51
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Pereira Cabral B, da Graça Derengowski Fonseca M, Mota FB. Long term prevention and vector control of arboviral diseases: What does the future hold? Int J Infect Dis 2019; 89:169-174. [DOI: 10.1016/j.ijid.2019.10.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 10/01/2019] [Accepted: 10/02/2019] [Indexed: 12/23/2022] Open
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52
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Meta-Transcriptomic Comparison of the RNA Viromes of the Mosquito Vectors Culex pipiens and Culex torrentium in Northern Europe. Viruses 2019; 11:v11111033. [PMID: 31698792 PMCID: PMC6893722 DOI: 10.3390/v11111033] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 11/04/2019] [Accepted: 11/05/2019] [Indexed: 01/08/2023] Open
Abstract
Mosquitoes harbor an extensive diversity of ‘insect-specific’ RNA viruses in addition to those important to human and animal health. However, because most studies of the mosquito virome have been conducted at lower latitudes, little is known about the diversity and evolutionary history of RNA viruses sampled from mosquitoes in northerly regions. Here, we compared the RNA virome of two common northern mosquito species, Culex pipiens and Culex torrentium, collected in south-central Sweden. Following bulk RNA-sequencing (meta-transcriptomics) of 12 libraries, comprising 120 specimens of Cx. pipiens and 150 specimens of Cx. torrentium, we identified 40 viruses (representing 14 virus families) of which 28 were novel based on phylogenetic analysis of the RNA-dependent RNA polymerase (RdRp) protein. Hence, we documented similar levels of virome diversity as in mosquitoes sampled from the more biodiverse lower latitudes. Many viruses were also related to those sampled on other continents, indicative of a widespread global movement and/or long host–virus co-evolution. Although the two mosquito species investigated have overlapping geographical distributions and share many viruses, several viruses were only found at a specific location at this scale of sampling, such that local habitat and geography may play an important role in shaping viral diversity in Culex mosquitoes.
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53
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Nainu F, Trenerry A, Johnson KN. Wolbachia-mediated antiviral protection is cell-autonomous. J Gen Virol 2019; 100:1587-1592. [PMID: 31599711 DOI: 10.1099/jgv.0.001342] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Vector-borne viral diseases pose significant risks to human health. To control the transmission of these viruses, a number of approaches are required. The ability of the intracellular bacteria Wolbachia to limit viral accumulation and transmission in some arthropod hosts, highlights its potential as a biocontrol agent. Whilst Wolbachia can reduce the transmission of several epidemiologically important viruses, protection is not consistent amongst all insects, viruses and strains of Wolbachia, which confounds elucidation of the mechanisms that underly this protection. Evidence of different mechanisms has emerged, but is not always consistent, suggesting the tripartite interaction may be complex. Here we provide evidence that Wolbachia-mediated antiviral protection is dependent on the presence of Wolbachia in individual cells, and cannot be conferred to surrounding cells. Our results suggest that protection is cell-autonomous, and this has several mechanistic implications, which can direct future research.
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Affiliation(s)
- Firzan Nainu
- School of Biological Sciences, University of Queensland, Brisbane, Australia.,Faculty of Pharmacy, Hasanuddin University, Makassar, Indonesia
| | - Alice Trenerry
- School of Biological Sciences, University of Queensland, Brisbane, Australia
| | - Karyn N Johnson
- School of Biological Sciences, University of Queensland, Brisbane, Australia
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54
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Fisher ML, Levine JF, Guy JS, Mochizuki H, Breen M, Schal C, Watson DW. Lack of influence by endosymbiont Wolbachia on virus titer in the common bed bug, Cimex lectularius. Parasit Vectors 2019; 12:436. [PMID: 31500667 PMCID: PMC6734260 DOI: 10.1186/s13071-019-3694-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2019] [Accepted: 08/31/2019] [Indexed: 01/23/2023] Open
Abstract
BACKGROUND The common bed bug, Cimex lectularius, is an obligatory blood-feeding ectoparasite that requires a blood meal to molt and produce eggs. Their frequent biting to obtain blood meals and intimate association with humans increase the potential for disease transmission. However, despite more than 100 years of inquiry into bed bugs as potential disease vectors, they still have not been conclusively linked to any pathogen or disease. This ecological niche is extraordinarily rare, given that nearly every other blood-feeding arthropod is associated with some type of human or zoonotic disease. Bed bugs rely on the bacteria Wolbachia as an obligate endosymbiont to biosynthesize B vitamins, since they acquire a nutritionally deficient diet, but it is unknown if Wolbachia confers additional benefits to its bed bug host. In some insects, Wolbachia induces resistance to viruses such as Dengue, Chikungunya, West Nile, Drosophila C and Zika, and primes the insect immune system in other blood-feeding insects. Wolbachia might have evolved a similar role in its mutualistic association with the bed bug. In this study, we evaluated the influence of Wolbachia on virus replication within C. lectularius. METHODS We used feline calicivirus as a model pathogen. We fed 40 bed bugs from an established line of Wolbachia-cured and a line of Wolbachia-positive C. lectularius a virus-laden blood meal, and quantified the amount of virus over five time intervals post-feeding. The antibiotic rifampicin was used to cure bed bugs of Wolbachia. RESULTS There was a significant effect of time post-feeding, as the amount of virus declined by ~90% over 10 days in both groups, but no significant difference in virus titer was observed between the Wolbachia-positive and Wolbachia-cured groups. CONCLUSIONS These findings suggest that other mechanisms are involved in virus suppression within bed bugs, independent of the influence of Wolbachia, and our conclusions underscore the need for future research.
