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Ujike M, Suzuki T. Progress of research on coronaviruses and toroviruses in large domestic animals using reverse genetics systems. Vet J 2024; 305:106122. [PMID: 38641200 DOI: 10.1016/j.tvjl.2024.106122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 03/24/2024] [Accepted: 04/14/2024] [Indexed: 04/21/2024]
Abstract
The generation of genetically engineered recombinant viruses from modified DNA/RNA is commonly referred to as reverse genetics, which allows the introduction of desired mutations into the viral genome. Reverse genetics systems (RGSs) are powerful tools for studying fundamental viral processes, mechanisms of infection, pathogenesis and vaccine development. However, establishing RGS for coronaviruses (CoVs) and toroviruses (ToVs), which have the largest genomes among vertebrate RNA viruses, is laborious and hampered by technical constraints. Hence, little research has focused on animal CoVs and ToVs using RGSs, especially in large domestic animals such as pigs and cattle. In the last decade, however, studies of porcine CoVs and bovine ToVs using RGSs have been reported. In addition, the coronavirus disease-2019 pandemic has prompted the development of new and simple CoV RGSs, which will accelerate RGS-based research on animal CoVs and ToVs. In this review, we summarise the general characteristics of CoVs and ToVs, the RGSs available for CoVs and ToVs and the progress made in the last decade in RGS-based research on porcine CoVs and bovine ToVs.
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Affiliation(s)
- Makoto Ujike
- Laboratory of Veterinary Infectious Diseases, Faculty of Veterinary Medicine, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino, Tokyo 180-8602, Japan; Research Center for Animal Life Science, Nippon Veterinary and Life Science University, 1-7-1 Kyonan-cho, Musashino, Tokyo 180-8602, Japan.
| | - Tohru Suzuki
- Division of Zoonosis Research, Sapporo Research Station, National Institute of Animal Health, NARO, Sapporo, Hokkaido 062-0045, Japan
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Schmied K, Ehmann R, Kristen-Burmann C, Ebert N, Barut GT, Almeida L, Kelly JN, Thomann L, Stalder H, Lang R, Tekes G, Thiel V. An RNA replicon system to investigate promising inhibitors of feline coronavirus. J Virol 2024; 98:e0121623. [PMID: 38236006 PMCID: PMC10878086 DOI: 10.1128/jvi.01216-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2023] [Accepted: 12/14/2023] [Indexed: 01/19/2024] Open
Abstract
Feline infectious peritonitis (FIP) is a fatal feline disease, caused by a feline coronavirus (FCoV), namely feline infectious peritonitis virus (FIPV). We produced a baby hamster kidney 21 (BHK) cell line expressing a serotype I FCoV replicon RNA with a green fluorescent protein (GFP) reporter gene (BHK-F-Rep) and used it as an in vitro screening system to test different antiviral compounds. Two inhibitors of the FCoV main protease (Mpro), namely GC376 and Nirmatrelvir, as well as the nucleoside analog Remdesivir proved to be effective in inhibiting the replicon system. Different combinations of these compounds also proved to be potent inhibitors, having an additive effect when combined. Remdesivir, GC376, and Nirmatrelvir all have a 50% cytotoxic concentration (CC50) more than 200 times higher than their half-maximal inhibitory concentrations (IC50), making them important candidates for future in vivo studies as well as clinically implemented drug candidates. In addition, results were acquired with a virus infection system, where Felis catus whole fetus 4 (Fcwf-4) cells were infected with a previously described recombinant GFP-expressing FIPV (based on the laboratory-adapted serotype I FIPV strain Black) and treated with the most promising compounds. Results acquired with the replicon system were comparable to the results acquired with the virus infection system, demonstrating that we successfully implemented the FCoV replicon system for antiviral screening. We expect that this system will greatly facilitate future screens for anti-FIPV compounds and provide a non-infectious system to study and evaluate drug-resistant mutations that may emerge in the FIPV genome.IMPORTANCEFIPV is of great significance in the cat population around the world, causing 0.3%-1.4% of feline deaths in veterinary practices (2). As there are neither effective preventive measures nor approved treatment options available, there is an urgent need to identify antiviral drugs against FIPV. Our FCoV replicon system provides a valuable tool for drug discovery in vitro. Due to the lack of cell culture systems for serotype I FCoVs (the serotype most prevalent in the feline population) (2), a different system is needed to study these viruses. A viral replicon system is a valuable tool for studying FCoVs. Overall, our results demonstrate the utility of the serotype I feline coronavirus replicon system for antiviral screening as well as to study this virus in general. We propose several compounds representing promising candidates for future clinical trials and ultimately with the potential to save cats suffering from FIP.
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Affiliation(s)
- Kimberly Schmied
- Institute of Virology and Immunology (IVI), Bern and Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Rosina Ehmann
- Institute of Virology, Justus Liebig University Giessen, Giessen, Germany
| | | | - Nadine Ebert
- Institute of Virology and Immunology (IVI), Bern and Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Güliz Tuba Barut
- Institute of Virology and Immunology (IVI), Bern and Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Lea Almeida
- Institute of Virology and Immunology (IVI), Bern and Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Jenna N. Kelly
- Institute of Virology and Immunology (IVI), Bern and Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- Multidisciplinary Center for Infectious Diseases (MCID), University of Bern, Bern, Switzerland
- European Virus Bioinformatics Center (EVBC), Jena, Germany
| | - Lisa Thomann
- Institute of Virology and Immunology (IVI), Bern and Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Hanspeter Stalder
- Institute of Virology and Immunology (IVI), Bern and Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - Reto Lang
- Institute of Virology and Immunology (IVI), Bern and Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
| | - Gergely Tekes
- Institute of Virology, Justus Liebig University Giessen, Giessen, Germany
| | - Volker Thiel
- Institute of Virology and Immunology (IVI), Bern and Mittelhäusern, Switzerland
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
- Multidisciplinary Center for Infectious Diseases (MCID), University of Bern, Bern, Switzerland
- European Virus Bioinformatics Center (EVBC), Jena, Germany
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Chawla M, Cuspoca AF, Akthar N, Magdaleno JSL, Rattanabunyong S, Suwattanasophon C, Jongkon N, Choowongkomon K, Shaikh AR, Malik T, Cavallo L. Immunoinformatics-aided rational design of a multi-epitope vaccine targeting feline infectious peritonitis virus. Front Vet Sci 2023; 10:1280273. [PMID: 38192725 PMCID: PMC10773687 DOI: 10.3389/fvets.2023.1280273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Accepted: 11/27/2023] [Indexed: 01/10/2024] Open
Abstract
Feline infectious peritonitis (FIP) is a grave and frequently lethal ailment instigated by feline coronavirus (FCoV) in wild and domestic feline species. The spike (S) protein of FCoV assumes a critical function in viral ingress and infection, thereby presenting a promising avenue for the development of a vaccine. In this investigation, an immunoinformatics approach was employed to ascertain immunogenic epitopes within the S-protein of FIP and formulate an innovative vaccine candidate. By subjecting the amino acid sequence of the FIP S-protein to computational scrutiny, MHC-I binding T-cell epitopes were predicted, which were subsequently evaluated for their antigenicity, toxicity, and allergenicity through in silico tools. Our analyses yielded the identification of 11 potential epitopes capable of provoking a robust immune response against FIPV. Additionally, molecular docking analysis demonstrated the ability of these epitopes to bind with feline MHC class I molecules. Through the utilization of suitable linkers, these epitopes, along with adjuvants, were integrated to design a multi-epitope vaccine candidate. Furthermore, the stability of the interaction between the vaccine candidate and feline Toll-like receptor 4 (TLR4) was established via molecular docking and molecular dynamics simulation analyses. This suggests good prospects for future experimental validation to ascertain the efficacy of our vaccine candidate in inducing a protective immune response against FIP.
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Affiliation(s)
- Mohit Chawla
- Physical Sciences and Engineering Division, Kaust Catalysis Center, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Andrés Felipe Cuspoca
- Grupo de Investigación en Epidemiología Clínica de Colombia (GRECO), Universidad Pedagógica yTecnológica de Colombia, Tunja, Colombia
- Centro de Atención e Investigación Médica–CAIMED, Chía, Colombia
| | - Nahid Akthar
- Department of Research and Innovation, STEMskills Research and Education Lab Private Limited, Faridabad, Haryana, India
| | - Jorge Samuel Leon Magdaleno
- Physical Sciences and Engineering Division, Kaust Catalysis Center, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | | | | | - Nathjanan Jongkon
- Department of Social and Applied Science, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok, Bangkok, Thailand
| | | | - Abdul Rajjak Shaikh
- Department of Research and Innovation, STEMskills Research and Education Lab Private Limited, Faridabad, Haryana, India
| | - Tabarak Malik
- Department of Biomedical Sciences, Institute of Health, Jimma University, Jimma, Ethiopia
| | - Luigi Cavallo
- Physical Sciences and Engineering Division, Kaust Catalysis Center, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
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Cao H, Gu H, Kang H, Jia H. Development of a rapid reverse genetics system for feline coronavirus based on TAR cloning in yeast. Front Microbiol 2023; 14:1141101. [PMID: 37032894 PMCID: PMC10076789 DOI: 10.3389/fmicb.2023.1141101] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2023] [Accepted: 03/01/2023] [Indexed: 04/11/2023] Open
Abstract
Introduction Reverse genetics has become an indispensable tool to gain insight into the pathogenesis of viruses and the development of vaccines. The yeast-based synthetic genomics platform has demonstrated the novel capabilities to genetically reconstruct different viruses. Methods In this study, a transformation-associated recombination (TAR) system in yeast was used to rapidly rescue different strains of feline infectious peritonitis virus, which causes a deadly disease of cats for which there is no effective vaccine. Results and discussion Using this system, the viruses could be rescued rapidly and stably without multiple cloning steps. Considering its speed and ease of manipulation in virus genome assembly, the reverse genetics system developed in this study will facilitate the research of the feline coronaviruses pathogenetic mechanism and the vaccine development.
