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Semkum P, Thangthamniyom N, Chankeeree P, Keawborisuth C, Theerawatanasirikul S, Lekcharoensuk P. The Application of the Gibson Assembly Method in the Production of Two pKLS3 Vector-Derived Infectious Clones of Foot-and-Mouth Disease Virus. Vaccines (Basel) 2023; 11:1111. [PMID: 37376500 DOI: 10.3390/vaccines11061111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2023] [Revised: 06/05/2023] [Accepted: 06/15/2023] [Indexed: 06/29/2023] Open
Abstract
The construction of a full-length infectious clone, essential for molecular virological study and vaccine development, is quite a challenge for viruses with long genomes or possessing complex nucleotide sequence structures. Herein, we have constructed infectious clones of foot-and-mouth disease virus (FMDV) types O and A by joining each viral coding region with our pKLS3 vector in a single isothermal reaction using Gibson Assembly (GA). pKLS3 is a 4.3-kb FMDV minigenome. To achieve optimal conditions for the DNA joining, each FMDV coding sequence was divided into two overlapping fragments of approximately 3.8 and 3.2 kb, respectively. Both DNA fragments contain the introduced linker sequences for assembly with the linearized pKLS3 vector. FMDV infectious clones were produced upon directly transfecting the GA reaction into baby hamster kidney-21 (BHK-21) cells. After passing in BHK-21 cells, both rescued FMDVs (rO189 and rNP05) demonstrated growth kinetics and antigenicity similar to their parental viruses. Thus far, this is the first report on GA-derived, full-length infectious FMDV cDNA clones. This simple DNA assembly method and the FMDV minigenome would facilitate the construction of FMDV infectious clones and enable genetic manipulation for FMDV research and custom-made FMDV vaccine production.
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Affiliation(s)
- Ploypailin Semkum
- Department of Microbiology and Immunology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand
- Center for Advanced Studies in Agriculture and Food, KU Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand
| | - Nattarat Thangthamniyom
- Department of Microbiology and Immunology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand
| | - Penpitcha Chankeeree
- Department of Microbiology and Immunology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand
| | - Challika Keawborisuth
- Virology and Cell Technology Research Team, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Pathum Thani 12120, Thailand
| | - Sirin Theerawatanasirikul
- Department of Anatomy, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand
| | - Porntippa Lekcharoensuk
- Department of Microbiology and Immunology, Faculty of Veterinary Medicine, Kasetsart University, Bangkok 10900, Thailand
- Center for Advanced Studies in Agriculture and Food, KU Institute for Advanced Studies, Kasetsart University, Bangkok 10900, Thailand
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Mélade J, Piorkowski G, Bouzidi HS, Medawar A, Raffy C, de Lamballerie X, Nougairède A. Rapid reconstruction of porcine reproductive and respiratory syndrome virus using synthetic DNA fragments. Comput Struct Biotechnol J 2021; 19:5108-5116. [PMID: 34589186 PMCID: PMC8463744 DOI: 10.1016/j.csbj.2021.08.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 08/25/2021] [Accepted: 08/26/2021] [Indexed: 12/02/2022] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is one of the most challenging infectious disease of pig populations causing devastating economic loss to swine industry. Reverse genetics allow to engineer modified viruses such attenuated strains for vaccine development. Some reverse genetic systems were described for PRRSVs but, due to genome complexity of PRRSVs, construction and modification of such systems remain laborious and time-consuming. In this study, we described a reverse genetics approach based on the "Infectious-Subgenomic Amplicons" (ISA) method to rescue infectious PRRSV particles. Permissive cells were transfected with 4 overlapping synthetic DNA fragments covering the entire genome of PRRSV which allowed the rapid reconstruction of the complete virus genome and the subsequent generation of infectious wild-type particles within days. The ISA method represent a rapid alternative of conventional reverse genetic systems. This method will help to generate genetically modified and attenuated strains for the development of sanitary countermeasures in the future.