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Affiliation(s)
- Michael L. Fisher
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC USA
- United States Navy Medical Service Corps, Raleigh, NC USA
| | - Jay F. Levine
- Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC USA
| | - James S. Guy
- Department of Population Health and Pathobiology, North Carolina State University, Raleigh, NC 27607 USA
| | - Hiroyuki Mochizuki
- Department of Molecular Biomedical Sciences, North Carolina State University, Raleigh, NC USA
| | - Matthew Breen
- Department of Molecular Biomedical Sciences, North Carolina State University, Raleigh, NC USA
| | - Coby Schal
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC USA
| | - David W. Watson
- Department of Entomology and Plant Pathology, North Carolina State University, Raleigh, NC USA
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55
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Richard V, Cao-Lormeau VM. Mosquito vectors of arboviruses in French Polynesia. New Microbes New Infect 2019; 31:100569. [PMID: 31316821 PMCID: PMC6611972 DOI: 10.1016/j.nmni.2019.100569] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 02/20/2019] [Accepted: 03/15/2019] [Indexed: 12/15/2022] Open
Abstract
The circulation of arthropod-borne viruses (arboviruses) throughout the Pacific is no exception in French Polynesia (FP). We review here the mosquito vectors involved or potentially involved in the transmission of arboviruses in FP. We highlight Aedes aegypti and Aedes polynesiensis; species that are widely distributed in FP and whose ability to transmit dengue, zika and chikungunya viruses is well known. In addition, we discuss the contribution of those species and the abundant Culex annulirostris to the silent circulation of Ross River virus in FP. As these mosquito species and others present in FP are known to be vectors of a large panel of arboviruses, there is a high risk for new emergences.
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Affiliation(s)
- V. Richard
- Institut Louis Malardé, Papeete, Tahiti, French Polynesia
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56
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Jewell NP, Dufault S, Cutcher Z, Simmons CP, Anders KL. Analysis of cluster-randomized test-negative designs: cluster-level methods. Biostatistics 2019; 20:332-346. [PMID: 29447357 DOI: 10.1093/biostatistics/kxy005] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 01/13/2018] [Indexed: 12/24/2022] Open
Abstract
Intervention trials of vector control methods often require community level randomization with appropriate inferential methods. For many interventions, the possibility of confounding due to the effects of health-care seeking behavior on disease ascertainment remains a concern. The test-negative design, a variant of the case-control method, was introduced to mitigate this issue in the assessment of the efficacy of influenza vaccination (measured at an individual level) on influenza infection. Here, we introduce a cluster-randomized test-negative design that includes randomization of the intervention at a group level. We propose several methods for estimation and inference regarding the relative risk (RR). The inferential methods considered are based on the randomization distribution induced by permuting intervention assignment across two sets of randomly selected clusters. The motivating example is a current study of the efficacy of randomized releases of Wolbachia-infected Aedes aegypti mosquitoes to reduce the incidence of dengue in Yogyakarta City, Indonesia. Estimation and inference techniques are assessed through a simulation study.
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Affiliation(s)
- Nicholas P Jewell
- Division of Biostatistics, School of Public Health, University of California, Berkeley, CA 94720, USA
| | - Suzanne Dufault
- Division of Biostatistics, School of Public Health, University of California, Berkeley, CA 94720, USA
| | - Zoe Cutcher
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Level 1, 12 Innovation Walk, Clayton, Victoria 3800, Australia
| | - Cameron P Simmons
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Level 1, 12 Innovation Walk, Clayton, Victoria 3800, Australia
| | - Katherine L Anders
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Level 1, 12 Innovation Walk, Clayton, Victoria 3800, Australia
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57
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Jácome R, Carrasco-Hernández R, Campillo-Balderas JA, López-Vidal Y, Lazcano A, Wenzel RP, Ponce de León S. A yellow flag on the horizon: The looming threat of yellow fever to North America. Int J Infect Dis 2019; 87:143-150. [PMID: 31382047 DOI: 10.1016/j.ijid.2019.07.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2019] [Revised: 07/26/2019] [Accepted: 07/26/2019] [Indexed: 01/12/2023] Open
Abstract
OBJECTIVES Yellow fever virus historically was a frequent threat to American and European coasts. Medical milestones such as the discovery of mosquitoes as vectors and subsequently an effective vaccine significantly reduced its incidence, in spite of which, thousands of cases of this deathly disease still occur regularly in Sub-Saharan Africa and the Amazonian basin in South America, which are usually not reported. An urban outbreak in Angola, consecutive years of increasing incidence near major Brazilian cities, and imported cases in China, South America and Europe, have brought this virus back to the global spotlight. The aim of this article is to underline that the preventive YFV measures, such as vaccination, need to be carefully revised in order to minimize the risks of new YFV outbreaks, especially in urban or immunologically vulnerable places. Furthermore, this article highlights the diverse factors that have favored the spread of other Aedes spp.-associated arboviral diseases like Dengue, Chikungunya and Zika, to northern latitudes causing epidemics in the United States and Europe, emphasizing the possibility that YFV might follow the path of these viruses unless enhanced surveillance and efficient control systems are urgently initiated.
