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Li P, Huang S, Zha J, Sun P, Li D, Bao H, Cao Y, Bai X, Fu Y, Ma X, Li K, Yuan H, Zhang J, Zhao Z, Wang J, Zhang K, Chen Y, Zhang Q, Qi S, Liu Z, Lu Z. Evaluation of immunogenicity and cross-reactive responses of vaccines prepared from two chimeric serotype O foot-and-mouth disease viruses in pigs and cattle. Vet Res 2022; 53:56. [PMID: 35804412 PMCID: PMC9270804 DOI: 10.1186/s13567-022-01072-7] [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: 02/15/2022] [Accepted: 05/22/2022] [Indexed: 11/21/2022] Open
Abstract
Foot-and-mouth disease (FMD) remains a very serious barrier to agricultural development and the international trade of animals and animal products. Recently, serotype O has been the most prevalent FMDV serotype in China, and it has evolved into four different lineages: O/SEA/Mya-98, O/ME-SA/PanAsia, O/ME-SA/Ind-2001 and O/Cathay. PanAsia-2, belonging to the O/ME-SA topotype, is prevalent in neighbouring countries and poses the risk of cross-border spread in China. This study aimed to develop a promising vaccine candidate strain that can not only provide the best protection against all serotype O FMDVs circulating in China but also be used as an emergency vaccine for the prevention and control of transboundary incursion of PanAsia-2. Here, two chimeric FMDVs (rHN/TURVP1 and rHN/NXVP1) featuring substitution of VP1 genes of the O/TUR/5/2009 vaccine strain (PanAsia-2) and O/NXYCh/CHA/2018 epidemic strain (Mya98) were constructed and evaluated. The biological properties of the two chimeric FMDVs were similar to those of the wild-type (wt) virus despite slight differences in plaque sizes observed in BHK-21 cells. The structural protein-specific antibody titres induced by the rHN/TURVP1 and wt virus vaccines in pigs and cows were higher than those induced by the rHN/NXVP1 vaccine at 28–56 dpv. The vaccines prepared from the two chimeric viruses and wt virus all induced the production of protective cross-neutralizing antibodies against the viruses of the Mya-98, PanAsia and Ind-2001 lineages in pigs and cattle at 28 dpv; however, only the animals vaccinated with the rHN/TURVP1 vaccine produced a protective immune response to the field isolate of the Cathay lineage at 28 dpv, whereas the animals receiving the wt virus and the rHN/NXVP1 vaccines did not, although the wt virus and O/GXCX/CHA/2018 both belong to the Cathay topotype. This study will provide very useful information to help develop a potential vaccine candidate for the prevention and control of serotype O FMD in China.
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Affiliation(s)
- Pinghua Li
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Shulun Huang
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Jingjing Zha
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Pun Sun
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Dong Li
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Huifang Bao
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Yimei Cao
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Xingwen Bai
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Yuanfang Fu
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Xueqing Ma
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Kun Li
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Hong Yuan
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Jing Zhang
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Zhixun Zhao
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Jian Wang
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Keqiang Zhang
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Yingli Chen
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Qiang Zhang
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Shuyun Qi
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Zaixin Liu
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China.
| | - Zengjun Lu
- State Key Laboratory of Veterinary Etiological Biology, OIE/National Foot-and-Mouth Disease Reference Laboratory of China, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China.
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Semkum P, Kaewborisuth C, Thangthamniyom N, Theerawatanasirikul S, Lekcharoensuk C, Hansoongnern P, Ramasoota P, Lekcharoensuk P. A Novel Plasmid DNA-Based Foot and Mouth Disease Virus Minigenome for Intracytoplasmic mRNA Production. Viruses 2021; 13:1047. [PMID: 34205958 PMCID: PMC8229761 DOI: 10.3390/v13061047] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/24/2021] [Accepted: 05/26/2021] [Indexed: 12/13/2022] Open
Abstract
Picornaviruses are non-enveloped, single-stranded RNA viruses that cause highly contagious diseases, such as polio and hand, foot-and-mouth disease (HFMD) in human, and foot-and-mouth disease (FMD) in animals. Reverse genetics and minigenome of picornaviruses mainly depend on in vitro transcription and RNA transfection; however, this approach is inefficient due to the rapid degradation of RNA template. Although DNA-based reverse genetics systems driven by mammalian RNA polymerase I and/or II promoters display the advantage of rescuing the engineered FMDV, the enzymatic functions are restricted in the nuclear compartment. To overcome these limitations, we successfully established a novel DNA-based vector, namely pKLS3, an FMDV minigenome containing the minimum cis-acting elements of FMDV essential for intracytoplasmic transcription and translation of a foreign gene. A combination of pKLS3 minigenome and the helper plasmids yielded the efficient production of uncapped-green florescent protein (GFP) mRNA visualized in the transfected cells. We have demonstrated the application of the pKLS3 for cell-based antiviral drug screening. Not only is the DNA-based FMDV minigenome system useful for the FMDV research and development but it could be implemented for generating other picornavirus minigenomes. Additionally, the prospective applications of this viral minigenome system as a vector for DNA and mRNA vaccines are also discussed.
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Affiliation(s)
- Ploypailin Semkum
- Interdisciplinary Graduate Program in Genetic Engineering, The Graduate School, Kasetsart University, Bangkok 10900, Thailand;
- Department of Microbiology and Immunology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand; (N.T.); (P.H.)
- Center for Advanced Studies in Agriculture and Food, KU Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand
| | - Challika Kaewborisuth
- Virology and Cell Technology Research Team, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani 12120, Thailand;
| | - Nattarat Thangthamniyom
- Department of Microbiology and Immunology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand; (N.T.); (P.H.)
| | - Sirin Theerawatanasirikul
- Department of Anatomy, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand;
| | - Chalermpol Lekcharoensuk
- Department of Companion Animal Clinical Sciences, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand;
| | - Payuda Hansoongnern
- Department of Microbiology and Immunology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand; (N.T.); (P.H.)
| | - Pongrama Ramasoota
- Department of Social and Environmental Medicine, Faculty of Tropical Medicine, Mahidol University, Bangkok 10400, Thailand;
| | - Porntippa Lekcharoensuk
- Department of Microbiology and Immunology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand; (N.T.); (P.H.)
- Center for Advanced Studies in Agriculture and Food, KU Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand
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3
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Chitray M, Kotecha A, Nsamba P, Ren J, Maree S, Ramulongo T, Paul G, Theron J, Fry EE, Stuart DI, Maree FF. Symmetrical arrangement of positively charged residues around the 5-fold axes of SAT type foot-and-mouth disease virus enhances cell culture of field viruses. PLoS Pathog 2020; 16:e1008828. [PMID: 32991636 PMCID: PMC7577442 DOI: 10.1371/journal.ppat.1008828] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Revised: 10/21/2020] [Accepted: 07/22/2020] [Indexed: 11/18/2022] Open
Abstract
Field isolates of foot-and-mouth disease viruses (FMDVs) utilize integrin-mediated cell entry but many, including Southern African Territories (SAT) viruses, are difficult to adapt to BHK-21 cells, thus hampering large-scale propagation of vaccine antigen. However, FMDVs acquire the ability to bind to cell surface heparan sulphate proteoglycans, following serial cytolytic infections in cell culture, likely by the selection of rapidly replicating FMDV variants. In this study, fourteen SAT1 and SAT2 viruses, serially passaged in BHK-21 cells, were virulent in CHO-K1 cells and displayed enhanced affinity for heparan, as opposed to their low-passage counterparts. Comparative sequence analysis revealed the fixation of positively charged residues clustered close to the icosahedral 5-fold axes of the virus, at amino acid positions 83-85 in the βD-βE loop and 110-112 in the βF-βG loop of VP1 upon adaptation to cultured cells. Molecular docking simulations confirmed enhanced binding of heparan sulphate to a model of the adapted SAT1 virus, with the region around VP1 arginine 112 contributing the most to binding. Using this information, eight chimeric field strain mutant viruses were constructed with additional positive charges in repeated clusters on the virion surface. Five of these bound heparan sulphate with expanded cell tropism, which should facilitate large-scale propagation. However, only positively charged residues at position 110-112 of VP1 enhanced infectivity of BHK-21 cells. The symmetrical arrangement of even a single amino acid residue in the FMD virion is a powerful strategy enabling the virus to generate novel receptor binding and alternative host-cell interactions.
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Affiliation(s)
- Melanie Chitray
- Vaccine and Diagnostic Development Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort, South Africa
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
| | - Abhay Kotecha
- Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Headington, Oxford, United Kingdom
| | - Peninah Nsamba
- Vaccine and Diagnostic Development Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort, South Africa
- Department of Veterinary Tropical Diseases, Faculty of Veterinary Sciences, University of Pretoria, Onderstepoort, South Africa
- Makerere University, College of Veterinary Medicine, Animal Resources and Biosecurity, Kampala, Uganda
| | - Jingshan Ren
- Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Headington, Oxford, United Kingdom
| | - Sonja Maree
- Vaccine and Diagnostic Development Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort, South Africa
| | - Tovhowani Ramulongo
- Vaccine and Diagnostic Development Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort, South Africa
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
| | | | - Jacques Theron
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
| | - Elizabeth E. Fry
- Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Headington, Oxford, United Kingdom
| | - David I. Stuart
- Division of Structural Biology, The Henry Wellcome Building for Genomic Medicine, Roosevelt Drive, Headington, Oxford, United Kingdom
| | - Francois F. Maree
- Vaccine and Diagnostic Development Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort, South Africa
- Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, South Africa
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4
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Ramulongo TD, Maree FF, Scott K, Opperman P, Mutowembwa P, Theron J. Pathogenesis, biophysical stability and phenotypic variance of SAT2 foot-and-mouth disease virus. Vet Microbiol 2020; 243:108614. [PMID: 32273026 DOI: 10.1016/j.vetmic.2020.108614] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 02/14/2020] [Accepted: 02/16/2020] [Indexed: 11/27/2022]
Abstract
Foot-and-mouth disease (FMD) is a highly contagious vesicular disease of cloven-hoofed animals, which severely decreases livestock productivity. FMD virus (FMDV), the causative agent, initiates infection by interaction with integrin cellular receptors on pharyngeal epithelium cells, causing clinical signs one to four days after transmission to a susceptible host. However, some Southern African Territories (SAT) viruses have been reported to cause mild or subclinical infections that may go undiagnosed in field conditions and are likely to be more common than previously expected. The studies presented here demonstrate that not all SAT2 viruses are equally virulent in cattle. The two SAT2 viruses, ZIM/5/83 and ZIM/7/83, were both highly attenuated in cattle, as evidenced by the mild clinical signs observed after needle challenge, while two incongruent SAT2 viruses showed significantly different clinical signs in challenged cattle. We then explored the ability of the SAT2 viruses to infect different cell types with defined receptors that are utilised by FMDV and found differences in their ability to lyse cells in culture and to compete in a controlled cell culture environment. The population sequence variation between ZIM/5/83 and ZIM/7/83 revealed multiple sites of single nucleotide variants of low frequency between the predominant virus populations, as could be expected from the genome of an RNA virus. An assessment of the biophysical stability of SAT2 virions during acidification indicated that the SAT2 virus EGY/09/12 was more resilient to acidification than the ZIM/5/83 and ZIM/7/83 viruses; however, whether this difference relates to differences in virulence in vivo is unclear. This study is a consolidated view of the key findings of SAT2 viruses studied over a 14-year period involving many different experiments.
