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Hardy J, Demecheleer E, Schauvliege M, Staelens D, Mortier V, Verhofstede C. Reverse transcription of plasma-derived HIV-1 RNA generates multiple artifacts through tRNA(Lys-3)-priming. Microbiol Spectr 2024; 12:e0387223. [PMID: 38442427 PMCID: PMC10986323 DOI: 10.1128/spectrum.03872-23] [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: 11/06/2023] [Accepted: 02/05/2024] [Indexed: 03/07/2024] Open
Abstract
In vitro reverse transcription of full-length HIV-1 RNA extracted from the blood plasma of people living with HIV-1 remains challenging. Here, we describe the initiation of reverse transcription of plasma-derived viral RNA in the absence of an exogenous primer. Real-time PCR and Sanger sequencing were applied to identify the source and to monitor the outcome of this reaction. Results demonstrated that during purification of viral RNA from plasma, tRNA(Lys-3) is co-extracted in a complex with the viral RNA. In the presence of a reverse transcription enzyme, this tRNA(Lys-3) can induce reverse transcription, a reaction that is not confined to transcription of the 5' end of the viral RNA. A range of cDNA products is generated, most of them indicative for the occurrence of in vitro strand transfer events that involve translocation of cDNA from the 5' end to random positions on the viral RNA. This process results in the formation of cDNAs with large internal deletions. However, near full-length cDNA and cDNA with sequence patterns resembling multiple spliced HIV-1 RNA were also detected. Despite its potential to introduce significant bias in the interpretation of results across various applications, tRNA(Lys-3)-driven reverse transcription has been overlooked thus far. A more in-depth study of this tRNA-driven in vitro reaction may provide new insight into the complex process of in vivo HIV-1 replication.IMPORTANCEThe use of silica-based extraction methods for purifying HIV-1 RNA from viral particles is a common practice, but it involves co-extraction of human tRNA(Lys-3) due to the strong interactions between these molecules. This co-extraction becomes particularly significant when the extracted RNA is used in reverse transcription reactions, as the tRNA(Lys-3) then serves as a primer. Reverse transcription from tRNA(Lys-3) is not confined to cDNA synthesis of the 5' end of the viral RNA but extends across various regions of the viral genome through in vitro strand transfer events. Co-extraction of tRNA(Lys-3) has been overlooked thus far, despite its potential to introduce bias in downstream, reverse transcription-related applications. The observed events in the tRNA(Lys-3)-induced in vitro reverse transcription resemble in vivo replication processes. Therefore, these reactions may offer a unique model to better understand the replication dynamics of HIV-1.
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Affiliation(s)
- Jarryt Hardy
- Aids Reference Laboratory, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Els Demecheleer
- Aids Reference Laboratory, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Marlies Schauvliege
- Aids Reference Laboratory, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Delfien Staelens
- Aids Reference Laboratory, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Virginie Mortier
- Aids Reference Laboratory, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
| | - Chris Verhofstede
- Aids Reference Laboratory, Department of Diagnostic Sciences, Ghent University, Ghent, Belgium
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2
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Brunetti NS, Davanzo GG, de Moraes D, Ferrari AJR, Souza GF, Muraro SP, Knittel TL, Boldrini VO, Monteiro LB, Virgílio-da-Silva JV, Profeta GS, Wassano NS, Nunes Santos L, Carregari VC, Dias AHS, Veras FP, Tavares LA, Forato J, Castro IMS, Silva-Costa LC, Palma AC, Mansour E, Ulaf RG, Bernardes AF, Nunes TA, Ribeiro LC, Agrela MV, Moretti ML, Buscaratti LI, Crunfli F, Ludwig RG, Gerhardt JA, Munhoz-Alves N, Marques AM, Sesti-Costa R, Amorim MR, Toledo-Teixeira DA, Parise PL, Martini MC, Bispos-Dos-Santos K, Simeoni CL, Granja F, Silvestrini VC, de Oliveira EB, Faca VM, Carvalho M, Castelucci BG, Pereira AB, Coimbra LD, Dias MMG, Rodrigues PB, Gomes ABSP, Pereira FB, Santos LMB, Bloyet LM, Stumpf S, Pontelli MC, Whelan S, Sposito AC, Carvalho RF, Vieira AS, Vinolo MAR, Damasio A, Velloso L, Figueira ACM, da Silva LLP, Cunha TM, Nakaya HI, Marques-Souza H, Marques RE, Martins-de-Souza D, Skaf MS, Proenca-Modena JL, Moraes-Vieira PMM, Mori MA, Farias AS. SARS-CoV-2 uses CD4 to infect T helper lymphocytes. eLife 2023; 12:e84790. [PMID: 37523305 PMCID: PMC10390044 DOI: 10.7554/elife.84790] [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: 11/30/2022] [Accepted: 07/13/2023] [Indexed: 08/02/2023] Open
Abstract
The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is the agent of a major global outbreak of respiratory tract disease known as Coronavirus Disease 2019 (COVID-19). SARS-CoV-2 infects mainly lungs and may cause several immune-related complications, such as lymphocytopenia and cytokine storm, which are associated with the severity of the disease and predict mortality. The mechanism by which SARS-CoV-2 infection may result in immune system dysfunction is still not fully understood. Here, we show that SARS-CoV-2 infects human CD4+ T helper cells, but not CD8+ T cells, and is present in blood and bronchoalveolar lavage T helper cells of severe COVID-19 patients. We demonstrated that SARS-CoV-2 spike glycoprotein (S) directly binds to the CD4 molecule, which in turn mediates the entry of SARS- CoV-2 in T helper cells. This leads to impaired CD4 T cell function and may cause cell death. SARS-CoV-2-infected T helper cells express higher levels of IL-10, which is associated with viral persistence and disease severity. Thus, CD4-mediated SARS-CoV-2 infection of T helper cells may contribute to a poor immune response in COVID-19 patients.