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Affiliation(s)
- Rodrigo Jácome
- Laboratorio de Origen de la Vida, Facultad de Ciencias, Universidad Nacional Autónoma de México, Av. Universidad 3000, C.P. 04510, Mexico City, Mexico
| | - R Carrasco-Hernández
- División de Investigación, Facultad de Medicina, Universidad Nacional Autónoma de México, Av. Universidad 3000, C.P. 04510, Mexico City, Mexico
| | - José Alberto Campillo-Balderas
- Laboratorio de Origen de la Vida, Facultad de Ciencias, Universidad Nacional Autónoma de México, Av. Universidad 3000, C.P. 04510, Mexico City, Mexico
| | - Yolanda López-Vidal
- Programa de Inmunología Molecular Microbiana, Facultad de Medicina, Universidad Nacional Autónoma de México, Av. Universidad 3000, C.P. 04510, Mexico City, Mexico
| | - Antonio Lazcano
- Laboratorio de Origen de la Vida, Facultad de Ciencias, Universidad Nacional Autónoma de México, Av. Universidad 3000, C.P. 04510, Mexico City, Mexico; Miembro de El Colegio Nacional, Mexico
| | | | - Samuel Ponce de León
- Programa Universitario de Investigación en Salud, Universidad Nacional Autónoma de México, Av. Universidad 3000, C.P. 04510, Mexico City, Mexico.
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58
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Velez ID, Santacruz E, Kutcher SC, Duque SL, Uribe A, Barajas J, Gonzalez S, Patino AC, Zuluaga L, Martínez L, Muñoz E, Mejia MC, Arbelaez MP, Pulido H, Jewell NP, Dufault SM, O'Neill SL, Simmons CP, Anders KL, Tanamas SK. The impact of city-wide deployment of Wolbachia-carrying mosquitoes on arboviral disease incidence in Medellín and Bello, Colombia: study protocol for an interrupted time-series analysis and a test-negative design study. F1000Res 2019; 8:1327. [PMID: 34900237 PMCID: PMC8637243 DOI: 10.12688/f1000research.19858.1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 07/22/2019] [Indexed: 08/23/2023] Open
Abstract
Background: Dengue, chikungunya and Zika are viral infections transmitted by Aedes aegypti mosquitoes, and present major public health challenges in tropical regions. Traditional vector control methods have been ineffective at halting disease transmission. The World Mosquito Program has developed a novel approach to arbovirus control using Ae. aegypti stably transfected with the Wolbachia bacterium, which have significantly reduced ability to transmit dengue, Zika and chikungunya in laboratory experiments. Field releases in eight countries have demonstrated Wolbachia establishment in local Ae. aegypti populations. Methods: We describe a pragmatic approach to measuring the epidemiological impact of city-wide Wolbachia deployments in Bello and Medellín, Colombia. First, an interrupted time-series analysis will compare the incidence of dengue, chikungunya and Zika case notifications before and after Wolbachia releases, across the two municipalities. Second, a prospective case-control study using a test-negative design will be conducted in one quadrant of Medellín. Three of the six contiguous release zones in the case-control area were allocated to receive the first Wolbachia deployments in the city and three to be treated last, approximating a parallel two-arm trial for the >12-month period during which Wolbachia exposure remains discordant. Allocation, although non-random, aimed to maximise balance between arms in historical dengue incidence and demographics. Arboviral disease cases and arbovirus-negative controls will be enrolled concurrently from febrile patients presenting to primary care, with case/control status classified retrospectively following laboratory diagnostic testing. Intervention effect is estimated from an aggregate odds ratio comparing Wolbachia-exposure odds among test-positive cases versus test-negative controls. Discussion: The study findings will add to an accumulating body of evidence from global field sites on the efficacy of the Wolbachia method in reducing arboviral disease incidence, and can inform decisions on wider public health implementation of this intervention in the Americas and beyond. Trial registration: ClinicalTrials.gov: NCT03631719. Registered on 15 August 2018.