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Affiliation(s)
- Tovhowani D Ramulongo
- Transboundary Animal Diseases, Vaccine and Diagnostic Development Programme, Onderstepoort Veterinary Research Institute, Agricultural Research Council, Onderstepoort, Pretoria, 0110, South Africa; Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, 0002, South Africa
| | - Francois F Maree
- Transboundary Animal Diseases, Vaccine and Diagnostic Development Programme, Onderstepoort Veterinary Research Institute, Agricultural Research Council, Onderstepoort, Pretoria, 0110, South Africa; Department of Biochemistry, Genetics and Microbiology, Faculty of Natural and Agricultural Sciences, University of Pretoria, Pretoria, 0002, South Africa.
| | - Katherine Scott
- Transboundary Animal Diseases, Vaccine and Diagnostic Development Programme, Onderstepoort Veterinary Research Institute, Agricultural Research Council, Onderstepoort, Pretoria, 0110, South Africa
| | - Pamela Opperman
- Transboundary Animal Diseases, Vaccine and Diagnostic Development Programme, Onderstepoort Veterinary Research Institute, Agricultural Research Council, Onderstepoort, Pretoria, 0110, South Africa; Department Animal Production Studies, Faculty of Veterinary Sciences, University of Pretoria, Pretoria, 0110, South Africa
| | - Paidamwoyo Mutowembwa
- Transboundary Animal Diseases, Vaccine Production Programme, Onderstepoort Veterinary Research Institute, Agricultural Research Council, Onderstepoort, Pretoria, 0110, South Africa
| | - Jacques Theron
- Department Animal Production Studies, Faculty of Veterinary Sciences, University of Pretoria, Pretoria, 0110, South Africa
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5
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Scott KA, Maake L, Botha E, Theron J, Maree FF. Inherent biophysical stability of foot-and-mouth disease SAT1, SAT2 and SAT3 viruses. Virus Res 2019; 264:45-55. [PMID: 30807778 DOI: 10.1016/j.virusres.2019.02.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 02/19/2019] [Accepted: 02/19/2019] [Indexed: 11/25/2022]
Abstract
Foot-and-mouth disease (FMD) virus (FMDV) isolates show variation in their ability to withstand an increase in temperature. The FMDV is surprisingly thermolabile, even though this virus is probably subjected to a strong extracellular selective pressure by heat in hot climate regions where FMD is prevalent. The three SAT serotypes, with their particularly low biophysical stability also only yield vaccines of low protective capacity, even with multiple booster vaccinations. The aim of the study was to determine the inherent biophysical stability of field SAT isolates. To characterise the biophysical stability of 20 SAT viruses from Southern Africa, the thermofluor assay was used to monitor capsid dissociation by the release of the RNA genome under a range of temperature, pH and ionic conditions. The SAT2 and SAT3 viruses had a similar range of thermostability of 48-54 °C. However, the SAT1 viruses had a wider range of thermostability with an 8 °C difference but with many viruses being unstable at 43-46 °C. The thermostable A-serotype A24 control virus had the highest thermostability of 55 °C with some SAT2 and SAT3 viruses of similar thermostability. There was a 10 °C difference between the most unstable SAT virus (SAT1/TAN/2/99) and the highly stable A24 control virus. SAT1 viruses were generally more stable compared to SAT2 and SAT3 viruses at the pH range of 6.7-9.1. The effect of ionic buffers on capsid stability showed that SAT1 and SAT2 viruses had an increased stability of 2-9 °C and 2-6 °C, respectively, with the addition of 1 M NaCl. This is in contrast to the SAT3 viruses, which did not show improved stabilisation after addition of 1 M or 0.5 M NaCl buffers. Some buffers showed differing results dependent on the virus tested, highlighting the need to test SAT viruses with different solutions to establish the most stabilising option for storage of each virus. This study confirms for the first time that more stable SAT field viruses are present in the southern Africa region. This could facilitate the selection of the most stable circulating field strains, for adaptation to cultured BHK-21 cells or manipulation by reverse genetics and targeted mutation to produce improved vaccine master seed viruses.
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Affiliation(s)
- Katherine A Scott
- Vaccine and Diagnostic Development Programme, Transboundary Animal Diseases, Onderstepoort Veterinary Institute, Agricultural Research Council, Private Bag X05, Onderstepoort, 0110, South Africa; Department of Veterinary Tropical Diseases, Faculty of Veterinary Science University of Pretoria, Private Bag X04, Onderstepoort, 0110, South Africa.
| | - Lorens Maake
- Vaccine and Diagnostic Development Programme, Transboundary Animal Diseases, Onderstepoort Veterinary Institute, Agricultural Research Council, Private Bag X05, Onderstepoort, 0110, South Africa; Department of Biochemistry, Genetics and Microbiology, Faculty of Agricultural and Natural Sciences, University of Pretoria, Pretoria 0002, South Africa
| | - Elizabeth Botha
- Vaccine and Diagnostic Development Programme, Transboundary Animal Diseases, Onderstepoort Veterinary Institute, Agricultural Research Council, Private Bag X05, Onderstepoort, 0110, South Africa; Department of Biochemistry, Genetics and Microbiology, Faculty of Agricultural and Natural Sciences, University of Pretoria, Pretoria 0002, South Africa
| | - Jacques Theron
- Department of Biochemistry, Genetics and Microbiology, Faculty of Agricultural and Natural Sciences, University of Pretoria, Pretoria 0002, South Africa
| | - Francois F Maree
- Vaccine and Diagnostic Development Programme, Transboundary Animal Diseases, Onderstepoort Veterinary Institute, Agricultural Research Council, Private Bag X05, Onderstepoort, 0110, South Africa; Department of Biochemistry, Genetics and Microbiology, Faculty of Agricultural and Natural Sciences, University of Pretoria, Pretoria 0002, South Africa.
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6
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Zou X, Zhu Y, Bao H, Guo X, Sun P, Liu Z, Mason PW, Xu L, Li C, Zhang Q, Wang Q, Zhu H, Zhao Q. Recombination of host cell mRNA with the Asia 1 foot-and-mouth disease virus genome in cell suspension culture. Arch Virol 2018; 164:41-50. [PMID: 30232612 DOI: 10.1007/s00705-018-4008-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Accepted: 08/14/2018] [Indexed: 01/22/2023]
Abstract
Foot-and-mouth disease virus (FMDV) exhibits high mutation rates during replication. In this study, an isolate of FMDV serotype Asia-1 was serially passaged in a BHK-21 cell monolayer and then adapted to serum-free BHK-21 cell suspension culture to produce a seed virus for production of an inactivated vaccine. Analysis of the sequence encoding the structural proteins of the virus at various passages showed the presence of overlapping peaks in sequencing electropherograms after nucleotide 619 of VP1 in viruses recovered from the fourth passage in suspension culture, suggesting the possible introduction of an insertion or deletion into this portion of the viral genome of our seed virus stock. To evaluate this phenomenon, a virus designated "Vac-Asia1-VDLV", was isolated by plaque purification from the tenth passage in suspension culture. Sequencing results showed that a 12-nt-long exogenous sequence was inserted into the 3' end of the VP1 coding region at the position where the original overlapping peaks were identified. Analysis of the host cell transcriptome showed that the 12-nt sequence was identical to a highly expressed sequence in BHK-21 cells, strongly suggesting that recombination between the FMDV genome and host cell mRNA produced the recombinant virus. A growth curve showed that the virus with the 12-nt insertion reached a peak earlier than the parental strain and that this virus had acquired the ability to bind to the cell surface by a mechanism that was not dependent on integrin or the heparan sulfate receptor. This novel pathogen-host cell recombination event is discussed in terms of the mechanism of viral RNA replication and the phenotypic constraints of FMDV biology and evolution.
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Affiliation(s)
- Xingqi Zou
- Institute of Animal Science, Chinese Academy of Agriculture Sciences, No. 2 Yuanmingyuan west Street, Haidian, Beijing, 100193, People's Republic of China.,Department of Veterinary Reference Substance Research, China Institute of Veterinary Drug Control, 8 Nandajie, Zhongguancun, Haidian, Beijing, 100081, People's Republic of China
| | - Yuanyuan Zhu
- Department of Veterinary Reference Substance Research, China Institute of Veterinary Drug Control, 8 Nandajie, Zhongguancun, Haidian, Beijing, 100081, People's Republic of China
| | - Huifang Bao
- Lanzhou Veterinary Research Institute, Chinese Academy of Agriculture Sciences, Gansu, People's Republic of China
| | - Xiaoyu Guo
- Institute of Animal Science, Chinese Academy of Agriculture Sciences, No. 2 Yuanmingyuan west Street, Haidian, Beijing, 100193, People's Republic of China
| | - Pu Sun
- Lanzhou Veterinary Research Institute, Chinese Academy of Agriculture Sciences, Gansu, People's Republic of China
| | - Zaixin Liu
- Lanzhou Veterinary Research Institute, Chinese Academy of Agriculture Sciences, Gansu, People's Republic of China
| | - Peter W Mason
- Department of Pathology, University of Texas Medical Branch (UTMB), Galveston, TX, 77555, USA
| | - Lu Xu
- Department of Veterinary Reference Substance Research, China Institute of Veterinary Drug Control, 8 Nandajie, Zhongguancun, Haidian, Beijing, 100081, People's Republic of China
| | - Cui Li
- Department of Veterinary Reference Substance Research, China Institute of Veterinary Drug Control, 8 Nandajie, Zhongguancun, Haidian, Beijing, 100081, People's Republic of China
| | - Qianyi Zhang
- Department of Veterinary Reference Substance Research, China Institute of Veterinary Drug Control, 8 Nandajie, Zhongguancun, Haidian, Beijing, 100081, People's Republic of China
| | - Qin Wang
- Department of Veterinary Reference Substance Research, China Institute of Veterinary Drug Control, 8 Nandajie, Zhongguancun, Haidian, Beijing, 100081, People's Republic of China
| | - Hongfei Zhu
- Institute of Animal Science, Chinese Academy of Agriculture Sciences, No. 2 Yuanmingyuan west Street, Haidian, Beijing, 100193, People's Republic of China.
| | - Qizu Zhao
- Department of Veterinary Reference Substance Research, China Institute of Veterinary Drug Control, 8 Nandajie, Zhongguancun, Haidian, Beijing, 100081, People's Republic of China.
