, the bait vaccine is effective against the CSFV.
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Affiliation(s)
- Katsuhiko Fukai
- Exotic Disease Research Station, National Institute of Animal Health, National Agriculture and Food Research Organization, 6-20-1 Josui-honcho, Kodaira, Tokyo, 187-0022, Japan.
| | - Tatsuya Nishi
- Exotic Disease Research Station, National Institute of Animal Health, National Agriculture and Food Research Organization, 6-20-1 Josui-honcho, Kodaira, Tokyo, 187-0022, Japan
| | - Manabu Yamada
- National Institute of Animal Health, National Agriculture and Food Research Organization, 3-1-5 Kannondai, Tsukuba, Ibaraki, 305-0856, Japan
| | - Mitsutaka Ikezawa
- National Institute of Animal Health, National Agriculture and Food Research Organization, 3-1-5 Kannondai, Tsukuba, Ibaraki, 305-0856, Japan
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AKSHAYA R, RAMESH A, LOGESH K, SANGEETHA R, VIJAYARANI K, KUMANAN K, GNANARAJ PTENSINGH, RAJ GDHINAKAR. Adaptability of a field isolate of Classical swine fever virus to PK-15 cells. THE INDIAN JOURNAL OF ANIMAL SCIENCES 2020. [DOI: 10.56093/ijans.v90i3.102515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Classical swine fever (CSF) is an economically important pig disease affecting rural pig farming and vaccines are not freely available for control. In the present study an Indian isolate of CSF virus was passaged 75 times in PK-15 cells. At different passages, presence of virus was confirmed by Fluorescent Antibody Virus Neutralization (FAVN) test and Reverse Transcription-Polymerase Chain Reaction (RTPCR) for NS5B, E2 and 5-UTR genes. TCID50 titers were found to range between 4.00 and 8.97 at 10th and 75th passages respectively. Back passage and pathogenicity studies in susceptible pigs, the natural host, indicated that the virus was found to be attenuated following PK-15 passages and did not produce any clinical signs after 45th and 75th passages.
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Park Y, Lee S, Kang H, Park M, Min K, Kim NH, Gu S, Kim JK, An DJ, Choe S, Sohn EJ. A classical swine fever virus E2 fusion protein produced in plants elicits a neutralizing humoral immune response in mice and pigs. Biotechnol Lett 2020; 42:1247-1261. [PMID: 32323080 PMCID: PMC7223222 DOI: 10.1007/s10529-020-02892-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 04/01/2020] [Accepted: 04/14/2020] [Indexed: 12/03/2022]
Abstract
Classical swine fever (CSF) is one of the most important viral diseases of swine worldwide. Although live or attenuated virus vaccines have been used to control CSFV, it is difficult to distinguish vaccinated pigs from infected pigs; this leads to restrictions on import and export. Subunit vaccines based on the CSFV E2 glycoprotein have been developed using baculovirus or insect cell systems, but some weaknesses remain. Here, we describe production of an E2 recombinant protein using a Nicotiana benthamiana plant expression system. To do this, we took advantage of the ability of the swine Fc domain to increase solubility and stability of the fusion protein and to strengthen immune responses in target animals. N. benthamiana expressed high amounts of pFc2-fused E2 proteins, which were isolated and purified by affinity chromatography to yield a high pure recombinant protein in a cost-effective manner. Native-polyacrylamide gel electrophoresis and size exclusion chromatography confirmed that the pmE2:pFc2 fusion exists as a multimer rather than as a dimer. Injection of recombinant pmE2 protein into mice or piglets generated anti-pmE2 antibodies with efficient neutralizing activity against CSFV. These results suggest that a purified recombinant E2 protein produced in N. benthamiana generates high titers of neutralizing antibodies in vivo; as such, the protein could be developed as a subunit vaccine against CSFV.
