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Lewis J, Gallichotte EN, Randall J, Glass A, Foy BD, Ebel GD, Kading RC. Intrinsic factors driving mosquito vector competence and viral evolution: a review. Front Cell Infect Microbiol 2023; 13:1330600. [PMID: 38188633 PMCID: PMC10771300 DOI: 10.3389/fcimb.2023.1330600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 12/08/2023] [Indexed: 01/09/2024] Open
Abstract
Mosquitoes are responsible for the transmission of numerous viruses of global health significance. The term "vector competence" describes the intrinsic ability of an arthropod vector to transmit an infectious agent. Prior to transmission, the mosquito itself presents a complex and hostile environment through which a virus must transit to ensure propagation and transmission to the next host. Viruses imbibed in an infectious blood meal must pass in and out of the mosquito midgut, traffic through the body cavity or hemocoel, invade the salivary glands, and be expelled with the saliva when the vector takes a subsequent blood meal. Viruses encounter physical, cellular, microbial, and immunological barriers, which are influenced by the genetic background of the mosquito vector as well as environmental conditions. Collectively, these factors place significant selective pressure on the virus that impact its evolution and transmission. Here, we provide an overview of the current state of the field in understanding the mosquito-specific factors that underpin vector competence and how each of these mechanisms may influence virus evolution.
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Affiliation(s)
- Juliette Lewis
- Center for Vector-borne Infectious Diseases, Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO, United States
| | - Emily N. Gallichotte
- Center for Vector-borne Infectious Diseases, Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO, United States
| | - Jenna Randall
- Center for Vector-borne Infectious Diseases, Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO, United States
| | - Arielle Glass
- Department of Cellular and Molecular Biology, Colorado State University, Fort Collins, CO, United States
| | - Brian D. Foy
- Center for Vector-borne Infectious Diseases, Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO, United States
| | - Gregory D. Ebel
- Center for Vector-borne Infectious Diseases, Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO, United States
| | - Rebekah C. Kading
- Center for Vector-borne Infectious Diseases, Department of Microbiology, Immunology, and Pathology, Colorado State University, Fort Collins, CO, United States
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Jaeger AS, Marano J, Riemersma KK, Castaneda D, Pritchard EM, Pritchard JC, Bohm EK, Baczenas JJ, O'Connor SL, Weger-Lucarelli J, Friedrich TC, Aliota MT. Gain without pain: adaptation and increased virulence of Zika virus in vertebrate host without fitness cost in mosquito vector. J Virol 2023; 97:e0116223. [PMID: 37800949 PMCID: PMC10653995 DOI: 10.1128/jvi.01162-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Accepted: 08/21/2023] [Indexed: 10/07/2023] Open
Abstract
IMPORTANCE Previously, we modeled direct transmission chains of Zika virus (ZIKV) by serially passaging ZIKV in mice and mosquitoes and found that direct mouse transmission chains selected for viruses with increased virulence in mice and the acquisition of non-synonymous amino acid substitutions. Here, we show that these same mouse-passaged viruses also maintain fitness and transmission capacity in mosquitoes. We used infectious clone-derived viruses to demonstrate that the substitution in nonstructural protein 4A contributes to increased virulence in mice.