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7
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Kotecha A, Perez-Martin E, Harvey Y, Zhang F, Ilca SL, Fry EE, Jackson B, Maree F, Scott K, Hecksel CW, Harmsen MM, Mioulet V, Wood B, Juleff N, Stuart DI, Charleston B, Seago J. Chimeric O1K foot-and-mouth disease virus with SAT2 outer capsid as an FMD vaccine candidate. Sci Rep 2018; 8:13654. [PMID: 30209254 PMCID: PMC6135822 DOI: 10.1038/s41598-018-31856-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2018] [Accepted: 08/24/2018] [Indexed: 12/25/2022] Open
Abstract
Foot-and-mouth disease virus (FMDV) is highly contagious and infects cloven-hoofed domestic livestock leading to foot-and-mouth disease (FMD). FMD outbreaks have severe economic impact due to production losses and associated control measures. FMDV is found as seven distinct serotypes, but there are numerous subtypes within each serotype, and effective vaccines must match the subtypes circulating in the field. In addition, the O and Southern African Territories (SAT) serotypes, are relatively more thermolabile and their viral capsids readily dissociate into non-immunogenic pentameric subunits, which can compromise the effectiveness of FMD vaccines. Here we report the construction of a chimeric clone between the SAT2 and O serotypes, designed to have SAT2 antigenicity. Characterisation of the chimeric virus showed growth kinetics equal to that of the wild type SAT2 virus with better thermostability, attributable to changes in the VP4 structural protein. Sequence and structural analyses confirmed that no changes from SAT2 were present elsewhere in the capsid as a consequence of the VP4 changes. Following exposure to an elevated temperature the thermostable SAT2-O1K chimera induced higher neutralizing-antibody titres in comparison to wild type SAT2 virus.
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Affiliation(s)
- Abhay Kotecha
- Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, United Kingdom
| | - Eva Perez-Martin
- The Pirbright Institute, Woking, Surrey, GU24 0NF, United Kingdom
| | - Yongjie Harvey
- The Pirbright Institute, Woking, Surrey, GU24 0NF, United Kingdom
| | - Fuquan Zhang
- The Pirbright Institute, Woking, Surrey, GU24 0NF, United Kingdom
| | - Serban L Ilca
- Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, United Kingdom
| | - Elizabeth E Fry
- Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, United Kingdom
| | - Ben Jackson
- The Pirbright Institute, Woking, Surrey, GU24 0NF, United Kingdom
| | - Francois Maree
- Transboundary Animal Disease Programme, ARC-Onderstepoort Veterinary Institute, Private Bag X05, Onderstepoort, 0110, South Africa
| | - Katherine Scott
- Transboundary Animal Disease Programme, ARC-Onderstepoort Veterinary Institute, Private Bag X05, Onderstepoort, 0110, South Africa
| | - Corey W Hecksel
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK
| | - Michiel M Harmsen
- Wageningen Bioveterinary Research, Division Virology, P.O. Box 65, 8200 AB, Lelystad, The Netherlands
| | - Valérie Mioulet
- The Pirbright Institute, Woking, Surrey, GU24 0NF, United Kingdom
| | - Britta Wood
- The Pirbright Institute, Woking, Surrey, GU24 0NF, United Kingdom
| | - Nick Juleff
- The Pirbright Institute, Woking, Surrey, GU24 0NF, United Kingdom
| | - David I Stuart
- Division of Structural Biology, Wellcome Trust Centre for Human Genetics, University of Oxford, Oxford, OX3 7BN, United Kingdom
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 0DE, UK
| | - Bryan Charleston
- The Pirbright Institute, Woking, Surrey, GU24 0NF, United Kingdom
| | - Julian Seago
- The Pirbright Institute, Woking, Surrey, GU24 0NF, United Kingdom.
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8
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Evaluation of immune responses of stabilised SAT2 antigens of foot-and-mouth disease in cattle. Vaccine 2017; 35:5426-5433. [DOI: 10.1016/j.vaccine.2017.02.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 12/01/2016] [Accepted: 02/01/2017] [Indexed: 11/20/2022]
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9
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Rapid Engineering of Foot-and-Mouth Disease Vaccine and Challenge Viruses. J Virol 2017; 91:JVI.00155-17. [PMID: 28566375 PMCID: PMC5533925 DOI: 10.1128/jvi.00155-17] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Accepted: 05/09/2017] [Indexed: 11/20/2022] Open
Abstract
There are seven antigenically distinct serotypes of foot-and-mouth disease virus (FMDV), each of which has intratypic variants. In the present study, we have developed methods to efficiently generate promising vaccines against seven serotypes or subtypes. The capsid-encoding gene (P1) of the vaccine strain O1/Manisa/Turkey/69 was replaced with the amplified or synthetic genes from the O, A, Asia1, C, SAT1, SAT2, and SAT3 serotypes. Viruses of the seven serotype were rescued successfully. Each chimeric FMDV with a replacement of P1 showed serotype-specific antigenicity and varied in terms of pathogenesis in pigs and mice. Vaccination of pigs with an experimental trivalent vaccine containing the inactivated recombinants based on the main serotypes O, A, and Asia1 effectively protected them from virus challenge. This technology could be a potential strategy for a customized vaccine with challenge tools to protect against epizootic disease caused by specific serotypes or subtypes of FMDV.IMPORTANCE Foot-and-mouth disease (FMD) virus (FMDV) causes significant economic losses. For vaccine preparation, the selection of vaccine strains was complicated by high antigenic variation. In the present study, we suggested an effective strategy to rapidly prepare and evaluate mass-produced customized vaccines against epidemic strains. The P1 gene encoding the structural proteins of the well-known vaccine virus was replaced by the synthetic or amplified genes of viruses of seven representative serotypes. These chimeric viruses generally replicated readily in cell culture and had a particle size similar to that of the original vaccine strain. Their antigenicity mirrored that of the original serotype from which their P1 gene was derived. Animal infection experiments revealed that the recombinants varied in terms of pathogenicity. This strategy will be a useful tool for rapidly generating customized FMD vaccines or challenge viruses for all serotypes, especially for FMD-free countries, which have prohibited the import of FMDVs.
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10
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Scott KA, Kotecha A, Seago J, Ren J, Fry EE, Stuart DI, Charleston B, Maree FF. SAT2 Foot-and-Mouth Disease Virus Structurally Modified for Increased Thermostability. J Virol 2017; 91:e02312-16. [PMID: 28298597 PMCID: PMC5411616 DOI: 10.1128/jvi.02312-16] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 03/06/2017] [Indexed: 11/20/2022] Open
Abstract
Foot-and-mouth disease virus (FMDV), particularly strains of the O and SAT serotypes, is notoriously unstable. Consequently, vaccines derived from heat-labile SAT viruses have been linked to the induction of immunity with a poor duration and hence require more frequent vaccinations to ensure protection. In silico calculations predicted residue substitutions that would increase interactions at the interpentamer interface, supporting increased stability. We assessed the stability of the 18 recombinant mutant viruses in regard to their growth kinetics, antigenicity, plaque morphology, genetic stability, and temperature, ionic, and pH stability by using Thermofluor and inactivation assays in order to evaluate potential SAT2 vaccine candidates with improved stability. The most stable mutant for temperature and pH stability was the S2093Y single mutant, while other promising mutants were the E3198A, L2094V, and S2093H single mutants and the F2062Y-H2087M-H3143V triple mutant. Although the S2093Y mutant had the greatest stability, it exhibited smaller plaques, a reduced growth rate, a change in monoclonal antibody footprint, and poor genetic stability properties compared to those of the wild-type virus. However, these factors affecting production can be overcome. The addition of 1 M NaCl was found to further increase the stability of the SAT2 panel of viruses. The S2093Y and S2093H mutants were selected for future use in stabilizing SAT2 vaccines.IMPORTANCE Foot-and-mouth disease virus (FMDV) causes a highly contagious acute vesicular disease in cloven-hoofed livestock and wildlife. The control of the disease by vaccination is essential, especially at livestock-wildlife interfaces. The instability of some serotypes, such as SAT2, affects the quality of vaccines and therefore the duration of immunity. We have shown that we can improve the stability of SAT2 viruses by mutating residues at the capsid interface through predictive modeling. This is an important finding for the potential use of such mutants in improving the stability of SAT2 vaccines in countries where FMD is endemic, which rely heavily on the maintenance of the cold chain, with potential improvement to the duration of immune responses.
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Affiliation(s)
- Katherine A Scott
- Transboundary Animal Disease Programme, ARC-Onderstepoort Veterinary Institute, Onderstepoort, South Africa
- Department of Veterinary Tropical Diseases, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, South Africa
| | - Abhay Kotecha
- Division of Structural Biology, University of Oxford, Headington, Oxford, United Kingdom
| | - Julian Seago
- The Pirbright Institute, Pirbright, Woking, United Kingdom
| | - Jingshan Ren
- Division of Structural Biology, University of Oxford, Headington, Oxford, United Kingdom
| | - Elizabeth E Fry
- Division of Structural Biology, University of Oxford, Headington, Oxford, United Kingdom
| | - David I Stuart
- Division of Structural Biology, University of Oxford, Headington, Oxford, United Kingdom
- Life Science Division, Diamond Light Source, Harwell Science and Innovation Campus, Didcot, United Kingdom
| | | | - Francois F Maree
- Transboundary Animal Disease Programme, ARC-Onderstepoort Veterinary Institute, Onderstepoort, South Africa
- Department of Microbiology and Plant Pathology, Faculty of Agricultural and Natural Sciences, University of Pretoria, Pretoria, South Africa
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11
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Nishi T, Onozato H, Ohashi S, Fukai K, Yamada M, Morioka K, Kanno T. Construction and characterization of a full-length infectious cDNA clone of foot-and-mouth disease virus strain O/JPN/2010 isolated in Japan in 2010. Res Vet Sci 2016; 106:165-9. [PMID: 27234555 DOI: 10.1016/j.rvsc.2016.03.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 02/22/2016] [Accepted: 03/28/2016] [Indexed: 10/22/2022]
Abstract
A full-length infectious cDNA clone of the genome of a foot-and-mouth disease virus isolated from the 2010 epidemic in Japan was constructed and designated pSVL-f02. Transfection of Cos-7 or IBRS-2 cells with this clone allowed the recovery of infectious virus. The recovered virus had the same in vitro characterization as the parental virus with regard to antigenicity in neutralization and indirect immunofluorescence tests, plaque size and one-step growth. Pigs were experimentally infected with the parental virus or the recombinant virus recovered from pSVL-f02 transfected cells. There were no significant differences in clinical signs or antibody responses between the two groups, and virus isolation and viral RNA detection from clinical samples were similar. Virus recovered from transfected cells therefore retained the in vitro characteristics and the in vivo pathogenicity of their parental strain. This cDNA clone should be a valuable tool to analyze determinants of pathogenicity and mechanisms of virus replication, and to develop genetically engineered vaccines against foot-and-mouth disease virus.