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Affiliation(s)
- Youngmin Park
- BioApplications Inc., Pohang Techno Park Complex, 394 Jigok-ro Nam-gu, Pohang, Korea
| | - Sangmin Lee
- BioApplications Inc., Pohang Techno Park Complex, 394 Jigok-ro Nam-gu, Pohang, Korea
| | - Hyangju Kang
- BioApplications Inc., Pohang Techno Park Complex, 394 Jigok-ro Nam-gu, Pohang, Korea
| | - Minhee Park
- BioApplications Inc., Pohang Techno Park Complex, 394 Jigok-ro Nam-gu, Pohang, Korea
| | - Kyungmin Min
- BioApplications Inc., Pohang Techno Park Complex, 394 Jigok-ro Nam-gu, Pohang, Korea
| | - Nam Hyung Kim
- BioApplications Inc., Pohang Techno Park Complex, 394 Jigok-ro Nam-gu, Pohang, Korea
| | - Sungmin Gu
- BioApplications Inc., Pohang Techno Park Complex, 394 Jigok-ro Nam-gu, Pohang, Korea
| | - Jong Kook Kim
- BioApplications Inc., Pohang Techno Park Complex, 394 Jigok-ro Nam-gu, Pohang, Korea
| | - Dong-Jun An
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimcheon, 39660, Gyeongbuk, Korea
| | - SeEun Choe
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimcheon, 39660, Gyeongbuk, Korea
| | - Eun-Ju Sohn
- BioApplications Inc., Pohang Techno Park Complex, 394 Jigok-ro Nam-gu, Pohang, Korea.
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Malik YS, Bhat S, Kumar ORV, Yadav AK, Sircar S, Ansari MI, Sarma DK, Rajkhowa TK, Ghosh S, Dhama K. Classical Swine Fever Virus Biology, Clinicopathology, Diagnosis, Vaccines and a Meta-Analysis of Prevalence: A Review from the Indian Perspective. Pathogens 2020; 9:pathogens9060500. [PMID: 32580503 PMCID: PMC7350356 DOI: 10.3390/pathogens9060500] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 06/21/2020] [Accepted: 06/21/2020] [Indexed: 12/19/2022] Open
Abstract
Classical swine fever (CSF) is an economically significant, multi-systemic, highly contagious viral disease of swine world over. The disease is notifiable to the World Organization for Animal Health (OIE) due to its enormous consequences on porcine health and the pig industry. In India, the pig population is 9.06 million and contributes around 1.7% of the total livestock population. The pig industry is not well organized and is mostly concentrated in the eastern and northeastern states of the country (~40% of the country’s population). Since the first suspected CSF outbreak in India during 1944, a large number of outbreaks have been reported across the country, and CSF has acquired an endemic status. As of date, there is a scarcity of comprehensive information on CSF from India. Therefore, in this review, we undertook a systematic review to compile and evaluate the prevalence and genetic diversity of the CSF virus situation in the porcine population from India, targeting particular virus genes sequence analysis, published reports on prevalence, pathology, and updates on indigenous diagnostics and vaccines. The CSF virus (CSFV) is genetically diverse, and at least three phylogenetic groups are circulating throughout the world. In India, though genotype 1.1 predominates, recently published reports point toward increasing evidence of co-circulation of sub-genotype 2.2 followed by 2.1. Sequence identities and phylogenetic analysis of Indian CSFV reveal high genetic divergence among circulating strains. In the meta-analysis random-effects model, the estimated overall CSF prevalence was 35.4%, encompassing data from both antigen and antibody tests, and region-wise sub-group analysis indicated variable incidence from 25% in the southern to nearly 40% in the central zone, eastern, and northeastern regions. A country-wide immunization approach, along with other control measures, has been implemented to reduce the disease incidence and eliminate the virus in time to come.
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Affiliation(s)
- Yashpal Singh Malik
- Division of Biological Standardization, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh 243001, India; (S.B.); (S.S.); (M.I.A.)
- Correspondence: (Y.S.M.); (K.D.); Tel.: +91-58-1230-2777 (Y.S.M. & K.D.); Fax: +91-58-1230-1757 (Y.S.M. & K.D.)
| | - Sudipta Bhat
- Division of Biological Standardization, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh 243001, India; (S.B.); (S.S.); (M.I.A.)
| | - O. R. Vinodh Kumar
- Division of Epidemiology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh 243122, India;
| | - Ajay Kumar Yadav
- Animal Health, ICAR-National Research Centre on Pig (ICAR-NRCP), Guwahati, Assam 781015, India;
| | - Shubhankar Sircar
- Division of Biological Standardization, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh 243001, India; (S.B.); (S.S.); (M.I.A.)
| | - Mohd Ikram Ansari
- Division of Biological Standardization, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh 243001, India; (S.B.); (S.S.); (M.I.A.)
| | - Dilip Kumar Sarma
- Department of Veterinary Microbiology, Assam Agricultural University, Khanapara, Guwahati 781022, India;
| | - Tridib Kumar Rajkhowa
- College of Veterinary Sciences & Animal Husbandry, Central Agricultural University, Selesih, Aizawl, Mizoram 796001, India;
| | - Souvik Ghosh
- Department of Biomedical Sciences, One Health Center for Zoonoses and Tropical Veterinary Medicine, Basseterre, St. Kitts PO Box 334, West Indies;
| | - Kuldeep Dhama
- Division of Pathology, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, Uttar Pradesh 243122, India
- Correspondence: (Y.S.M.); (K.D.); Tel.: +91-58-1230-2777 (Y.S.M. & K.D.); Fax: +91-58-1230-1757 (Y.S.M. & K.D.)