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Affiliation(s)
- Ivan D. Velez
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Eduardo Santacruz
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Simon C. Kutcher
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, VIC, Australia
| | - Sandra L. Duque
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Alexander Uribe
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Jovany Barajas
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Sandra Gonzalez
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | | | - Lina Zuluaga
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Luis Martínez
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Estefanía Muñoz
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | | | | | | | - Nicholas P. Jewell
- Division of Epidemiology and Biostatistics, School of Public Health, University of California, Berkeley, Berkeley, CA, USA
- Centre for Statistical Methodology, London School of Hygiene & Tropical Medicine, London, UK
| | - Suzanne M Dufault
- Division of Epidemiology and Biostatistics, School of Public Health, University of California, Berkeley, Berkeley, CA, USA
| | - Scott L. O'Neill
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, VIC, Australia
| | - Cameron P. Simmons
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, VIC, Australia
| | - Katherine L. Anders
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, VIC, Australia
| | - Stephanie K. Tanamas
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, VIC, Australia
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59
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Velez ID, Santacruz E, Kutcher SC, Duque SL, Uribe A, Barajas J, Gonzalez S, Patino AC, Zuluaga L, Martínez L, Muñoz E, Mejia MC, Arbelaez MP, Pulido H, Jewell NP, Dufault SM, O'Neill SL, Simmons CP, Anders KL, Tanamas SK. The impact of city-wide deployment of Wolbachia-carrying mosquitoes on arboviral disease incidence in Medellín and Bello, Colombia: study protocol for an interrupted time-series analysis and a test-negative design study. F1000Res 2019; 8:1327. [PMID: 34900237 PMCID: PMC8637243 DOI: 10.12688/f1000research.19858.2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/13/2020] [Indexed: 12/20/2022] Open
Abstract
Background: Dengue, chikungunya and Zika are viral infections transmitted by Aedes aegypti mosquitoes, and present major public health challenges in tropical regions. Traditional vector control methods have been ineffective at halting disease transmission. The World Mosquito Program has developed a novel approach to arbovirus control using Ae. aegypti stably transfected with the Wolbachia bacterium, which have significantly reduced ability to transmit dengue, Zika and chikungunya in laboratory experiments. Field releases in eight countries have demonstrated Wolbachia establishment in local Ae. aegypti populations. Methods: We describe a pragmatic approach to measuring the epidemiological impact of city-wide Wolbachia deployments in Bello and Medellín, Colombia. First, an interrupted time-series analysis will compare the incidence of dengue, chikungunya and Zika case notifications before and after Wolbachia releases, across the two municipalities. Second, a prospective case-control study using a test-negative design will be conducted in one quadrant of Medellín. Three of the six contiguous release zones in the case-control area were allocated to receive the first Wolbachia deployments in the city and three to be treated last, approximating a parallel two-arm trial for the >12-month period during which Wolbachia exposure remains discordant. Allocation, although non-random, aimed to maximise balance between arms in historical dengue incidence and demographics. Arboviral disease cases and arbovirus-negative controls will be enrolled concurrently from febrile patients presenting to primary care, with case/control status classified retrospectively following laboratory diagnostic testing. Intervention effect is estimated from an aggregate odds ratio comparing Wolbachia-exposure odds among test-positive cases versus test-negative controls. Discussion: The study findings will add to an accumulating body of evidence from global field sites on the efficacy of the Wolbachia method in reducing arboviral disease incidence, and can inform decisions on wider public health implementation of this intervention in the Americas and beyond. Trial registration: ClinicalTrials.gov: NCT03631719. Registered on 15 August 2018.
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Affiliation(s)
- Ivan D. Velez
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Eduardo Santacruz
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Simon C. Kutcher
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, VIC, Australia
| | - Sandra L. Duque
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Alexander Uribe
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Jovany Barajas
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Sandra Gonzalez
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | | | - Lina Zuluaga
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Luis Martínez
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | - Estefanía Muñoz
- World Mosquito Program, Universidad de Antioquia, Medellin, Colombia
| | | | | | | | - Nicholas P. Jewell
- Division of Epidemiology and Biostatistics, School of Public Health, University of California, Berkeley, Berkeley, CA, USA
- Centre for Statistical Methodology, London School of Hygiene & Tropical Medicine, London, UK
| | - Suzanne M Dufault
- Division of Epidemiology and Biostatistics, School of Public Health, University of California, Berkeley, Berkeley, CA, USA
| | - Scott L. O'Neill
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, VIC, Australia
| | - Cameron P. Simmons
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, VIC, Australia
| | - Katherine L. Anders
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, VIC, Australia
| | - Stephanie K. Tanamas
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, VIC, Australia
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60
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Schneider DI, Saarman N, Onyango MG, Hyseni C, Opiro R, Echodu R, O’Neill M, Bloch D, Vigneron A, Johnson TJ, Dion K, Weiss BL, Opiyo E, Caccone A, Aksoy S. Spatio-temporal distribution of Spiroplasma infections in the tsetse fly (Glossina fuscipes fuscipes) in northern Uganda. PLoS Negl Trop Dis 2019; 13:e0007340. [PMID: 31369548 PMCID: PMC6692048 DOI: 10.1371/journal.pntd.0007340] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2019] [Revised: 08/13/2019] [Accepted: 07/13/2019] [Indexed: 12/13/2022] Open
Abstract
Tsetse flies (Glossina spp.) are vectors of parasitic trypanosomes, which cause human (HAT) and animal African trypanosomiasis (AAT) in sub-Saharan Africa. In Uganda, Glossina fuscipes fuscipes (Gff) is the main vector of HAT, where it transmits Gambiense disease in the northwest and Rhodesiense disease in central, southeast and western regions. Endosymbionts can influence transmission efficiency of parasites through their insect vectors via conferring a protective effect against the parasite. It is known that the bacterium Spiroplasma is capable of protecting its Drosophila host from infection with a parasitic nematode. This endosymbiont can also impact its host's population structure via altering host reproductive traits. Here, we used field collections across 26 different Gff sampling sites in northern and western Uganda to investigate the association of Spiroplasma with geographic origin, seasonal conditions, Gff genetic background and sex, and trypanosome infection status. We also investigated the influence of Spiroplasma on Gff vector competence to trypanosome infections under laboratory conditions. Generalized linear models (GLM) showed that Spiroplasma probability was correlated with the geographic origin of Gff host and with the season of collection, with higher prevalence found in flies within the Albert Nile (0.42 vs 0.16) and Achwa River (0.36 vs 0.08) watersheds and with higher prevalence detected in flies collected in the intermediate than wet season. In contrast, there was no significant correlation of Spiroplasma prevalence with Gff host genetic background or sex once geographic origin was accounted for in generalized linear models. Additionally, we found a potential negative correlation of Spiroplasma with trypanosome infection, with only 2% of Spiroplasma infected flies harboring trypanosome co-infections. We also found that in a laboratory line of Gff, parasitic trypanosomes are less likely to colonize the midgut in individuals that harbor Spiroplasma infection. These results indicate that Spiroplasma infections in tsetse may be maintained by not only maternal but also via horizontal transmission routes, and Spiroplasma infections may also have important effects on trypanosome transmission efficiency of the host tsetse. Potential functional effects of Spiroplasma infection in Gff could have impacts on vector control approaches to reduce trypanosome infections.