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Abstract
Historically part of the coronavirus (CoV) family, torovirus (ToV) was recently classified into the new family Tobaniviridae. While reverse genetics systems have been established for various CoVs, none exist for ToVs. Herein, we developed a reverse genetics system using an infectious full-length cDNA clone of bovine ToV (BToV) in a bacterial artificial chromosome (BAC). Recombinant BToV harboring genetic markers had the same phenotype as wild-type (wt) BToV. To generate two types of recombinant virus, the hemagglutinin-esterase (HE) gene was edited, as cell-adapted wtBToV generally loses full-length HE (HEf), resulting in soluble HE (HEs). First, recombinant viruses with HEf and HA-tagged HEf or HEs genes were rescued. These exhibited no significant differences in their effect on virus growth in HRT18 cells, suggesting that HE is not essential for viral replication in these cells. Thereafter, we generated recombinant virus (rEGFP), wherein HE was replaced by the enhanced green fluorescent protein (EGFP) gene. The rEGFP expressed EGFP in infected cells, but showed significantly lower viral growth compared to wtBToV. Moreover, the rEGFP readily deleted the EGFP gene after one passage. Interestingly, rEGFP variants with two mutations (C1442F and I3562T) in non-structural proteins (NSPs) that emerged during passages exhibited improved EGFP expression, EGFP gene retention, and viral replication. An rEGFP into which both mutations were introduced displayed a similar phenotype to these variants, suggesting that the mutations contributed to EGFP gene acceptance. The current findings provide new insights into BToV, and reverse genetics will help advance the current understanding of this neglected pathogen. Importance ToVs are diarrhea-causing pathogens detected in various species, including humans. Through the development of a BAC-based BToV, we introduced the first reverse genetics system for Tobaniviridae. Utilizing this system, recombinant BToVs with a full-length HE gene were generated. Remarkably, although clinical BToVs generally lose the HE gene after a few passages, some recombinant viruses generated in the current study retained the HE gene for up to 20 passages while accumulating mutations in NSPs, which suggested that these mutations may be involved in HE gene retention. The EGFP gene of recombinant viruses was unstable, but rEGFP into which two NSP mutations were introduced exhibited improved EGFP expression, gene retention, and viral replication. These data suggested the existence of an NSP-based acceptance or retention mechanism for exogenous RNA or HE genes. Recombinant BToVs and reverse genetics are powerful tools for understanding fundamental viral processes, infection pathogenesis, and BToV vaccine development.
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Tekes G, Ehmann R, Boulant S, Stanifer ML. Development of Feline Ileum- and Colon-Derived Organoids and Their Potential Use to Support Feline Coronavirus Infection. Cells 2020; 9:E2085. [PMID: 32932592 PMCID: PMC7563363 DOI: 10.3390/cells9092085] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 09/10/2020] [Accepted: 09/10/2020] [Indexed: 12/29/2022] Open
Abstract
Feline coronaviruses (FCoVs) infect both wild and domestic cat populations world-wide. FCoVs present as two main biotypes: the mild feline enteric coronavirus (FECV) and the fatal feline infectious peritonitis virus (FIPV). FIPV develops through mutations from FECV during a persistence infection. So far, the molecular mechanism of FECV-persistence and contributing factors for FIPV development may not be studied, since field FECV isolates do not grow in available cell culture models. In this work, we aimed at establishing feline ileum and colon organoids that allow the propagation of field FECVs. We have determined the best methods to isolate, culture and passage feline ileum and colon organoids. Importantly, we have demonstrated using GFP-expressing recombinant field FECV that colon organoids are able to support infection of FECV, which were unable to infect traditional feline cell culture models. These organoids in combination with recombinant FECVs can now open the door to unravel the molecular mechanisms by which FECV can persist in the gut for a longer period of time and how transition to FIPV is achieved.
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Affiliation(s)
- Gergely Tekes
- Institute of Virology, Justus Liebig University Giessen, 35390 Giessen, Germany
| | - Rosina Ehmann
- Bundeswehr Institute of Microbiology, 80937 Munich, Germany;
| | - Steeve Boulant
- Department of Infectious Diseases, Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany;
- Research Group “Cellular Polarity and Viral Infection”, German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Megan L. Stanifer
- Department of Infectious Diseases, Molecular Virology, Heidelberg University Hospital, 69120 Heidelberg, Germany
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Establishment of a Virulent Full-Length cDNA Clone for Type I Feline Coronavirus Strain C3663. J Virol 2019; 93:JVI.01208-19. [PMID: 31375588 PMCID: PMC6803248 DOI: 10.1128/jvi.01208-19] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 07/26/2019] [Indexed: 02/07/2023] Open
Abstract
Feline infectious peritonitis (FIP) is one of the most important infectious diseases in cats and is caused by feline coronavirus (FCoV). Tissue culture-adapted type I FCoV shows reduced FIP induction in experimental infections, which complicates the understanding of FIP pathogenesis caused by type I FCoV. We previously found that the type I FCoV strain C3663 efficiently induces FIP in specific-pathogen-free cats through the naturally infectious route. In this study, we employed a bacterial artificial chromosome-based reverse genetics system to gain more insights into FIP caused by the C3633 strain. We successfully generated recombinant virus (rC3663) from Fcwf-4 cells transfected with infectious cDNA that showed growth kinetics similar to those shown by the parental virus. Next, we constructed a reporter C3663 virus carrying the nanoluciferase (Nluc) gene to measure viral replication with high sensitivity. The inhibitory effects of different compounds against rC3663-Nluc could be measured within 24 h postinfection. Furthermore, we found that A72 cells derived from canine fibroblasts permitted FCoV replication without apparent cytopathic effects. Thus, our reporter virus is useful for uncovering the infectivity of type I FCoV in different cell lines, including canine-derived cells. Surprisingly, we uncovered aberrant viral RNA transcription of rC3663 in A72 cells. Overall, we succeeded in obtaining infectious cDNA clones derived from type I FCoV that retained its virulence. Our recombinant FCoVs are powerful tools for increasing our understanding of the viral life cycle and pathogenesis of FIP-inducing type I FCoV.IMPORTANCE Feline coronavirus (FCoV) is one of the most significant coronaviruses, because this virus induces feline infectious peritonitis (FIP), which is a lethal disease in cats. Tissue culture-adapted type I FCoV often loses pathogenicity, which complicates research on type I FCoV-induced feline infectious peritonitis (FIP). Since we previously found that type I FCoV strain C3663 efficiently induces FIP in specific-pathogen-free cats, we established a reverse genetics system for the C3663 strain to obtain recombinant viruses in the present study. By using a reporter C3663 virus, we were able to examine the inhibitory effect of 68 compounds on C3663 replication in Fcwf-4 cells and infectivity in a canine-derived cell line. Interestingly, one canine cell line, A72, permitted FCoV replication but with low efficiency and aberrant viral gene expression.
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Zhao Y, Cheng J, Xu G, Thiel V, Zhang G. Successful establishment of a reverse genetic system for QX-type infectious bronchitis virus and technical improvement of the rescue procedure. Virus Res 2019; 272:197726. [PMID: 31430502 PMCID: PMC7114641 DOI: 10.1016/j.virusres.2019.197726] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 08/16/2019] [Accepted: 08/16/2019] [Indexed: 12/22/2022]
Abstract
A vaccinia virus-based IBV reverse genetics system was developed. BHK21/N cells and ECE were used to improve rescue efficiency. The improved rescue procedure is readily applicable to other IBVs.
In this study, a pathogenic avian infectious bronchitis virus (IBV) QX-type strain YN was successfully rescued by vaccinia virus based reverse genetic technology. Ten fragments contiguously spanning the complete IBV genome were amplified and cloned into the vaccinia virus genome by homologous recombination. The full-length genomic cDNA was transcribed in vitro, and its transcript was transfected into BHK-21/N cells that could stably express IBV N protein. At 48 h post transfection, the culture medium was harvested and inoculated into 10-day-old specific-pathogen-free embryonated chicken eggs to replicate the rescued virus. This strategy was chosen to facilitate the rescue procedure and to ensure that the recombinant rYN virus will not require any cell culture adaptations. After only one in ovo passage, the recombinant YN virus (rYN) was successfully recovered and confirmed to possess the introduced silent marker mutation in its genome. Biological characteristics of rYN such as the EID50, TCID50, replication in ovo, and replication kinetcs in vitro were tested and all were similar to its parental strain YN. Our findings demonstrate the successful construction of highly-pathogenic QX-type IBV using a modified rescue procedure, allowing for future studies of the molecular biology and pathogenicity of IBV field strains.
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Affiliation(s)
- Ye Zhao
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Jinlong Cheng
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Gang Xu
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China
| | - Volker Thiel
- Institute for Virology and Immunology, 3012, Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty Bern, University of Bern, Switzerland.
| | - Guozhong Zhang
- Key Laboratory of Animal Epidemiology of the Ministry of Agriculture, College of Veterinary Medicine, China Agricultural University, Beijing, 100193, China.
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Takano T, Yamada S, Doki T, Hohdatsu T. Pathogenesis of oral type I feline infectious peritonitis virus (FIPV) infection: Antibody-dependent enhancement infection of cats with type I FIPV via the oral route. J Vet Med Sci 2019; 81:911-915. [PMID: 31019150 PMCID: PMC6612493 DOI: 10.1292/jvms.18-0702] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Feline infectious peritonitis virus (FIPV) causes a severe, immune-mediated disease called FIP in domestic and wild cats. It is unclear whether FIP transmits from cat to cat through the oral route of FIPV infection, and the reason for this includes that FIP is caused by oral inoculation with some FIPV strains (e.g., type II FIPV WSU 79-1146), but is not caused by other FIPV (e.g., type I FIPV KU-2 strain: FIPV-I KU-2). In this study, when cats passively immunized with anti-FIPV-I KU-2 antibodies were orally inoculated with FIPV-I KU-2, FIP was caused at a 50% probability, i.e., FIPV not causing FIP through oral infection caused FIP by inducing antibody-dependent enhancement. Many strains of type I FIPV do not cause FIP by inoculation through the oral route in cats. Based on the findings of this study, type I FIPV which orally infected cats may cause FIP depending on the condition.
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Affiliation(s)
- Tomomi Takano
- School of Veterinary Medicine, Kitasato University, Towada, Aomori 034-8628, Japan
| | - Shinji Yamada
- School of Veterinary Medicine, Kitasato University, Towada, Aomori 034-8628, Japan.,Department of Antibody Drug Development, Tohoku University Graduate School of Medicine, Sendai, Miyagi 980-8575, Japan
| | - Tomoyoshi Doki
- School of Veterinary Medicine, Kitasato University, Towada, Aomori 034-8628, Japan
| | - Tsutomu Hohdatsu
- School of Veterinary Medicine, Kitasato University, Towada, Aomori 034-8628, Japan
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O'Brien A, Mettelman RC, Volk A, André NM, Whittaker GR, Baker SC. Characterizing replication kinetics and plaque production of type I feline infectious peritonitis virus in three feline cell lines. Virology 2018; 525:1-9. [PMID: 30205273 PMCID: PMC6483087 DOI: 10.1016/j.virol.2018.08.022] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Revised: 08/31/2018] [Accepted: 08/31/2018] [Indexed: 11/29/2022]
Abstract
Investigating type I feline coronaviruses (FCoVs) in tissue culture is critical for understanding the basic virology, pathogenesis, and virus-host interactome of these important veterinary pathogens. This has been a perennial challenge as type I FCoV strains do not easily adapt to cell culture. Here we characterize replication kinetics and plaque formation of a model type I strain FIPV Black in Fcwf-4 cells established at Cornell University (Fcwf-4 CU). We determined that maximum virus titers (>107 pfu/mL) were recoverable from infected Fcwf-4 CU cell-free supernatant at 20 h post-infection. Type I FIPV Black and both biotypes of type II FCoV formed uniform and enumerable plaques on Fcwf-4 CU cells. Therefore, these cells were employable in a standardized plaque assay. Finally, we determined that the Fcwf-4 CU cells were morphologically distinct from feline bone marrow-derived macrophages and were less sensitive to exogenous type I interferon than were Fcwf-4 cells purchased from ATCC.
