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Lee SC, Pai H, Huang YW, He MH, Song YL, Kuo SY, Chang WC, Hsu YH, Lin NS. Exploring the Multifunctional Roles of Odontoglossum Ringspot Virus P126 in Facilitating Cymbidium Mosaic Virus Cell-to-Cell Movement during Mixed Infection. Viruses 2021; 13:1552. [PMID: 34452417 PMCID: PMC8402721 DOI: 10.3390/v13081552] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 07/31/2021] [Accepted: 08/02/2021] [Indexed: 12/11/2022] Open
Abstract
Synergistic interactions among viruses, hosts and/or transmission vectors during mixed infection can alter viral titers, symptom severity or host range. Viral suppressors of RNA silencing (VSRs) are considered one of such factors contributing to synergistic responses. Odontoglossum ringspot virus (ORSV) and cymbidium mosaic virus (CymMV), which are two of the most significant orchid viruses, exhibit synergistic symptom intensification in Phalaenopsis orchids with unilaterally enhanced CymMV movement by ORSV. In order to reveal the underlying mechanisms, we generated infectious cDNA clones of ORSV and CymMV isolated from Phalaenopsis that exerted similar unilateral synergism in both Phalaenopsis orchid and Nicotiana benthamiana. Moreover, we show that the ORSV replicase P126 is a VSR. Mutagenesis analysis revealed that mutation of the methionine in the carboxyl terminus of ORSV P126 abolished ORSV replication even though some P126 mutants preserved VSR activity, indicating that the VSR function of P126 alone is not sufficient for viral replication. Thus, P126 functions in both ORSV replication and as a VSR. Furthermore, P126 expression enhanced cell-to-cell movement and viral titers of CymMV in infected Phalaenopsis flowers and N. benthamiana leaves. Taking together, both the VSR and protein function of P126 might be prerequisites for unilaterally enhancing CymMV cell-to-cell movement by ORSV.
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Affiliation(s)
- Shu-Chuan Lee
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei 11529, Taiwan; (S.-C.L.); (H.P.); (M.-H.H.); (Y.-L.S.)
| | - Hsuan Pai
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei 11529, Taiwan; (S.-C.L.); (H.P.); (M.-H.H.); (Y.-L.S.)
| | - Ying-Wen Huang
- Graduate Institute of Biotechnology, National Chung Hsing University, Taichung 40227, Taiwan; (Y.-W.H.); (S.-Y.K.); (Y.-H.H.)
| | - Meng-Hsun He
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei 11529, Taiwan; (S.-C.L.); (H.P.); (M.-H.H.); (Y.-L.S.)
| | - Yun-Lin Song
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei 11529, Taiwan; (S.-C.L.); (H.P.); (M.-H.H.); (Y.-L.S.)
| | - Song-Yi Kuo
- Graduate Institute of Biotechnology, National Chung Hsing University, Taichung 40227, Taiwan; (Y.-W.H.); (S.-Y.K.); (Y.-H.H.)
| | - Wen-Chi Chang
- College of Biosciences and Biotechnology, Institute of Tropical Plant Sciences, National Cheng Kung University, Tainan 70101, Taiwan;
| | - Yau-Heiu Hsu
- Graduate Institute of Biotechnology, National Chung Hsing University, Taichung 40227, Taiwan; (Y.-W.H.); (S.-Y.K.); (Y.-H.H.)
| | - Na-Sheng Lin
- Institute of Plant and Microbial Biology, Academia Sinica, Taipei 11529, Taiwan; (S.-C.L.); (H.P.); (M.-H.H.); (Y.-L.S.)
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Kannan M, Zainal Z, Ismail I, Baharum SN, Bunawan H. Application of Reverse Genetics in Functional Genomics of Potyvirus. Viruses 2020; 12:v12080803. [PMID: 32722532 PMCID: PMC7472138 DOI: 10.3390/v12080803] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 07/12/2020] [Accepted: 07/14/2020] [Indexed: 12/16/2022] Open
Abstract
Numerous potyvirus studies, including virus biology, transmission, viral protein function, as well as virus–host interaction, have greatly benefited from the utilization of reverse genetic techniques. Reverse genetics of RNA viruses refers to the manipulation of viral genomes, transfection of the modified cDNAs into cells, and the production of live infectious progenies, either wild-type or mutated. Reverse genetic technology provides an opportunity of developing potyviruses into vectors for improving agronomic traits in plants, as a reporter system for tracking virus infection in hosts or a production system for target proteins. Therefore, this review provides an overview on the breakthroughs achieved in potyvirus research through the implementation of reverse genetic systems.