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Affiliation(s)
- Daniela I. Schneider
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT, United States of America
- * E-mail:
| | - Norah Saarman
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, United States of America
| | - Maria G. Onyango
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT, United States of America
| | - Chaz Hyseni
- Department of Biology, University of Mississippi, University, MS, United States of America
| | - Robert Opiro
- Department of Biology, Faculty of Science, Gulu University, Uganda
| | - Richard Echodu
- Department of Biology, Faculty of Science, Gulu University, Uganda
| | - Michelle O’Neill
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT, United States of America
| | - Danielle Bloch
- Department of Health and Mental Hygiene, New York City, NY, United States of America
| | - Aurélien Vigneron
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT, United States of America
| | - T. J. Johnson
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, United States of America
| | - Kirstin Dion
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, United States of America
| | - Brian L. Weiss
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT, United States of America
| | - Elizabeth Opiyo
- Department of Biology, University of Mississippi, University, MS, United States of America
| | - Adalgisa Caccone
- Department of Ecology and Evolutionary Biology, Yale University, New Haven, CT, United States of America
| | - Serap Aksoy
- Department of Epidemiology of Microbial Diseases, Yale School of Public Health, New Haven, CT, United States of America
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61
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Koh C, Audsley MD, Di Giallonardo F, Kerton EJ, Young PR, Holmes EC, McGraw EA. Sustained Wolbachia-mediated blocking of dengue virus isolates following serial passage in Aedes aegypti cell culture. Virus Evol 2019; 5:vez012. [PMID: 31191980 PMCID: PMC6555872 DOI: 10.1093/ve/vez012] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Wolbachia is an intracellular endosymbiont of insects that inhibits the replication of a range of pathogens in its arthropod hosts. The release of Wolbachia into wild populations of mosquitoes is an innovative biocontrol effort to suppress the transmission of arthropod-borne viruses (arboviruses) to humans, most notably dengue virus. The success of the Wolbachia-based approach hinges upon the stable persistence of the ‘pathogen blocking’ effect, whose mechanistic basis is poorly understood. Evidence suggests that Wolbachia may affect viral replication via a combination of competition for host resources and activation of host immunity. The evolution of resistance against Wolbachia and pathogen blocking in the mosquito or the virus could reduce the public health impact of the symbiont releases. Here, we investigate if dengue 3 virus (DENV-3) is capable of accumulating adaptive mutations that improve its replicative capacity during serial passage in Wolbachia wMel-infected cells. During the passaging regime, viral isolates in Wolbachia-infected cells exhibited greater variation in viral loads compared to controls. The viral loads of these isolates declined rapidly during passaging due to the blocking effects of Wolbachia carriage, with several being lost all together and the remainder recovering to low but stable levels. We attempted to sequence the genomes of the surviving passaged isolates but, given their low abundance, were unable to obtain sufficient depth of coverage for evolutionary analysis. In contrast, viral loads in Wolbachia-free control cells were consistently high during passaging. The surviving isolates passaged in the presence of Wolbachia exhibited a reduced ability to replicate even in Wolbachia-free cells. These experiments demonstrate the challenge for dengue in evolving resistance to Wolbachia-mediated blocking.
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Affiliation(s)
- Cassandra Koh
- School of Biological Sciences, Monash University, Clayton, VIC, Australia
| | - Michelle D Audsley
- School of Biological Sciences, Monash University, Clayton, VIC, Australia
| | - Francesca Di Giallonardo
- Marie Bashir Institute for Infectious Diseases and Biosecurity, Charles Perkins Centre, School of Life and Environmental Sciences, The University of Sydney, Camperdown, NSW, Australia.,Sydney Medical School, The University of Sydney, Camperdown, NSW, Australia.,The Kirby Institute, School of Medical Sciences, University of New South Wales, Sydney, NSW, Australia
| | - Emily J Kerton
- School of Biological Sciences, Monash University, Clayton, VIC, Australia
| | - Paul R Young
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, QLD, Australia
| | - Edward C Holmes
- Marie Bashir Institute for Infectious Diseases and Biosecurity, Charles Perkins Centre, School of Life and Environmental Sciences, The University of Sydney, Camperdown, NSW, Australia
| | - Elizabeth A McGraw
- School of Biological Sciences, Monash University, Clayton, VIC, Australia.,Department of Entomology, Center for Infectious Disease Dynamics, Huck Institutes of the Life Sciences, Pennsylvania State University, State College, PA, USA
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62
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Sigle LT, McGraw EA. Expanding the canon: Non-classical mosquito genes at the interface of arboviral infection. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2019; 109:72-80. [PMID: 30970277 DOI: 10.1016/j.ibmb.2019.04.004] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Revised: 03/10/2019] [Accepted: 04/01/2019] [Indexed: 06/09/2023]
Abstract
Mosquito transmitted viruses cause significant morbidity and mortality in human populations. Despite the use of insecticides and other measures of vector control, arboviral diseases are on the rise. One potential solution for limiting disease transmission to humans is to render mosquitoes refractory to viral infection through genetic modification. Substantial research effort in Drosophila, Aedes and Anopheles has helped to define the major innate immune pathways, including Toll, IMD, Jak/Stat and RNAi, however we still have an incomplete picture of the mosquito antiviral response. Transcriptional profiles of virus-infected insects reveal a much wider range of pathways activated by the process of infection. Within these lists of genes are unexplored mosquito candidates of viral defense. Wolbachia species are endosymbiotic bacteria that naturally limit arboviral infection in mosquitoes. Our understanding of the Wolbachia-mediated viral blocking mechanism is poor, but it does not appear to operate via the classical immune pathways. Herein, we reviewed the transcriptomic response of mosquitoes to multiple viral species and put forth consensus gene types/families outside the immune canon whose expression responds to infection, including cytoskeleton and cellular trafficking, the heat shock response, cytochromes P450, cell proliferation, chitin and small RNAs. We then examine emerging evidence for their functional role in viral resistance in diverse insect and mammalian hosts and their potential role in Wolbachia-mediated viral blocking. These candidate gene families offer novel avenues for research into the nature of insect viral defense.