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Ha Z, Li J, Xie C, Yu C, Hao P, Zhang Y, Xu W, Nan F, Xie Y, Li Y, Rong F, Wang G, Guo Y, Lu H, Jin N. Prevalence, pathogenesis, and evolution of porcine circovirus type 3 in China from 2016 to 2019. Vet Microbiol 2020; 247:108756. [PMID: 32768209 DOI: 10.1016/j.vetmic.2020.108756] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2020] [Revised: 06/11/2020] [Accepted: 06/11/2020] [Indexed: 12/16/2022]
Abstract
Porcine circovirus type 3 (PCV3) infection causes substantial economic losses in pig populations since its discovery in 2016. However, PCV3 molecular epidemiology remains need further study. In order to assess the prevalence of PCV3 infection in China, 4094 clinical samples from 271 pig farms in 10 provinces of China were evaluated by PCR. It was shown that the overall prevalence of PCV3 infection was 29.3 % (1200/4094) and 74.2 % (201/271) at sample and farm levels respectively, suggesting that PCV3 infection is prevalent in China. Furthermore, a statistical analysis showed PCV3 might exacerbate PCV2 and PRRSV infection rate and have a potential association with pig clinical disease. In addition, we sequenced the entire genome of 57 PCV3 strains; homology analysis showed that PCV3 strains have more than 96 % similarities at the nucleotide level, and PCV3 shares less than 60 % similarities with other circoviruses. By comparing the total 673 PCV3 strains from the NCBI GenBank, we found the major of amino acid mutations are located in predicted epitope regions and the mutations ratio changed during PCV3 evolution. Phylogenetic analysis revealed that all isolates belonged to PCV3a and PCV3b, and increasing PCV3a and decreasing PCV3b trends were observed during PCV3 evolution. Overall, this study provides important insights for understanding PCV3 prevalence, pathogenesis, and evolution and will guide future efforts to develop effective preventive and control measures.
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Affiliation(s)
- Zhuo Ha
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, 130122, China; College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, China
| | - Jinfeng Li
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, 130122, China; College of Veterinary Medicine, Jilin University, Changchun, 130012, China
| | - Changzhan Xie
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, 130122, China
| | - Chengdong Yu
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, 130122, China
| | - Pengfei Hao
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, 130122, China
| | - Ying Zhang
- College of Veterinary Medicine, Jilin University, Changchun, 130012, China
| | - Wang Xu
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, 130122, China
| | - Fulong Nan
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, 130122, China; College of Veterinary Medicine, Jilin University, Changchun, 130012, China
| | - Yubiao Xie
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, 130122, China
| | - Yanwei Li
- National Engineering Research Center of Veterinary Biologics, Harbin, 150001, China
| | - Fulong Rong
- Harbin Pharmaceutical Group Bio-vaccine Co., Ltd, Harbin, 150030, China
| | - Guanyu Wang
- Hulunbuir Animal Disease Control Center, Hulunbuir, 021000, China
| | - Yingcheng Guo
- Jilin Fengman Area Animal Prevention and Control Center, Jilin, 132013, China
| | - Huijun Lu
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, 130122, China; Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou University, Yangzhou, 225009, China.
| | - Ningyi Jin
- Institute of Military Veterinary Medicine, Academy of Military Medical Sciences, Changchun, 130122, China; College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, China; Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou University, Yangzhou, 225009, China.