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Affiliation(s)
- Maathavi Kannan
- Institute of Systems Biology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia; (M.K.); (Z.Z.); (I.I.); (S.N.B.)
| | - Zamri Zainal
- Institute of Systems Biology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia; (M.K.); (Z.Z.); (I.I.); (S.N.B.)
- Department of Biological Sciences and Biotechnology, Faculty of Science and Technology, University Kebangsaan Malaysia, Bangi 43600, Malaysia
| | - Ismanizan Ismail
- Institute of Systems Biology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia; (M.K.); (Z.Z.); (I.I.); (S.N.B.)
- Department of Biological Sciences and Biotechnology, Faculty of Science and Technology, University Kebangsaan Malaysia, Bangi 43600, Malaysia
| | - Syarul Nataqain Baharum
- Institute of Systems Biology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia; (M.K.); (Z.Z.); (I.I.); (S.N.B.)
| | - Hamidun Bunawan
- Institute of Systems Biology, Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia; (M.K.); (Z.Z.); (I.I.); (S.N.B.)
- Correspondence: ; Tel.: +60-3-8921-4554
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Yu M, Liu H, Zheng H, Yan F, Zhao X, Xia Z, An M, Wu Y. Viral sequences required for efficient viral infection differ between two Chinese pepper mild mottle virus isolates. Virus Res 2019; 267:9-15. [PMID: 31039366 DOI: 10.1016/j.virusres.2019.04.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2019] [Revised: 04/18/2019] [Accepted: 04/21/2019] [Indexed: 11/16/2022]
Abstract
Pepper mild mottle virus (PMMoV) causes mosaic symptoms and malformation on both leaf and fruit of pepper, reduces considerable economical yields and poses threats to human health. In this study, infectious clone of PMMoV Huludao (HLD) isolate (pCB-PMMoV-HLD) was constructed and its infectious ablility in Nicotiana benthamiana was confirmed by virions observation and Northern blot analysis. The mutant PMMoV (HLD-fsCP) that cannot express coat protein (CP) showed reduced viral accumulation but can systemically infect N. benthamiana. We constructed several chimeric mutant viruses (ZA-HB-HC, HA-ZB-HC, HA-HB-ZC and HA-ZB-ZC) by sequences substitution between PMMoV-HLD and PMMoV Zhejiang isolates (PMMoV-ZJ) and analyzed their infectious abilities in N. benthamiana and Capsicum annuum. The results showed that the chimera virus expressed by pCB-ZA-HB-HC, pCB-HA-HB-ZC and pCB-HA-ZB-ZC, but not by pCB-HA-ZB-HC, exhibited reduced infectious ability compared with wild-type PMMoV-ZJ and PMMoV-HLD, which indicated that RNA sequences required for efficient infection of PMMoV differ between the two virus isolates. The differential requirement of viral RNA sequences for efficient PMMoV infection provided theoretical value to further understand the infection and pathogenesis of PMMoV.
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Affiliation(s)
- Man Yu
- College of Plant Protection, Shenyang Agricultural University, Shenyang, 110866, China
| | - He Liu
- College of Plant Protection, Shenyang Agricultural University, Shenyang, 110866, China
| | - Hongying Zheng
- Institute of Plant Virology, Ningbo University, Ningbo, 315200, China
| | - Fei Yan
- Institute of Plant Virology, Ningbo University, Ningbo, 315200, China
| | - Xiuxiang Zhao
- College of Plant Protection, Shenyang Agricultural University, Shenyang, 110866, China
| | - Zihao Xia
- College of Plant Protection, Shenyang Agricultural University, Shenyang, 110866, China
| | - Mengnan An
- College of Plant Protection, Shenyang Agricultural University, Shenyang, 110866, China.
| | - Yuanhua Wu
- College of Plant Protection, Shenyang Agricultural University, Shenyang, 110866, China.