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Grants
- #2295/20 Fundo de Apoio ao Ensino, à Pesquisa e Extensão, Universidade Estadual de Campinas
- #2021/08354-2 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2015/15626-8 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2019/14465-1 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #465489/2014-1 Instituto Nacional de Ciência e Tecnologia em Neuroimunomodulação
- #01.20.0003.00 Financiadora de Estudos e Projetos
- #306248/2017-4 Conselho Nacional de Desenvolvimento Científico e Tecnológico
- #2019/17007-4 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2019/04726-2 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2319/20 Fundo de Apoio ao Ensino, à Pesquisa e Extensão, Universidade Estadual de Campinas
- #2274/20 Fundo de Apoio ao Ensino, à Pesquisa e Extensão, Universidade Estadual de Campinas
- #2266/20 Fundo de Apoio ao Ensino, à Pesquisa e Extensão, Universidade Estadual de Campinas
- #2458/20 Fundo de Apoio ao Ensino, à Pesquisa e Extensão, Universidade Estadual de Campinas
- #2019/16116-4 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2019/06372-3 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2020/04583-4 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2013/08293-7 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2020/04579-7 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2018/14933-2 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2020/04746-0 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2019/00098-7 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2020/04919-2 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2017/01184-9 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2020/04558-0 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2016/00194-8 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2016/18031- 8 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2019/22398-2 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2019/13552-8 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2019/05155-9 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2019/06459-1 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2017/23920-9 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2016/24163-4 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #2016/23328-0 Fundação de Amparo à Pesquisa do Estado de São Paulo
- #310287/2018-9 Conselho Nacional de Desenvolvimento Científico e Tecnológico
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Affiliation(s)
- Natalia S Brunetti
- Autoimmune Research Laboratory, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Gustavo G Davanzo
- Laboratory of Immunometabolism, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Diogo de Moraes
- Laboratory of Aging Biology, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
- Department of Structural and Functional Biology, Institute of Biosciences, Sao Paulo State University (UNESP), Botucatu, Brazil
| | - Allan J R Ferrari
- Institute of Chemistry and Center for Computing in Engineering and Sciences, University of Campinas, Campinas (UNICAMP), Campinas, Brazil
| | - Gabriela F Souza
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Stéfanie Primon Muraro
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Thiago L Knittel
- Laboratory of Aging Biology, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Vinicius O Boldrini
- Autoimmune Research Laboratory, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Lauar B Monteiro
- Laboratory of Immunometabolism, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - João Victor Virgílio-da-Silva
- Laboratory of Immunometabolism, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Gerson S Profeta
- Laboratory of Aging Biology, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Natália S Wassano
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Luana Nunes Santos
- Brazilian Laboratory on Silencing Technologies (BLaST), Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Victor C Carregari
- Laboratory of Neuroproteomics, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Artur H S Dias
- Institute of Chemistry and Center for Computing in Engineering and Sciences, University of Campinas, Campinas (UNICAMP), Campinas, Brazil
| | - Flavio P Veras
- Center of Research in Inflammatory Diseases, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
- Department of BioMolecular Sciences, School of Pharmaceutical Sciences, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto,, São Paulo, Brazil
| | - Lucas A Tavares
- Department of Cell and Molecular Biology, Center for Virology Research, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Julia Forato
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Icaro M S Castro
- Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil
| | - Lícia C Silva-Costa
- Laboratory of Neuroproteomics, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - André C Palma
- Department of Internal Medicine, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Eli Mansour
- Department of Internal Medicine, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Raisa G Ulaf
- Department of Internal Medicine, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Ana F Bernardes
- Department of Internal Medicine, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Thyago A Nunes
- Department of Internal Medicine, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Luciana C Ribeiro
- Department of Internal Medicine, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Marcus V Agrela
- Department of Internal Medicine, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Maria Luiza Moretti
- Department of Internal Medicine, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Lucas I Buscaratti
- Brazilian Laboratory on Silencing Technologies (BLaST), Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Fernanda Crunfli
- Laboratory of Neuroproteomics, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Raissa G Ludwig
- Laboratory of Aging Biology, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Jaqueline A Gerhardt
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Natália Munhoz-Alves
- Autoimmune Research Laboratory, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Ana Maria Marques
- Autoimmune Research Laboratory, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Renata Sesti-Costa
- Autoimmune Research Laboratory, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
- Hematology and Hemotherapy Center, University of Campinas (UNICAMP), Campinas, Brazil
| | - Mariene R Amorim
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Daniel A Toledo-Teixeira
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Pierina Lorencini Parise
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Matheus Cavalheiro Martini
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Karina Bispos-Dos-Santos
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Camila L Simeoni
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Fabiana Granja
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Virgínia C Silvestrini
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Eduardo B de Oliveira
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Vitor M Faca
- Department of Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Murilo Carvalho
- National Biosciences Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
| | - Bianca G Castelucci
- National Biosciences Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
- Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
| | - Alexandre B Pereira
- National Biosciences Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
| | - Laís D Coimbra
- National Biosciences Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
| | - Marieli M G Dias
- National Biosciences Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
| | - Patricia B Rodrigues
- Laboratory of Immunoinflammation, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil;, Campinas, Brazil
| | - Arilson Bernardo S P Gomes
- Laboratory of Immunoinflammation, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil;, Campinas, Brazil
| | - Fabricio B Pereira
- Hematology and Hemotherapy Center, University of Campinas (UNICAMP), Campinas, Brazil
| | - Leonilda M B Santos
- Neuroimmunology Unit, Department of Genetics, Microbiology and Immunology, University of Campinas (UNICAMP), Campinas, Brazil
- National Institute of Science and Technology on Neuroimmunomodulation (INCT-NIM) - Oswaldo Cruz Institute, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil
| | - Louis-Marie Bloyet
- Washington University in St Louis, Department of Molecular Microbiology, St. Louis, United States
| | - Spencer Stumpf
- Washington University in St Louis, Department of Molecular Microbiology, St. Louis, United States
| | - Marjorie C Pontelli
- Washington University in St Louis, Department of Molecular Microbiology, St. Louis, United States
| | - Sean Whelan
- Washington University in St Louis, Department of Molecular Microbiology, St. Louis, United States
| | - Andrei C Sposito
- Laboratory of Vascular Biology and Arteriosclerosis, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil
| | - Robson F Carvalho
- Department of Structural and Functional Biology, Institute of Biosciences, Sao Paulo State University (UNESP), Botucatu, Brazil
| | - André S Vieira
- Laboratory of Electrophysiology, Neurobiology and Behavior, University of Campinas (UNICAMP), Campinas, Brazil
| | - Marco A R Vinolo
- Laboratory of Immunoinflammation, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil;, Campinas, Brazil
- Experimental Medicine Research Cluster (EMRC), University of Campinas (UNICAMP), Campinas, Brazil
- Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - André Damasio
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
- Experimental Medicine Research Cluster (EMRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Licio Velloso
- Department of Internal Medicine, School of Medical Sciences, University of Campinas (UNICAMP), Campinas, Brazil
- Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Ana Carolina M Figueira
- National Biosciences Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
| | - Luis L P da Silva
- Center of Research in Inflammatory Diseases, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Thiago Mattar Cunha
- Center of Research in Inflammatory Diseases, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto,, São Paulo, Brazil
| | - Helder I Nakaya
- Department of Clinical and Toxicological Analyses, School of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil
| | - Henrique Marques-Souza
- Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
- Brazilian Laboratory on Silencing Technologies (BLaST), Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
| | - Rafael E Marques
- National Biosciences Laboratory (LNBio), Brazilian Center for Research in Energy and Materials (CNPEM), Campinas, Brazil
| | - Daniel Martins-de-Souza
- Laboratory of Neuroproteomics, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
- Experimental Medicine Research Cluster (EMRC), University of Campinas (UNICAMP), Campinas, Brazil
- D'Or Institute for Research and Education (IDOR), São Paulo, Brazil
- National Institute of Science and Technology in Biomarkers for Neuropsychiatry (INCTINBION), São Paulo, Brazil
| | - Munir S Skaf
- Institute of Chemistry and Center for Computing in Engineering and Sciences, University of Campinas, Campinas (UNICAMP), Campinas, Brazil
| | - Jose Luiz Proenca-Modena
- Laboratory of Emerging Viruses, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
- Experimental Medicine Research Cluster (EMRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Pedro M M Moraes-Vieira
- Laboratory of Immunometabolism, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
- Experimental Medicine Research Cluster (EMRC), University of Campinas (UNICAMP), Campinas, Brazil
- Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Marcelo A Mori
- Laboratory of Aging Biology, Department of Biochemistry and Tissue Biology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
- Experimental Medicine Research Cluster (EMRC), University of Campinas (UNICAMP), Campinas, Brazil
- Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
| | - Alessandro S Farias
- Autoimmune Research Laboratory, Department of Genetics, Microbiology and Immunology, Institute of Biology, University of Campinas (UNICAMP), Campinas, Brazil
- Washington University in St Louis, Department of Molecular Microbiology, St. Louis, United States
- Experimental Medicine Research Cluster (EMRC), University of Campinas (UNICAMP), Campinas, Brazil
- Obesity and Comorbidities Research Center (OCRC), University of Campinas (UNICAMP), Campinas, Brazil
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Barnard TR, Wang AB, Sagan SM. A highly sensitive strand-specific multiplex RT-qPCR assay for quantitation of Zika virus replication. J Virol Methods 2022; 307:114556. [PMID: 35654259 DOI: 10.1016/j.jviromet.2022.114556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 05/25/2022] [Accepted: 05/28/2022] [Indexed: 10/18/2022]
Abstract
Reverse-transcription quantitative polymerase chain reaction (RT-qPCR) is widely used to quantify viral RNA genomes for diagnostics and research, yet conventional RT-qPCR protocols are unable to accurately distinguish between the different viral RNA species that exist during infection. Here we show that false-priming and self-priming occur during reverse transcription with several published Zika virus (ZIKV) primer sets. We developed a RT-qPCR assay using tagged primers and thermostable reverse transcriptase, which greatly reduced the occurrence of nonspecific cDNA products. Furthermore, we optimized the assay for use in multiplex qPCR which allows for simultaneous quantitative detection of positive-strand and negative-strand ZIKV RNA along with an internal control from both human and mosquito cells. Importantly, this assay is sensitive enough to study early stages of virus infection in vitro. Strikingly, using this assay, we detected ZIKV negative-strand RNA as early as 3 h post-infection in mammalian cell culture, at a time point prior to the onset of positive-strand RNA synthesis. Overall, the strand-specific RT-qPCR assay developed herein is a valuable tool to quantify ZIKV RNA and to study viral replication dynamics during infection. The application of these findings has the potential to increase accuracy of RNA detection methods for a variety of viral pathogens.