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Affiliation(s)
- Amornrat O'Brien
- Department of Microbiology and Immunology, Loyola University of Chicago, Stritch School of Medicine, Maywood, IL, United States
| | - Robert C Mettelman
- Department of Microbiology and Immunology, Loyola University of Chicago, Stritch School of Medicine, Maywood, IL, United States
| | - Aaron Volk
- Department of Microbiology and Immunology, Loyola University of Chicago, Stritch School of Medicine, Maywood, IL, United States
| | - Nicole M André
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - Gary R Whittaker
- Department of Microbiology and Immunology, College of Veterinary Medicine, Cornell University, Ithaca, NY, United States
| | - Susan C Baker
- Department of Microbiology and Immunology, Loyola University of Chicago, Stritch School of Medicine, Maywood, IL, United States.
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Reverse Genetics for Type I Feline Coronavirus Field Isolate To Study the Molecular Pathogenesis of Feline Infectious Peritonitis. mBio 2018; 9:mBio.01422-18. [PMID: 30065095 PMCID: PMC6069117 DOI: 10.1128/mbio.01422-18] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Feline infectious peritonitis (FIP), one of the most important lethal infections of cats, is caused by feline infectious peritonitis virus (FIPV), the high-virulence biotype of feline coronaviruses (FCoVs). FIPVs are suggested to emerge from feline enteric coronaviruses (FECVs) by acquiring mutations in specific genes in the course of persistent infections. Although numerous studies identified mutations predicted to be responsible for the FECV-FIPV biotype switch, the presumed roles of specific genetic changes in FIP pathogenesis have not been confirmed experimentally. Reverse genetics systems established previously for serotype I and the less common serotype II FCoVs were based on cell culture-adapted FIPV strains which, however, were shown to be unsuitable for FIP pathogenesis studies in vivo To date, systems to produce and manipulate recombinant serotype I field viruses have not been developed, mainly because these viruses cannot be grown in vitro Here, we report the first reverse genetics system based on a serotype I FECV field isolate that is suitable to produce high-titer stocks of recombinant FECVs. We demonstrate that these recombinant viruses cause productive persistent infections in cats that are similar to what is observed in natural infections. The system provides an excellent tool for studying FCoVs that do not grow in standard cell culture systems and will greatly facilitate studies into the molecular pathogenesis of FIP. Importantly, the system could also be adapted for studies of other RNA viruses with large genomes whose production and characterization in vivo are currently hampered by the lack of in vitro propagation systems.IMPORTANCE The availability of recombinant serotype I FCoV field isolates that are amenable to genetic manipulation is key to studying the molecular pathogenesis of FIP, especially since previous studies using cell culture-adapted FIPVs had proven unsuccessful. To our knowledge, we report the first serotype I FECV field isolate-based reverse genetics system that allows the production of high-titer recombinant virus stocks that can be used for subsequent in vivo studies in cats. The system represents a milestone in FCoV research. It provides an essential tool for studying the molecular pathogenesis of FIP and, more specifically, the functions of specific gene products in causing a fundamentally different progression of disease following acquisition of specific mutations. The system developed in this study will also be useful for studying other coronaviruses or more distantly related RNA viruses with large genomes for which suitable in vitro culture systems are not available.
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Florek D, Ehmann R, Kristen-Burmann C, Lemmermeyer T, Lochnit G, Ziebuhr J, Thiel HJ, Tekes G. Identification and characterization of a Golgi retention signal in feline coronavirus accessory protein 7b. J Gen Virol 2017; 98:2017-2029. [PMID: 28758629 PMCID: PMC7212014 DOI: 10.1099/jgv.0.000879] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Feline coronaviruses encode five accessory proteins with largely elusive functions. Here, one of these proteins, called 7b (206 residues), was investigated using a reverse genetic approach established for feline infectious peritonitis virus (FIPV) strain 79–1146. Recombinant FIPVs (rFPIVs) expressing mutant and/or FLAG-tagged forms of 7b were generated and used to investigate the expression, processing, glycosylation, localization and trafficking of the 7b protein in rFIPV-infected cells, focusing on a previously predicted ER retention signal, KTEL, at the C-terminus of 7b. The study revealed that 7b is N-terminally processed by a cellular signalase. The cleavage site, 17-Ala|Thr-18, was unambiguously identified by N-terminal sequence analysis of a 7b processing product purified from rFIPV-infected cells. Based on this information, rFIPVs expressing FLAG-tagged 7b proteins were generated and the effects of substitutions in the C-terminal 202KTEL206 sequence were investigated. The data show that (i) 7b localizes to and is retained in the medial- and/or trans-Golgi compartment, (ii) the C-terminal KTEL sequence acts as a Golgi [rather than an endoplasmic reticulum (ER)] retention signal, (iii) minor changes in the KTEL motif (such as KTE, KTEV, or the addition of a C-terminal tag) abolish Golgi retention, resulting in relocalization and secretion of 7b, and (iv) a KTEL-to-KDEL replacement causes retention of 7b in the ER of rFIPV-infected feline cells. Taken together, this study provides interesting new insights into an efficient Golgi retention signal that controls the cellular localization and trafficking of the FIPV 7b protein in virus-infected feline cells.
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Affiliation(s)
- Dominik Florek
- Institute of Virology, Justus Liebig University Giessen, Germany
| | - Rosina Ehmann
- Institute of Virology, Justus Liebig University Giessen, Germany
| | | | - Tanja Lemmermeyer
- Institute of Virology, Justus Liebig University Giessen, Germany.,Present address: JOTEC GmbH, Lotzenäcker 23, 72379 Hechingen, Germany
| | - Günter Lochnit
- Institute of Biochemistry, Justus Liebig University Giessen, Germany
| | - John Ziebuhr
- Institute of Medical Virology, Justus Liebig University Giessen, Germany
| | | | - Gergely Tekes
- Institute of Virology, Justus Liebig University Giessen, Germany
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13
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Safi N, Haghani A, Ng SW, Selvarajah GT, Mustaffa-Kamal F, Omar AR. Expression profiles of immune mediators in feline Coronavirus-infected cells and clinical samples of feline Coronavirus-positive cats. BMC Vet Res 2017; 13:92. [PMID: 28388950 PMCID: PMC5384144 DOI: 10.1186/s12917-017-1019-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 04/03/2017] [Indexed: 02/06/2023] Open
Abstract
Background There are two biotypes of feline coronavirus (FCoV): the self-limiting feline enteric coronavirus (FECV) and the feline infectious peritonitis virus (FIPV), which causes feline infectious peritonitis (FIP), a fatal disease associated with cats living in multi-cat environments. This study provides an insight on the various immune mediators detected in FCoV-positive cats which may be responsible for the development of FIP. Results In this study, using real-time PCR and multiplex bead-based immunoassay, the expression profiles of several immune mediators were examined in Crandell-Reese feline kidney (CRFK) cells infected with the feline coronavirus (FCoV) strain FIPV 79–1146 and in samples obtained from FCoV-positive cats. CRFK cells infected with FIPV 79–1146 showed an increase in the expression of interferon-related genes and pro-inflammatory cytokines such as MX1, viperin, CXCL10, CCL8, RANTES, KC, MCP1, and IL8. In addition, an increase in the expression of the above cytokines as well as GM-CSF and IFNγ was also detected in the PBMC, serum, and peritoneal effusions of FCoV-positive cats. Although the expression of MX1 and viperin genes was variable between cats, the expression of these two genes was relatively higher in cats having peritoneal effusion compared to cats without clinically obvious effusion. Higher viral load was also detected in the supernatant of peritoneal effusions compared to in the plasma of FCoV-positive cats. As expected, the secretion of IL1β, IL6 and TNFα was readily detected in the supernatant of peritoneal effusions of the FCoV-positive cats. Conclusions This study has identified various pro-inflammatory cytokines and interferon-related genes such as MX1, viperin, CXCL10, CCL8, RANTES, KC, MCP1, IL8, GM-CSF and IFNγ in FCoV-positive cats. With the exception of MX1 and viperin, no distinct pattern of immune mediators was observed that distinguished between FCoV-positive cats with and without peritoneal effusion. Further studies based on definitive diagnosis of FIP need to be performed to confirm the clinical importance of this study.
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Affiliation(s)
- Nikoo Safi
- Institute of Bioscience, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.,Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, USA
| | - Amin Haghani
- Institute of Bioscience, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.,Leonard Davis School of Gerontology, University of Southern California, Los Angeles, CA, USA
| | - Shing Wei Ng
- Institute of Bioscience, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
| | | | - Farina Mustaffa-Kamal
- Faculty of Veterinary Medicine, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.
| | - Abdul Rahman Omar
- Institute of Bioscience, Universiti Putra Malaysia, Serdang, Selangor, Malaysia.,Faculty of Veterinary Medicine, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
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14
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Teeravechyan S, Frantz PN, Wongthida P, Chailangkarn T, Jaru-Ampornpan P, Koonpaew S, Jongkaewwattana A. Deciphering the biology of porcine epidemic diarrhea virus in the era of reverse genetics. Virus Res 2016; 226:152-171. [PMID: 27212685 PMCID: PMC7114553 DOI: 10.1016/j.virusres.2016.05.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 05/04/2016] [Accepted: 05/04/2016] [Indexed: 01/01/2023]
Abstract
Emergence of the porcine epidemic diarrhea virus (PEDV) as a global threat to the swine industry underlies the urgent need for deeper understanding of this virus. To date, we have yet to identify functions for all the major gene products, much less grasp their implications for the viral life cycle and pathogenic mechanisms. A major reason is the lack of genetic tools for studying PEDV. In this review, we discuss the reverse genetics approaches that have been successfully used to engineer infectious clones of PEDV as well as other potential and complementary methods that have yet to be applied to PEDV. The importance of proper cell culture for successful PEDV propagation and maintenance of disease phenotype are addressed in our survey of permissive cell lines. We also highlight areas of particular relevance to PEDV pathogenesis and disease that have benefited from reverse genetics studies and pressing questions that await resolution by such studies. In particular, we examine the spike protein as a determinant of viral tropism, entry and virulence, ORF3 and its association with cell culture adaptation, and the nucleocapsid protein and its potential role in modulating PEDV pathogenicity. Finally, we conclude with an exploration of how reverse genetics can help mitigate the global impact of PEDV by addressing the challenges of vaccine development.