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Tarquini G, Zaina G, Ermacora P, De Amicis F, Franco-Orozco B, Loi N, Martini M, Bianchi GL, Pagliari L, Firrao G, de Paoli E, Musetti R. Agroinoculation of Grapevine Pinot Gris Virus in tobacco and grapevine provides insights on viral pathogenesis. PLoS One 2019; 14:e0214010. [PMID: 30889228 PMCID: PMC6424481 DOI: 10.1371/journal.pone.0214010] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Accepted: 03/05/2019] [Indexed: 12/27/2022] Open
Abstract
The Grapevine Pinot Gris disease (GPG-d) is a novel disease characterized by symptoms such as leaf mottling and deformation, which has been recently reported in grapevines, and mostly in Pinot gris. Plants show obvious symptoms at the beginning of the growing season, while during summer symptom recovery frequently occurs, manifesting as symptomless leaves. A new Trichovirus, named Grapevine Pinot gris virus (GPGV), which belongs to the family Betaflexiviridae was found in association with infected plants. The detection of the virus in asymptomatic grapevines raised doubts about disease aetiology. Therefore, the primary target of this work was to set up a reliable system for the study of the disease in controlled conditions, avoiding interfering factor(s) that could affect symptom development. To this end, two clones of the virus, pRI::GPGV-vir and pRI::GPGV-lat, were generated from total RNA collected from one symptomatic and one asymptomatic Pinot gris grapevine, respectively. The clones, which encompassed the entire genome of the virus, were used in Agrobacterium-mediated inoculation of Vitis vinifera and Nicotiana benthamiana plants. All inoculated plants developed symptoms regardless of their inoculum source, demonstrating a correlation between the presence of GPGV and symptomatic manifestations. Four months post inoculum, the grapevines inoculated with the pRI::GPGV-lat clone developed asymptomatic leaves that were still positive to GPGV detection. Three to four weeks later (i.e. ca. 5 months post inoculum), the same phenomenon was observed in the grapevines inoculated with pRI::GPGV-vir. This observation perfectly matches symptom progression in infected field-grown grapevines, suggesting a possible role for plant antiviral mechanisms, such as RNA silencing, in the recovery process.
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Affiliation(s)
- Giulia Tarquini
- Department of Agriculture, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
| | - Giusi Zaina
- Department of Agriculture, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
| | - Paolo Ermacora
- Department of Agriculture, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
| | | | - Barbara Franco-Orozco
- Department of Agriculture, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
| | - Nazia Loi
- Department of Agriculture, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
| | - Marta Martini
- Department of Agriculture, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
| | | | - Laura Pagliari
- Department of Agriculture, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
| | - Giuseppe Firrao
- Department of Agriculture, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
| | - Emanuele de Paoli
- Department of Agriculture, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
| | - Rita Musetti
- Department of Agriculture, Food, Environmental and Animal Sciences, University of Udine, Udine, Italy
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Tran PT, Fang M, Widyasari K, Kim KH. A plant intron enhances the performance of an infectious clone in planta. J Virol Methods 2019; 265:26-34. [PMID: 30578897 DOI: 10.1016/j.jviromet.2018.12.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 12/18/2018] [Accepted: 12/18/2018] [Indexed: 01/13/2023]
Abstract
Although infectious clones are fundamental tools in virology and plant pathology, their efficacy is often reduced by the instability of viral sequences in Escherichia coli. In this study, we constructed an infectious clone of PepMoV (pPepMoV) in a bacterial binary vector (pSNU1); the clone induces symptoms of PepMoV in agroinfiltrated plants. During its modification and maintenance in E. coli, however, the pPepMoV infectious clone was instable in the bacteria. Manipulation of this unstable clone in the bacterial strain DH10B led to the spontaneous formation of a recombined clone with high stability in the bacteria but with reduced infectivity due to an unwanted insertion of an E. coli sequence in the NIa-protease coding region. Replacement of this sequence with a plant intron restored infectivity and maintained plasmid stability. In addition to restoring plasmid growth in both E. coli and Agrobacterium, the presence of the intron in the PepMoV sequence enhanced the accumulation of PepMoV in agroinfiltrated leaves and resulted in symptom induction in upper systemic leaves that was nearly as strong as with PepMoV sap-inoculation. Plant introns have been previously used to stabilize plasmids in E. coli without any effect or with an unexpected lag in symptom development. In contrast, the current results demonstrated the in vivo enhancement of an infectious clone by a plant intron.