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Affiliation(s)
- Trisha R Barnard
- Department of Microbiology & Immunology, McGill University, Montreal, QC, Canada
| | - Alex B Wang
- Department of Microbiology & Immunology, McGill University, Montreal, QC, Canada
| | - Selena M Sagan
- Department of Microbiology & Immunology, McGill University, Montreal, QC, Canada; Department of Biochemistry, McGill University, Montreal, QC, Canada.
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4
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Ravn Warncke S, Rohde Knudsen C. Detection methods targeting the positive- and negative-sense RNA transcripts from plus-stranded RNA viruses. APMIS 2021; 130:284-292. [PMID: 34939239 PMCID: PMC9306919 DOI: 10.1111/apm.13202] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 12/16/2021] [Indexed: 11/27/2022]
Abstract
The largest group of viruses in the Baltimore classification system comprises viruses with a positive-sense, single-stranded RNA genome. Once the viral genome is released into the cytoplasm of a specific host cell following virus entry, it functions directly as a mRNA and the virus-encoded proteins that are essential for genome replication, are produced by the translation apparatus of the host cell. The positive-sense genome is replicated in two stages, initially the positive strand is copied to make a negative-sense RNA, which then functions as the template for transcription of many new positive-sense genomes. Virus infections can be detected at different stages throughout the infection cycle for diagnostic and scientific purposes. Here, the advantages and disadvantages of some of the relevant methods for genome detection will be briefly reviewed with special emphasis on techniques allowing strand-specific RNA detection. Furthermore, tools of the future are considered.
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Affiliation(s)
- Signe Ravn Warncke
- Department of Molecular Biology & Genetics, University of Aarhus, Gustav Wieds Vej 10 C, DK-8000, Aarhus C, Denmark
| | - Charlotte Rohde Knudsen
- Department of Molecular Biology & Genetics, University of Aarhus, Gustav Wieds Vej 10 C, DK-8000, Aarhus C, Denmark
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5
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High-Order Epistasis and Functional Coupling of Infection Steps Drive Virus Evolution toward Independence from a Host Pathway. Microbiol Spectr 2021; 9:e0080021. [PMID: 34468191 PMCID: PMC8557862 DOI: 10.1128/spectrum.00800-21] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The phosphatidylinositol-4 kinase IIIβ (PI4KB)/oxysterol-binding protein (OSBP) family I pathway serves as an essential host pathway for the formation of viral replication complex for viral plus-strand RNA synthesis; however, poliovirus (PV) could evolve toward substantial independence from this host pathway with four mutations. Recessive epistasis of the two mutations (3A-R54W and 2B-F17L) is essential for viral RNA replication. Quantitative analysis of effects of the other two mutations (2B-Q20H and 2C-M187V) on each step of infection reveals functional couplings between viral replication, growth, and spread conferred by the 2B-Q20H mutation, while no enhancing effect was conferred by the 2C-M187V mutation. The effects of the 2B-Q20H mutation occur only via another recessive epistasis between the 3A-R54W/2B-F17L mutations. These mutations confer enhanced replication in PI4KB/OSBP-independent infection concomitantly with an increased ratio of viral plus-strand RNA to the minus-strand RNA. This work reveals the essential roles of the functional coupling and high-order, multi-tiered recessive epistasis in viral evolution toward independence from an obligatory host pathway. IMPORTANCE Each virus has a different strategy for its replication, which requires different host factors. Enterovirus, a model RNA virus, requires host factors PI4KB and OSBP, which form an obligatory functional axis to support viral replication. In an experimental evolution system in vitro, virus mutants that do not depend on these host factors could arise only with four mutations. The two mutations (3A-R54W and 2B-F17L) are required for the replication but are not sufficient to support efficient infection. Another mutation (2B-Q20H) is essential for efficient spread of the virus. The order of introduction of the mutations in the viral genome is essential (known as “epistasis”), and functional couplings of infection steps (i.e., viral replication, growth, and spread) have substantial roles to show the effects of the 2B-Q20H mutation. These observations would provide novel insights into an evolutionary pathway of the virus to require host factors for infection.
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Modeling the complete kinetics of coxsackievirus B3 reveals human determinants of host-cell feedback. Cell Syst 2021; 12:304-323.e13. [PMID: 33740397 DOI: 10.1016/j.cels.2021.02.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Revised: 01/13/2021] [Accepted: 02/19/2021] [Indexed: 12/13/2022]
Abstract
Complete kinetic models are pervasive in chemistry but lacking in biological systems. We encoded the complete kinetics of infection for coxsackievirus B3 (CVB3), a compact and fast-acting RNA virus. The model consists of separable, detailed modules describing viral binding-delivery, translation-replication, and encapsidation. Specific module activities are dampened by the type I interferon response to viral double-stranded RNAs (dsRNAs), which is itself disrupted by viral proteinases. The experimentally validated kinetics uncovered that cleavability of the dsRNA transducer mitochondrial antiviral signaling protein (MAVS) becomes a stronger determinant of viral outcomes when cells receive supplemental interferon after infection. Cleavability is naturally altered in humans by a common MAVS polymorphism, which removes a proteinase-targeted site but paradoxically elevates CVB3 infectivity. These observations are reconciled with a simple nonlinear model of MAVS regulation. Modeling complete kinetics is an attainable goal for small, rapidly infecting viruses and perhaps viral pathogens more broadly. A record of this paper's transparent peer review process is included in the Supplemental information.
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Salmikangas S, Laiho JE, Kalander K, Laajala M, Honkimaa A, Shanina I, Oikarinen S, Horwitz MS, Hyöty H, Marjomäki V. Detection of Viral -RNA and +RNA Strands in Enterovirus-Infected Cells and Tissues. Microorganisms 2020; 8:microorganisms8121928. [PMID: 33291747 PMCID: PMC7761939 DOI: 10.3390/microorganisms8121928] [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: 10/30/2020] [Revised: 11/24/2020] [Accepted: 12/02/2020] [Indexed: 11/16/2022] Open
Abstract
The current methods to study the distribution and dynamics of viral RNA molecules inside infected cells are not ideal, as electron microscopy and immunohistochemistry can only detect mature virions, and quantitative real-time PCR does not reveal localized distribution of RNAs. We demonstrated here the branched DNA in situ hybridization (bDNA ISH) technology to study both the amount and location of the emerging -RNA and +RNA during acute and persistent enterovirus infections. According to our results, the replication of the viral RNA started 2-3 h after infection and the translation shortly after at 3-4 h post-infection. The replication hotspots with newly emerging -RNA were located quite centrally in the cell, while the +RNA production and most likely virion assembly took place in the periphery of the cell. We also discovered that the pace of replication of -RNA and +RNA strands was almost identical, and -RNA was absent during antiviral treatments. ViewRNA ISH with our custom probes also showed a good signal during acute and persistent enterovirus infections in cell and mouse models. Considering these results, along with the established bDNA FISH protocol modified by us, the effects of antiviral drugs and the emergence of enterovirus RNAs in general can be studied more effectively.