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Affiliation(s)
- Anna S. Jaeger
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, Minnesota, USA
| | - Jeffrey Marano
- Department of Biomedical Sciences and Pathobiology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
| | - Kasen K. Riemersma
- Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - David Castaneda
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, Minnesota, USA
| | - Elise M. Pritchard
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, Minnesota, USA
| | - Julia C. Pritchard
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, Minnesota, USA
| | - Ellie K. Bohm
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, Minnesota, USA
| | - John J. Baczenas
- Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, Madison, Wisconsin, USA
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Shelby L. O'Connor
- Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, Madison, Wisconsin, USA
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - James Weger-Lucarelli
- Department of Biomedical Sciences and Pathobiology, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA
| | - Thomas C. Friedrich
- Department of Pathobiological Sciences, University of Wisconsin-Madison, Madison, Wisconsin, USA
- Wisconsin National Primate Research Center, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Matthew T. Aliota
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, Minnesota, USA
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3
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Boehm EC, Jaeger AS, Ries HJ, Castañeda D, Weiler AM, Valencia CC, Weger-Lucarelli J, Ebel GD, O’Connor SL, Friedrich TC, Zamanian M, Aliota MT. Wolbachia-mediated resistance to Zika virus infection in Aedes aegypti is dominated by diverse transcriptional regulation and weak evolutionary pressures. PLoS Negl Trop Dis 2023; 17:e0011674. [PMID: 37782672 PMCID: PMC10569609 DOI: 10.1371/journal.pntd.0011674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 10/12/2023] [Accepted: 09/13/2023] [Indexed: 10/04/2023] Open
Abstract
A promising candidate for arbovirus control and prevention relies on replacing arbovirus-susceptible Aedes aegypti populations with mosquitoes that have been colonized by the intracellular bacterium Wolbachia and thus have a reduced capacity to transmit arboviruses. This reduced capacity to transmit arboviruses is mediated through a phenomenon referred to as pathogen blocking. Pathogen blocking has primarily been proposed as a tool to control dengue virus (DENV) transmission, however it works against a range of viruses, including Zika virus (ZIKV). Despite years of research, the molecular mechanisms underlying pathogen blocking still need to be better understood. Here, we used RNA-seq to characterize mosquito gene transcription dynamics in Ae. aegypti infected with the wMel strain of Wolbachia that are being released by the World Mosquito Program in Medellín, Colombia. Comparative analyses using ZIKV-infected, uninfected tissues, and mosquitoes without Wolbachia revealed that the influence of wMel on mosquito gene transcription is multifactorial. Importantly, because Wolbachia limits, but does not completely prevent, replication of ZIKV and other viruses in coinfected mosquitoes, there is a possibility that these viruses could evolve resistance to pathogen blocking. Therefore, to understand the influence of Wolbachia on within-host ZIKV evolution, we characterized the genetic diversity of molecularly barcoded ZIKV virus populations replicating in Wolbachia-infected mosquitoes and found that within-host ZIKV evolution was subject to weak purifying selection and, unexpectedly, loose anatomical bottlenecks in the presence and absence of Wolbachia. Together, these findings suggest that there is no clear transcriptional profile associated with Wolbachia-mediated ZIKV restriction, and that there is no evidence for ZIKV escape from this restriction in our system.
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Affiliation(s)
- Emma C. Boehm
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, Minnesota, United States of America
| | - Anna S. Jaeger
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, Minnesota, United States of America
| | - Hunter J. Ries
- Department of Pathobiological Sciences, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - David Castañeda
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, Minnesota, United States of America
| | - Andrea M. Weiler
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Corina C. Valencia
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - James Weger-Lucarelli
- Virginia Polytechnic Institute and State University, Blacksburg, Virginia, United States of America
| | - Gregory D. Ebel
- Colorado State University, Fort Collins, Colorado, United States of America
| | - Shelby L. O’Connor
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- Department of Pathology and Laboratory Medicine, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Thomas C. Friedrich
- Department of Pathobiological Sciences, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
- Wisconsin National Primate Research Center, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Mostafa Zamanian
- Department of Pathobiological Sciences, University of Wisconsin–Madison, Madison, Wisconsin, United States of America
| | - Matthew T. Aliota
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities, Minnesota, United States of America
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Fitzmeyer EA, Gallichotte EN, Ebel GD. Scanning barcodes: A way to explore viral populations. PLoS Pathog 2023; 19:e1011291. [PMID: 37079527 PMCID: PMC10118115 DOI: 10.1371/journal.ppat.1011291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/21/2023] Open