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Affiliation(s)
- Leah T Sigle
- Center for Infectious Disease Dynamics, Department of Entomology, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 16802, USA.
| | - Elizabeth A McGraw
- Center for Infectious Disease Dynamics, Department of Entomology, Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 16802, USA.
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63
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Monteiro VVS, Navegantes-Lima KC, de Lemos AB, da Silva GL, de Souza Gomes R, Reis JF, Rodrigues Junior LC, da Silva OS, Romão PRT, Monteiro MC. Aedes-Chikungunya Virus Interaction: Key Role of Vector Midguts Microbiota and Its Saliva in the Host Infection. Front Microbiol 2019; 10:492. [PMID: 31024463 PMCID: PMC6467098 DOI: 10.3389/fmicb.2019.00492] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2018] [Accepted: 02/26/2019] [Indexed: 01/02/2023] Open
Abstract
Aedes mosquitoes are important vectors for emerging diseases caused by arboviruses, such as chikungunya (CHIKV). These viruses’ main transmitting species are Aedes aegypti and Ae. albopictus, which are present in tropical and temperate climatic areas all over the globe. Knowledge of vector characteristics is fundamentally important to the understanding of virus transmission. Only female mosquitoes are able to transmit CHIKV to the vertebrate host since they are hematophagous. In addition, mosquito microbiota is fundamentally important to virus infection in the mosquito. Microorganisms are able to modulate viral transmission in the mosquito, such as bacteria of the Wolbachia genus, which are capable of preventing viral infection, or protozoans of the Ascogregarina species, which are capable of facilitating virus transmission between mosquitoes and larvae. The competence of the mosquito is also important in the transmission of the virus to the vertebrate host, since their saliva has several substances with biological effects, such as immunomodulators and anticoagulants, which are able to modulate the host’s response to the virus, interfering in its pathogenicity and virulence. Understanding the Aedes vector-chikungunya interaction is fundamentally important since it can enable the search for new methods of combating the virus’ transmission.
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Affiliation(s)
- Valter Vinícius Silva Monteiro
- Laboratory of Inflammation and Pain, Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Kely Campos Navegantes-Lima
- Graduate Program in Neuroscience and Cellular Biology, Biology Science Institute, Federal University of Pará, Belém, Brazil
| | | | | | - Rafaelli de Souza Gomes
- Graduate Program in Pharmaceutical Science, Health Science Institute, Federal University of Pará, Belém, Brazil
| | - Jordano Ferreira Reis
- School of Pharmacy, Health Science Institute, Federal University of Pará, Belém, Brazil
| | - Luiz Carlos Rodrigues Junior
- Laboratory of Cellular and Molecular Immunology, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Brazil
| | - Onilda Santos da Silva
- Department of Microbiology, Immunology and Parasitology, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Pedro Roosevelt Torres Romão
- Laboratory of Cellular and Molecular Immunology, Federal University of Health Sciences of Porto Alegre, Porto Alegre, Brazil
| | - Marta Chagas Monteiro
- Graduate Program in Neuroscience and Cellular Biology, Biology Science Institute, Federal University of Pará, Belém, Brazil.,Graduate Program in Pharmaceutical Science, Health Science Institute, Federal University of Pará, Belém, Brazil
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64
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Harvey E, Madden D, Polkinghorne A, Holmes EC. Identification of A Novel Picorna-Like Virus, Burpengary Virus, that is Negatively Associated with Chlamydial Disease in the Koala. Viruses 2019; 11:E211. [PMID: 30832350 PMCID: PMC6466430 DOI: 10.3390/v11030211] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 02/28/2019] [Accepted: 03/01/2019] [Indexed: 02/05/2023] Open
Abstract
Koalas (Phascolarctos cinereus) are native Australian marsupials whose populations are in decline from a range of threats. Infectious diseases caused by the bacterium Chlamydia pecorum and other pathogens are of particular concern. We analysed 26 poly-A selected RNA-sequencing libraries from a data set designed to study the immune response of koalas to ocular chlamydial infection. Using virus discovery techniques, we identified the coding-complete genome sequence of a novel picorna-like virus, denoted Burpengary virus, that was most common in south-east Queensland. Notably, abundance measurements of the virus across all 26 libraries revealed an inverse relationship between abundance and ocular disease in koalas, suggesting that the co-infection of Burpengary virus and Chlamydia pecorum is inhibited.