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Affiliation(s)
- Sami Salmikangas
- Department of Biological and Environmental Science/Nanoscience Center, University of Jyväskylä, Survontie 9C, FI-40500 Jyväskylä, Finland; (S.S.); (K.K.); (M.L.)
| | - Jutta E. Laiho
- Faculty of Medicine and Health Technology, Tampere University, FI-33520 Tampere, Finland; (J.E.L.); (A.H.); (S.O.); (H.H.)
| | - Kerttu Kalander
- Department of Biological and Environmental Science/Nanoscience Center, University of Jyväskylä, Survontie 9C, FI-40500 Jyväskylä, Finland; (S.S.); (K.K.); (M.L.)
| | - Mira Laajala
- Department of Biological and Environmental Science/Nanoscience Center, University of Jyväskylä, Survontie 9C, FI-40500 Jyväskylä, Finland; (S.S.); (K.K.); (M.L.)
| | - Anni Honkimaa
- Faculty of Medicine and Health Technology, Tampere University, FI-33520 Tampere, Finland; (J.E.L.); (A.H.); (S.O.); (H.H.)
| | - Iryna Shanina
- Department of Microbiology and Immunology, Life Sciences Institute, University of British Columbia, Vancouver, BC V6T1Z3, Canada; (I.S.); (M.S.H.)
| | - Sami Oikarinen
- Faculty of Medicine and Health Technology, Tampere University, FI-33520 Tampere, Finland; (J.E.L.); (A.H.); (S.O.); (H.H.)
| | - Marc S. Horwitz
- Department of Microbiology and Immunology, Life Sciences Institute, University of British Columbia, Vancouver, BC V6T1Z3, Canada; (I.S.); (M.S.H.)
| | - Heikki Hyöty
- Faculty of Medicine and Health Technology, Tampere University, FI-33520 Tampere, Finland; (J.E.L.); (A.H.); (S.O.); (H.H.)
| | - Varpu Marjomäki
- Department of Biological and Environmental Science/Nanoscience Center, University of Jyväskylä, Survontie 9C, FI-40500 Jyväskylä, Finland; (S.S.); (K.K.); (M.L.)
- Correspondence: ; Tel.: +358-405634422
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8
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Quintela BDM, Conway JM, Hyman JM, Guedj J, Dos Santos RW, Lobosco M, Perelson AS. A New Age-Structured Multiscale Model of the Hepatitis C Virus Life-Cycle During Infection and Therapy With Direct-Acting Antiviral Agents. Front Microbiol 2018; 9:601. [PMID: 29670586 PMCID: PMC5893852 DOI: 10.3389/fmicb.2018.00601] [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: 01/08/2018] [Accepted: 03/15/2018] [Indexed: 12/12/2022] Open
Abstract
The dynamics of hepatitis C virus (HCV) RNA during translation and replication within infected cells were added to a previous age-structured multiscale mathematical model of HCV infection and treatment. The model allows the study of the dynamics of HCV RNA inside infected cells as well as the release of virus from infected cells and the dynamics of subsequent new cell infections. The model was used to fit in vitro data and estimate parameters characterizing HCV replication. This is the first model to our knowledge to consider both positive and negative strands of HCV RNA with an age-structured multiscale modeling approach. Using this model we also studied the effects of direct-acting antiviral agents (DAAs) in blocking HCV RNA intracellular replication and the release of new virions and fit the model to in vivo data obtained from HCV-infected subjects under therapy.
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Affiliation(s)
- Barbara de M Quintela
- FISIOCOMP Laboratory, PPGMC, Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil
| | - Jessica M Conway
- Department of Mathematics and Center for Infectious Disease Dynamics, The Pennsylvania State University, State College, PA, United States
| | - James M Hyman
- Mathematics Department, Tulane University, New Orleans, LA, United States
| | - Jeremie Guedj
- IAME, UMR 1137, Institut National de la Santé et de la Recherche Médicale, Université Paris Diderot, Sorbonne Paris Cité, Paris, France
| | - Rodrigo W Dos Santos
- FISIOCOMP Laboratory, PPGMC, Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil
| | - Marcelo Lobosco
- FISIOCOMP Laboratory, PPGMC, Universidade Federal de Juiz de Fora, Juiz de Fora, Brazil
| | - Alan S Perelson
- Theoretical Biology and Biophysics, Los Alamos National Laboratory, Los Alamos, NM, United States
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9
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Fikatas A, Dimitriou TG, Kyriakopoulou Z, Moschonas GD, Amoutzias GD, Mossialos D, Gartzonika C, Levidiotou-Stefanou S, Markoulatos P. Detection of negative and positive RNA strand of poliovirus Sabin 1 and echovirus E19 by a stem-loop reverse transcription PCR. Lett Appl Microbiol 2017. [PMID: 28631392 DOI: 10.1111/lam.12766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this report a strand specific RT-PCR was established for the detection of the replicative negative RNA strand of poliovirus sabin 1 (Sabin1) and Echovirus 19 (E19) strains. The key for the successful conduction of the assay was the use of a specific reverse transcription primer targeting the 5'-UTR of enteroviruses that consisted of a stem-loop structure at the 5'-end and an enteroviral-specific sequence at the 3'-end. The stem loop RT-PCR was found to be an accurate and sensitive method, detecting even 10-2 CCID50 of poliovirus sabin 1 (Sabin1) and E19 strains 6 h postinfection (p.i.), while CPE appeared 3 days later. This assay was also validated in SiHa and Caski cell lines that are not used for the detection of enteroviruses. The negative RNA strand was detected 6 h and 12 h p.i. in SiHa and Caski cells, when these cell lines were inoculated with 105 and 1 CCID50 respectively, whereas CPE was observed 5 days p.i for SiHa cells and 8 days p.i for Caski cells and that only at 105 CCID50 . The results show that this approach may be used for replacing the time-consuming cell cultures in order to detect the active replication of enteroviruses. SIGNIFICANCE AND IMPACT OF THE STUDY Enteroviruses are positive stranded RNA viruses that may cause severe diseases. The conventional method for detection of active viral replication involves virus isolation in sensitive cell cultures followed by titration and seroneutralization. In this report, we describe the use of a stem-loop secondary structured oligonucleotide in RT-PCR assay for the detection of the replicative negative strand of the positive-stranded RNA of poliovirus sabin 1 and E19 strains. This approach proved to be a useful tool that may be used for replacing the time-consuming cell culture assays in order to detect the active replication of enteroviruses.