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Affiliation(s)
- Julien Mélade
- Unité des Virus Émergents (UVE: Aix-Marseille Univ-IRD 190-Inserm 1207), Marseille, France
| | - Géraldine Piorkowski
- Unité des Virus Émergents (UVE: Aix-Marseille Univ-IRD 190-Inserm 1207), Marseille, France
| | - Hawa Sophia Bouzidi
- Unité des Virus Émergents (UVE: Aix-Marseille Univ-IRD 190-Inserm 1207), Marseille, France
- VIRBAC, 1e Avenue, 13ème rue, LID, BP27 - 06511 Carros, France
| | - Alain Medawar
- VIRBAC, 1e Avenue, 13ème rue, LID, BP27 - 06511 Carros, France
| | - Claudine Raffy
- VIRBAC, 1e Avenue, 13ème rue, LID, BP27 - 06511 Carros, France
| | - Xavier de Lamballerie
- Unité des Virus Émergents (UVE: Aix-Marseille Univ-IRD 190-Inserm 1207), Marseille, France
| | - Antoine Nougairède
- Unité des Virus Émergents (UVE: Aix-Marseille Univ-IRD 190-Inserm 1207), Marseille, France
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Zhao M, García B, Gallo A, Tzanetakis IE, Simón-Mateo C, García JA, Pasin F. Home-made enzymatic premix and Illumina sequencing allow for one-step Gibson assembly and verification of virus infectious clones. PHYTOPATHOLOGY RESEARCH 2020; 2:36. [PMID: 33768973 PMCID: PMC7990137 DOI: 10.1186/s42483-020-00077-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Accepted: 11/13/2020] [Indexed: 05/06/2023]
Abstract
An unprecedented number of viruses have been discovered by leveraging advances in high-throughput sequencing. Infectious clone technology is a universal approach that facilitates the study of biology and role in disease of viruses. In recent years homology-based cloning methods such as Gibson assembly have been used to generate virus infectious clones. We detail herein the preparation of home-made cloning materials for Gibson assembly. The home-made materials were used in one-step generation of the infectious cDNA clone of a plant RNA virus into a T-DNA binary vector. The clone was verified by a single Illumina reaction and a de novo read assembly approach that required no primer walking, custom primers or reference sequences. Clone infectivity was finally confirmed by Agrobacterium-mediated delivery to host plants. We anticipate that the convenient home-made materials, one-step cloning and Illumina verification strategies described herein will accelerate characterization of viruses and their role in disease development.
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Affiliation(s)
- Mingmin Zhao
- Centro Nacional de Biotecnología (CNB-CSIC), 28049 Madrid, Spain
- College of Horticulture and Plant Protection, Inner Mongolia Agricultural University, Hohhot 010018, China
| | - Beatriz García
- Centro Nacional de Biotecnología (CNB-CSIC), 28049 Madrid, Spain
| | - Araiz Gallo
- Centro Nacional de Biotecnología (CNB-CSIC), 28049 Madrid, Spain
| | - Ioannis E. Tzanetakis
- Department of Entomology and Plant Pathology, Division of Agriculture, University of Arkansas System, 72701 Fayetteville, USA
| | | | | | - Fabio Pasin
- Centro Nacional de Biotecnología (CNB-CSIC), 28049 Madrid, Spain
- University of Padova, 35122 Padova, Italy
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4
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Porcine Reproductive and Respiratory Syndrome Virus Reverse Genetics and the Major Applications. Viruses 2020; 12:v12111245. [PMID: 33142752 PMCID: PMC7692847 DOI: 10.3390/v12111245] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 10/15/2020] [Accepted: 10/28/2020] [Indexed: 02/06/2023] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) is a positive sense, single-stranded RNA virus that is known to infect only pigs. The virus emerged in the late 1980s and became endemic in most swine producing countries, causing substantial economic losses to the swine industry. The first reverse genetics system for PRRSV was reported in 1998. Since then, several infectious cDNA clones for PRRSV have been constructed. The availability of these infectious cDNA clones has facilitated the genetic modifications of the viral genome at precise locations. Common approaches to manipulate the viral genome include site-directed mutagenesis, deletion of viral genes or gene fragments, insertion of foreign genes, and swapping genes between PRRSV strains or between PRRSV and other members of the Arteriviridae family. In this review, we describe the approaches to construct an infectious cDNA for PRRSV and the ten major applications of these infectious clones to study virus biology and virus–host interaction, and to design a new generation of vaccines with improved levels of safety and efficacy.