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Affiliation(s)
- Tatsuya Nishi
- Exotic Disease Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, 6-20-1, Josui-honcho, Kodaira, Tokyo 187-0022, Japan
| | - Hiroyuki Onozato
- Exotic Disease Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, 6-20-1, Josui-honcho, Kodaira, Tokyo 187-0022, Japan
| | - Seiichi Ohashi
- Exotic Disease Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, 6-20-1, Josui-honcho, Kodaira, Tokyo 187-0022, Japan
| | - Katsuhiko Fukai
- Exotic Disease Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, 6-20-1, Josui-honcho, Kodaira, Tokyo 187-0022, Japan
| | - Manabu Yamada
- Exotic Disease Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, 6-20-1, Josui-honcho, Kodaira, Tokyo 187-0022, Japan
| | - Kazuki Morioka
- Exotic Disease Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, 6-20-1, Josui-honcho, Kodaira, Tokyo 187-0022, Japan
| | - Toru Kanno
- Exotic Disease Research Division, National Institute of Animal Health, National Agriculture and Food Research Organization, 6-20-1, Josui-honcho, Kodaira, Tokyo 187-0022, Japan.
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12
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Kotecha A, Seago J, Scott K, Burman A, Loureiro S, Ren J, Porta C, Ginn HM, Jackson T, Perez-Martin E, Siebert CA, Paul G, Huiskonen JT, Jones IM, Esnouf RM, Fry EE, Maree FF, Charleston B, Stuart DI. Structure-based energetics of protein interfaces guides foot-and-mouth disease virus vaccine design. Nat Struct Mol Biol 2015; 22:788-94. [PMID: 26389739 PMCID: PMC5985953 DOI: 10.1038/nsmb.3096] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Accepted: 08/26/2015] [Indexed: 11/08/2022]
Abstract
Virus capsids are primed for disassembly, yet capsid integrity is key to generating a protective immune response. Foot-and-mouth disease virus (FMDV) capsids comprise identical pentameric protein subunits held together by tenuous noncovalent interactions and are often unstable. Chemically inactivated or recombinant empty capsids, which could form the basis of future vaccines, are even less stable than live virus. Here we devised a computational method to assess the relative stability of protein-protein interfaces and used it to design improved candidate vaccines for two poorly stable, but globally important, serotypes of FMDV: O and SAT2. We used a restrained molecular dynamics strategy to rank mutations predicted to strengthen the pentamer interfaces and applied the results to produce stabilized capsids. Structural analyses and stability assays confirmed the predictions, and vaccinated animals generated improved neutralizing-antibody responses to stabilized particles compared to parental viruses and wild-type capsids.
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Affiliation(s)
- Abhay Kotecha
- Division of Structural Biology, University of Oxford, Oxford, UK
| | | | - Katherine Scott
- Transboundary Animal Disease Programme, Agricultural Research Council-Onderstepoort Veterinary Institute, Onderstepoort, South Africa
| | | | - Silvia Loureiro
- Animal and Microbial Sciences, University of Reading, Reading, UK
| | - Jingshan Ren
- Division of Structural Biology, University of Oxford, Oxford, UK
| | - Claudine Porta
- Division of Structural Biology, University of Oxford, Oxford, UK
- The Pirbright Institute, Pirbright, UK
| | - Helen M. Ginn
- Division of Structural Biology, University of Oxford, Oxford, UK
| | | | | | | | - Guntram Paul
- Merck Sharp & Dohme Animal Health, Cologne, Germany
| | | | - Ian M. Jones
- Animal and Microbial Sciences, University of Reading, Reading, UK
| | - Robert M. Esnouf
- Division of Structural Biology, University of Oxford, Oxford, UK
| | - Elizabeth E. Fry
- Division of Structural Biology, University of Oxford, Oxford, UK
| | - Francois F. Maree
- Transboundary Animal Disease Programme, Agricultural Research Council-Onderstepoort Veterinary Institute, Onderstepoort, South Africa
- Department of Microbiology and Plant Pathology, University of Pretoria, Pretoria, South Africa
| | | | - David I. Stuart
- Division of Structural Biology, University of Oxford, Oxford, UK
- Life Science Division, Diamond Light Source, Didcot, UK
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13
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Zheng H, Lian K, Yang F, Jin Y, Zhu Z, Guo J, Cao W, Liu H, He J, Zhang K, Li D, Liu X. Cross-protective efficacy of engineering serotype A foot-and-mouth disease virus vaccine against the two pandemic strains in swine. Vaccine 2015; 33:5772-5778. [PMID: 26431990 DOI: 10.1016/j.vaccine.2015.09.055] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2015] [Revised: 09/15/2015] [Accepted: 09/16/2015] [Indexed: 10/23/2022]
Abstract
Foot-and-mouth disease (FMD) is a highly contagious vesicular disease that affects domestic and wild cloven-hoofed animals worldwide. Recently, a series of outbreaks of type A FMDV occurred in Southeast Asian countries, China, the Russia Federation, Mongolia, Kazakhstan and South Korea. The FMD virus (A/GDMM/CHA/2013) from China's Guangdong province (2013) is representative of those responsible for the latest epidemic, and has low amino acid identity (93.9%) in VP1 protein with the epidemic strain A/WH/CHA/09 from Wuhan, China in 2009. Both of isolates belong to the Sea-97 genotype of ASIA topotype. Therefore, the application of a new vaccine strain with cross-protective efficacy is of fundamental importance to control the spread of the two described pandemic strains. A chimeric strain rA/P1-FMDV constructed by our lab previously through replacing the P1 gene in the vaccine strain O/CHA/99 with that from the epidemic stain A/WH/CHA/09, has been demonstrated to exhibit good growth characteristics in culture, and the rA/P1-FMDV inactivated vaccine can provide protection against epidemic strain A/WH/CHA/09 in cattle. However, it is still unclear whether the vaccine produces efficient protection against the new pandemic strain (A/GDMM/CHA/2013). Here, vaccine matching and pig 50% protective dose (PD50) tests were performed to assess the vaccine potency. The vaccine matching test showed cross-reactivity of sera from full dose vaccine vaccinated pigs with A/WH/CHA/09 and A/GDMM/CHA/2013 isolates, with average r1 values of 0.94±0.12 and 0.68±0.06 (r1≥0.3), which indicates that the rA/P1-FMDV vaccine is likely to confer good cross-protection against the two isolates. When challenged with two pandemic isolates A/WH/CHA/09 and A/GDMM/CHA/2013 strain, the vaccine achieved 12.51 PD50 and 10.05 PD50 per dose (2.8μg), respectively. The results indicated that the rA/P1-FMDV inactivated vaccine could protect pigs against both A/WH/CHA/09 and A/GDMM/CHA/2013 pandemic isolates.
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Affiliation(s)
- Haixue Zheng
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China.
| | - Kaiqi Lian
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Fan Yang
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Ye Jin
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Zixiang Zhu
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Jianhong Guo
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Weijun Cao
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Huanan Liu
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Jijun He
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Keshan Zhang
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Dan Li
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Xiangtao Liu
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China.
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14
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Biswal JK, Subramaniam S, Sharma GK, Mahajan S, Ranjan R, Misri J, Pattnaik B. Megaprimer-mediated capsid swapping for the construction of custom-engineered chimeric foot-and-mouth disease virus. Virus Genes 2015; 51:225-33. [PMID: 26303897 DOI: 10.1007/s11262-015-1237-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 08/14/2015] [Indexed: 10/23/2022]
Abstract
Foot-and-mouth disease (FMD) is a highly contagious, economically important disease of transboundary importance. Regular vaccination with chemically inactivated FMD vaccine is the major means of controlling the disease in endemic countries like India. However, the selection of appropriate candidate vaccine strain and its adaptation in cell culture to yield high titer of virus is a cumbersome process. An attractive approach to circumvent this tedious process is to replace the capsid coding sequence of an infectious full-genome length cDNA clone of a good vaccine strain with those of appropriate field strain, to produce custom-made chimeric FMD virus (FMDV). Nevertheless, the construction of chimeric virus can be difficult if the necessary endonuclease restriction sites are unavailable or unsuitable for swapping of the capsid sequence. Here we described an efficient method based on megaprimer-mediated capsid swapping for the construction of chimeric FMDV cDNA clones. Using FMDV vaccine strain A IND 40/2000 infectious clone (pA(40/2000)) as a donor plasmid, we exchanged the capsid sequence of pA(40/2000) with that of the viruses belonging to serotypes O (n = 5), A (n = 2), and Asia 1 (n = 2), and subsequently generated infectious FMDV from their respective chimeric cDNA clones. The chimeric viruses exhibited comparable infection kinetics, plaque phenotypes, antigenic profiles, and virion stability to the parental viruses. The results from this study suggest that megaprimer-based reverse genetics technology is useful for engineering chimeric vaccine strains for use in the control and prevention of FMD in endemic countries.
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Affiliation(s)
- Jitendra K Biswal
- ICAR-Project Directorate on Foot-and-mouth Disease, Mukteswar, Nainital, 263138, Uttarakhand, India.
| | - Saravanan Subramaniam
- ICAR-Project Directorate on Foot-and-mouth Disease, Mukteswar, Nainital, 263138, Uttarakhand, India
| | - Gaurav K Sharma
- ICAR-Project Directorate on Foot-and-mouth Disease, Mukteswar, Nainital, 263138, Uttarakhand, India
| | - Sonalika Mahajan
- ICAR-Project Directorate on Foot-and-mouth Disease, Mukteswar, Nainital, 263138, Uttarakhand, India
| | - Rajeev Ranjan
- ICAR-Project Directorate on Foot-and-mouth Disease, Mukteswar, Nainital, 263138, Uttarakhand, India
| | - Jyoti Misri
- Indian Council of Agricultural Research, Krishi Bhavan, New Delhi, 110 001, India
| | - Bramhadev Pattnaik
- ICAR-Project Directorate on Foot-and-mouth Disease, Mukteswar, Nainital, 263138, Uttarakhand, India.