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Affiliation(s)
- A Fikatas
- Microbiology - Virology Laboratory, Department of Biochemistry & Biotechnology, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - T G Dimitriou
- Microbiology - Virology Laboratory, Department of Biochemistry & Biotechnology, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - Z Kyriakopoulou
- Microbiology - Virology Laboratory, Department of Biochemistry & Biotechnology, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - G D Moschonas
- Microbiology - Virology Laboratory, Department of Biochemistry & Biotechnology, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - G D Amoutzias
- Bioinformatics Laboratory, Department of Biochemistry & Biotechnology, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - D Mossialos
- Microbiology - Virology Laboratory, Department of Biochemistry & Biotechnology, School of Health Sciences, University of Thessaly, Larissa, Greece
| | - C Gartzonika
- Department of Microbiology, Medical School, University of Ioannina, Ioannina, Greece
| | - S Levidiotou-Stefanou
- Department of Microbiology, Medical School, University of Ioannina, Ioannina, Greece
| | - P Markoulatos
- Microbiology - Virology Laboratory, Department of Biochemistry & Biotechnology, School of Health Sciences, University of Thessaly, Larissa, Greece
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10
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Dengue virus replicates and accumulates in Aedes aegypti salivary glands. Virology 2017; 507:75-81. [PMID: 28431281 DOI: 10.1016/j.virol.2017.04.009] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 04/06/2017] [Accepted: 04/07/2017] [Indexed: 12/20/2022]
Abstract
Dengue virus (DENV) is an RNA virus transmitted among humans by mosquito vectors, mainly Aedes aegypti. DENV transmission requires viral dissemination from the mosquito midgut to the salivary glands. During this process the virus undergoes several population bottlenecks, which are stochastic reductions in population size that restrict intra-host viral genetic diversity and limit the efficiency of natural selection. Despite the implications for virus transmission and evolution, DENV replication in salivary glands has not been directly demonstrated. Here, we used a strand-specific quantitative RT-PCR assay to demonstrate that negative-strand DENV RNA is produced in Ae. aegypti salivary glands, providing conclusive evidence that viral replication occurs in this tissue. Furthermore, we showed that the concentration of DENV genomic RNA in salivary glands increases significantly over time, indicating that active replication likely replenishes DENV genetic diversity prior to transmission. These findings improve our understanding of the biological determinants of DENV fitness and evolution.
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11
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Mostovoy Y, Thiemicke A, Hsu TY, Brem RB. The Role of Transcription Factors at Antisense-Expressing Gene Pairs in Yeast. Genome Biol Evol 2016; 8:1748-61. [PMID: 27190003 PMCID: PMC4943177 DOI: 10.1093/gbe/evw104] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Genes encoded close to one another on the chromosome are often coexpressed, by a mechanism and regulatory logic that remain poorly understood. We surveyed the yeast genome for tandem gene pairs oriented tail-to-head at which expression antisense to the upstream gene was conserved across species. The intergenic region at most such tandem pairs is a bidirectional promoter, shared by the downstream gene mRNA and the upstream antisense transcript. Genomic analyses of these intergenic loci revealed distinctive patterns of transcription factor regulation. Mutation of a given transcription factor verified its role as a regulator in trans of tandem gene pair loci, including the proximally initiating upstream antisense transcript and downstream mRNA and the distally initiating upstream mRNA. To investigate cis-regulatory activity at such a locus, we focused on the stress-induced NAD(P)H dehydratase YKL151C and its downstream neighbor, the metabolic enzyme GPM1. Previous work has implicated the region between these genes in regulation of GPM1 expression; our mutation experiments established its function in rich medium as a repressor in cis of the distally initiating YKL151C sense RNA, and an activator of the proximally initiating YKL151C antisense RNA. Wild-type expression of all three transcripts required the transcription factor Gcr2. Thus, at this locus, the intergenic region serves as a focal point of regulatory input, driving antisense expression and mediating the coordinated regulation of YKL151C and GPM1. Together, our findings implicate transcription factors in the joint control of neighboring genes specialized to opposing conditions and the antisense transcripts expressed between them.
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Affiliation(s)
- Yulia Mostovoy
- Department of Molecular and Cell Biology, University of California, Berkeley, California Present address: Cardiovascular Research Institute, University of California, San Francisco, CA
| | - Alexander Thiemicke
- Department of Molecular and Cell Biology, University of California, Berkeley, California Program in Molecular Medicine, Friedrich-Schiller-Universität, Jena, Germany Present address: Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN
| | - Tiffany Y Hsu
- Department of Molecular and Cell Biology, University of California, Berkeley, California Present address: Graduate Program in Biological and Biomedical Sciences, Harvard Medical School, Boston, MA
| | - Rachel B Brem
- Department of Molecular and Cell Biology, University of California, Berkeley, California Present address: Buck Institute for Research on Aging, Novato, CA
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12
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Haist K, Ziegler C, Botten J. Strand-Specific Quantitative Reverse Transcription-Polymerase Chain Reaction Assay for Measurement of Arenavirus Genomic and Antigenomic RNAs. PLoS One 2015; 10:e0120043. [PMID: 25978311 PMCID: PMC4433285 DOI: 10.1371/journal.pone.0120043] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 02/02/2015] [Indexed: 02/03/2023] Open
Abstract
Arenaviruses are bi-segmented, single-stranded RNA viruses that cause significant human disease. The manner in which they regulate the replication of their genome is not well-understood. This is partly due to the absence of a highly sensitive assay to measure individual species of arenavirus replicative RNAs. To overcome this obstacle, we designed a quantitative reverse transcription (RT)-PCR assay for selective quantitation of each of the lymphocytic choriomeningitis virus (LCMV) genomic or antigenomic RNAs. During the course of assay design, we identified a nonspecific priming phenomenon whereby, in the absence of an RT primer, cDNAs complementary to each of the LCMV replicative RNA species are generated during RT. We successfully circumvented this nonspecific priming event through the use of biotinylated primers in the RT reaction, which permitted affinity purification of primer-specific cDNAs using streptavidin-coated magnetic beads. As proof of principle, we used the assay to map the dynamics of LCMV replication at acute and persistent time points and to determine the quantities of genomic and antigenomic RNAs that are incorporated into LCMV particles. This assay can be adapted to measure total S or L segment-derived viral RNAs and therefore represents a highly sensitive diagnostic platform to screen for LCMV infection in rodent and human tissue samples and can also be used to quantify virus-cell attachment.
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Affiliation(s)
- Kelsey Haist
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, United States of America
- Department of Medicine, Division of Immunobiology, University of Vermont, Burlington, Vermont, United States of America
| | - Christopher Ziegler
- Department of Medicine, Division of Immunobiology, University of Vermont, Burlington, Vermont, United States of America
| | - Jason Botten
- Department of Microbiology and Molecular Genetics, University of Vermont, Burlington, Vermont, United States of America
- Department of Medicine, Division of Immunobiology, University of Vermont, Burlington, Vermont, United States of America
- * E-mail:
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13
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Cheung YY, Chen KC, Chen H, Seng EK, Chu JJH. Antiviral activity of lanatoside C against dengue virus infection. Antiviral Res 2014; 111:93-9. [PMID: 25251726 DOI: 10.1016/j.antiviral.2014.09.007] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 08/07/2014] [Accepted: 09/13/2014] [Indexed: 10/24/2022]
Abstract
Dengue infection poses a serious threat globally due to its recent rapid spread and rise in incidence. Currently, there is no approved vaccine or effective antiviral drug for dengue virus infection. In response to the urgent need for the development of an effective antiviral for dengue virus, the US Drug Collection library was screened in this study to identify compounds with anti-dengue activities. Lanatoside C, an FDA approved cardiac glycoside was identified as a candidate anti-dengue compound. Our data revealed that lanatoside C has an IC50 of 0.19μM for dengue virus infection in HuH-7 cells. Dose-dependent reduction in dengue viral RNA and viral proteins synthesis were also observed upon treatment with increasing concentrations of lanatoside C. Time of addition study indicated that lanatoside C inhibits the early processes of the dengue virus replication cycle. Furthermore, lanatoside C can effectively inhibit all four serotypes of dengue virus, flavivirus Kunjin, alphavirus Chikungunya and Sindbis virus as well as the human enterovirus 71. These findings suggest that lanatoside C possesses broad spectrum antiviral activity against several groups of positive-sense RNA viruses.