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Affiliation(s)
- Samaporn Teeravechyan
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, 12120 Thailand
| | - Phanramphoei Namprachan Frantz
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, 12120 Thailand
| | - Phonphimon Wongthida
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, 12120 Thailand
| | - Thanathom Chailangkarn
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, 12120 Thailand
| | - Peera Jaru-Ampornpan
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, 12120 Thailand
| | - Surapong Koonpaew
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, 12120 Thailand
| | - Anan Jongkaewwattana
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathumthani, 12120 Thailand.
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15
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Wei J, Damania A, Gao X, Liu Z, Mejia R, Mitreva M, Strych U, Bottazzi ME, Hotez PJ, Zhan B. The hookworm Ancylostoma ceylanicum intestinal transcriptome provides a platform for selecting drug and vaccine candidates. Parasit Vectors 2016; 9:518. [PMID: 27677574 PMCID: PMC5039805 DOI: 10.1186/s13071-016-1795-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2016] [Accepted: 09/12/2016] [Indexed: 12/02/2022] Open
Abstract
Background The intestine of hookworms contains enzymes and proteins involved in the blood-feeding process of the parasite and is therefore a promising source of possible vaccine antigens. One such antigen, the hemoglobin-digesting intestinal aspartic protease known as Na-APR-1 from the human hookworm Necator americanus, is currently a lead candidate antigen in clinical trials, as is Na-GST-1 a heme-detoxifying glutathione S-transferase. Methods In order to discover additional hookworm vaccine antigens, messenger RNA was obtained from the intestine of male hookworms, Ancylostoma ceylanicum, maintained in hamsters. RNA-seq was performed using Illumina high-throughput sequencing technology. The genes expressed in the hookworm intestine were compared with those expressed in the whole worm and those genes overexpressed in the parasite intestine transcriptome were further analyzed. Results Among the lead transcripts identified were genes encoding for proteolytic enzymes including an A. ceylanicum APR-1, but the most common proteases were cysteine-, serine-, and metallo-proteases. Also in abundance were specific transporters of key breakdown metabolites, including amino acids, glucose, lipids, ions and water; detoxifying and heme-binding glutathione S-transferases; a family of cysteine-rich/antigen 5/pathogenesis-related 1 proteins (CAP) previously found in high abundance in parasitic nematodes; C-type lectins; and heat shock proteins. These candidates will be ranked for downstream antigen target selection based on key criteria including abundance, uniqueness in the parasite versus the vertebrate host, as well as solubility and yield of expression. Conclusion The intestinal transcriptome of A. ceylanicum provides useful information for the identification of proteins involved in the blood-feeding process, representing a first step towards a reverse vaccinology approach to a human hookworm vaccine. Electronic supplementary material The online version of this article (doi:10.1186/s13071-016-1795-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Junfei Wei
- Sabin Vaccine Institute and Texas Children's Hospital Center for Vaccine Development, National School of Tropical Medicine, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Ashish Damania
- Sabin Vaccine Institute and Texas Children's Hospital Center for Vaccine Development, National School of Tropical Medicine, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Xin Gao
- McDonnell Genome Institute, Washington University School of Medicine, St. Louis, MO, 63108, USA
| | - Zhuyun Liu
- Sabin Vaccine Institute and Texas Children's Hospital Center for Vaccine Development, National School of Tropical Medicine, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Rojelio Mejia
- Sabin Vaccine Institute and Texas Children's Hospital Center for Vaccine Development, National School of Tropical Medicine, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Makedonka Mitreva
- McDonnell Genome Institute, Washington University School of Medicine, St. Louis, MO, 63108, USA.,Division of Infectious Diseases, Department of Medicine, Washington University School of Medicine, St. Louis, MO, 63108, USA
| | - Ulrich Strych
- Sabin Vaccine Institute and Texas Children's Hospital Center for Vaccine Development, National School of Tropical Medicine, Baylor College of Medicine, Houston, TX, 77030, USA
| | - Maria Elena Bottazzi
- Sabin Vaccine Institute and Texas Children's Hospital Center for Vaccine Development, National School of Tropical Medicine, Baylor College of Medicine, Houston, TX, 77030, USA.,Department of Biology, Baylor University, Waco, TX, 76706, USA
| | - Peter J Hotez
- Sabin Vaccine Institute and Texas Children's Hospital Center for Vaccine Development, National School of Tropical Medicine, Baylor College of Medicine, Houston, TX, 77030, USA.,Department of Biology, Baylor University, Waco, TX, 76706, USA
| | - Bin Zhan
- Sabin Vaccine Institute and Texas Children's Hospital Center for Vaccine Development, National School of Tropical Medicine, Baylor College of Medicine, Houston, TX, 77030, USA.
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16
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Abstract
Coronavirus particles serve three fundamentally important functions in infection. The virion provides the means to deliver the viral genome across the plasma membrane of a host cell. The virion is also a means of escape for newly synthesized genomes. Lastly, the virion is a durable vessel that protects the genome on its journey between cells. This review summarizes the available X-ray crystallography, NMR, and cryoelectron microscopy structural data for coronavirus structural proteins, and looks at the role of each of the major structural proteins in virus entry and assembly. The potential wider conservation of the nucleoprotein fold identified in the Arteriviridae and Coronaviridae families and a speculative model for the evolution of corona-like virus architecture are discussed.
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Affiliation(s)
- B W Neuman
- School of Biological Sciences, University of Reading, Reading, United Kingdom; College of STEM, Texas A&M University, Texarkana, Texarkana, TX, United States.
| | - M J Buchmeier
- University of California, Irvine, Irvine, CA, United States
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17
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Abstract
Coronaviruses have exceptionally large RNA genomes of approximately 30 kilobases. Genome replication and transcription is mediated by a multisubunit protein complex comprised of more than a dozen virus-encoded proteins. The protein complex is thought to bind specific cis-acting RNA elements primarily located in the 5′- and 3′-terminal genome regions and upstream of the open reading frames located in the 3′-proximal one-third of the genome. Here, we review our current understanding of coronavirus cis-acting RNA elements, focusing on elements required for genome replication and packaging. Recent bioinformatic, biochemical, and genetic studies suggest a previously unknown level of conservation of cis-acting RNA structures among different coronavirus genera and, in some cases, even beyond genus boundaries. Also, there is increasing evidence to suggest that individual cis-acting elements may be part of higher-order RNA structures involving long-range and dynamic RNA–RNA interactions between RNA structural elements separated by thousands of nucleotides in the viral genome. We discuss the structural and functional features of these cis-acting RNA elements and their specific functions in coronavirus RNA synthesis.
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Affiliation(s)
- R Madhugiri
- Institute of Medical Virology, Justus Liebig University Giessen, Giessen, Germany
| | - M Fricke
- Faculty of Mathematics and Computer Science, Friedrich Schiller University Jena, Jena, Germany
| | - M Marz
- Faculty of Mathematics and Computer Science, Friedrich Schiller University Jena, Jena, Germany; FLI Leibniz Institute for Age Research, Jena, Germany
| | - J Ziebuhr
- Institute of Medical Virology, Justus Liebig University Giessen, Giessen, Germany.
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18
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Abstract
Feline infectious peritonitis (FIP) belongs to the few animal virus diseases in which, in the course of a generally harmless persistent infection, a virus acquires a small number of mutations that fundamentally change its pathogenicity, invariably resulting in a fatal outcome. The causative agent of this deadly disease, feline infectious peritonitis virus (FIPV), arises from feline enteric coronavirus (FECV). The review summarizes our current knowledge of the genome and proteome of feline coronaviruses (FCoVs), focusing on the viral surface (spike) protein S and the five accessory proteins. We also review the current classification of FCoVs into distinct serotypes and biotypes, cellular receptors of FCoVs and their presumed role in viral virulence, and discuss other aspects of FIPV-induced pathogenesis. Our current knowledge of genetic differences between FECVs and FIPVs has been mainly based on comparative sequence analyses that revealed “discriminatory” mutations that are present in FIPVs but not in FECVs. Most of these mutations result in amino acid substitutions in the S protein and these may have a critical role in the switch from FECV to FIPV. In most cases, the precise roles of these mutations in the molecular pathogenesis of FIP have not been tested experimentally in the natural host, mainly due to the lack of suitable experimental tools including genetically engineered virus mutants. We discuss the recent progress in the development of FCoV reverse genetics systems suitable to generate recombinant field viruses containing appropriate mutations for in vivo studies.
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Affiliation(s)
- G Tekes
- Institute of Virology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Giessen, Germany.
| | - H-J Thiel
- Institute of Virology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Giessen, Germany
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19
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Animal Coronaviruses: A Brief Introduction. SPRINGER PROTOCOLS HANDBOOKS 2016. [PMCID: PMC7120424 DOI: 10.1007/978-1-4939-3414-0_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/29/2022]
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20
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Tekes G. Vaccinia Virus-Based Reverse Genetics for Feline Coronaviruses. SPRINGER PROTOCOLS HANDBOOKS 2016. [PMCID: PMC7122496 DOI: 10.1007/978-1-4939-3414-0_7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
For decades, the genetic modification of coronavirus genomes and the generation of recombinant coronaviruses have been hampered mostly due to the extraordinary large size of the coronaviral genome. The very first reverse genetic system for feline coronaviruses (FCoVs) was established in the early 2000s; the respective approach exclusively enabled the manipulation of the 3′-third of the viral genome. Later on, vaccinia virus- and bacterial artificial chromosome (BAC)-based systems have been developed. Both systems have the advantage that the entire FCoV genome is amenable for mutagenesis. The main focus of this chapter is the vaccinia virus-based reverse genetic system for FCoVs. Here we present protocols for (1) the generation of a full-length cDNA clone, (2) the manipulation of the FCoV genome, and (3) the rescue of recombinant FCoVs.
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21
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Characterization of monoclonal antibodies against feline coronavirus accessory protein 7b. Vet Microbiol 2015; 184:11-9. [PMID: 26854339 PMCID: PMC7117465 DOI: 10.1016/j.vetmic.2015.12.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2015] [Revised: 12/09/2015] [Accepted: 12/17/2015] [Indexed: 12/02/2022]
Abstract
Generation of monoclonal antibodies against accessory protein 7b of feline coronavirus. Identification of reactive epitopes. Relevance of glycosylation site for antigenicity.