Affiliation(s)
- Emily A. Fitzmeyer
- Center for Vector-borne Infectious Diseases, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, United States of America
| | - Emily N. Gallichotte
- Center for Vector-borne Infectious Diseases, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, United States of America
| | - Gregory D. Ebel
- Center for Vector-borne Infectious Diseases, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, Colorado, United States of America
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Jaeger AS, Marano J, Riemersma K, Castañeda D, Pritchard E, Pritchard J, Bohm EK, Baczenas JJ, O’Connor SL, Weger-Lucarelli J, Friedrich TC, Aliota MT. Gain without pain: Adaptation and increased virulence of Zika virus in vertebrate host without fitness cost in mosquito vector. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.03.20.533515. [PMID: 36993525 PMCID: PMC10055270 DOI: 10.1101/2023.03.20.533515] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
Zika virus (ZIKV) is now in a post-pandemic period, for which the potential for re-emergence and future spread is unknown. Adding to this uncertainty is the unique capacity of ZIKV to directly transmit between humans via sexual transmission. Recently, we demonstrated that direct transmission of ZIKV between vertebrate hosts leads to rapid adaptation resulting in enhanced virulence in mice and the emergence of three amino acid substitutions (NS2A-A117V, NS2A-A117T, and NS4A-E19G) shared among all vertebrate-passaged lineages. Here, we further characterized these host-adapted viruses and found that vertebrate-passaged viruses also have enhanced transmission potential in mosquitoes. To understand the contribution of genetic changes to the enhanced virulence and transmission phenotype, we engineered these amino acid substitutions, singly and in combination, into a ZIKV infectious clone. We found that NS4A-E19G contributed to the enhanced virulence and mortality phenotype in mice. Further analyses revealed that NS4A-E19G results in increased neurotropism and distinct innate immune signaling patterns in the brain. None of the substitutions contributed to changes in transmission potential in mosquitoes. Together, these findings suggest that direct transmission chains could enable the emergence of more virulent ZIKV strains without compromising mosquito transmission capacity, although the underlying genetics of these adaptations are complex.
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Affiliation(s)
- Anna S. Jaeger
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities
| | - Jeffrey Marano
- Department of Biomedical Sciences and Pathobiology, Virginia Polytechnic Institute and State University
| | - Kasen Riemersma
- Department of Pathobiological Sciences, University of Wisconsin-Madison
| | - David Castañeda
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities
| | - Elise Pritchard
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities
| | - Julia Pritchard
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities
| | - Ellie K. Bohm
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities
| | - John J. Baczenas
- Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, United States
- Wisconsin National Primate Research Center, University of Wisconsin-Madison
| | - Shelby L. O’Connor
- Department of Pathology and Laboratory Medicine, University of Wisconsin-Madison, United States
- Wisconsin National Primate Research Center, University of Wisconsin-Madison
| | - James Weger-Lucarelli
- Department of Biomedical Sciences and Pathobiology, Virginia Polytechnic Institute and State University
| | - Thomas C. Friedrich
- Department of Pathobiological Sciences, University of Wisconsin-Madison
- Wisconsin National Primate Research Center, University of Wisconsin-Madison
| | - Matthew T. Aliota
- Department of Veterinary and Biomedical Sciences, University of Minnesota, Twin Cities
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Rodríguez‐Pastor R, Shafran Y, Knossow N, Gutiérrez R, Harrus S, Zaman L, Lenski RE, Barrick JE, Hawlena H. A road map for in vivo evolution experiments with blood-borne parasitic microbes. Mol Ecol Resour 2022; 22:2843-2859. [PMID: 35599628 PMCID: PMC9796859 DOI: 10.1111/1755-0998.13649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2021] [Revised: 03/14/2022] [Accepted: 05/13/2022] [Indexed: 01/07/2023]
Abstract
Laboratory experiments in which blood-borne parasitic microbes evolve in their animal hosts offer an opportunity to study parasite evolution and adaptation in real time and under natural settings. The main challenge of these experiments is to establish a protocol that is both practical over multiple passages and accurately reflects natural transmission scenarios and mechanisms. We provide a guide to the steps that should be considered when designing such a protocol, and we demonstrate its use via a case study. We highlight the importance of choosing suitable ancestral genotypes, treatments, number of replicates per treatment, types of negative controls, dependent variables, covariates, and the timing of checkpoints for the experimental design. We also recommend specific preliminary experiments to determine effective methods for parasite quantification, transmission, and preservation. Although these methodological considerations are technical, they also often have conceptual implications. To this end, we encourage other researchers to design and conduct in vivo evolution experiments with blood-borne parasitic microbes, despite the challenges that the work entails.