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Velazquez-Salinas L, Pauszek SJ, Barrera J, Clark BA, Borca MV, Verdugo-Rodriguez A, Stenfeldt C, Arzt J, Rodriguez LL. Validation of a site-specific recombination cloning technique for the rapid development of a full-length cDNA clone of a virulent field strain of vesicular stomatitis New Jersey virus. J Virol Methods 2019; 265:113-116. [PMID: 30639413 DOI: 10.1016/j.jviromet.2019.01.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 12/30/2018] [Accepted: 01/08/2019] [Indexed: 10/27/2022]
Abstract
This study reports the use of a site-specific recombination cloning technique for rapid development of a full-length cDNA clone that can produce infectious vesicular stomatitis New Jersey virus (VSNJV). The full-length genome of the epidemic VSNJV NJ0612NME6 strain was amplified in four overlapping cDNA fragments which were linked together and cloned into a vector plasmid by site-specific recombination. Furthermore, to derive infectious virus, three supporting plasmid vectors containing either the nucleoprotein (N), phosphoprotein (P) or polymerase (L) genes were constructed using the same cloning methodology. Recovery of recombinant VSNJV was achieved after transfecting all four vectors on into BSR-T7/5 cells, a BHK-derived cell line stably expressing T7 RNA polymerase (PMID: 9847328). In vitro characterization of recombinant and parental viruses revealed similar growth kinetics and plaque morphologies. Furthermore, experimental infection of pigs with the recombinant virus resulted in severe vesicular stomatitis with clinical signs similar to those previously reported for the parental field strain. These results validate the use of site-directed specific recombination cloning as a useful alternative method for rapid construction of stable full-length cDNA clones from vesicular stomatitis field strains. The approach reported herein contributes to the improvement of previously published methodologies for the development of full-length cDNA clones of this relevant virus.
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Affiliation(s)
- Lauro Velazquez-Salinas
- Foreign Animal Disease Research Unit, USDA/ARS Plum Island Animal Disease Center, PO Box 848, Greenport NY 11944, USA; National Autonomous University of Mexico, College of Veterinary Medicine and Animal Science, Mexico; Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - Steven J Pauszek
- Foreign Animal Disease Research Unit, USDA/ARS Plum Island Animal Disease Center, PO Box 848, Greenport NY 11944, USA
| | - Jose Barrera
- Leidos, Plum Island Animal Disease Center, P.O. Box 848, Greenport NY 11944, USA
| | - Benjamin A Clark
- Oak Ridge Institute for Science and Education, PIADC Research Participation Program, Oak Ridge, TN, USA
| | - Manuel V Borca
- Foreign Animal Disease Research Unit, USDA/ARS Plum Island Animal Disease Center, PO Box 848, Greenport NY 11944, USA
| | | | - Carolina Stenfeldt
- Foreign Animal Disease Research Unit, USDA/ARS Plum Island Animal Disease Center, PO Box 848, Greenport NY 11944, USA
| | - Jonathan Arzt
- Foreign Animal Disease Research Unit, USDA/ARS Plum Island Animal Disease Center, PO Box 848, Greenport NY 11944, USA
| | - Luis L Rodriguez
- Foreign Animal Disease Research Unit, USDA/ARS Plum Island Animal Disease Center, PO Box 848, Greenport NY 11944, USA.
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Wongthida P, Liwnaree B, Wanasen N, Narkpuk J, Jongkaewwattana A. The role of ORF3 accessory protein in replication of cell-adapted porcine epidemic diarrhea virus (PEDV). Arch Virol 2017; 162:2553-2563. [PMID: 28474223 DOI: 10.1007/s00705-017-3390-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 04/19/2017] [Indexed: 12/01/2022]
Abstract
The ORF3 accessory protein has been shown to impede reverse genetics of cell-culture-adapted porcine epidemic diarrhea virus (PEDV). Its absence or truncated variants are also associated with viral attenuation in vivo. Here, three ORF3 variants (ORF3NP12, ORF3NP14 and ORF3RB14) and their truncated counterparts were investigated for their regulatory role in recovery of cell-adapted PEDV in vitro. We demonstrate that ORF3NP12, but not the truncated form, can inhibit recovery of reverse-genetics-derived PEDV when expressed in trans. When testing with other RNA viruses, ORF3 was found to inhibit rescue of porcine respiratory and reproductive syndrome virus (PRRSV), but not of influenza virus. Interestingly, results from mutagenesis of ORF3NP12 suggest that F81 and M167 are responsible for impairing PEDV rescue in vitro. By changing specific residues of ORF3, the recombinant PEDV bearing the modified ORF3NP12 can be productively propagated in VeroE6-APN cells. These results may provide mechanistic insights into ORF3-mediated inhibition of PEDV replication in new host cells.