Feline coronaviruses (FCoVs) encode five accessory proteins termed 3a, 3b, 3c, 7a and 7b of unknown function. These proteins are dispensable for viral replication in vitro but are supposed to play a role in virulence. In the current study, we produced and characterized 7b-specific monoclonal antibodies (mAbs). A recombinant form of the 7b protein was expressed as a fusion protein in Escherichia coli, purified by immobilized metal affinity chromatography and used as immunogen. Two hybridoma lines, 5B6 and 14D8, were isolated that expressed mAbs that recognized 7b proteins of both FCoV serotypes. Using an extensive set of N- and C-terminally truncated 7b proteins expressed in E. coli and a synthetic peptide, the binding sites of mAbs 5B6 and 14D8 were mapped to an 18-residue region that comprises the only potential N-glycosylation site of the FCoV 7b protein. The two mAbs were suitable to detect a 24-kDa protein, which represents the nonglycosylated form of 7b in FCoV-infected cells. We speculate that glycosylation of 7b is part of the viral evasion strategy to prevent an immune response against this antigenic site.
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22
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Takano T, Satomi Y, Oyama Y, Doki T, Hohdatsu T. Differential effect of cholesterol on type I and II feline coronavirus infection. Arch Virol 2015; 161:125-33. [PMID: 26514843 PMCID: PMC7086697 DOI: 10.1007/s00705-015-2655-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Accepted: 10/19/2015] [Indexed: 10/31/2022]
Abstract
Feline infectious peritonitis (FIP) is a fatal disease of domestic and wild felidae that is caused by feline coronavirus (FCoV). FCoV has been classified into types I and II. Since type I FCoV infection is dominant in the field, it is necessary to develop antiviral agents and vaccines against type I FCoV infection. However, few studies have been conducted on type I FCoV. Here, we compare the effects of cholesterol on types I and II FCoV infections. When cells were treated methyl-β-cyclodextrin (MβCD) and inoculated with type I FCoV, the infection rate decreased significantly, and the addition of exogenous cholesterol to MβCD-treated cells resulted in the recovery of the infectivity of type I FCoV. Furthermore, exogenous cholesterol increased the infectivity of type I FCoV. In contrast, the addition of MβCD and exogenous cholesterol had little effect on the efficiency of type II FCoV infection. These results strongly suggest that the dependence of infection by types I and II FCoV on cholesterol differs.
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Affiliation(s)
- Tomomi Takano
- Laboratory of Veterinary Infectious Disease, School of Veterinary Medicine, Kitasato University, Towada, Japan
| | - Yui Satomi
- Laboratory of Veterinary Infectious Disease, School of Veterinary Medicine, Kitasato University, Towada, Japan
| | - Yuu Oyama
- Laboratory of Veterinary Infectious Disease, School of Veterinary Medicine, Kitasato University, Towada, Japan
| | - Tomoyoshi Doki
- Laboratory of Veterinary Infectious Disease, School of Veterinary Medicine, Kitasato University, Towada, Japan
| | - Tsutomu Hohdatsu
- Laboratory of Veterinary Infectious Disease, School of Veterinary Medicine, Kitasato University, Towada, Japan.
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23
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Tanaka Y, Sasaki T, Matsuda R, Uematsu Y, Yamaguchi T. Molecular epidemiological study of feline coronavirus strains in Japan using RT-PCR targeting nsp14 gene. BMC Vet Res 2015; 11:57. [PMID: 25889235 PMCID: PMC4359392 DOI: 10.1186/s12917-015-0372-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2014] [Accepted: 02/24/2015] [Indexed: 12/05/2022] Open
Abstract
Background Feline infectious peritonitis is a fatal disease of cats caused by infection with feline coronavirus (FCoV). For detecting or genotyping of FCoV, some RT-PCR plus nested PCR techniques have been reported previously. However, referring to the whole genome sequences (WGSs) registered at NCBI, there are no detection methods that can tolerate the genetic diversity among FCoV population. In addition, the quasispecies nature of FCoV, which consists of heterogeneous variants, has been also demonstrated; thus, a universal method for heteropopulations of FCoV variants in clinical specimens is desirable. Results To develop an RT-PCR method for detection and genotyping of FCoV, we performed comparative genome analysis using WGSs of 32 FCoV, 7 CCoV and 5 TGEV strains obtained from NCBI. As the PCR target, we focused on the nsp14 coding region, which is highly conserved and phylogenetically informative, and developed a PCR method targeting nsp14 partial sequences. Among 103 ascites, 45 pleural effusion and 214 blood specimens from clinically ill cats, we could detect FCoV in 55 (53.4%), 14 (31.1%) and 19 (8.9%) specimens using the present method. Direct sequencing of PCR products and phylogenetic analysis allowed discrimination between type I- and II-FCoV serotypes. Our nsp14 amino acid sequence typing (nsp14 aa ST) showed that the FCoV clone with sequence type (ST) 42, which was the most predominant genotype of WGS strains, was prevalent in domestic cats in Japan. Conclusions Our nsp14 PCR scheme will contribute to virus detection, epidemiology and ecology of FCoV strains. Electronic supplementary material The online version of this article (doi:10.1186/s12917-015-0372-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yoshikazu Tanaka
- Department of Veterinary Hygiene, Veterinary School, Nippon Veterinary & Life Science University, 1-7-1 Kyounan, Musashino, Tokyo, 180-8602, Japan.
| | - Takashi Sasaki
- Department of Veterinary Hygiene, Veterinary School, Nippon Veterinary & Life Science University, 1-7-1 Kyounan, Musashino, Tokyo, 180-8602, Japan.
| | - Ryo Matsuda
- Department of Veterinary Hygiene, Veterinary School, Nippon Veterinary & Life Science University, 1-7-1 Kyounan, Musashino, Tokyo, 180-8602, Japan.
| | - Yosuke Uematsu
- Canine Lab., Inc., Nokodai-Tamakoganei Venture Port 302, 2-24-16, Koganei, Tokyo, 184-0012, Japan.
| | - Tomohiro Yamaguchi
- Canine Lab., Inc., Nokodai-Tamakoganei Venture Port 302, 2-24-16, Koganei, Tokyo, 184-0012, Japan.
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24
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Almazán F, Sola I, Zuñiga S, Marquez-Jurado S, Morales L, Becares M, Enjuanes L. Reprint of: Coronavirus reverse genetic systems: infectious clones and replicons. Virus Res 2014; 194:67-75. [PMID: 25261606 PMCID: PMC7114485 DOI: 10.1016/j.virusres.2014.09.006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Coronaviruses (CoVs) infect humans and many animal species, and are associated with respiratory, enteric, hepatic, and central nervous system diseases. The large size of the CoV genome and the instability of some CoV replicase gene sequences during its propagation in bacteria, represent serious obstacles for the development of reverse genetic systems similar to those used for smaller positive sense RNA viruses. To overcome these limitations, several alternatives to more conventional plasmid-based approaches have been established in the last 13 years. In this report, we briefly review and discuss the different reverse genetic systems developed for CoVs, paying special attention to the severe acute respiratory syndrome CoV (SARS-CoV).
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Affiliation(s)
- Fernando Almazán
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Isabel Sola
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Sonia Zuñiga
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Silvia Marquez-Jurado
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Lucia Morales
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Martina Becares
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Luis Enjuanes
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain.
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25
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Thiel V, Thiel HJ, Tekes G. Tackling feline infectious peritonitis via reverse genetics. Bioengineered 2014; 5:396-400. [PMID: 25482087 DOI: 10.4161/bioe.32133] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Feline infectious peritonitis (FIP) is caused by feline coronaviruses (FCoVs) and represents one of the most important lethal infectious diseases of cats. To date, there is no efficacious prevention and treatment, and our limited knowledge on FIP pathogenesis is mainly based on analysis of experiments with field isolates. In a recent study, we reported a promising approach to study FIP pathogenesis using reverse genetics. We generated a set of recombinant FCoVs and investigated their pathogenicity in vivo. The set included the type I FCoV strain Black, a type I FCoV strain Black with restored accessory gene 7b, two chimeric type I/type II FCoVs and the highly pathogenic type II FCoV strain 79-1146. All recombinant FCoVs and the reference strain isolates were found to establish productive infections in cats. While none of the type I FCoVs and chimeric FCoVs induced FIP, the recombinant type II FCoV strain 79-1146 was as pathogenic as the parental isolate. Interestingly, an intact ORF 3c was confirmed to be restored in all viruses (re)isolated from FIP-diseased animals.
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Affiliation(s)
- Volker Thiel
- a Institute of Virology; Justus-Liebig-University Giessen ; Giessen , Germany
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Madhugiri R, Fricke M, Marz M, Ziebuhr J. RNA structure analysis of alphacoronavirus terminal genome regions. Virus Res 2014; 194:76-89. [PMID: 25307890 PMCID: PMC7114417 DOI: 10.1016/j.virusres.2014.10.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 09/30/2014] [Accepted: 10/01/2014] [Indexed: 02/07/2023]
Abstract
Review of current knowledge of cis-acting RNA elements essential to coronavirus replication. Identification of RNA structural elements in alphacoronavirus terminal genome regions. Discussion of intra- and intergeneric conservation of genomic cis-acting RNA elements in alpha- and betacoronaviruses.
Coronavirus genome replication is mediated by a multi-subunit protein complex that is comprised of more than a dozen virally encoded and several cellular proteins. Interactions of the viral replicase complex with cis-acting RNA elements located in the 5′ and 3′-terminal genome regions ensure the specific replication of viral RNA. Over the past years, boundaries and structures of cis-acting RNA elements required for coronavirus genome replication have been extensively characterized in betacoronaviruses and, to a lesser extent, other coronavirus genera. Here, we review our current understanding of coronavirus cis-acting elements located in the terminal genome regions and use a combination of bioinformatic and RNA structure probing studies to identify and characterize putative cis-acting RNA elements in alphacoronaviruses. The study suggests significant RNA structure conservation among members of the genus Alphacoronavirus but also across genus boundaries. Overall, the conservation pattern identified for 5′ and 3′-terminal RNA structural elements in the genomes of alpha- and betacoronaviruses is in agreement with the widely used replicase polyprotein-based classification of the Coronavirinae, suggesting co-evolution of the coronavirus replication machinery with cognate cis-acting RNA elements.
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Affiliation(s)
- Ramakanth Madhugiri
- Institute of Medical Virology, Justus Liebig University Giessen, Schubertstrasse 81, 35392 Giessen, Germany
| | - Markus Fricke
- Faculty of Mathematics and Computer Science, Friedrich Schiller University Jena, Leutragraben 1, 07743 Jena, Germany
| | - Manja Marz
- Faculty of Mathematics and Computer Science, Friedrich Schiller University Jena, Leutragraben 1, 07743 Jena, Germany
| | - John Ziebuhr
- Institute of Medical Virology, Justus Liebig University Giessen, Schubertstrasse 81, 35392 Giessen, Germany.