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15
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Lian K, Yang F, Zhu Z, Cao W, Jin Y, Li D, Zhang K, Guo J, Zheng H, Liu X. Recovery of infectious type Asia1 foot-and-mouth disease virus from suckling mice directly inoculated with an RNA polymerase I/II-driven unidirectional transcription plasmid. Virus Res 2015; 208:73-81. [PMID: 26091821 DOI: 10.1016/j.virusres.2015.06.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2015] [Revised: 05/18/2015] [Accepted: 06/05/2015] [Indexed: 11/15/2022]
Abstract
We developed an RNA polymerase (pol) I- and II-driven plasmid-based reverse genetics system to rescue infectious foot-and-mouth disease virus (FMDV) from cloned cDNA. In this plasmid-based transfection, the full-length viral cDNA was flanked by hammerhead ribozyme (HamRz) and hepatitis delta ribozyme (HdvRz) sequences, which were arranged downstream of the two promoters (cytomegalovirus (CMV) and pol I promoter) and upstream of the terminators and polyadenylation signal, respectively. The utility of this method was demonstrated by the recovery of FMDV Asia1 HN/CHA/06 in BHK-21 cells transfected with cDNA plasmids. Furthermore, infectious FMDV Asia1 HN/CHA/06 could be rescued from suckling mice directly inoculated with cDNA plasmids. Thus, this reverse genetics system can be applied to fundamental research and vaccine studies, most notably to rescue those viruses for which there is currently an absence of a suitable cell culture system.
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Affiliation(s)
- Kaiqi Lian
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Fan Yang
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Zixiang Zhu
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Weijun Cao
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Ye Jin
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Dan Li
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Keshan Zhang
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Jianhong Guo
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
| | - Haixue Zheng
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China.
| | - Xiangtao Liu
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Diseases Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
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16
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Maree FF, Nsamba P, Mutowembwa P, Rotherham LS, Esterhuysen J, Scott K. Intra-serotype SAT2 chimeric foot-and-mouth disease vaccine protects cattle against FMDV challenge. Vaccine 2015; 33:2909-16. [DOI: 10.1016/j.vaccine.2015.04.058] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Revised: 04/10/2015] [Accepted: 04/15/2015] [Indexed: 10/23/2022]
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17
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Bari FD, Parida S, Asfor AS, Haydon DT, Reeve R, Paton DJ, Mahapatra M. Prediction and characterization of novel epitopes of serotype A foot-and-mouth disease viruses circulating in East Africa using site-directed mutagenesis. J Gen Virol 2015; 96:1033-1041. [PMID: 25614587 PMCID: PMC4631058 DOI: 10.1099/vir.0.000051] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Accepted: 01/12/2015] [Indexed: 02/06/2023] Open
Abstract
Epitopes on the surface of the foot-and-mouth disease virus (FMDV) capsid have been identified by monoclonal antibody (mAb) escape mutant studies leading to the designation of four antigenic sites in serotype A FMDV. Previous work focused on viruses isolated mainly from Asia, Europe and Latin America. In this study we report on the prediction of epitopes in African serotype A FMDVs and testing of selected epitopes using reverse genetics. Twenty-four capsid amino acid residues were predicted to be of antigenic significance by analysing the capsid sequences (n = 56) using in silico methods, and six residues by correlating capsid sequence with serum-virus neutralization data. The predicted residues were distributed on the surface-exposed capsid regions, VP1-VP3. The significance of residue changes at eight of the predicted epitopes was tested by site-directed mutagenesis using a cDNA clone resulting in the generation of 12 mutant viruses involving seven sites. The effect of the amino acid substitutions on the antigenic nature of the virus was assessed by virus neutralization (VN) test. Mutations at four different positions, namely VP1-43, VP1-45, VP2-191 and VP3-132, led to significant reduction in VN titre (P value = 0.05, 0.05, 0.001 and 0.05, respectively). This is the first time, to our knowledge, that the antigenic regions encompassing amino acids VP1-43 to -45 (equivalent to antigenic site 3 in serotype O), VP2-191 and VP3-132 have been predicted as epitopes and evaluated serologically for serotype A FMDVs. This identifies novel capsid epitopes of recently circulating serotype A FMDVs in East Africa.
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Affiliation(s)
- Fufa Dawo Bari
- The Pirbright Institute, Ash Road, Woking, Surrey, GU24 0NF, UK
| | - Satya Parida
- The Pirbright Institute, Ash Road, Woking, Surrey, GU24 0NF, UK
| | - Amin S. Asfor
- The Pirbright Institute, Ash Road, Woking, Surrey, GU24 0NF, UK
| | - Daniel T. Haydon
- Boyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, G12 8QQ, UK
| | - Richard Reeve
- The Pirbright Institute, Ash Road, Woking, Surrey, GU24 0NF, UK
- Boyd Orr Centre for Population and Ecosystem Health, Institute of Biodiversity, Animal Health and Comparative Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, G12 8QQ, UK
| | - David J. Paton
- The Pirbright Institute, Ash Road, Woking, Surrey, GU24 0NF, UK
| | - Mana Mahapatra
- The Pirbright Institute, Ash Road, Woking, Surrey, GU24 0NF, UK
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Biswal JK, Mohapatra JK, Bisht P, Subramaniam S, Sanyal A, Pattnaik B. A positively charged lysine residue at VP2 131 position allows for the enhanced adaptability of foot-and-mouth disease virus serotype A in BHK-21 cells. Biologicals 2014; 43:71-8. [PMID: 25439090 DOI: 10.1016/j.biologicals.2014.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 05/13/2014] [Accepted: 07/06/2014] [Indexed: 11/28/2022] Open
Abstract
Field outbreak strains of foot-and-mouth disease virus (FMDV) infect host cells through certain Arg-Gly-Asp (RGD) dependent integrin family of cellular receptors. In contrast, FMDV adapted in non-host cell cultures are reported to acquire the ability to infect cells via heparin sulphate (HS) or other unidentified cell surface molecules. It has been reported that during the serial passage of FMDV serotype A in BHK-21 cell culture, VP2 E131K (E2131K) substitution was fixed within the heparin sulphate binding site. The fixation of positively charged residue at position VP2 131 of serotype A is considered to associate with the ability to utilise alternative receptor. In this study, an infectious full-length cDNA clone for Indian FMDV vaccine strain A IND 40/2000 was constructed. Through site-directed mutagenesis on the cDNA clone, recombinant virus containing positive charged amino acid residue at position VP2 131 was rescued. The recombinant mutated virus was shown to have specific and strong affinity for HS and demonstrated an enhanced infectivity in BHK-21 cell line. The introduction of lysine residue at VP2 131 position that allows cell culture adaptation of FMDV serotype A could be exploited for the generation of vaccine seed stocks with improved growth properties in BHK-21 cell line.
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Affiliation(s)
- Jitendra K Biswal
- Project Directorate on Foot-and-Mouth Disease (ICAR), Mukteswar, 263138 Nainital, Uttarakhand, India
| | - Jajati K Mohapatra
- Project Directorate on Foot-and-Mouth Disease (ICAR), Mukteswar, 263138 Nainital, Uttarakhand, India
| | - Punam Bisht
- Project Directorate on Foot-and-Mouth Disease (ICAR), Mukteswar, 263138 Nainital, Uttarakhand, India
| | - Saravanan Subramaniam
- Project Directorate on Foot-and-Mouth Disease (ICAR), Mukteswar, 263138 Nainital, Uttarakhand, India
| | - Aniket Sanyal
- Project Directorate on Foot-and-Mouth Disease (ICAR), Mukteswar, 263138 Nainital, Uttarakhand, India
| | - Bramhadev Pattnaik
- Project Directorate on Foot-and-Mouth Disease (ICAR), Mukteswar, 263138 Nainital, Uttarakhand, India.
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Maree FF, Kasanga CJ, Scott KA, Opperman PA, Melanie C, Sangula AK, Raphael S, Yona S, Wambura PN, King DP, Paton DJ, Rweyemamu MM. Challenges and prospects for the control of foot-and-mouth disease: an African perspective. VETERINARY MEDICINE-RESEARCH AND REPORTS 2014; 5:119-138. [PMID: 32670853 PMCID: PMC7337166 DOI: 10.2147/vmrr.s62607] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2014] [Accepted: 04/23/2014] [Indexed: 11/23/2022]
Abstract
The epidemiology of foot-and-mouth disease (FMD) in Africa is unique in the sense that six of the seven serotypes of FMD viruses (Southern African Territories [SAT] 1, SAT2, SAT3, A, O, and C), with the exception of Asia-1, have occurred in the last decade. Due to underreporting of FMD, the current strains circulating throughout sub-Saharan Africa are in many cases unknown. For SAT1, SAT2, and serotype A viruses, the genetic diversity is reflected in antigenic variation, and indications are that vaccine strains may be needed for each topotype. This has serious implications for control using vaccines and for choice of strains to include in regional antigen banks. The epidemiology is further complicated by the fact that SAT1, SAT2, and SAT3 viruses are maintained and spread by wildlife, persistently infecting African buffalo in particular. Although the precise mechanism of transmission of FMD from buffalo to cattle is not well understood, it is facilitated by direct contact between these two species. Once cattle are infected they may maintain SAT infections without the further involvement of buffalo. No single strategy for control of FMD in Africa is applicable. Decision on the most effective regional control strategy should focus on an ecosystem approach, identification of primary endemic areas, animal husbandry practices, climate, and animal movement. Within each ecosystem, human behavior could be integrated in disease control planning. Different regions in sub-Saharan Africa are at different developmental stages and are thus facing unique challenges and priorities in terms of veterinary disease control. Many science-based options targeting improved vaccinology, diagnostics, and other control measures have been described. This review therefore aims to emphasize, on one hand, the progress that has been achieved in the development of new technologies, including research towards improved tailored vaccines, appropriate vaccine strain selection, vaccine potency, and diagnostics, and how it relates to the conditions in Africa. On the other hand, we focus on the unique epidemiological, ecological, livestock farming and marketing, socioeconomic, and governance issues that constrain effective FMD control. Any such new technologies should have the availability of safe livestock products for trade as the ultimate goal.