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Affiliation(s)
- Yan Yi Cheung
- Laboratory of Molecular RNA Virology and Antiviral Strategies, Department of Microbiology, Yong Loo Lin School of Medicine, National University Health System, 5 Science Drive 2, National University of Singapore, Singapore 117597, Singapore
| | - Karen Caiyun Chen
- Laboratory of Molecular RNA Virology and Antiviral Strategies, Department of Microbiology, Yong Loo Lin School of Medicine, National University Health System, 5 Science Drive 2, National University of Singapore, Singapore 117597, Singapore
| | - Huixin Chen
- Laboratory of Molecular RNA Virology and Antiviral Strategies, Department of Microbiology, Yong Loo Lin School of Medicine, National University Health System, 5 Science Drive 2, National University of Singapore, Singapore 117597, Singapore
| | - Eng Khuan Seng
- School of Chemical & Life Sciences, 180 Ang Mo Kio Ave 8, Nanyang Polytechnic, Singapore 569830, Singapore
| | - Justin Jang Hann Chu
- Laboratory of Molecular RNA Virology and Antiviral Strategies, Department of Microbiology, Yong Loo Lin School of Medicine, National University Health System, 5 Science Drive 2, National University of Singapore, Singapore 117597, Singapore.
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Abstract
Enteroviruses can frequently target the human central nervous system to induce a variety of neurological diseases. Although enteroviruses are highly cytolytic, emerging evidence has shown that these viruses can establish persistent infections both in vivo and in vitro. Here, we investigated the susceptibility of three human brain cell lines, CCF-STTG1, T98G, and SK-N-SH, to infection with three enterovirus serotypes: coxsackievirus B3 (CVB3), enterovirus 71, and coxsackievirus A9. Persistent infection was observed in CVB3-infected CCF-STTG1 cells, as evidenced by prolonged detection of infectious virions, viral RNA, and viral antigens. Of note, infected CCF-STTG1 cells expressed the nonfunctional canonical viral receptors coxsackievirus-adenovirus receptor and decay-accelerating factor, while removal of cell surface chondroitin sulfate from CCF-STTG1 cells inhibited the replication of CVB3, suggesting that receptor usage was one of the major limiting factors in CVB3 persistence. In addition, CVB3 curtailed the induction of beta interferon in infected CCF-STTG1 cells, which likely contributed to the initiation of persistence. Furthermore, proinflammatory chemokines and cytokines, such as vascular cell adhesion molecule 1, interleukin-8 (IL-8), and IL-6, were upregulated in CVB3-infected CCF-STTG1 cells and human progenitor-derived astrocytes. Our data together demonstrate the potential of CCF-STTG1 cells to be a novel cell model for studying CVB3-central nervous system interactions, providing the basis toward a better understanding of CVB3-induced chronic neuropathogenesis.
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15
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Feng L, Lintula S, Ho TH, Anastasina M, Paju A, Haglund C, Stenman UH, Hotakainen K, Orpana A, Kainov D, Stenman J. Technique for strand-specific gene-expression analysis and monitoring of primer-independent cDNA synthesis in reverse transcription. Biotechniques 2012; 52:263-70. [PMID: 22482442 DOI: 10.2144/0000113842] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2012] [Accepted: 03/06/2012] [Indexed: 11/23/2022] Open
Abstract
Primer-independent cDNA synthesis during reverse transcription hinders quantitative analysis of bidirectional mRNA synthesis in eukaryotes as well as in cells infected with RNA viruses. We report a simple RT-PCR-based assay for strand-specific gene-expression analysis. By modifying the cDNA sequence during reverse transcription, the opposite strands of target sequences can be simultaneously detected by postamplification melting curve analysis and primer-initiated transcripts are readily distinguished from nonspecifically primed cDNA. We have utilized this technique to optimize the specificity of reverse transcription on a panel of 15 target genes. Primer-independent reverse transcription occurred for all target sequences when reverse transcription was performed at 42°C and accounted for 11%-57% of the final PCR amplification products. By raising the reaction temperature to 55°C, the specificity of reverse transcription could be increased without significant loss of sensitivity. We have also demonstrated the utility of this technique for analysis of (+) and (-) RNA synthesis of influenza A virus in infected cells. Thus, this technique represents a powerful tool for analysis of bidirectional RNA synthesis.
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Affiliation(s)
- Lin Feng
- Minerva Foundation Institute for Medical Research, Helsinki, Finland
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16
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Keum SJ, Park SM, Park JH, Jung JH, Shin EJ, Jang SK. The specific infectivity of hepatitis C virus changes through its life cycle. Virology 2012; 433:462-70. [PMID: 22999258 DOI: 10.1016/j.virol.2012.08.046] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Revised: 07/06/2012] [Accepted: 08/29/2012] [Indexed: 11/28/2022]
Abstract
Hepatitis C virus (HCV) causes liver diseases, such as hepatitis, liver cirrhosis, steatosis, and hepatocellular carcinoma. To understand the life cycle and pathogenesis of HCV, the one-step growth of HCV in a cell culture system was analyzed using a highly infectious variant of the JFH1 clone. The observed profiles of HCV RNA replication indicated that the synthesis of negative-strand RNAs occurred at 6 h (h) after infection, followed by the active synthesis of positive-strand RNAs. Our measurements of infectious virus production showed that the latent period of HCV was about 12 h. The specific infectivity of HCV particles (focus-forming unit per viral RNA molecule) secreted to the extracellular milieu early in infection was about 30-fold higher than that secreted later during infection. The buoyant densities of the infectious virion particles differed with the duration of infection, indicating changes in the compositions of the virion particles.
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Affiliation(s)
- Sun Ju Keum
- Department of Life Science, POSTECH Biotech Center, Pohang University of Science and Technology, Pohang, South Korea
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Development of a strand specific real-time RT-qPCR assay for the detection and quantitation of murine norovirus RNA. J Virol Methods 2012; 184:69-76. [PMID: 22626565 DOI: 10.1016/j.jviromet.2012.05.012] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2012] [Revised: 05/11/2012] [Accepted: 05/15/2012] [Indexed: 11/22/2022]
Abstract
Murine norovirus (MNV), currently the only norovirus that efficiently replicates in cell culture, is often used as a model system to understand the molecular mechanisms of norovirus replication. MNV is a single stranded positive sense RNA virus of the Caliciviridae family. Replication of MNV involves the synthesis of both full length genomic and sub-genomic RNAs. The replication of these RNAs involves the synthesis of negative strand intermediates. To understand the molecular mechanism of RNA replication and the role of viral and host factors in virus replication, it is necessary to quantify accurately both positive and negative sense RNA molecules of the viral RNA during replication. Increasingly, strand specific reverse transcription-quantitative PCR (RT-qPCR) is becoming the method of choice for this kind of quantitation. Many strategies have been developed to avoid the false priming property of reverse transcriptase and to amplify specifically one strand in the presence of excess opposite strand. In this report, a SYBR based, real time RT-qPCR assay was developed to detect and quantify specifically the negative and the positive sense RNAs of MNV genomic RNA. This assay is based on using a tagged RT primer containing a non-viral sequence at the 5' end of the viral strand specific sequence. This non-viral sequence is then used to amplify selectively the strand specific cDNA at the PCR stage. This assay can be used for a range of MNV strains including MNV-1 and 3, as these are now widely accepted for use in molecular studies. The specificity of this assay was determined by its ability to quantify one strand in the presence of up to 10(6) copies of competitor opposite sense RNA. Using this assay, the production of both strands of MNV-1 RNA was monitored during viral single step growth curve.