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Affiliation(s)
- Phu-Tri Tran
- Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea; Plant Genomics and Breeding Institute, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Miao Fang
- Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Kristin Widyasari
- Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea
| | - Kook-Hyung Kim
- Department of Agricultural Biotechnology, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea; Plant Genomics and Breeding Institute, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea; Research Institute of Agriculture and Life Sciences, College of Agriculture and Life Sciences, Seoul National University, Seoul 08826, Republic of Korea.
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6
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Vasques RM, Lacorte C, da Luz LL, Aranda MA, Nagata T. Development of a new tobamovirus-based viral vector for protein expression in plants. Mol Biol Rep 2018; 46:97-103. [PMID: 30367403 DOI: 10.1007/s11033-018-4449-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Accepted: 10/16/2018] [Indexed: 01/10/2023]
Abstract
Plants are becoming an interesting alternative system for the heterologous production of pharmaceutical proteins, providing a more scalable, cost-effective, and biologically safer option than the current expression systems. The development of plant virus expression vectors has allowed rapid and high-level transient expression of recombinant genes, and, in turn, provided an attractive plant-based production platform. Here we report the development of vectors based on the tobamovirus Pepper mild mottle virus (PMMoV) to be used in transient expression of foreign genes. In this PMMoV vector, a middle part of the viral coat protein gene was replaced by the green fluorescent protein (GFP) gene, and this recombinant genome was assembled in a binary vector suitable for plant agroinoculation. The accumulation of GFP was evaluated by observation of green fluorescent signals under UV light and by western blotting. Furthermore, by using this vector, the multiepitope gene for chikungunya virus was successfully expressed and confirmed by western blotting. This PMMoV-based vector represents an alternative system for a high-level production of heterologous protein in plants.
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Affiliation(s)
- Raquel Medeiros Vasques
- Departamento de Biologia Celular, Universidade de Brasília, Campus Darcy Ribeiro, Brasília, DF, 70910-900, Brazil
| | - Cristiano Lacorte
- Embrapa Recursos Genéticos e Biotecnologia, Brasília, DF, 70297-400, Brazil
| | - Leonardo Lopes da Luz
- Departamento de Biologia Celular, Universidade de Brasília, Campus Darcy Ribeiro, Brasília, DF, 70910-900, Brazil
| | - Miguel A Aranda
- Centro de Edafología y Biología Aplicada del Segura (CEBAS), Consejo Superior de Investigaciones Científicas (CSIC), 30100, Murcia, Spain
| | - Tatsuya Nagata
- Departamento de Biologia Celular, Universidade de Brasília, Campus Darcy Ribeiro, Brasília, DF, 70910-900, Brazil.
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Park CH, Ju HK, Han JY, Park JS, Kim IH, Seo EY, Kim JK, Hammond J, Lim HS. Complete nucleotide sequences and construction of full-length infectious cDNA clones of cucumber green mottle mosaic virus (CGMMV) in a versatile newly developed binary vector including both 35S and T7 promoters. Virus Genes 2017; 53:286-299. [PMID: 27913980 DOI: 10.1007/s11262-016-1415-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2016] [Accepted: 11/24/2016] [Indexed: 11/28/2022]
Abstract
Seed-transmitted viruses have caused significant damage to watermelon crops in Korea in recent years, with cucumber green mottle mosaic virus (CGMMV) infection widespread as a result of infected seed lots. To determine the likely origin of CGMMV infection, we collected CGMMV isolates from watermelon and melon fields and generated full-length infectious cDNA clones. The full-length cDNAs were cloned into newly constructed binary vector pJY, which includes both the 35S and T7 promoters for versatile usage (agroinfiltration and in vitro RNA transcription) and a modified hepatitis delta virus ribozyme sequence to precisely cleave RNA transcripts at the 3' end of the tobamovirus genome. Three CGMMV isolates (OMpj, Wpj, and Mpj) were separately evaluated for infectivity in Nicotiana benthamiana, demonstrated by either Agroinfiltration or inoculation with in vitro RNA transcripts. CGMMV nucleotide identities to other tobamoviruses were calculated from pairwise alignments using DNAMAN. CGMMV identities were 49.89% to tobacco mosaic virus; 49.85% to pepper mild mottle virus; 50.47% to tomato mosaic virus; 60.9% to zucchini green mottle mosaic virus; and 60.96% to kyuri green mottle mosaic virus, confirming that CGMMV is a distinct species most similar to other cucurbit-infecting tobamoviruses. We further performed phylogenetic analysis to determine relationships of our new Korean CGMMV isolates to previously characterized isolates from Canada, China, India, Israel, Japan, Korea, Russia, Spain, and Taiwan available from NCBI. Analysis of CGMMV amino acid sequences showed three major clades, broadly typified as 'Russian,' 'Israeli,' and 'Asian' groups. All of our new Korean isolates fell within the 'Asian' clade. Neither the 128 nor 186 kDa RdRps of the three new isolates showed any detectable gene silencing suppressor function.