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Affiliation(s)
- Erin Harvey
- Marie Bashir Institute for Infectious Diseases and Biosecurity, Charles Perkins Centre, School of Life and Environmental Sciences and Sydney Medical School, The University of Sydney, Sydney, NSW 2006, Australia.
| | - Danielle Madden
- Animal Research Centre, University of the Sunshine Coast, Sippy Downs, QLD 4556, Australia.
| | - Adam Polkinghorne
- Animal Research Centre, University of the Sunshine Coast, Sippy Downs, QLD 4556, Australia.
| | - Edward C Holmes
- Marie Bashir Institute for Infectious Diseases and Biosecurity, Charles Perkins Centre, School of Life and Environmental Sciences and Sydney Medical School, The University of Sydney, Sydney, NSW 2006, Australia.
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65
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Kariithi HM, Boucias DG, Murungi EK, Meki IK, Demirbaş-Uzel G, van Oers MM, Vreysen MJB, Abd-Alla AMM, Vlak JM. Coevolution of hytrosaviruses and host immune responses. BMC Microbiol 2018; 18:183. [PMID: 30470186 PMCID: PMC6251100 DOI: 10.1186/s12866-018-1296-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Hytrosaviruses (SGHVs; Hytrosaviridae family) are double-stranded DNA (dsDNA) viruses that cause salivary gland hypertrophy (SGH) syndrome in flies. Two structurally and functionally distinct SGHVs are recognized; Glossina pallidipes SGHV (GpSGHV) and Musca domestica SGHV (MdSGHV), that infect the hematophagous tsetse fly and the filth-feeding housefly, respectively. Genome sizes and gene contents of GpSGHV (~ 190 kb; 160-174 genes) and MdSGHV (~ 124 kb; 108 genes) may reflect an evolution with the SGHV-hosts resulting in differences in pathobiology. Whereas GpSGHV can switch from asymptomatic to symptomatic infections in response to certain unknown cues, MdSGHV solely infects symptomatically. Overt SGH characterizes the symptomatic infections of SGHVs, but whereas MdSGHV induces both nuclear and cellular hypertrophy (enlarged non-replicative cells), GpSGHV induces cellular hyperplasia (enlarged replicative cells). Compared to GpSGHV's specificity to Glossina species, MdSGHV infects other sympatric muscids. The MdSGHV-induced total shutdown of oogenesis inhibits its vertical transmission, while the GpSGHV's asymptomatic and symptomatic infections promote vertical and horizontal transmission, respectively. This paper reviews the coevolution of the SGHVs and their hosts (housefly and tsetse fly) based on phylogenetic relatedness of immune gene orthologs/paralogs and compares this with other virus-insect models. RESULTS Whereas MdSGHV is not vertically transmitted, GpSGHV is both vertically and horizontally transmitted, and the balance between the two transmission modes may significantly influence the pathogenesis of tsetse virus. The presence and absence of bacterial symbionts (Wigglesworthia and Sodalis) in tsetse and Wolbachia in the housefly, respectively, potentially contributes to the development of SGH symptoms. Unlike MdSGHV, GpSGHV contains not only host-derived proteins, but also appears to have evolutionarily recruited cellular genes from ancestral host(s) into its genome, which, although may be nonessential for viral replication, potentially contribute to the evasion of host's immune responses. Whereas MdSGHV has evolved strategies to counteract both the housefly's RNAi and apoptotic responses, the housefly has expanded its repertoire of immune effector, modulator and melanization genes compared to the tsetse fly. CONCLUSIONS The ecologies and life-histories of the housefly and tsetse fly may significantly influence coevolution of MdSGHV and GpSGHV with their hosts. Although there are still many unanswered questions regarding the pathogenesis of SGHVs, and the extent to which microbiota influence expression of overt SGH symptoms, SGHVs are attractive 'explorers' to elucidate the immune responses of their hosts, and the transmission modes of other large DNA viruses.
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Affiliation(s)
- Henry M Kariithi
- Biotechnology Research Institute, Kenya Agricultural and Livestock Research Organization, P.O Box 57811, Kaptagat Rd, Loresho, Nairobi, 00200, Kenya. .,Insect Pest Control Laboratory, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Wagrammer Straße 5, A-1400, Vienna, Austria. .,Present Address: US National Poultry Research Centre, Southeast Poultry Research Laboratory, USDA-ARS, 934 College Station Road, Athens, GA, 30605, USA.