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In Vivo Demonstration of the Superior Replication and Infectivity of Genotype 2.1 with Respect to Genotype 3.4 of Classical Swine Fever Virus by Dual Infections. Pathogens 2020; 9:pathogens9040261. [PMID: 32260208 PMCID: PMC7238001 DOI: 10.3390/pathogens9040261] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 04/02/2020] [Accepted: 04/02/2020] [Indexed: 02/08/2023] Open
Abstract
In Taiwan, the prevalent CSFV population has shifted from the historical genotype 3.4 (94.4 strain) to the newly invading genotype 2.1 (TD/96 strain) since 1996. This study analyzed the competition between these two virus genotypes in dual infection pigs with equal and different virus populations and with maternally derived neutralizing antibodies induced by a third genotype of modified live vaccine (MLV), to simulate that occurring in natural situations in the field. Experimentally, under various dual infection conditions, with or without the presence of maternal antibodies, with various specimens from blood, oral and fecal swabs, and internal organs at various time points, the TD/96 had consistently 1.51-3.08 log higher loads than those of 94.4. A second passage of competition in the same animals further widened the lead of TD/96 as indicated by viral loads. The maternally derived antibodies provided partial protection to both wild type CSFVs and was correlated with lower clinical scores, febrile reaction, and animal mortality. In the presence of maternal antibodies, pigs could be infected by both wild type CSFVs, with TD/96 dominating. These findings partially explain the CSFV shift observed, furthering our understanding of CSFV pathogenesis in the field, and are helpful for the control of CSF.
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Giangaspero M, Zhang SQ. Genomic characteristics of classical swine fever virus strains of bovine origin according to primary and secondary sequence-structure analysis. Open Vet J 2020; 10:94-115. [PMID: 32426263 PMCID: PMC7193884 DOI: 10.4314/ovj.v10i1.15] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2019] [Accepted: 03/04/2020] [Indexed: 12/04/2022] Open
Abstract
Background: Classical swine fever virus (CSFV), species member of the family Flaviviridae, is generally considered restricted to domestic and wild suids. The circulation of CFSV has been detected in cattle herds in China and India. Natural infection appeared associated with clinical signs in some cases. Aim: The secondary structures of the internal ribosome entry site in the 5′ untranslated region (UTR) were used for the genomic characterization of bovine strains. Methods: Sequences have been compared to the representative CSFV strains isolated from pigs, vaccines, and contaminants from porcine cell lines and an ovine strain isolated in Spain. Results: The observed sequences from cattle showed a genetic relatedness with live-attenuated vaccine strains used in pigs. Sequence characteristics of the Chinese strain S171 are genetically distant from the previously reported CSFV genotypes, suggesting a new outgroup in the species, described for the first time, and named CSFV-d. Other Chinese strains were genetically closely related to CSFV genotype a2 (Alfort type) pig strains. Indian strains, reported from the states of Tamil Nadu and Meghalaya, were genetically closely related to CSFV genotype a1 (Brescia type) and a5 pig strains, respectively. Conclusion: These preliminary observations are new and relevant in countries, where CSFV control and eradication strategies are applied.
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Affiliation(s)
| | - Shu-Qin Zhang
- State Key Laboratory for Molecular Biology of Special Economic Animals, Institute of Special Economic Animal and Plant Sciences, No 4899 Juye Street, Changchun, Jilin, People's Republic of China
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Choe S, Cha RM, Yu DS, Kim KS, Song S, Choi SH, Jung BI, Lim SI, Hyun BH, Park BK, An DJ. Rapid Spread of Classical Swine Fever Virus among South Korean Wild Boars in Areas near the Border with North Korea. Pathogens 2020; 9:E244. [PMID: 32218239 PMCID: PMC7238106 DOI: 10.3390/pathogens9040244] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 03/24/2020] [Accepted: 03/24/2020] [Indexed: 11/16/2022] Open
Abstract
There has been a rapid increase in the number of classical swine fever (CSF) sero-positive wild boars captured near the demilitarized zone (DMZ), located the border with North Korea. In 2015-2016, few CSFV-positive antibody boars were detected; however, the number has increased steeply since 2017. Most occurred in the northern region of Gyeonggi before spreading slowly to Gangwon (west to east) in 2018-2019. Multi-distance spatial cluster analysis provided an indirect estimate of the time taken for CSFV to spread among wild boars: 46.7, 2.6, and 2.49 days/km. The average CSF serum neutralization antibody titer was 4-10 (log 2), and CSFV Ab B-ELISA PI values ranged from 65.5 to 111.5, regardless of the age and sex of wild boars. Full genome analysis revealed that 16 CSFV strains isolated from wild boars between 2017 and 2019 were identical to the YC16CS strain (sub-genotype 2.1d) isolated from an outbreak in breeding pigs near the border with North Korea in 2016. The rapid increase in CSF in wild boars may be due to a continuously circulating infection within hub area and increased population density. The distribution pattern of CSFV in Korean wild boars moves from west to southeast, affected by external factors, including small-scale hunting, geographical features and highways.