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Affiliation(s)
- Chan-Hwan Park
- Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon, 34134, Korea
| | - Hye-Kyoung Ju
- Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon, 34134, Korea
| | - Jae-Yeong Han
- Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon, 34134, Korea
| | - Jong-Seo Park
- Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon, 34134, Korea
| | - Ik-Hyun Kim
- Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon, 34134, Korea
| | - Eun-Young Seo
- Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon, 34134, Korea
| | - Jung-Kyu Kim
- Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon, 34134, Korea
| | - John Hammond
- United States Department of Agriculture - Agricultural Research Service, United States National Arboretum, Floral and Nursery Plants Research Unit, Beltsville, MD, 20705, USA.
| | - Hyoun-Sub Lim
- Department of Applied Biology, College of Agriculture and Life Sciences, Chungnam National University, Daejeon, 34134, Korea.
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Carvalho SL, Nagata T, Junqueira BR, Zanardo LG, Paiva ACS, Carvalho CM. Construction of a full-length infectious cDNA clone of Cowpea mild mottle virus. Virus Genes 2017; 53:137-140. [PMID: 27730428 DOI: 10.1007/s11262-016-1395-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2016] [Accepted: 09/22/2016] [Indexed: 11/30/2022]
Abstract
Infectious cDNA clones are an important tool to study the molecular and cellular process of RNA virus infection. In vitro and in vivo transcription systems are the two main strategies used in the generation of infectious cDNA clones for RNA viruses. This study describes the first generation of a full-length infectious cDNA clone of Cowpea mild mottle virus (CPMMV), a Carlavirus. The full-length genome was synthesized by Overlap Extension PCR of two overlapping fragments and cloned in a pUC-based vector under control of the SP6 RNA polymerase promoter. After in vitro run-off transcription, the produced RNA was mechanically inoculated into soybean plants cv. CD206. The systemic infection was confirmed by RT-PCR and further sequencing of amplified cDNA fragments. To simplify the transfection process, the complete genome was subcloned into a binary vector under control of the 35S promoter of cauliflower mosaic virus by the Gibson Assembly protocol. The resulting clones were inoculated by particle bombardment onto soybean seedlings and the recovery of the virus was confirmed 2 weeks later by RT-PCR. Our results indicate the constructs of the full-length cDNA of CPMMV are fully infectious in both in vitro and in vivo transcription strategies.