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Bank-Wolf BR, Stallkamp I, Wiese S, Moritz A, Tekes G, Thiel HJ. Mutations of 3c and spike protein genes correlate with the occurrence of feline infectious peritonitis. Vet Microbiol 2014; 173:177-88. [PMID: 25150756 PMCID: PMC7117521 DOI: 10.1016/j.vetmic.2014.07.020] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 07/18/2014] [Accepted: 07/27/2014] [Indexed: 01/28/2023]
Abstract
The genes encoding accessory proteins 3a, 3b, 3c, 7a and 7b, the S2 domain of the spike (S) protein gene and the membrane (M) protein gene of feline infectious peritonitis virus (FIPV) and feline enteric coronavirus (FECV) samples were amplified, cloned and sequenced. For this faeces and/or ascites samples from 19 cats suffering from feline infectious peritonitis (FIP) as well as from 20 FECV-infected healthy cats were used. Sequence comparisons revealed that 3c genes of animals with FIP were heavily affected by nucleotide deletions and point mutations compared to animals infected with FECV; these alterations resulted either in early termination or destruction of the translation initiation codon. Two ascites-derived samples of cats with FIP which displayed no alterations of ORF3c harboured mutations in the S2 domain of the S protein gene which resulted in amino acid exchanges or deletions. Moreover, changes in 3c were often accompanied by mutations in S2. In contrast, in samples obtained from faeces of healthy cats, the ORF3c was never affected by such mutations. Similarly ORF3c from faecal samples of the cats with FIP was mostly intact and showed only in a few cases the same mutations found in the respective ascites samples. The genes encoding 3a, 3b, 7a and 7b displayed no mutations linked to the feline coronavirus (FCoV) biotype. The M protein gene was found to be conserved between FECV and FIPV samples. Our findings suggest that mutations of 3c and spike protein genes correlate with the occurrence of FIP.
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Affiliation(s)
- Barbara Regina Bank-Wolf
- Institut für Virologie, Fachbereich Veterinärmedizin, Justus-Liebig-Universität Giessen, Biomedizinisches Forschungszentrum Seltersberg, Schubertstrasse 81, 35392 Giessen, Germany
| | - Iris Stallkamp
- Institut für Virologie, Fachbereich Veterinärmedizin, Justus-Liebig-Universität Giessen, Biomedizinisches Forschungszentrum Seltersberg, Schubertstrasse 81, 35392 Giessen, Germany
| | - Svenja Wiese
- Institut für Virologie, Fachbereich Veterinärmedizin, Justus-Liebig-Universität Giessen, Biomedizinisches Forschungszentrum Seltersberg, Schubertstrasse 81, 35392 Giessen, Germany
| | - Andreas Moritz
- Klinik für Kleintiere, Fachbereich Veterinärmedizin, Justus-Liebig-Universität Giessen, Frankfurter Str. 126, 35392 Giessen, Germany
| | - Gergely Tekes
- Institut für Virologie, Fachbereich Veterinärmedizin, Justus-Liebig-Universität Giessen, Biomedizinisches Forschungszentrum Seltersberg, Schubertstrasse 81, 35392 Giessen, Germany
| | - Heinz-Jürgen Thiel
- Institut für Virologie, Fachbereich Veterinärmedizin, Justus-Liebig-Universität Giessen, Biomedizinisches Forschungszentrum Seltersberg, Schubertstrasse 81, 35392 Giessen, Germany.
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McGruder B, Leibowitz JL. A review of genetic methods and models for analysis of coronavirus-induced severe pneumonitis. J Gen Virol 2014; 96:494-506. [PMID: 25252685 PMCID: PMC4811657 DOI: 10.1099/vir.0.069732-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Coronaviruses (CoVs) have been studied for over 60 years, but have only recently gained notoriety as deadly human pathogens with the emergence of severe respiratory syndrome CoV and Middle East respiratory syndrome virus. The rapid emergence of these viruses has demonstrated the need for good models to study severe CoV respiratory infection and pathogenesis. There are, currently, different methods and models for the study of CoV disease. The available genetic methods for the study and evaluation of CoV genetics are reviewed here. There are several animal models, both mouse and alternative animals, for the study of severe CoV respiratory disease that have been examined, each with different pros and cons relative to the actual pathogenesis of the disease in humans. A current limitation of these models is that no animal model perfectly recapitulates the disease seen in humans. Through the review and analysis of the available disease models, investigators can employ the most appropriate available model to study various aspects of CoV pathogenesis and evaluate possible antiviral treatments that may potentially be successful in future treatment and prevention of severe CoV respiratory infections.
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Affiliation(s)
- Brenna McGruder
- Department of Microbial Pathogenesis and Immunology, Texas A & M University Health Science Center, Bryan, TX 77807, USA
| | - Julian L Leibowitz
- Department of Microbial Pathogenesis and Immunology, Texas A & M University Health Science Center, Bryan, TX 77807, USA
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Almazán F, Sola I, Zuñiga S, Marquez-Jurado S, Morales L, Becares M, Enjuanes L. Coronavirus reverse genetic systems: infectious clones and replicons. Virus Res 2014; 189:262-70. [PMID: 24930446 PMCID: PMC4727449 DOI: 10.1016/j.virusres.2014.05.026] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2014] [Revised: 05/27/2014] [Accepted: 05/28/2014] [Indexed: 01/09/2023]
Abstract
Coronaviruses (CoVs) infect humans and many animal species, and are associated with respiratory, enteric, hepatic, and central nervous system diseases. The large size of the CoV genome and the instability of some CoV replicase gene sequences during its propagation in bacteria, represent serious obstacles for the development of reverse genetic systems similar to those used for smaller positive sense RNA viruses. To overcome these limitations, several alternatives to more conventional plasmid-based approaches have been established in the last 13 years. In this report, we briefly review and discuss the different reverse genetic systems developed for CoVs, paying special attention to the severe acute respiratory syndrome CoV (SARS-CoV).
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Affiliation(s)
- Fernando Almazán
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Isabel Sola
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Sonia Zuñiga
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Silvia Marquez-Jurado
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Lucia Morales
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Martina Becares
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain
| | - Luis Enjuanes
- Department of Molecular and Cell Biology. Centro Nacional de Biotecnología (CNB-CSIC), Campus Universidad Autónoma de Madrid, C/ Darwin 3, Cantoblanco, 28049 Madrid, Spain.
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30
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Pedersen NC. An update on feline infectious peritonitis: virology and immunopathogenesis. Vet J 2014; 201:123-32. [PMID: 24837550 PMCID: PMC7110662 DOI: 10.1016/j.tvjl.2014.04.017] [Citation(s) in RCA: 132] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2013] [Revised: 03/24/2014] [Accepted: 04/27/2014] [Indexed: 11/18/2022]
Abstract
Feline infectious peritonitis (FIP) continues to be one of the most researched infectious diseases of cats. The relatively high mortality of FIP, especially for younger cats from catteries and shelters, should be reason enough to stimulate such intense interest. However, it is the complexity of the disease and the grudging manner in which it yields its secrets that most fascinate researchers. Feline leukemia virus infection was conquered in less than two decades and the mysteries of feline immunodeficiency virus were largely unraveled in several years. After a half century, FIP remains one of the last important infections of cats for which we have no single diagnostic test, no vaccine and no definitive explanations for how virus and host interact to cause disease. How can a ubiquitous and largely non-pathogenic enteric coronavirus transform into a highly lethal pathogen? What are the interactions between host and virus that determine both disease form (wet or dry) and outcome (death or resistance)? Why is it so difficult, and perhaps impossible, to develop a vaccine for FIP? What role do genetics play in disease susceptibility? This review will explore research conducted over the last 5 years that attempts to answer these and other questions. Although much has been learned about FIP in the last 5 years, the ultimate answers remain for yet more studies.
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Affiliation(s)
- Niels C Pedersen
- Center for Companion Animal Health, School of Veterinary Medicine, University of California, One Shields Avenue, Davis, CA 95616, USA.
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31
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Borschensky CM, Reinacher M. Mutations in the 3c and 7b genes of feline coronavirus in spontaneously affected FIP cats. Res Vet Sci 2014; 97:333-40. [PMID: 25128417 PMCID: PMC7111757 DOI: 10.1016/j.rvsc.2014.07.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2013] [Revised: 07/17/2014] [Accepted: 07/25/2014] [Indexed: 01/26/2023]
Abstract
ORF 3c is affected by deletions and stop codons more frequently than ORF 7b. Deletions in ORF 3c are not a compelling feature of FIPV. Sequences of different tissue specimens within one cat are mostly identical. PCR amplification of ORF 7b is more efficiently than that of ORF 3c.
Feline infectious peritonitis (FIP) is the most frequent lethal infectious disease in cats. However, understanding of FIP pathogenesis is still incomplete. Mutations in the ORF 3c/ORF 7b genes are proposed to play a role in the occurrence of the fatal FIPV biotype. Here, we investigated 282 tissue specimens from 28 cats that succumbed to FIP. Within one cat, viral sequences from different organs were similar or identical, whereas greater discrepancies were found comparing sequences from various cats. Eleven of the cats exhibited deletions in the 3c gene, resulting in truncated amino acid sequences. The 7b gene was affected by deletions only in one cat. In three of the FIP cats, coronavirus isolates with both intact 3c genes as well as 7b genes of full length could also be detected. Thus, deletions or stop codons in the 3c sequence seem to be a frequent but not compelling feature of FIPVs.
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Affiliation(s)
- C M Borschensky
- Institut für Veterinär-Pathologie, Justus-Liebig-Universität Gießen, 35393 Gießen, Germany.