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Affiliation(s)
- Phonphimon Wongthida
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Rd., Klong Nueng, Klong Luang, Pathum Thani, 12120, Thailand
| | - Benjamas Liwnaree
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Rd., Klong Nueng, Klong Luang, Pathum Thani, 12120, Thailand
| | - Nanchaya Wanasen
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Rd., Klong Nueng, Klong Luang, Pathum Thani, 12120, Thailand
| | - Jaraspim Narkpuk
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Rd., Klong Nueng, Klong Luang, Pathum Thani, 12120, Thailand
| | - Anan Jongkaewwattana
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), 113 Thailand Science Park, Phahonyothin Rd., Klong Nueng, Klong Luang, Pathum Thani, 12120, Thailand.
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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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Tuo D, Shen W, Yan P, Li X, Zhou P. Rapid Construction of Stable Infectious Full-Length cDNA Clone of Papaya Leaf Distortion Mosaic Virus Using In-Fusion Cloning. Viruses 2015; 7:6241-50. [PMID: 26633465 PMCID: PMC4690859 DOI: 10.3390/v7122935] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 11/18/2015] [Accepted: 11/19/2015] [Indexed: 12/27/2022] Open
Abstract
Papaya leaf distortion mosaic virus (PLDMV) is becoming a threat to papaya and transgenic papaya resistant to the related pathogen, papaya ringspot virus (PRSV). The generation of infectious viral clones is an essential step for reverse-genetics studies of viral gene function and cross-protection. In this study, a sequence- and ligation-independent cloning system, the In-Fusion® Cloning Kit (Clontech, Mountain View, CA, USA), was used to construct intron-less or intron-containing full-length cDNA clones of the isolate PLDMV-DF, with the simultaneous scarless assembly of multiple viral and intron fragments into a plasmid vector in a single reaction. The intron-containing full-length cDNA clone of PLDMV-DF was stably propagated in Escherichia coli.In vitro intron-containing transcripts were processed and spliced into biologically active intron-less transcripts following mechanical inoculation and then initiated systemic infections in Carica papaya L. seedlings, which developed similar symptoms to those caused by the wild-type virus. However, no infectivity was detected when the plants were inoculated with RNA transcripts from the intron-less construct because the instability of the viral cDNA clone in bacterial cells caused a non-sense or deletion mutation of the genomic sequence of PLDMV-DF. To our knowledge, this is the first report of the construction of an infectious full-length cDNA clone of PLDMV and the splicing of intron-containing transcripts following mechanical inoculation. In-Fusion cloning shortens the construction time from months to days. Therefore, it is a faster, more flexible, and more efficient method than the traditional multistep restriction enzyme-mediated subcloning procedure.
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Affiliation(s)
- Decai Tuo
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China.
| | - Wentao Shen
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China.
| | - Pu Yan
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China.
| | - Xiaoying Li
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China.
| | - Peng Zhou
- Key Laboratory of Biology and Genetic Resources of Tropical Crops, Ministry of Agriculture, Institute of Tropical Bioscience and Biotechnology, Chinese Academy of Tropical Agricultural Sciences, Haikou 571101, China.