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Affiliation(s)
- Silvia L Carvalho
- Department of Phytopathology, Universidade Federal de Viçosa, Av. P. H. Rolfs, s/n Campus Universitário, Viçosa, MG, 36570-900, Brazil
| | - Tatsuya Nagata
- Department of Cell Biology, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Brasília, DF, 70910-900, Brazil
| | - Bruna R Junqueira
- Department of Cell Biology, Universidade de Brasília, Campus Universitário Darcy Ribeiro, Brasília, DF, 70910-900, Brazil
| | - Larissa G Zanardo
- Department of Phytopathology, Universidade Federal de Viçosa, Av. P. H. Rolfs, s/n Campus Universitário, Viçosa, MG, 36570-900, Brazil
| | - Ana C S Paiva
- Department of Phytopathology, Universidade Federal de Viçosa, Av. P. H. Rolfs, s/n Campus Universitário, Viçosa, MG, 36570-900, Brazil
| | - Claudine M Carvalho
- Department of Phytopathology, Universidade Federal de Viçosa, Av. P. H. Rolfs, s/n Campus Universitário, Viçosa, MG, 36570-900, 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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Wieczorek P, Budziszewska M, Obrępalska-Stęplowska A. Construction of infectious clones of tomato torrado virus and their delivery by agroinfiltration. Arch Virol 2015; 160:517-21. [PMID: 25416854 PMCID: PMC4315485 DOI: 10.1007/s00705-014-2266-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Accepted: 10/23/2014] [Indexed: 11/30/2022]
Abstract
The first biologically active infectious clones of tomato torrado virus (ToTV) were generated and delivered into Nicotiana benthamiana and Solanum lycopersicum plants via Agrobacterium tumefaciens. The engineered constructs consisted of PCR-amplified complementary DNAs derived from the ToTV RNA1 and RNA2 components, individually inserted into an engineered pGreen binary vector between the CaMV 35S promoter and nopaline synthase terminator. These constructs were introduced into the plant hosts by means of A. tumefaciens-mediated infiltration. In the presence of the progeny virus, typical symptoms of ToTV infection developed in N. benthamiana and S. lycopersicum. Moreover, the virus was sap-transmissible when isolated from agroinfiltrated plants and induced symptoms similar to those caused by the wild-type virus. The presence of viral particles and viral genetic material was confirmed by electron microscopy and re-inoculation to S. lycopersicum and N. benthamiana, as well as by reverse transcription polymerase chain reaction and high-resolution melt analysis.
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Affiliation(s)
- Przemysław Wieczorek
- Interdepartmental Laboratory of Molecular Biology, Institute of Plant Protection, National Research Institute, Władysława Węgorka 20 St, 60-318 Poznań, Poland
| | - Marta Budziszewska
- Interdepartmental Laboratory of Molecular Biology, Institute of Plant Protection, National Research Institute, Władysława Węgorka 20 St, 60-318 Poznań, Poland
| | - Aleksandra Obrępalska-Stęplowska
- Interdepartmental Laboratory of Molecular Biology, Institute of Plant Protection, National Research Institute, Władysława Węgorka 20 St, 60-318 Poznań, Poland
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Dhir S, Walia Y, Zaidi AA, Hallan V. A simplified strategy for studying the etiology of viral diseases: Apple stem grooving virus as a case study. J Virol Methods 2014; 213:106-10. [PMID: 25486082 DOI: 10.1016/j.jviromet.2014.11.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Revised: 11/05/2014] [Accepted: 11/11/2014] [Indexed: 11/24/2022]
Abstract
A simple method to amplify infective, complete genomes of single stranded RNA viruses by long distance PCR (LD PCR) from woody plant tissues is described in detail. The present protocol eliminates partial purification of viral particles and the amplification is achieved in three steps: (i) easy preparation of template RNA by incorporating a pre processing step before loading onto the column (ii) reverse transcription by AMV or Superscript reverse transcriptase and (iii) amplification of cDNA by LD PCR using LA or Protoscript Taq DNA polymerase. Incorporation of a preprocessing step helped to isolate consistent quality RNA from recalcitrant woody tissues such as apple, which was critical for efficient amplification of the complete genomes of Apple stem pitting virus (ASPV), Apple stem grooving virus (ASGV) and Apple chlorotic leaf spot virus (ACLSV). Complete genome of ASGV was cloned under T7 RNA polymerase promoter and was confirmed to be infectious through transcript inoculation producing symptoms similar to the wild type virus. This is the first report for the largest RNA virus genome amplified by PCR from total nucleic acid extracts of woody plant tissues.
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Affiliation(s)
- Sunny Dhir
- Plant Virus Lab, Floriculture Division, CSIR- Institute of Himalayan Bioresource Technology, Palampur, H.P. 176061, India; Academy of Scientific and Innovative Research (AcSIR), New Delhi, India
| | - Yashika Walia
- Plant Virus Lab, Floriculture Division, CSIR- Institute of Himalayan Bioresource Technology, Palampur, H.P. 176061, India
| | - A A Zaidi
- Plant Virus Lab, Floriculture Division, CSIR- Institute of Himalayan Bioresource Technology, Palampur, H.P. 176061, India
| | - Vipin Hallan
- Plant Virus Lab, Floriculture Division, CSIR- Institute of Himalayan Bioresource Technology, Palampur, H.P. 176061, India.
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