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Affiliation(s)
- SeEun Choe
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do 39660, Korea; (S.C.); (R.M.C.); (K.-S.K.); (S.S.); (S.-I.L.); (B.-H.H.); (B.-K.P.)
| | - Ra Mi Cha
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do 39660, Korea; (S.C.); (R.M.C.); (K.-S.K.); (S.S.); (S.-I.L.); (B.-H.H.); (B.-K.P.)
| | - Dae-Sung Yu
- Division of Veterinary Epidemiological, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do 39660, Korea;
| | - Ki-Sun Kim
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do 39660, Korea; (S.C.); (R.M.C.); (K.-S.K.); (S.S.); (S.-I.L.); (B.-H.H.); (B.-K.P.)
| | - Sok Song
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do 39660, Korea; (S.C.); (R.M.C.); (K.-S.K.); (S.S.); (S.-I.L.); (B.-H.H.); (B.-K.P.)
| | - Sung-Hyun Choi
- Korea Pork Producers Association, Seocho-gu, Seoul 06643, Korea; (S.-H.C.); (B.-I.J.)
| | - Byung-Il Jung
- Korea Pork Producers Association, Seocho-gu, Seoul 06643, Korea; (S.-H.C.); (B.-I.J.)
| | - Seong-In Lim
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do 39660, Korea; (S.C.); (R.M.C.); (K.-S.K.); (S.S.); (S.-I.L.); (B.-H.H.); (B.-K.P.)
| | - Bang-Hun Hyun
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do 39660, Korea; (S.C.); (R.M.C.); (K.-S.K.); (S.S.); (S.-I.L.); (B.-H.H.); (B.-K.P.)
| | - Bong-Kyun Park
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do 39660, Korea; (S.C.); (R.M.C.); (K.-S.K.); (S.S.); (S.-I.L.); (B.-H.H.); (B.-K.P.)
- College of Veterinary Medicine, Seoul University, Gwanak-ro, Gwanak-gu, Seoul 08826, Korea
| | - Dong-Jun An
- Virus Disease Division, Animal and Plant Quarantine Agency, Gimchen, Gyeongbuk-do 39660, Korea; (S.C.); (R.M.C.); (K.-S.K.); (S.S.); (S.-I.L.); (B.-H.H.); (B.-K.P.)
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50
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Zheng G, Li LF, Zhang Y, Qu L, Wang W, Li M, Yu S, Zhou M, Luo Y, Sun Y, Munir M, Li S, Qiu HJ. MERTK is a host factor that promotes classical swine fever virus entry and antagonizes innate immune response in PK-15 cells. Emerg Microbes Infect 2020; 9:571-581. [PMID: 32172658 PMCID: PMC7144274 DOI: 10.1080/22221751.2020.1738278] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Classical swine fever virus (CSFV) is a member of the genus Pestivirus in the Flaviviridae family. To date, the host factors required for CSFV entry remain poorly characterized. To identify the functional membrane protein(s) involved in CSFV infection, we analyzed the transcriptomic data from previous studies describing gene expression profiles for CSFV, and found twelve novel candidate proteins. One of these proteins, MERTK, significantly reduced CSFV protein expression by RNA interference screening using a recombinant CSFV that contains a luciferase reporter to measure CSFV protein expression. Furthermore, our results demonstrated that either anti-MERTK antibodies or soluble MERTK ectodomain could reduce CSFV infection in PK-15 cells in a dose-dependent manner. Mechanistically, MERTK interacted with the E2 protein of CSFV and facilitated virus entry. After virus entry, MERTK downregulates of mRNA expression of IFN-β and promotes CSFV infection. Interestingly, the soluble MERTK ectodomain could also reduce the infection of bovine viral diarrhea virus (BVDV), another pestivirus. Taken together, our results suggested that MERTK is a CSFV entry factor that synergistically dampens innate immune responses in PK-15 cells and is also involved in BVDV infection.
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Affiliation(s)
- Guanglai Zheng
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Lian-Feng Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Yuexiu Zhang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Liang Qu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Wenjing Wang
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Miao Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Shaoxiong Yu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Mo Zhou
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Yuzi Luo
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Yuan Sun
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Muhammad Munir
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, Lancaster University, United Kingdom
| | - Su Li
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
| | - Hua-Ji Qiu
- State Key Laboratory of Veterinary Biotechnology, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, People's Republic of China
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