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Affiliation(s)
- Ruth Rodríguez‐Pastor
- Jacob Blaustein Center for Scientific Cooperation, The Jacob Blaustein Institutes for Desert ResearchBen‐Gurion University of the NegevMidreshet Ben‐GurionIsrael
| | - Yarden Shafran
- Mitrani Department of Desert Ecology, Swiss Institute for Dryland Environmental and Energy Research, The Jacob Blaustein Institutes for Desert ResearchBen‐Gurion University of the NegevMidreshet Ben‐GurionIsrael
| | - Nadav Knossow
- Mitrani Department of Desert Ecology, Swiss Institute for Dryland Environmental and Energy Research, The Jacob Blaustein Institutes for Desert ResearchBen‐Gurion University of the NegevMidreshet Ben‐GurionIsrael
| | - Ricardo Gutiérrez
- Koret School of Veterinary Medicine, Faculty of Agricultural, Nutritional and Environmental SciencesThe Hebrew University of JerusalemRehovotIsrael
| | - Shimon Harrus
- Koret School of Veterinary Medicine, Faculty of Agricultural, Nutritional and Environmental SciencesThe Hebrew University of JerusalemRehovotIsrael
| | - Luis Zaman
- Department of Ecology and Evolutionary Biology, The Center for the Study of Complex Systems (CSCS)University of MichiganAnn ArborMichiganUSA
| | - Richard E. Lenski
- Department of Microbiology and Molecular GeneticsMichigan State UniversityEast LansingMichiganUSA
| | - Jeffrey E. Barrick
- Department of Molecular BiosciencesThe University of Texas AustinAustinTexasUSA
| | - Hadas Hawlena
- Mitrani Department of Desert Ecology, Swiss Institute for Dryland Environmental and Energy Research, The Jacob Blaustein Institutes for Desert ResearchBen‐Gurion University of the NegevMidreshet Ben‐GurionIsrael
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Rochman ND, Wolf YI, Koonin EV. Molecular adaptations during viral epidemics. EMBO Rep 2022; 23:e55393. [PMID: 35848484 PMCID: PMC9346483 DOI: 10.15252/embr.202255393] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Revised: 06/18/2022] [Accepted: 06/27/2022] [Indexed: 07/20/2023] Open
Abstract
In 1977, the world witnessed both the eradication of smallpox and the beginning of the modern age of genomics. Over the following half-century, 7 epidemic viruses of international concern galvanized virologists across the globe and led to increasingly extensive virus genome sequencing. These sequencing efforts exerted over periods of rapid adaptation of viruses to new hosts, in particular, humans provide insight into the molecular mechanisms underpinning virus evolution. Investment in virus genome sequencing was dramatically increased by the unprecedented support for phylogenomic analyses during the COVID-19 pandemic. In this review, we attempt to piece together comprehensive molecular histories of the adaptation of variola virus, HIV-1 M, SARS, H1N1-SIV, MERS, Ebola, Zika, and SARS-CoV-2 to the human host. Disruption of genes involved in virus-host interaction in animal hosts, recombination including genome segment reassortment, and adaptive mutations leading to amino acid replacements in virus proteins involved in host receptor binding and membrane fusion are identified as the key factors in the evolution of epidemic viruses.