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Martínez F, Sardanyés J, Elena SF, Daròs JA. Dynamics of a plant RNA virus intracellular accumulation: stamping machine vs. geometric replication. Genetics 2011; 188:637-46. [PMID: 21515574 PMCID: PMC3176528 DOI: 10.1534/genetics.111.129114] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2011] [Accepted: 04/16/2011] [Indexed: 01/26/2023] Open
Abstract
The tremendous evolutionary potential of RNA viruses allows them to thrive despite host defense mechanisms and endows them with properties such as emergence, host switching, and virulence. The frequency of mutant viruses after an infectious process results from the interplay between the error rate of the viral replicase, from purifying mechanisms acting after transcription on aberrant RNAs, and from the amplification dynamics of virus RNA positive (+) and negative (-) strands. Two extreme scenarios describing viral RNA amplification are the geometric growth, in which each RNA strand serves as template for the synthesis of complementary strands with the same efficiency, and the stamping machine, where a strand is reiteratively used as template to synthesize multiple copies of the complementary. The resulting mutation frequencies are completely different, being geometric growth largely more mutagenic than stamping machine. In this work we evaluate the contribution of geometric growth and stamping machine to the overall genome amplification of the plant (+)-strand RNA virus turnip mosaic virus (TuMV). By means of transfection experiments of Nicotiana benthamiana protoplasts with a TuMV cDNA infectious clone and by using strand-specific quantitative real-time PCR, we determined the amplification dynamics of viral (+) and (-) RNA during a single-cell infectious process. A mathematical model describing the amplification of each viral strand was fitted to the data. Analyses of the model parameters showed that TuMV (+) and (-) RNA amplification occurs through a mixed strategy with ∼93% of genomes produced via stamping machine and only ∼7% resulting from geometric growth.
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Affiliation(s)
- Fernando Martínez
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas – Universidad Politécnica de Valencia), Valencia, Spain
| | - Josep Sardanyés
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas – Universidad Politécnica de Valencia), Valencia, Spain
| | - Santiago F. Elena
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas – Universidad Politécnica de Valencia), Valencia, Spain
- Santa Fe Institute, Santa Fe, NM 87501, USA
| | - José-Antonio Daròs
- Instituto de Biología Molecular y Celular de Plantas (Consejo Superior de Investigaciones Científicas – Universidad Politécnica de Valencia), Valencia, Spain
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Moison C, Arimondo PB, Guieysse-Peugeot AL. Commercial reverse transcriptase as source of false-positive strand-specific RNA detection in human cells. Biochimie 2011; 93:1731-7. [PMID: 21689721 DOI: 10.1016/j.biochi.2011.06.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2011] [Accepted: 06/07/2011] [Indexed: 10/18/2022]
Abstract
Recently, an increasing number of studies describe the existence of non-coding RNAs (ncRNAs) involved in gene expression modulation. Since the observation that antisense ncRNAs are implicated in human disorders, there is more and more interest in ncRNAs. A commonly used technique to investigate the expression of an antisense ncRNAs is strand-specific reverse transcription coupled with polymerase chain reaction (RT-PCR). The advantage of this accurate technique is that it does not require any special equipment or expertise. The disadvantage is that it can lead easily to false-positive results. We applied strand-specific RT-PCR to investigate the presence of antisense ncRNA associated to Retinoic Acid Receptor Beta 2 (RARβ2) in different human tumoral cell lines. By performing this technique, we observed false-positive detection of ncRNA. For accurate interpretation of the results in RT-PCR experiments, we introduced a «No primer» control that reveals non-specific cDNA synthesis. Moreover, we report the presence of non-specific cDNA amplification with five of the most frequently used reverse transcriptase in absence of added primers. We found that the choice of the reverse transcriptase as well as the conditions of the reaction (RT temperature and PCR cycle number) are important parameters to choose as the different reverse transcriptases do not display the same cDNA synthesis background. This previously observed phenomenon was reported to originate from the «self-priming» of RNA template. Here, we report rather the presence of RNA contaminants associated with one of the reverse transcriptase studied that might contribute to non-specific cDNA synthesis.
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Affiliation(s)
- Celine Moison
- MNHN CNRS UMR7196 43 rue Cuvier, 75005 Paris, France
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Bannister R, Rodrigues D, Murray EJ, Laxton C, Westby M, Bright H. Use of a highly sensitive strand-specific quantitative PCR to identify abortive replication in the mouse model of respiratory syncytial virus disease. Virol J 2010; 7:250. [PMID: 20860795 PMCID: PMC2954858 DOI: 10.1186/1743-422x-7-250] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 09/22/2010] [Indexed: 01/02/2023] Open
Abstract
Background The BALB/c mouse is commonly used to study RSV infection and disease. However, despite the many advantages of this well-characterised model, the inoculum is large, viral replication is restricted and only a very small amount of virus can be recovered from infected animals. A key question in this model is the fate of the administered virus. Is replication really being measured or is the model measuring the survival of the virus over time? To answer these questions we developed a highly sensitive strand-specific quantitative PCR (QPCR) able to accurately quantify the amount of RSV replication in the BALB/c mouse lung, allowing characterisation of RSV negative and positive strand RNA dynamics. Results In the mouse lung, no increase in RSV genome was seen above the background of the original inoculum whilst only a limited transient increase (< 1 log) in positive strand, replicative intermediate (RI) RNA occurred. This RNA did however persist at detectable levels for 59 days post infection. As expected, ribavirin therapy reduced levels of infectious virus and RI RNA in the mouse lung. However, whilst Palivizumab therapy was also able to reduce levels of infectious virus, it failed to prevent production of intracellular RI RNA. A comparison of RSV RNA kinetics in human (A549) and mouse (KLN205) cell lines demonstrated that RSV replication was also severely delayed and impaired in vitro in the mouse cells. Conclusions This is the first time that such a sensitive strand-specific QPCR technique has been to the RSV mouse system. We have accurately quantified the restricted and abortive nature of RSV replication in the mouse. Further in vitro studies in human and mouse cells suggest this restricted replication is due at least in part to species-specific host cell-viral interactions.
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Affiliation(s)
- Richard Bannister
- Infectious Diseases Group, Pfizer Global Research and Development, Sandwich, Kent CT13 9NJ, UK
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Development and validation of four Real-Time quantitative RT-PCRs specific for the positive or negative strands of a bisegmented dsRNA viral genome. J Virol Methods 2010; 170:1-8. [PMID: 20638414 DOI: 10.1016/j.jviromet.2010.07.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2010] [Revised: 07/07/2010] [Accepted: 07/12/2010] [Indexed: 02/07/2023]
Abstract
Four tagged quantitative Real-Time RT-PCRs (qRT-PCRs) were developed to quantify the positive and negative strands of segments A and B of the bisegmented double-stranded RNA (dsRNA) genome of infectious bursal disease virus (IBDV, family Birnaviridae, genus Avibirnavirus). The qRT-PCRs were validated using single-stranded RNAs corresponding to each genomic strand (A+, B+, A-, B-). Specific quantitation proved possible from 5×10(7) to 5×10(2) copies of the template per reaction, with excellent reproducibility and linearity. The methods detected similar amounts of A+ and A- and of B+ and B- in a purified dsRNA viral genome preparation, thus corroborating the accuracy of quantitation. The qRT-PCRs were used to quantify the four strands in CsCl purified virus fractions and in samples collected during propagation of IBDV in cell culture. Purified virus fractions contained similar amounts of A- and B- strands, but also a large and unexplained excess of A+ and even more B+ strands. Results of the in vitro kinetic study showed an early accumulation of positive strands and a more delayed and lower accumulation of the A- and B- strands, both in similar amounts. These results suggest that minus strand synthesis occurs in IBDV after the equimolar packaging of A+ and B+ strands.