| | - M Reinacher
- Institut für Veterinär-Pathologie, Justus-Liebig-Universität Gießen, 35393 Gießen, Germany
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32
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Lundin A, Dijkman R, Bergström T, Kann N, Adamiak B, Hannoun C, Kindler E, Jónsdóttir HR, Muth D, Kint J, Forlenza M, Müller MA, Drosten C, Thiel V, Trybala E. Targeting membrane-bound viral RNA synthesis reveals potent inhibition of diverse coronaviruses including the middle East respiratory syndrome virus. PLoS Pathog 2014; 10:e1004166. [PMID: 24874215 PMCID: PMC4038610 DOI: 10.1371/journal.ppat.1004166] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2013] [Accepted: 04/21/2014] [Indexed: 01/20/2023] Open
Abstract
Coronaviruses raise serious concerns as emerging zoonotic viruses without specific antiviral drugs available. Here we screened a collection of 16671 diverse compounds for anti-human coronavirus 229E activity and identified an inhibitor, designated K22, that specifically targets membrane-bound coronaviral RNA synthesis. K22 exerts most potent antiviral activity after virus entry during an early step of the viral life cycle. Specifically, the formation of double membrane vesicles (DMVs), a hallmark of coronavirus replication, was greatly impaired upon K22 treatment accompanied by near-complete inhibition of viral RNA synthesis. K22-resistant viruses contained substitutions in non-structural protein 6 (nsp6), a membrane-spanning integral component of the viral replication complex implicated in DMV formation, corroborating that K22 targets membrane bound viral RNA synthesis. Besides K22 resistance, the nsp6 mutants induced a reduced number of DMVs, displayed decreased specific infectivity, while RNA synthesis was not affected. Importantly, K22 inhibits a broad range of coronaviruses, including Middle East respiratory syndrome coronavirus (MERS–CoV), and efficient inhibition was achieved in primary human epithelia cultures representing the entry port of human coronavirus infection. Collectively, this study proposes an evolutionary conserved step in the life cycle of positive-stranded RNA viruses, the recruitment of cellular membranes for viral replication, as vulnerable and, most importantly, druggable target for antiviral intervention. We expect this mode of action to serve as a paradigm for the development of potent antiviral drugs to combat many animal and human virus infections. Viruses that replicate in the host cell cytoplasm have evolved to employ host cell-derived membranes to compartmentalize genome replication and transcription. Specifically for positive-stranded RNA viruses, accumulating knowledge concerning the involvement, rearrangement and requirement of cellular membranes for RNA synthesis specify the establishment of the viral replicase complex at host cell-derived membranes as an evolutionary conserved and essential step in the early phase of the viral life cycle. Here we describe a small compound inhibitor of coronavirus replication that (i) specifically targets this membrane-bound RNA replication step and (ii) has broad antiviral activity against number of diverse coronaviruses including highly pathogenic SARS-CoV and MERS-CoV. Since resistance mutations appear in an integral membrane-spanning component of the coronavirus replicase complex, and since all positive stranded RNA viruses have very similar membrane-spanning or membrane-associated replicase components implicated in anchoring the viral replication complex to host cell-derived membranes, our data suggest that the membrane-bound replication step of the viral life cycle is a novel, vulnerable, and druggable target for antiviral intervention of a wide range of RNA virus infections.
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Affiliation(s)
- Anna Lundin
- Department of Clinical Virology, University of Gothenburg, Göteborg, Sweden
| | - Ronald Dijkman
- Institute of Immunobiology, Kantonal Hospital St.Gallen, St.Gallen, Switzerland
- Federal Department of Home Affairs, Institute of Virology and Immunology, Berne and Mittelhäusern, Switzerland
| | - Tomas Bergström
- Department of Clinical Virology, University of Gothenburg, Göteborg, Sweden
| | - Nina Kann
- Organic Chemistry, Department of Chemical and Biological Engineering, Chalmers University of Technology, Göteborg, Sweden
| | - Beata Adamiak
- Department of Clinical Virology, University of Gothenburg, Göteborg, Sweden
| | - Charles Hannoun
- Department of Clinical Virology, University of Gothenburg, Göteborg, Sweden
| | - Eveline Kindler
- Institute of Immunobiology, Kantonal Hospital St.Gallen, St.Gallen, Switzerland
- Federal Department of Home Affairs, Institute of Virology and Immunology, Berne and Mittelhäusern, Switzerland
| | - Hulda R. Jónsdóttir
- Institute of Immunobiology, Kantonal Hospital St.Gallen, St.Gallen, Switzerland
- Federal Department of Home Affairs, Institute of Virology and Immunology, Berne and Mittelhäusern, Switzerland
| | - Doreen Muth
- Institute of Virology, University of Bonn Medical Centre, Bonn, Germany
| | - Joeri Kint
- Department of Animal Sciences, Cell Biology and Immunology Group, Wageningen Institute of Animal Sciences, Wageningen University, Wageningen, The Netherlands
- Merck Animal Health, Bioprocess Technology & Support, Boxmeer, The Netherlands
| | - Maria Forlenza
- Department of Animal Sciences, Cell Biology and Immunology Group, Wageningen Institute of Animal Sciences, Wageningen University, Wageningen, The Netherlands
| | - Marcel A. Müller
- Institute of Virology, University of Bonn Medical Centre, Bonn, Germany
| | - Christian Drosten
- Institute of Virology, University of Bonn Medical Centre, Bonn, Germany
| | - Volker Thiel
- Institute of Immunobiology, Kantonal Hospital St.Gallen, St.Gallen, Switzerland
- Federal Department of Home Affairs, Institute of Virology and Immunology, Berne and Mittelhäusern, Switzerland
- Vetsuisse Faculty, University of Berne, Berne, Switzerland
- * E-mail: (VT); (ET)
| | - Edward Trybala
- Department of Clinical Virology, University of Gothenburg, Göteborg, Sweden
- * E-mail: (VT); (ET)
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Feline Coronavirus Infection. CANINE AND FELINE INFECTIOUS DISEASES 2014. [PMCID: PMC7152019 DOI: 10.1016/b978-1-4377-0795-3.00020-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 04/19/2023]
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Bentley K, Armesto M, Britton P. Infectious Bronchitis Virus as a Vector for the Expression of Heterologous Genes. PLoS One 2013; 8:e67875. [PMID: 23840781 PMCID: PMC3694013 DOI: 10.1371/journal.pone.0067875] [Citation(s) in RCA: 13] [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: 03/18/2013] [Accepted: 05/23/2013] [Indexed: 01/31/2023] Open
Abstract
The avian coronavirus infectious bronchitis virus (IBV) is the causative agent of the respiratory disease infectious bronchitis of domestic fowl, and is controlled by routine vaccination. To explore the potential use of IBV as a vaccine vector a reverse genetics system was utilised to generate infectious recombinant IBVs (rIBVs) expressing the reporter genes enhanced green fluorescent protein (eGFP) or humanised Renilla luciferase (hRluc). Infectious rIBVs were obtained following the replacement of Gene 5 or the intergenic region (IR) with eGFP or hRluc, or the replacement of ORFs 3a and 3b with hRluc. The replacement of Gene 5 with an IBV codon-optimised version of the hRluc gene also resulted in successful rescue of infectious rIBV. Reporter gene expression was confirmed by fluorescence microscopy, or luciferase activity assays, for all successfully rescued rIBVs following infection of primary chick kidney (CK) cells. The genetic stability of rIBVs was analysed by serial passage on CK cells. Recombinant IBV stability varied depending on the genome region being replaced, with the reporter genes maintained up to at least passage 8 (P8) following replacement of Gene 5, P7 for replacement of the IR and P5 for replacement of ORFs 3a and 3b. Codon-optimisation of the hRluc gene, when replacing Gene 5, resulted in an increase in genome stability, with hRluc expression stable up to P10 compared to P8 for standard hRluc. Repeated passaging of rIBVs expressing hRluc at an MOI of 0.01 demonstrated an increase in stability, with hRluc expression stable up to at least P12 following the replacement of Gene 5. This study has demonstrated that heterologous genes can be incorporated into, and expressed from a range of IBV genome locations and that replacement of accessory Gene 5 offers a promising target for realising the potential of IBV as a vaccine vector for other avian pathogens.
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Affiliation(s)
- Kirsten Bentley
- Compton Laboratory, Avian Viral Diseases, The Pirbright Institute, Compton, Newbury, Berkshire, United Kingdom
| | - Maria Armesto
- Compton Laboratory, Avian Viral Diseases, The Pirbright Institute, Compton, Newbury, Berkshire, United Kingdom
| | - Paul Britton
- Compton Laboratory, Avian Viral Diseases, The Pirbright Institute, Compton, Newbury, Berkshire, United Kingdom
- * E-mail:
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Full genome analysis of a novel type II feline coronavirus NTU156. Virus Genes 2012; 46:316-22. [PMID: 23239278 PMCID: PMC7089305 DOI: 10.1007/s11262-012-0864-0] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Accepted: 12/03/2012] [Indexed: 01/09/2023]
Abstract
Infections by type II feline coronaviruses (FCoVs) have been shown to be significantly correlated with fatal feline infectious peritonitis (FIP). Despite nearly six decades having passed since its first emergence, different studies have shown that type II FCoV represents only a small portion of the total FCoV seropositivity in cats; hence, there is very limited knowledge of the evolution of type II FCoV. To elucidate the correlation between viral emergence and FIP, a local isolate (NTU156) that was derived from a FIP cat was analyzed along with other worldwide strains. Containing an in-frame deletion of 442 nucleotides in open reading frame 3c, the complete genome size of NTU156 (28,897 nucleotides) appears to be the smallest among the known type II feline coronaviruses. Bootscan analysis revealed that NTU156 evolved from two crossover events between type I FCoV and canine coronavirus, with recombination sites located in the RNA-dependent RNA polymerase and M genes. With an exchange of nearly one-third of the genome with other members of alphacoronaviruses, the new emerging virus could gain new antigenicity, posing a threat to cats that either have been infected with a type I virus before or never have been infected with FCoV.
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36
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Abstract
Feline infectious peritonitis (FIP) is a lethal immunopathological disease caused by feline coronaviruses (FCoVs). Here, we describe a reverse genetics approach to study FIP by assessing the pathogenicity of recombinant type I and type II and chimeric type I/type II FCoVs. All recombinant FCoVs established productive infection in cats, and recombinant type II FCoV (strain 79-1146) induced FIP. Virus sequence analyses from FIP-diseased cats revealed that the 3c gene stop codon of strain 79-1146 has changed to restore a full-length open reading frame (ORF).
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37
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Molecular characterization of feline infectious peritonitis virus strain DF-2 and studies of the role of ORF3abc in viral cell tropism. J Virol 2012; 86:6258-67. [PMID: 22438554 DOI: 10.1128/jvi.00189-12] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
The full-length genome of the highly lethal feline infectious peritonitis virus (FIPV) strain DF-2 was sequenced and cloned into a bacterial artificial chromosome (BAC) to study the role of ORF3abc in the FIPV-feline enteric coronavirus (FECV) transition. The reverse genetic system allowed the replacement of the truncated ORF3abc of the original FIPV DF-2 genome with the intact ORF3abc of the canine coronavirus (CCoV) reference strain Elmo/02. The in vitro replication kinetics of these two viruses was studied in CrFK and FCWF-4 cell lines, as well as in feline peripheral blood monocytes. Both viruses showed similar replication kinetics in established cell lines. However, the strain with a full-length ORF3 showed markedly lower replication of more than 2 log(10) titers in feline peripheral blood monocytes. Our results suggest that the truncated ORF3abc plays an important role in the efficient macrophage/monocyte tropism of type II FIPV.