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Affiliation(s)
- Francois F Maree
- Transboundary Animal Diseases Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort, Pretoria, South Africa.,Department of Microbiology and Plant Pathology, Faculty of Agricultural and Natural Sciences, University of Pretoria, Pretoria, South Africa
| | - Christopher J Kasanga
- Southern African Centre for Infectious Diseases Surveillance, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Katherine A Scott
- Transboundary Animal Diseases Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort, Pretoria, South Africa
| | - Pamela A Opperman
- Transboundary Animal Diseases Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort, Pretoria, South Africa.,Department of Microbiology and Plant Pathology, Faculty of Agricultural and Natural Sciences, University of Pretoria, Pretoria, South Africa
| | - Chitray Melanie
- Transboundary Animal Diseases Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort, Pretoria, South Africa.,Department of Microbiology and Plant Pathology, Faculty of Agricultural and Natural Sciences, University of Pretoria, Pretoria, South Africa
| | | | - Sallu Raphael
- Southern African Centre for Infectious Diseases Surveillance, Sokoine University of Agriculture, Morogoro, Tanzania
| | - Sinkala Yona
- Department of Disease Control, School of Veterinary Medicine, University of Zambia, Lusaka, Zambia
| | - Philemon N Wambura
- Southern African Centre for Infectious Diseases Surveillance, Sokoine University of Agriculture, Morogoro, Tanzania
| | | | | | - Mark M Rweyemamu
- Southern African Centre for Infectious Diseases Surveillance, Sokoine University of Agriculture, Morogoro, Tanzania
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Determining the epitope dominance on the capsid of a serotype SAT2 foot-and-mouth disease virus by mutational analyses. J Virol 2014; 88:8307-18. [PMID: 24829347 DOI: 10.1128/jvi.00470-14] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED Monoclonal-antibody (MAb)-resistant mutants were used to map antigenic sites on foot-and-mouth disease virus (FMDV), which resulted in the identification of neutralizing epitopes in the flexible βG-βH loop in VP1. For FMDV SAT2 viruses, studies have shown that at least two antigenic sites exist. By use of an infectious SAT2 cDNA clone, 10 structurally exposed and highly variable loops were identified as putative antigenic sites on the VP1, VP2, and VP3 capsid proteins of SAT2/Zimbabwe (ZIM)/7/83 (topotype II) and replaced with the corresponding regions of SAT2/Kruger National Park (KNP)/19/89 (topotype I). Virus neutralization assays using convalescent-phase antisera raised against the parental virus, SAT2/ZIM/7/83, indicated that the mutant virus containing the TQQS-to-ETPV mutation in the N-terminal part of the βG-βH loop of VP1 showed not only a significant increase in the neutralization titer but also an increase in the index of avidity to the convalescent-phase antisera. Furthermore, antigenic profiling of the epitope-replaced and parental viruses with nonneutralizing SAT2-specific MAbs led to the identification of two nonneutralizing antigenic regions. Both regions were mapped to incorporate residues 71 to 72 of VP2 as the major contact point. The binding footprint of one of the antigenic regions encompasses residues 71 to 72 and 133 to 134 of VP2 and residues 48 to 50 of VP1, and the second antigenic region encompasses residues 71 to 72 and 133 to 134 of VP2 and residues 84 to 86 and 109 to 11 of VP1. This is the first time that antigenic regions encompassing residues 71 to 72 of VP2 have been identified on the capsid of a SAT2 FMDV. IMPORTANCE Monoclonal-antibody-resistant mutants have traditionally been used to map antigenic sites on foot-and-mouth disease virus (FMDV). However, for SAT2-type viruses, which are responsible for most of the FMD outbreaks in Africa and are the most varied of all seven serotypes, only two antigenic sites have been identified. We have followed a unique approach using an infectious SAT2 cDNA genome-length clone. Ten structurally surface-exposed, highly varied loops were identified as putative antigenic sites on the VP1, VP2, and VP3 capsid proteins of the SAT2/ZIM/7/83 virus. These regions were replaced with the corresponding regions of an antigenically disparate virus, SAT2/KNP/19/89. Antigenic profiling of the epitope-replaced and parental viruses with SAT2-specific MAbs led to the identification of two unique antibody-binding footprints on the SAT2 capsid. In this report, evidence for the structural engineering of antigenic sites of a SAT2 capsid to broaden cross-reactivity with antisera is provided.
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Mohapatra JK, Pandey LK, Pattnaik B. RNA structure disrupting G320-T transversion within the short fragment of the 5′ untranslated region prevents rescue of infectious foot-and-mouth disease virus. J Virol Methods 2014; 196:100-3. [DOI: 10.1016/j.jviromet.2013.11.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Revised: 11/10/2013] [Accepted: 11/12/2013] [Indexed: 11/28/2022]
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Maree FF, Blignaut B, de Beer TAP, Rieder E. Analysis of SAT type foot-and-mouth disease virus capsid proteins and the identification of putative amino acid residues affecting virus stability. PLoS One 2013; 8:e61612. [PMID: 23717387 PMCID: PMC3661562 DOI: 10.1371/journal.pone.0061612] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 03/11/2013] [Indexed: 02/02/2023] Open
Abstract
Foot-and-mouth disease virus (FMDV) initiates infection by adhering to integrin receptors on target cells, followed by cell entry and disassembly of the virion through acidification within endosomes. Mild heating of the virions also leads to irreversible dissociation into pentamers, a characteristic linked to reduced vaccine efficacy. In this study, the structural stability of intra- and inter-serotype chimeric SAT2 and SAT3 virus particles to various conditions including low pH, mild temperatures or high ionic strength, was compared. Our results demonstrated that while both the SAT2 and SAT3 infectious capsids displayed different sensitivities in a series of low pH buffers, their stability profiles were comparable at high temperatures or high ionic strength conditions. Recombinant vSAT2 and intra-serotype chimeric viruses were used to map the amino acid differences in the capsid proteins of viruses with disparate low pH stabilities. Four His residues at the inter-pentamer interface were identified that change protonation states at pH 6.0. Of these, the H145 of VP3 appears to be involved in interactions with A141 in VP3 and K63 in VP2, and may be involved in orientating H142 of VP3 for interaction at the inter-pentamer interfaces.
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Affiliation(s)
- Francois F Maree
- Transboundary Animal Diseases Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort, Pretoria, South Africa.
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Joshi R, Chandrasekar S, Paul S, Chokkalingam AK, Saravanan T, Ahmad K, Dechamma H, Reddy G, Gopinath S, Das D, Shaila M, Bharath G, Suryanarayana V. Growth kinetics and immune response of chimeric foot-and-mouth disease virus serotype ‘O’ produced through replication competent mini genome of serotype Asia 1, 63/72, in BHK cell lines. Virus Res 2013; 173:299-305. [DOI: 10.1016/j.virusres.2013.01.018] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2012] [Revised: 01/22/2013] [Accepted: 01/22/2013] [Indexed: 11/26/2022]
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Engineering foot-and-mouth disease viruses with improved growth properties for vaccine development. PLoS One 2013; 8:e55228. [PMID: 23372840 PMCID: PMC3555929 DOI: 10.1371/journal.pone.0055228] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2011] [Accepted: 12/21/2012] [Indexed: 11/23/2022] Open
Abstract
Background No licensed vaccine is currently available against serotype A foot-and-mouth disease (FMD) in China, despite the isolation of A/WH/CHA/09 in 2009, partly because this strain does not replicate well in baby hamster kidney (BHK) cells. Methodology/Principal Findings A novel plasmid-based reverse genetics system was used to construct a chimeric strain by replacing the P1 gene in the vaccine strain O/CHA/99 with that from the epidemic stain A/WH/CHA/09. The chimeric virus displayed growth kinetics similar to those of O/CHA/99 and was selected for use as a candidate vaccine strain after 12 passages in BHK cells. Cattle were vaccinated with the inactivated vaccine and humoral immune responses were induced in most of the animals on day 7. A challenge infection with A/WH/CHA/09 on day 28 indicated that the group given a 4-µg dose was fully protected and neither developed viremia nor seroconverted to a 3ABC antigen. Conclusions/Significance Our data demonstrate that the chimeric virus not only propagates well in BHK cells and has excellent antigenic matching against serotype A FMD, but is also a potential marker vaccine to distinguish infection from vaccination. These results suggest that reverse genetics technology is a useful tool for engineering vaccines for the prevention and control of FMD.
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Genome sequences of SAT 2 foot-and-mouth disease viruses from Egypt and Palestinian Autonomous Territories (Gaza Strip). J Virol 2012; 86:8901-2. [PMID: 22843860 DOI: 10.1128/jvi.01231-12] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Two foot-and-mouth disease virus (FMDV) genome sequences have been determined for isolates collected from recent field outbreaks in North Africa (Egypt) and the Middle East (Palestinian Autonomous Territories). These data represent the first examples of complete genomic sequences for the FMDV SAT 2 topotype VII, which is thought to be endemic in countries immediately to the south of the Sahara desert. Further studies are now urgently required to provide insights into the epidemiological links between these outbreaks and to define the pathogenicity of this emerging lineage.
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26
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Opperman PA, Maree FF, Van Wyngaardt W, Vosloo W, Theron J. Mapping of antigenic determinants on a SAT2 foot-and-mouth disease virus using chicken single-chain antibody fragments. Virus Res 2012; 167:370-9. [PMID: 22698877 DOI: 10.1016/j.virusres.2012.05.026] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 05/28/2012] [Accepted: 05/31/2012] [Indexed: 11/28/2022]
Abstract
Recombinant single-chain variable fragments (scFvs) of antibodies make it possible to localize antigenic and immunogenic determinants, identify protective epitopes and can be exploited for the design of improved diagnostic tests and vaccines. A neutralizing epitope, as well as other potential antigenic sites of a SAT2 foot-and-mouth disease virus (FMDV) were identified using phage-displayed scFvs. Three unique ZIM/7/83-specific scFvs, designated scFv1, scFv2 and scFv3, were isolated. Further characterization of these scFvs revealed that only scFv2 was capable of neutralizing the ZIM/7/83 virus and was used to generate neutralization-resistant virus variants. Sequence analysis of the P1 region of virus escaping neutralization revealed a residue change from His to Arg at position 159 of the VP1 protein. Residue 159 is not only surface exposed but is also located at the C-terminal base of the G-H loop, a known immunogenic region of FMDV. A synthetic peptide, of which the sequence corresponded to the predicted antigenic site of the VP1 G-H loop of ZIM/7/83, inhibited binding of scFv2 to ZIM/7/83 in a concentration-dependent manner. This region can therefore be considered in the design of SAT2 vaccine seed viruses for the regional control of FMD in Africa.
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Affiliation(s)
- Pamela A Opperman
- Onderstepoort Veterinary Institute, Transboundary Animal Diseases Programme, Private Bag X05, Onderstepoort 0110, South Africa.