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Affiliation(s)
- Nash D Rochman
- National Center for Biotechnology InformationNational Library of MedicineBethesdaMDUSA
| | - Yuri I Wolf
- National Center for Biotechnology InformationNational Library of MedicineBethesdaMDUSA
| | - Eugene V Koonin
- National Center for Biotechnology InformationNational Library of MedicineBethesdaMDUSA
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Pinto AK, Hassert M, Han X, Barker D, Carnelley T, Branche E, Steffen TL, Stone ET, Geerling E, Viramontes KM, Nykiforuk C, Toth D, Shresta S, Kodihalli S, Brien JD. The Ability of Zika virus Intravenous Immunoglobulin to Protect From or Enhance Zika Virus Disease. Front Immunol 2021; 12:717425. [PMID: 34552587 PMCID: PMC8450494 DOI: 10.3389/fimmu.2021.717425] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2021] [Accepted: 08/09/2021] [Indexed: 11/21/2022] Open
Abstract
The closely related flaviviruses, dengue and Zika, cause significant human disease throughout the world. While cross-reactive antibodies have been demonstrated to have the capacity to potentiate disease or mediate protection during flavivirus infection, the mechanisms responsible for this dichotomy are still poorly understood. To understand how the human polyclonal antibody response can protect against, and potentiate the disease in the context of dengue and Zika virus infection we used intravenous hyperimmunoglobulin (IVIG) preparations in a mouse model of the disease. Three IVIGs (ZIKV-IG, Control-Ig and Gamunex®) were evaluated for their ability to neutralize and/or enhance Zika, dengue 2 and 3 viruses in vitro. The balance between virus neutralization and enhancement provided by the in vitro neutralization data was used to predict the IVIG concentrations which could protect or enhance Zika, and dengue 2 disease in vivo. Using this approach, we were able to define the unique in vivo dynamics of complex polyclonal antibodies, allowing for both enhancement and protection from flavivirus infection. Our results provide a novel understanding of how polyclonal antibodies interact with viruses with implications for the use of polyclonal antibody therapeutics and the development and evaluation of the next generation flavivirus vaccines.
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Affiliation(s)
- Amelia K. Pinto
- Department of Molecular Microbiology and Immunology, Saint Louis University, St Louis, MO, United States
| | - Mariah Hassert
- Department of Molecular Microbiology and Immunology, Saint Louis University, St Louis, MO, United States
| | - Xiaobing Han
- Emergent BioSolutions Canada Inc, Winnipeg, Canada
| | | | | | - Emilie Branche
- La Jolla Institute for Immunology, Center for Infectious Disease and Vaccine Research, La Jolla, CA, United States
| | - Tara L. Steffen
- Department of Molecular Microbiology and Immunology, Saint Louis University, St Louis, MO, United States
| | - E. Taylor Stone
- Department of Molecular Microbiology and Immunology, Saint Louis University, St Louis, MO, United States
| | - Elizabeth Geerling
- Department of Molecular Microbiology and Immunology, Saint Louis University, St Louis, MO, United States
| | - Karla M. Viramontes
- La Jolla Institute for Immunology, Center for Infectious Disease and Vaccine Research, La Jolla, CA, United States
| | | | - Derek Toth
- Emergent BioSolutions Canada Inc, Winnipeg, Canada
| | - Sujan Shresta
- La Jolla Institute for Immunology, Center for Infectious Disease and Vaccine Research, La Jolla, CA, United States
| | | | - James D. Brien
- Department of Molecular Microbiology and Immunology, Saint Louis University, St Louis, MO, United States
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Abstract
Recent field trials have demonstrated that dengue incidence can be substantially reduced by introgressing strains of the endosymbiotic bacterium Wolbachia into Aedes aegypti mosquito populations. This strategy relies on Wolbachia reducing the susceptibility of Ae. aegypti to disseminated infection by positive-sense RNA viruses like dengue. However, RNA viruses are well known to adapt to antiviral pressures. Here, we review the viral infection stages where selection for Wolbachia-resistant virus variants could occur. We also consider the genetic constraints imposed on viruses that alternate between vertebrate and invertebrate hosts, and the likely selection pressures to which dengue virus might adapt in order to be effectively transmitted by Ae. aegypti that carry Wolbachia. While there are hurdles to dengue viruses developing resistance to Wolbachia, we suggest that long-term surveillance for resistant viruses should be an integral component of Wolbachia-introgression biocontrol programs.
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Affiliation(s)
| | - Heather A. Flores
- Institute of Vector-Borne Disease, Monash University, Clayton, Victoria, Australia
| | - Cameron P. Simmons
- World Mosquito Program, Institute of Vector-Borne Disease, Monash University, Clayton, Victoria, Australia
- Oxford University Clinical Research Unit, Ho Chi Minh City, Vietnam
- Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Johanna E. Fraser
- Institute of Vector-Borne Disease, Monash University, Clayton, Victoria, Australia
- Department of Microbiology, Monash Biomedicine Discovery Institute, Monash University, Clayton, Victoria, Australia
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