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Drechsler Y, Alcaraz A, Bossong FJ, Collisson EW, Diniz PPVP. Feline coronavirus in multicat environments. Vet Clin North Am Small Anim Pract 2012; 41:1133-69. [PMID: 22041208 PMCID: PMC7111326 DOI: 10.1016/j.cvsm.2011.08.004] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- Yvonne Drechsler
- College of Veterinary Medicine, Western University of Health Sciences, 309 East Second Street, Pomona, CA 91766-1854, USA
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Abstract
Coronaviruses infect many species of animals including humans, causing acute and chronic diseases. This review focuses primarily on the pathogenesis of murine coronavirus mouse hepatitis virus (MHV) and severe acute respiratory coronavirus (SARS-CoV). MHV is a collection of strains, which provide models systems for the study of viral tropism and pathogenesis in several organs systems, including the central nervous system, the liver, and the lung, and has been cited as providing one of the few animal models for the study of chronic demyelinating diseases such as multiple sclerosis. SARS-CoV emerged in the human population in China in 2002, causing a worldwide epidemic with severe morbidity and high mortality rates, particularly in older individuals. We review the pathogenesis of both viruses and the several reverse genetics systems that made much of these studies possible. We also review the functions of coronavirus proteins, structural, enzymatic, and accessory, with an emphasis on roles in pathogenesis. Structural proteins in addition to their roles in virion structure and morphogenesis also contribute significantly to viral spread in vivo and in antagonizing host cell responses. Nonstructural proteins include the small accessory proteins that are not at all conserved between MHV and SARS-CoV and the 16 conserved proteins encoded in the replicase locus, many of which have enzymatic activities in RNA metabolism or protein processing in addition to functions in antagonizing host response.
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Affiliation(s)
- Susan R Weiss
- Department of Microbiology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, USA
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40
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Takano T, Tomiyama Y, Katoh Y, Nakamura M, Satoh R, Hohdatsu T. Mutation of neutralizing/antibody-dependent enhancing epitope on spike protein and 7b gene of feline infectious peritonitis virus: influences of viral replication in monocytes/macrophages and virulence in cats. Virus Res 2011; 156:72-80. [PMID: 21211540 PMCID: PMC7114493 DOI: 10.1016/j.virusres.2010.12.020] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2010] [Revised: 12/24/2010] [Accepted: 12/29/2010] [Indexed: 11/29/2022]
Abstract
We previously prepared neutralizing monoclonal antibody (MAb)-resistant (mar) mutant viruses using a laboratory strain feline infectious peritonitis virus (FIPV) 79-1146 (Kida et al., 1999). Mar mutant viruses are mutated several amino acids of the neutralizing epitope of Spike protein, compared with the parent strain, FIPV 79-1146. We clarified that MAb used to prepare mar mutant viruses also lost its activity to enhance homologous mar mutant viruses, strongly suggesting that neutralizing and antibody-dependent enhancing epitopes are present in the same region in the strain FIPV 79-1146. We also discovered that amino acid mutation in the neutralizing epitope reduced viral replication in monocytes/macrophages. We also demonstrated that the mutation or deletion of two nucleotides in 7b gene abrogate the virulence of strain FIPV 79-1146.
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Affiliation(s)
- Tomomi Takano
- Laboratory of Veterinary Infectious Disease, School of Veterinary Medicine, Kitasato University, Towada, Aomori 034-8628, Japan
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41
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Abstract
Coronaviruses infect many species of animals including humans, causing acute and chronic diseases. This review focuses primarily on the pathogenesis of murine coronavirus mouse hepatitis virus (MHV) and severe acute respiratory coronavirus (SARS-CoV). MHV is a collection of strains, which provide models systems for the study of viral tropism and pathogenesis in several organs systems, including the central nervous system, the liver, and the lung, and has been cited as providing one of the few animal models for the study of chronic demyelinating diseases such as multiple sclerosis. SARS-CoV emerged in the human population in China in 2002, causing a worldwide epidemic with severe morbidity and high mortality rates, particularly in older individuals. We review the pathogenesis of both viruses and the several reverse genetics systems that made much of these studies possible. We also review the functions of coronavirus proteins, structural, enzymatic, and accessory, with an emphasis on roles in pathogenesis. Structural proteins in addition to their roles in virion structure and morphogenesis also contribute significantly to viral spread in vivo and in antagonizing host cell responses. Nonstructural proteins include the small accessory proteins that are not at all conserved between MHV and SARS-CoV and the 16 conserved proteins encoded in the replicase locus, many of which have enzymatic activities in RNA metabolism or protein processing in addition to functions in antagonizing host response.
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Affiliation(s)
- Susan R Weiss
- Department of Microbiology, University of Pennsylvania, Perelman School of Medicine, Philadelphia, USA
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42
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Jackwood MW, Boynton TO, Hilt DA, McKinley ET, Kissinger JC, Paterson AH, Robertson J, Lemke C, McCall AW, Williams SM, Jackwood JW, Byrd LA. Emergence of a group 3 coronavirus through recombination. Virology 2010; 398:98-108. [PMID: 20022075 PMCID: PMC7111905 DOI: 10.1016/j.virol.2009.11.044] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2009] [Revised: 11/13/2009] [Accepted: 11/24/2009] [Indexed: 01/29/2023]
Abstract
Analyses of turkey coronavirus (TCoV), an enteric disease virus that is highly similar to infectious bronchitis virus (IBV) an upper-respiratory tract disease virus in chickens, were conducted to determine the adaptive potential, and genetic changes associated with emergence of this group 3 coronavirus. Strains of TCoV that were pathogenic in poults and nonpathogenic in chickens did not adapt to cause disease in chickens. Comparative genomics revealed two recombination sites that replaced the spike gene in IBV with an unidentified sequence likely from another coronavirus, resulting in cross-species transmission and a pathogenicity shift. Following emergence in turkeys, TCoV diverged to different serotypes through the accumulation of mutations within spike. This is the first evidence that recombination can directly lead to the emergence of new coronaviruses and new coronaviral diseases, emphasizing the importance of limiting exposure to reservoirs of coronaviruses that can serve as a source of genetic material for emerging viruses.
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Affiliation(s)
- Mark W Jackwood
- Department of Population Health, College of Veterinary Medicine, 953 College Station Road, University of Georgia, Athens, GA 30602, USA.
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43
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Sharif S, Arshad SS, Hair-Bejo M, Omar AR, Zeenathul NA, Fong LS, Rahman NA, Arshad H, Shamsudin S, Isa MKA. Descriptive distribution and phylogenetic analysis of feline infectious peritonitis virus isolates of Malaysia. Acta Vet Scand 2010; 52:1. [PMID: 20053278 PMCID: PMC2828449 DOI: 10.1186/1751-0147-52-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2009] [Accepted: 01/06/2010] [Indexed: 11/10/2022] Open
Abstract
The descriptive distribution and phylogeny of feline coronaviruses (FCoVs) were studied in cats suspected of having feline infectious peritonitis (FIP) in Malaysia. Ascitic fluids and/or biopsy samples were subjected to a reverse transcription polymerase chain reaction (RT-PCR) targeted for a conserved region of 3'untranslated region (3'UTR) of the FCoV genome. Eighty nine percent of the sampled animals were positive for the presence of FCoV. Among the FCoV positive cats, 80% of cats were males and 64% were below 2 years of age. The FCoV positive cases included 56% domestic short hair (DSH), 40% Persian, and 4% Siamese cats. The nucleotide sequences of 10 selected amplified products from FIP cases were determined. The sequence comparison revealed that the field isolates had 96% homology with a few point mutations. The extent of homology decreased to 93% when compared with reference strains. The overall branching pattern of phylogenetic tree showed two distinct clusters, where all Malaysian isolates fall into one main genetic cluster. These findings provided the first genetic information of FCoV in Malaysia.
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Affiliation(s)
- Saeed Sharif
- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Siti S Arshad
- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Mohd Hair-Bejo
- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Abdul R Omar
- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Nazariah A Zeenathul
- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Lau S Fong
- Department of Clinical Studies, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Nor-Alimah Rahman
- University Veterinary Hospital, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Habibah Arshad
- Department of Clinical Studies, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Shahirudin Shamsudin
- Department of Clinical Studies, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
| | - Mohd-Kamarudin A Isa
- Department of Veterinary Pathology and Microbiology, Faculty of Veterinary Medicine, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
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44
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Chimeric feline coronaviruses that encode type II spike protein on type I genetic background display accelerated viral growth and altered receptor usage. J Virol 2009; 84:1326-33. [PMID: 19906918 DOI: 10.1128/jvi.01568-09] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Persistent infection of domestic cats with feline coronaviruses (FCoVs) can lead to a highly lethal, immunopathological disease termed feline infectious peritonitis (FIP). Interestingly, there are two serotypes, type I and type II FCoVs, that can cause both persistent infection and FIP, even though their main determinant of host cell tropism, the spike (S) protein, is of different phylogeny and displays limited sequence identity. In cell culture, however, there are apparent differences. Type II FCoVs can be propagated to high titers by employing feline aminopeptidase N (fAPN) as a cellular receptor, whereas the propagation of type I FCoVs is usually difficult, and the involvement of fAPN as a receptor is controversial. In this study we have analyzed the phenotypes of recombinant FCoVs that are based on the genetic background of type I FCoV strain Black but encode the type II FCoV strain 79-1146 S protein. Our data demonstrate that recombinant FCoVs expressing a type II FCoV S protein acquire the ability to efficiently use fAPN for host cell entry and corroborate the notion that type I FCoVs use another main host cell receptor. We also observed that recombinant FCoVs display a large-plaque phenotype and, unexpectedly, accelerated growth kinetics indistinguishable from that of type II FCoV strain 79-1146. Thus, the main phenotypic differences for type I and type II FCoVs in cell culture, namely, the growth kinetics and the efficient usage of fAPN as a cellular receptor, can be attributed solely to the FCoV S protein.
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45
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Affiliation(s)
- Niels C Pedersen
- Department of Medicine and Epidemiology and Center for Companion Animal Health, School of Veterinary Medicine, University of California, Davis, CA 95616, USA.
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46
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Lorusso A, Decaro N, Schellen P, Rottier PJM, Buonavoglia C, Haijema BJ, de Groot RJ. Gain, preservation, and loss of a group 1a coronavirus accessory glycoprotein. J Virol 2008; 82:10312-7. [PMID: 18667517 PMCID: PMC2566247 DOI: 10.1128/jvi.01031-08] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2008] [Accepted: 07/21/2008] [Indexed: 12/24/2022] Open
Abstract
Coronaviruses are positive-strand RNA viruses of extraordinary genetic complexity and diversity. In addition to a common set of genes for replicase and structural proteins, each coronavirus may carry multiple group-specific genes apparently acquired through relatively recent heterologous recombination events. Here we describe an accessory gene, ORF3, unique to canine coronavirus type I (CCoV-I) and characterize its product, glycoprotein gp3. Whereas ORF3 is conserved in CCoV-I, only remnants remain in CCoV-II and CCoV-II-derived porcine and feline coronaviruses. Our findings provide insight into the evolutionary history of coronavirus group 1a and into the dynamics of gain and loss of accessory genes.
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Affiliation(s)
- Alessio Lorusso
- Virology Division, Department of Infectious Diseases and Immunology, Faculty of Veterinary Medicine, Utrecht University, Yalelaan 1, 3584 CL Utrecht, The Netherlands
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