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Jang SY, Jeong WH, Kim MS, Lee YM, Lee JI, Lee GC, Paik SY, Koh GP, Kim JM, Lee CH. Detection of replicating negative-sense RNAs in CaCo-2 cells infected with human astrovirus. Arch Virol 2010; 155:1383-9. [PMID: 20544235 DOI: 10.1007/s00705-010-0718-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2009] [Accepted: 05/31/2010] [Indexed: 10/19/2022]
Abstract
Human astrovirus (HAstV) is the second most important cause of viral diarrhea and acute gastroenteritis in infants under five. However, determination of the infectivity of clinical isolates is difficult, and the replication cycle of HAstV is not yet fully understood. In this study, it was attempted to detect negative-sense (-)RNAs generated during the replication of RNA viruses. We used clinical isolates of HAstV to infect CaCo-2 cells. Reverse transcription using only a sense primer followed by PCR using both sense and antisense primers showed that (-)RNAs were first detected in CaCo-2 cells between 9 and 12 h postinfection (p.i.). However, these (-)RNAs were not detected when cells were treated with the protein synthesis inhibitor cycloheximide during HAstV infection. Next, RT with only an antisense primer followed by PCR was performed to detect (+)RNA of HAstVs after production of (-)RNAs during replication. RT-PCR results using the antisense primer revealed that the amount of (+)RNA began to increase starting 9 h p.i., indicating an accumulation of the newly synthesized (+)RNA genome. Cycloheximide was observed to abrogate the increase of newly made (+)RNA during HAstV infection. In conclusion, the use of sense or antisense primers during the RT reaction together with cycloheximide enabled us to quantitatively detect (-)RNAs, and this proved to be an useful tool in understanding the replication cycle of HAstV.
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Affiliation(s)
- So Young Jang
- Department of Microbiology, College of Natural Sciences, Chungbuk National University, Cheongju, Chungbuk, South Korea
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Zhang M, Zhao H, Yang J, Jiang S, Cai B. Detection and quantification of enteroviruses in coastal seawaters from Bohai Bay, Tianjin, China. J Environ Sci (China) 2010; 22:150-154. [PMID: 20397399 DOI: 10.1016/s1001-0742(09)60086-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
An 8-month survey was conducted to detect and quantify enteroviruses in Tianjin coastal seawaters of Bohai Bay to assess coastal water quality. Ten water samples were collected from Bohai Bay for the detection and quantification of enteroviruses by conventional reverse transcription polymerase chain reaction (RT-PCR) and SYBR Green real-time quantitative RT-PCR (qRT-PCR). Total viral nucleic acid was extracted from 500 mL of seawater samples concentrated by Centricon plus-70 centrifugal filter devices. The viral recovery rate was 29.1% based on viral seeding study. The centrifugal ultrafiltration method applied is effective for viral recovery from small volume of polluted water, which may have broader applications to monitoring human virus in aquatic environment. Our results indicated that there was a severe viral contamination in seawater of Bohai Bay. Enteroviruses were detected at concentrations ranging from 1.7 x 10(6) to 6.3 x 10(7) copies/L by qRT-PCR. Sequencing analyses identified that all of the twenty clones as poliovirus type 2. This is the first quantitative report of human viruses in coastal waters of a metropolitan city in China. This study emphasized the importance for the local and central governments to monitor and assess the water quality.
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Affiliation(s)
- Minglu Zhang
- Key Laboratory of Bioactive Materials, Ministry of Education, Department of Microbiology, Nankai University, Tianjin 300071, China.
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Boncristiani HF, Di Prisco G, Pettis JS, Hamilton M, Chen YP. Molecular approaches to the analysis of deformed wing virus replication and pathogenesis in the honey bee, Apis mellifera. Virol J 2009; 6:221. [PMID: 20003360 PMCID: PMC2797523 DOI: 10.1186/1743-422x-6-221] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2009] [Accepted: 12/11/2009] [Indexed: 12/03/2022] Open
Abstract
Background For years, the understanding of the pathogenetic mechanisms that underlie honey bee viral diseases has been severely hindered because of the lack of a cell culture system for virus propagation. As a result, it is very imperative to develop new methods that would permit the in vitro pathogenesis study of honey bee viruses. The identification of virus replication is an important step towards the understanding of the pathogenesis process of viruses in their respective hosts. In the present study, we developed a strand-specific RT-PCR-based method for analysis of Deformed Wing Virus (DWV) replication in honey bees and in honey bee parasitic mites, Varroa Destructor. Results The results shows that the method developed in our study allows reliable identification of the virus replication and solves the problem of falsely-primed cDNA amplifications that commonly exists in the current system. Using TaqMan real-time quantitative RT-PCR incorporated with biotinylated primers and magnetic beads purification step, we characterized the replication and tissue tropism of DWV infection in honey bees. We provide evidence for DWV replication in the tissues of wings, head, thorax, legs, hemolymph, and gut of honey bees and also in Varroa mites. Conclusion The strategy reported in the present study forms a model system for studying bee virus replication, pathogenesis and immunity. This study should be a significant contribution to the goal of achieving a better understanding of virus pathogenesis in honey bees and to the design of appropriate control measures for bee populations at risk to virus infections.
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Tuiskunen A, Leparc-Goffart I, Boubis L, Monteil V, Klingström J, Tolou HJ, Lundkvist A, Plumet S. Self-priming of reverse transcriptase impairs strand-specific detection of dengue virus RNA. J Gen Virol 2009; 91:1019-27. [PMID: 19940062 DOI: 10.1099/vir.0.016667-0] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Dengue virus infection is the most frequent arthropod-borne infection affecting humans in the world. Our understanding of the pathophysiological events leading to mild or severe outcomes of the disease remains limited by the fact that viral target cells in the human body are poorly characterized. One of the most sensitive strategies for detecting cells supporting active replication of this positive-strand RNA virus is the search for the replicative intermediate, an antigenome of negative polarity, by RT-PCR. However, a phenomenon described as 'false priming' of the reverse transcriptase (RT) prevents strand-specific detection. The results of the current study showed that this event corresponds to cDNA synthesis that is independent of any primer addition. This property was general to all RNAs tested and was not associated with small free nucleic acids, such as tRNAs and microRNAs. Rather, it corresponded to initiation of cDNA synthesis from the 3' end of the RNA template, and a model is proposed in which the template RNA snaps back upon itself and creates a transient RNA primer suitable for the RT. Such a property would explain why many assays proposed for detection of a replicative intermediate are not specific, and may help in the development of a molecular biology protocol that could allow replication studies of RNA viruses of human interest, such as dengue virus, hepatitis C virus and enteroviruses.
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Affiliation(s)
- A Tuiskunen
- Unité de Virologie Tropicale, IRBA-Marseille (IMTSSA), allée du Med. Col. Jamot, Parc du Pharo, BP 60109, 13262 Marseille Cedex 07, France
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Boncristiani HF, Rossi RD, Criado MF, Furtado FM, Arruda E. Magnetic purification of biotinylated cDNA removes false priming and ensures strand-specificity of RT-PCR for enteroviral RNAs. J Virol Methods 2009; 161:147-53. [DOI: 10.1016/j.jviromet.2009.06.006] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2008] [Revised: 06/01/2009] [Accepted: 06/04/2009] [Indexed: 10/20/2022]
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