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27
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Lohse L, Jackson T, Bøtner A, Belsham GJ. Capsid coding sequences of foot-and-mouth disease viruses are determinants of pathogenicity in pigs. Vet Res 2012; 43:46. [PMID: 22624592 PMCID: PMC3431240 DOI: 10.1186/1297-9716-43-46] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2012] [Accepted: 04/27/2012] [Indexed: 11/10/2022] Open
Abstract
The surface exposed capsid proteins, VP1, VP2 and VP3, of foot-and-mouth disease virus (FMDV) determine its antigenicity and the ability of the virus to interact with host-cell receptors. Hence, modification of these structural proteins may alter the properties of the virus.In the present study we compared the pathogenicity of different FMDVs in young pigs. In total 32 pigs, 7-weeks-old, were exposed to virus, either by direct inoculation or through contact with inoculated pigs, using cell culture adapted (O1K B64), chimeric (O1K/A-TUR and O1K/O-UKG) or field strain (O-UKG/34/2001) viruses. The O1K B64 virus and the two chimeric viruses are identical to each other except for the capsid coding region.Animals exposed to O1K B64 did not exhibit signs of disease, while pigs exposed to each of the other viruses showed typical clinical signs of foot-and-mouth disease (FMD). All pigs infected with the O1K/O-UKG chimera or the field strain (O-UKG/34/2001) developed fulminant disease. Furthermore, 3 of 4 in-contact pigs exposed to the O1K/O-UKG virus died in the acute phase of infection, likely from myocardial infection. However, in the group exposed to the O1K/A-TUR chimeric virus, only 1 pig showed symptoms of disease within the time frame of the experiment (10 days). All pigs that developed clinical disease showed a high level of viral RNA in serum and infected pigs that survived the acute phase of infection developed a serotype specific antibody response. It is concluded that the capsid coding sequences are determinants of FMDV pathogenicity in pigs.
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Affiliation(s)
- Louise Lohse
- National Veterinary Institute, Technical University of Denmark, Lindholm, Kalvehave, DK-4771, Denmark.
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28
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Li P, Bai X, Sun P, Li D, Lu Z, Cao Y, Fu Y, Bao H, Chen Y, Xie B, Liu Z. Evaluation of a genetically modified foot-and-mouth disease virus vaccine candidate generated by reverse genetics. BMC Vet Res 2012; 8:57. [PMID: 22591597 PMCID: PMC3488552 DOI: 10.1186/1746-6148-8-57] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2011] [Accepted: 04/24/2012] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Foot-and-mouth disease (FMD) is the most economically important and highly contagious disease of cloven-hoofed animals worldwide. Control of the disease has been mainly based on large-scale vaccinations with whole-virus inactivated vaccines. In recent years, a series of outbreaks of type O FMD occurred in China (including Chinese Taipei, Chinese Hong Kong) posed a tremendous threat to Chinese animal husbandry. Its causative agent, type O FMDV, has evolved into three topotypes (East-South Asia (ME-SA), Southeast Asia (SEA), Cathay (CHY)) in these regions, which represents an important obstacle to disease control. The available FMD vaccine in China shows generally good protection against ME-SA and SEA topotype viruses infection, but affords insufficient protection against some variants of the CHY topotype. Therefore, the choice of a new vaccine strain is of fundamental importance. RESULTS The present study describes the generation of a full-length infectious cDNA clone of FMDV vaccine strain and a genetically modified virus with some amino acid substitutions in antigenic sites 1, 3, and 4, based on the established infectious clone. The recombinant viruses had similar growth properties to the wild O/HN/CHA/93 virus. All swine immunized with inactivated vaccine prepared from the O/HN/CHA/93 were fully protected from challenge with the viruses of ME-SA and SEA topotypes and partially protected against challenge with the virus of CHY topotype at 28 days post-immunization. In contrast, the swine inoculated with the genetically modified vaccine were completely protected from the infection of viruses of the three topotypes. CONCLUSIONS Some amino acid substitutions in the FMDV vaccine strain genome did not have an effect on the ability of viral replication in vitro. The vaccine prepared from genetically modified FMDV by reverse genetics significantly improved the protective efficacy to the variant of the CHY topotype, compared with the wild O/HN/CHA/93 virus. Thus, the full-length cDNA clone of FMDV can be a useful tool to develop genetically engineered FMDV vaccine candidates to help control porcinophilic FMD epidemics in China.
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Affiliation(s)
- Pinghua Li
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Xingwen Bai
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Pu Sun
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Dong Li
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Zengjun Lu
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Yimei Cao
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Yuanfang Fu
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Huifang Bao
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Yingli Chen
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Baoxia Xie
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
| | - Zaixin Liu
- State Key Laboratory of Veterinary Etiological Biology, National Foot and Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, 730046, Gansu, China
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Maree FF, Blignaut B, Aschenbrenner L, Burrage T, Rieder E. Analysis of SAT1 type foot-and-mouth disease virus capsid proteins: Influence of receptor usage on the properties of virus particles. Virus Res 2011; 155:462-72. [DOI: 10.1016/j.virusres.2010.12.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Revised: 12/06/2010] [Accepted: 12/09/2010] [Indexed: 10/18/2022]
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30
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Bøtner A, Kakker NK, Barbezange C, Berryman S, Jackson T, Belsham GJ. Capsid proteins from field strains of foot-and-mouth disease virus confer a pathogenic phenotype in cattle on an attenuated, cell-culture-adapted virus. J Gen Virol 2011; 92:1141-1151. [PMID: 21270284 DOI: 10.1099/vir.0.029710-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Chimeric foot-and-mouth disease viruses (FMDVs) have been generated from plasmids containing full-length FMDV cDNAs and characterized. The parental virus cDNA was derived from the cell-culture-adapted O1Kaufbeuren B64 (O1K B64) strain. Chimeric viruses, containing capsid coding sequences derived from the O/UKG/34/2001 or A/Turkey 2/2006 field viruses, were constructed using the backbone from the O1K B64 cDNA, and viable viruses (O1K/O-UKG and O1K/A-Tur, respectively) were successfully rescued in each case. These viruses grew well in primary bovine thyroid cells but grew less efficiently in BHK cells than the rescued parental O1K B64 virus. The two chimeric viruses displayed the expected antigenicity in serotype-specific antigen ELISAs. Following inoculation of each virus into cattle, the rescued O1K B64 strain proved to be attenuated whereas, with each chimeric virus, typical clinical signs of foot-and-mouth disease were observed, which then spread to in-contact animals. Thus, the surface-exposed capsid proteins of the O1K B64 strain are responsible for its attenuation in cattle. Consequently, there is no evidence for any adaptation, acquired during cell culture, outside the capsid coding region within the O1K B64 strain that inhibits replication in cattle. These chimeric infectious cDNA plasmids provide a basis for the analysis of FMDV pathogenicity and characterization of receptor utilization in vivo.
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Affiliation(s)
- Anette Bøtner
- National Veterinary Institute, Technical University of Denmark, Lindholm, 4771 Kalvehave, Denmark
| | - Naresh K Kakker
- Institute for Animal Health, Pirbright, Woking, Surrey GU24 0NF, UK
| | - Cyril Barbezange
- National Veterinary Institute, Technical University of Denmark, Lindholm, 4771 Kalvehave, Denmark
| | - Stephen Berryman
- Institute for Animal Health, Pirbright, Woking, Surrey GU24 0NF, UK
| | - Terry Jackson
- Institute for Animal Health, Pirbright, Woking, Surrey GU24 0NF, UK
| | - Graham J Belsham
- National Veterinary Institute, Technical University of Denmark, Lindholm, 4771 Kalvehave, Denmark
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31
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Blignaut B, Visser N, Theron J, Rieder E, Maree FF. Custom-engineered chimeric foot-and-mouth disease vaccine elicits protective immune responses in pigs. J Gen Virol 2010; 92:849-59. [PMID: 21177923 DOI: 10.1099/vir.0.027151-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Chimeric foot-and-mouth disease viruses (FMDV) of which the antigenic properties can be readily manipulated is a potentially powerful approach in the control of foot-and-mouth disease (FMD) in sub-Saharan Africa. FMD vaccine application is complicated by the extensive variability of the South African Territories (SAT) type viruses, which exist as distinct genetic and antigenic variants in different geographical regions. A cross-serotype chimeric virus, vKNP/SAT2, was engineered by replacing the external capsid-encoding region (1B-1D/2A) of an infectious cDNA clone of the SAT2 vaccine strain, ZIM/7/83, with that of SAT1 virus KNP/196/91. The vKNP/SAT2 virus exhibited comparable infection kinetics, virion stability and antigenic profiles to the KNP/196/91 parental virus, thus indicating that the functions provided by the capsid can be readily exchanged between serotypes. As these qualities are necessary for vaccine manufacturing, high titres of stable chimeric virus were obtained. Chemically inactivated vaccines, formulated as double-oil-in-water emulsions, were produced from intact 146S virion particles of both the chimeric and parental viruses. Inoculation of guinea pigs with the respective vaccines induced similar antibody responses. In order to show compliance with commercial vaccine requirements, the vaccines were evaluated in a full potency test. Pigs vaccinated with the chimeric vaccine produced neutralizing antibodies and showed protection against homologous FMDV challenge, albeit not to the same extent as for the vaccine prepared from the parental virus. These results provide support that chimeric vaccines containing the external capsid of field isolates can be successfully produced and that they induce protective immune responses in FMD host species.
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Affiliation(s)
- Belinda Blignaut
- Transboundary Animal Diseases Programme (TADP), Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort 0110, South Africa.
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Maree FF, Blignaut B, de Beer TAP, Visser N, Rieder EA. Mapping of amino acid residues responsible for adhesion of cell culture-adapted foot-and-mouth disease SAT type viruses. Virus Res 2010; 153:82-91. [PMID: 20637812 DOI: 10.1016/j.virusres.2010.07.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 07/06/2010] [Accepted: 07/08/2010] [Indexed: 11/29/2022]
Abstract
Foot-and-mouth disease virus (FMDV) infects host cells by adhering to the alpha(V) subgroup of the integrin family of cellular receptors in a Arg-Gly-Asp (RGD) dependent manner. FMD viruses, propagated in non-host cell cultures are reported to acquire the ability to enter cells via alternative cell surface molecules. Sequencing analysis of SAT1 and SAT2 cell culture-adapted variants showed acquisition of positively charged amino acid residues within surface-exposed loops of the outer capsid structural proteins. The fixation of positively charged residues at position 110-112 in the beta F-beta G loop of VP1 of SAT1 isolates is thought to correlate with the acquisition of the ability to utilise alternative glycosaminoglycan (GAG) molecules for cell entry. Similarly, two SAT2 viruses that adapted readily to BHK-21 cells accumulated positively charged residues at positions 83 and 85 of the beta D-beta E loop of VP1. Both regions surround the fivefold axis of the virion. Recombinant viruses containing positively charged residues at position 110 and 112 of VP1 were able to infect CHO-K1 cells (that expresses GAG) and demonstrated increased infectivity in BHK-21 cells. Therefore, recombinant SAT viruses engineered to express substitutions that induce GAG-binding could be exploited in the rational design of vaccine seed stocks with improved growth properties in cell cultures.
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Affiliation(s)
- Francois F Maree
- Transboundary Animal Diseases Programme, Onderstepoort Veterinary Institute, Agricultural Research Council, Onderstepoort 0110, South Africa.