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Construction of infectious cDNA clone derived from a classical swine fever virus field isolate in BAC vector using in vitro overlap extension PCR and recombination. J Virol Methods 2015; 226:60-6. [DOI: 10.1016/j.jviromet.2015.10.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Revised: 09/26/2015] [Accepted: 10/13/2015] [Indexed: 11/19/2022]
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Blawid R, Nagata T. Construction of an infectious clone of a plant RNA virus in a binary vector using one-step Gibson Assembly. J Virol Methods 2015; 222:11-5. [PMID: 25986144 DOI: 10.1016/j.jviromet.2015.05.003] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 05/06/2015] [Accepted: 05/07/2015] [Indexed: 11/29/2022]
Abstract
The construction of full-length infectious clones of RNA viruses is often laborious due to the many cloning steps required and the DNA exclusion within the plasmid during Escherichia coli transformation. We demonstrate single-step cloning procedure of an infectious cDNA of the tomato blistering mosaic virus (ToBMV) using Gibson Assembly (GA), which drastically reduces the number of cloning steps. By agro-inoculation with the construct obtained by this procedure, ToBMV was recovered six days post-inoculation in Nicotiana benthamiana plants. The symptoms induced by the recovered virus were indistinguishable from those caused by the wild-type virus. We conclude that the GA is very useful method particularly to construct a full-length cDNA clone of a plant RNA virus in a binary vector.
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Affiliation(s)
- Rosana Blawid
- Universidade de Brasília, Department of Cell Biology, Campus Universitário Darcy Ribeiro, 70910-900 Brasília, DF, Brazil
| | - Tatsuya Nagata
- Universidade de Brasília, Department of Cell Biology, Campus Universitário Darcy Ribeiro, 70910-900 Brasília, DF, Brazil.
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Bordat A, Houvenaghel MC, German-Retana S. Gibson assembly: an easy way to clone potyviral full-length infectious cDNA clones expressing an ectopic VPg. Virol J 2015; 12:89. [PMID: 26070311 PMCID: PMC4475333 DOI: 10.1186/s12985-015-0315-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 05/29/2015] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND Approaches to simplify and accelerate the construction of full-length infectious cDNA clones for plant potyviruses have been described, based on cloning strategies involving in vitro ligation or homologous recombination in yeast. In the present study, we developed a faster and more efficient in vitro recombination system using Gibson assembly (GA), to engineer a Lettuce mosaic virus (LMV) infectious clone expressing an ectopic mcherry-tagged VPg (Viral protein genome-linked) for in planta subcellular localization of the viral protein in an infection context. METHODS Three overlapping long distance PCR fragments were amplified and assembled in a single-step process based on in vitro recombination (Gibson assembly). The resulting 17.5 kbp recombinant plasmids (LMVmchVPg_Ec) were inoculated by biolistic on lettuce plants and then propagated mechanically on Nicotiana benthamiana. Confocal microscopy was used to analyze the subcellular localization of the ectopically expressed mcherry-VPg fusion protein. RESULTS The Gibson assembly allowed the cloning of the expected plasmids without any deletion. All the inoculated plants displayed symptoms characteristic of LMV infection. The majority of the mcherry fluorescent signal observed using confocal microscopy was located in the nucleus and nucleolus as expected for a potyviral VPg. CONCLUSIONS This is the first report of the use of the Gibson assembly method to construct full-length infectious cDNA clones of a potyvirus genome. This is also the first description of the ectopic expression of a tagged version of a potyviral VPg without affecting the viability of the recombinant potyvirus.
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Affiliation(s)
- Amandine Bordat
- INRA, UMR 1332 de Biologie du Fruit et Pathologie, CS 20032, 33882, Villenave d'Ornon, France.
- Université de Bordeaux, UMR 1332 de Biologie du Fruit et Pathologie, CS 20032, 33882, Villenave d'Ornon, France.
| | - Marie-Christine Houvenaghel
- INRA, UMR 1332 de Biologie du Fruit et Pathologie, CS 20032, 33882, Villenave d'Ornon, France.
- Université de Bordeaux, UMR 1332 de Biologie du Fruit et Pathologie, CS 20032, 33882, Villenave d'Ornon, France.
| | - Sylvie German-Retana
- INRA, UMR 1332 de Biologie du Fruit et Pathologie, CS 20032, 33882, Villenave d'Ornon, France.
- Université de Bordeaux, UMR 1332 de Biologie du Fruit et Pathologie, CS 20032, 33882, Villenave d'Ornon, France.
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