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Chang Y, Zheng H, Shang Y, Jin Y, Wang G, Shen X, Liu X. Recovery of infectious foot-and-mouth disease virus from full-length genomic cDNA clones using an RNA polymerase I system. Acta Biochim Biophys Sin (Shanghai) 2009; 41:998-1007. [PMID: 20011974 DOI: 10.1093/abbs/gmp093] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The prototypic foot-and-mouth disease virus (FMDV) was shown more than a century ago to be the first filterable agent capable of causing FMD, and it has served as an important model for studying basic principles of Aphthovirus molecular biology. However, the complex structure and antigenic diversity of FMDV have posed a major obstacle to the attempts at manipulating the infectious virus by reverse genetic techniques. Here, we report the recovery of infectious FMDV from cDNAs based on an efficient in vivo RNA polymerase I (polI) transcription system. Intracellular transcription of the full-length viral genome from polI-based vectors resulted in efficient formation of infectious virus displaying a genetic marker. Compared with wild-type virus, an abundance of genomic mRNA and elevated expression levels of viral antigens were indicative of the hyperfunction throughout the life-cycle of this cDNA-derived virus at transcription, replication, and translation levels. The technology described here could be an extremely valuable molecular biology tool for studying FMDV complex infectious characteristics. It is an operating platform for studying FMDV functional genomics, molecular mechanism of pathogenicity and variation, and lays a solid foundation for the development of viral chimeras toward the prospect of a genetically engineered vaccine.
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Affiliation(s)
- Yanyan Chang
- Lanzhou Veterinary Research Institute of Chinese Academy of Agricultural Sciences, State Key Laboratory of Veterinary Etiological Biology, National Foot-and-Mouth Disease Reference Laboratory, Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou 730046, China
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Differences in the virulence of two strains of Foot-and-Mouth Disease Virus Serotype A with the same spatiotemporal distribution. Virus Res 2009; 147:149-52. [PMID: 19883705 DOI: 10.1016/j.virusres.2009.10.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2009] [Revised: 10/16/2009] [Accepted: 10/22/2009] [Indexed: 11/22/2022]
Abstract
During the 2000-2001 epidemic of Foot-and-Mouth Disease Virus (FMDV) in Argentina, two FMDV serotype A viruses were identified among others. Since different pathogenic properties between these virus strains were noticed in cattle, we evaluated several biological properties and features of FMDV A/Arg/00 and FMDV A/Arg/01 in order to compare these viruses in terms of virulence and pathogenicity. Our results indicate that FMDV A/Arg/00 grows less efficiently than FMDV A/Arg/01, exemplified by smaller sized plaques, retarded one-step growth curves and overall low viral yields. Also, FMDV A/Arg/00 displayed the lowest specific infectivity in suckling mice requiring 50-fold more infectious particles than FMDV A/Arg/01 to generate a LD50 in suckling mice. Finally, FMDV A/Arg/00 did not cause death in adult C57Bl/6 mice even at high doses (10(7)-10(6)PFU) whereas FMDV A/Arg/01 resulted lethal in doses as low as 10(2)PFU. Overall, we were able to demonstrate that these virus strains differ from each other in terms of virulence and pathogenicity.
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Genome analysis and development of infectious cDNA clone of a virulence-attenuated strain of foot-and-mouth disease virus type Asia 1 from China. Vet Microbiol 2009; 138:273-80. [PMID: 19410387 DOI: 10.1016/j.vetmic.2009.04.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2008] [Revised: 03/09/2009] [Accepted: 04/03/2009] [Indexed: 11/22/2022]
Abstract
The RNA genome sequence of the rabbit passage-attenuated strain of foot-and-mouth disease virus (FMDV) Asia 1, ZB/CHA/58(att), was determined to be 8165 nt in length excluding the poly(C) tract in the 5' UTR and the poly(A) tail at the 3' end. ZB/CHA/58(att) was most similar to the vaccine strain Asia 1/YNBS/58 in genome sequence and there were no deletions or insertions within the deduced polyprotein between ZB/CHA/58(att) and YNBS/58, but there were a total of 25 substitutions at the amino acid level and an extra 19-nt stretch in the 5' UTR was found in ZB/CHA/58(att). An infectious full-length cDNA clone of ZB/CHA/58(att) was developed. Infectious virus could be recovered in BHK-21 cells transfected with the synthetic viral RNA transcribed in vitro. The plaque morphology, growth kinetics and antigenic profile of the infectious clone-derived virus (termed tZB) were indistinguishable from those induced by the parental virus. Furthermore, the virulence properties of ZB/CHA/58(att) and tZB were found to be highly similar in the mouse model. The availability of genome sequence information and infectious cDNA clone of the FMDV ZB/CHA/58(att) lays a new ground for further investigation of FMDV virulence determinants and development of new potent vaccine to FMD.
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Bai X, Li P, Cao Y, Li D, Lu Z, Guo J, Sun D, Zheng H, Sun P, Liu X, Luo J, Liu Z. Engineering infectious foot-and-mouth disease virus in vivo from a full-length genomic cDNA clone of the A/AKT/58 strain. ACTA ACUST UNITED AC 2009; 52:155-62. [PMID: 19277527 DOI: 10.1007/s11427-009-0007-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2008] [Accepted: 06/16/2008] [Indexed: 10/21/2022]
Abstract
Two full-length genomic cDNA clones, pTA/FMDV and pCA/FMDV, were constructed that contained three point-mutants [A174G and A308G (not present in pTA/FMDV); T1029G] in the genome compared with the wild type A/AKT/58 strain of foot-and-mouth disease virus. These two viruses were rescued by co-transfection of pCA/FMDV with pCT7RNAP, which can express T7 RNA polymerase in BHK-21 cell-lines, or by transfection of the in vitro transcribed RNA. Their biological properties were analyzed for their antigenicity, virulence in suckling-mice (LD50) and growth kinetics in BHK-21 cells. The in vivo rescued viruses showed high pathogenicity for 3-day-old unweaned mice (LD50=10(-7.5)). However, the in vitro transcribed RNA derived from pTA/FMDV had lower pathogenicity for suckling-mice (LD50=10(-6)), and the in vivo transcribed RNA recovered from pCA/FMDV co-transfected with pCT7RNAP showed no significant differences from the wild type virus. These data showed that recovery of the infectious foot-and-mouth disease virus directly from the use of in vivo techniques was better than from in vitro methods. Furthermore, the reverse genetic procedure technique was simplified to a faster one-step procedure based on co-transfection with pCT7RNAP. These results suggest that in vivo RNA transcripts may be more valuable for engineering recombinant foot-and-mouth disease virus than in vitro RNA transcripts, and may contribute to further understanding of the biological properties, such as replication, maturation and quasispecies, of the foot-and-mouth disease virus.
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Affiliation(s)
- XingWen Bai
- Key Laboratory of Animal Virology of Ministry of Agriculture, Lanzhou Veterinary Research Institute of Chinese Academy of Agricultural Sciences, Lanzhou, 730046, China.
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Zheng H, Tian H, Jin Y, Wu J, Shang Y, Yin S, Liu X, Xie Q. Development of a hamster kidney cell line expressing stably T7 RNA polymerase using retroviral gene transfer technology for efficient rescue of infectious foot-and-mouth disease virus. J Virol Methods 2009; 156:129-37. [DOI: 10.1016/j.jviromet.2008.11.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2008] [Revised: 11/14/2008] [Accepted: 11/18/2008] [Indexed: 11/30/2022]
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Storey P, Theron J, Maree FF, O'Neill HG. A second RGD motif in the 1D capsid protein of a SAT1 type foot-and-mouth disease virus field isolate is not essential for attachment to target cells. Virus Res 2006; 124:184-92. [PMID: 17161881 DOI: 10.1016/j.virusres.2006.11.003] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2006] [Revised: 11/03/2006] [Accepted: 11/08/2006] [Indexed: 11/25/2022]
Abstract
The amino acid sequence motif Arg-Gly-Asp (RGD), located in the surface-exposed betaG-betaH loop of the 1D protein of different serotypes and subtypes of foot-and-mouth disease virus (FMDV), is highly conserved and participates in binding of FMDV to susceptible cells. Previous sequence analyses of the 1D-encoding region of a FMDV serotype SAT1 field isolate from Namibia (NAM/307/98) indicated the presence of a second RGD motif upstream of the conserved betaG-betaH loop RGD. The role of these RGD sequences in virus infection was investigated by mutating the betaG-betaH loop RGD to a KGE tripeptide, using a genome-length infectious chimeric cDNA clone. Although the infectivity of the derived mutant viruses for baby hamster kidney cells (BHK-21) was lost, subsequent replacement of the KGE sequence with RGD in the mutant cDNA clone led to recovery of infectious viruses. Furthermore, viral RNA replication could be demonstrated with the genetically engineered mutant and non-mutant viruses. The presence of virus particles in the transfected cells could be also demonstrated by electron microscopy. These results demonstrate that, in contrast to the betaG-betaH loop RGD motif, the second RGD sequence in the capsid protein 1D of NAM/307/98 does not function as a ligand for receptor binding in BHK-21 cells.
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Affiliation(s)
- P Storey
- Onderstepoort Veterinary Institute, Exotic Diseases Division, Private Bag X05, Onderstepoort 0010, South Africa
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Heath L, van der Walt E, Varsani A, Martin DP. Recombination patterns in aphthoviruses mirror those found in other picornaviruses. J Virol 2006; 80:11827-32. [PMID: 16971423 PMCID: PMC1642601 DOI: 10.1128/jvi.01100-06] [Citation(s) in RCA: 217] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
Foot-and-mouth disease virus (FMDV) is thought to evolve largely through genetic drift driven by the inherently error-prone nature of its RNA polymerase. There is, however, increasing evidence that recombination is an important mechanism in the evolution of these and other related picornoviruses. Here, we use an extensive set of recombination detection methods to identify 86 unique potential recombination events among 125 publicly available FMDV complete genome sequences. The large number of events detected between members of different serotypes suggests that horizontal flow of sequences among the serotypes is relatively common and does not incur severe fitness costs. Interestingly, the distribution of recombination breakpoints was found to be largely nonrandom. Whereas there are clear breakpoint cold spots within the structural genes, two statistically significant hot spots precisely separate these from the nonstructural genes. Very similar breakpoint distributions were found for other picornovirus species in the genera Enterovirus and Teschovirus. Our results suggest that genome regions encoding the structural proteins of both FMDV and other picornaviruses are functionally interchangeable modules, supporting recent proposals that the structural and nonstructural coding regions of the picornaviruses are evolving largely independently of one another.
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Affiliation(s)
- Livio Heath
- Department of Molecular and Cell Biology, Faculty of Science, University of Cape Town, Rondebosch 7701, South Africa
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