| | - Drion G Boucias
- Entomology and Nematology Department, University of Florida, 970 Natural Area Drive, Gainesville, FL, 32611, USA
| | - Edwin K Murungi
- Department of Biochemistry and Molecular Biology, Egerton University, P.O. Box 536, Njoro, 20115, Kenya
| | - Irene K Meki
- Insect Pest Control Laboratory, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Wagrammer Straße 5, A-1400, Vienna, Austria.,Laboratory of Virology, Wageningen University and Research, 6708 PB, Wageningen, The Netherlands
| | - Güler Demirbaş-Uzel
- Insect Pest Control Laboratory, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Wagrammer Straße 5, A-1400, Vienna, Austria
| | - Monique M van Oers
- Laboratory of Virology, Wageningen University and Research, 6708 PB, Wageningen, The Netherlands
| | - Marc J B Vreysen
- Insect Pest Control Laboratory, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Wagrammer Straße 5, A-1400, Vienna, Austria
| | - Adly M M Abd-Alla
- Insect Pest Control Laboratory, Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Wagrammer Straße 5, A-1400, Vienna, Austria
| | - Just M Vlak
- Laboratory of Virology, Wageningen University and Research, 6708 PB, Wageningen, The Netherlands
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66
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Niang EHA, Bassene H, Fenollar F, Mediannikov O. Biological Control of Mosquito-Borne Diseases: The Potential of Wolbachia-Based Interventions in an IVM Framework. J Trop Med 2018; 2018:1470459. [PMID: 30581476 PMCID: PMC6276417 DOI: 10.1155/2018/1470459] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 10/17/2018] [Accepted: 10/23/2018] [Indexed: 12/31/2022] Open
Abstract
People living in the tropical and subtropical regions of the world face an enormous health burden due to mosquito-borne diseases such as malaria, dengue fever, and filariasis. Historically and today, targeting mosquito vectors with, primarily, insecticide-based control strategies have been a key control strategy against major mosquito-borne diseases. However, the success to date of such approaches is under threat from multiple insecticide resistance mechanisms while vector control (VC) options are still limited. The situation therefore requires the development of innovative control measures against major mosquito-borne diseases. Transinfecting mosquitos with symbiotic bacteria that can compete with targeted pathogens or manipulate host biology to reduce their vectorial capacity are a promising and innovative biological control approach. In this review, we discuss the current state of knowledge about the association between mosquitoes and Wolbachia, emphasizing the limitations of different mosquito control strategies and the use of mosquitoes' commensal microbiota as innovative approaches to control mosquito-borne diseases.
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Affiliation(s)
- El Hadji Amadou Niang
- VITROME, Campus International UCAD-IRD, Dakar, Senegal
- Aix-Marseille Univ, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
- Laboratoire d'Ecologie Vectorielle et Parasitaire, Faculté des Sciences et Techniques, Université Cheikh Anta Diop (UCAD) de Dakar, Senegal
| | - Hubert Bassene
- VITROME, Campus International UCAD-IRD, Dakar, Senegal
- Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, IHU-Méditerranée Infection, Marseille, France
| | - Florence Fenollar
- Aix Marseille Univ, IRD, AP-HM, SSA, VITROME, IHU-Méditerranée Infection, Marseille, France
| | - Oleg Mediannikov
- Aix-Marseille Univ, IRD, AP-HM, MEPHI, IHU-Méditerranée Infection, Marseille, France
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67
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Leftwich PT, Edgington MP, Harvey-Samuel T, Carabajal Paladino LZ, Norman VC, Alphey L. Recent advances in threshold-dependent gene drives for mosquitoes. Biochem Soc Trans 2018; 46:1203-1212. [PMID: 30190331 PMCID: PMC6195636 DOI: 10.1042/bst20180076] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 07/17/2018] [Accepted: 07/18/2018] [Indexed: 01/09/2023]
Abstract
Mosquito-borne diseases, such as malaria, dengue and chikungunya, cause morbidity and mortality around the world. Recent advances in gene drives have produced control methods that could theoretically modify all populations of a disease vector, from a single release, making whole species less able to transmit pathogens. This ability has caused both excitement, at the prospect of global eradication of mosquito-borne diseases, and concern around safeguards. Drive mechanisms that require individuals to be released at high frequency before genes will spread can therefore be desirable as they are potentially localised and reversible. These include underdominance-based strategies and use of the reproductive parasite Wolbachia Here, we review recent advances in practical applications and mathematical analyses of these threshold-dependent gene drives with a focus on implementation in Aedes aegypti, highlighting their mechanisms and the role of fitness costs on introduction frequencies. Drawing on the parallels between these systems offers useful insights into practical, controlled application of localised drives, and allows us to assess the requirements needed for gene drive reversal.
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Affiliation(s)
| | | | | | | | | | - Luke Alphey
- The Pirbright Institute, Pirbright, Woking, Surrey, U.K.
- Department of Zoology, University of Oxford, Oxford, U.K
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68
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Aedes Anphevirus: an Insect-Specific Virus Distributed Worldwide in Aedes aegypti Mosquitoes That Has Complex Interplays with Wolbachia and Dengue Virus Infection in Cells. J Virol 2018; 92:JVI.00224-18. [PMID: 29950416 DOI: 10.1128/jvi.00224-18] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Accepted: 05/30/2018] [Indexed: 01/21/2023] Open
Abstract
Insect-specific viruses (ISVs) of the yellow fever mosquito Aedes aegypti have been demonstrated to modulate transmission of arboviruses such as dengue virus (DENV) and West Nile virus by the mosquito. The diversity and composition of the virome of A. aegypti, however, remains poorly understood. In this study, we characterized Aedes anphevirus (AeAV), a negative-sense RNA virus from the order Mononegavirales AeAV identified from Aedes cell lines was infectious to both A. aegypti and Aedes albopictus cells but not to three mammalian cell lines. To understand the incidence and genetic diversity of AeAV, we assembled 17 coding-complete and two partial genomes of AeAV from available transcriptome sequencing (RNA-Seq) data. AeAV appears to transmit vertically and be present in laboratory colonies, wild-caught mosquitoes, and cell lines worldwide. Phylogenetic analysis of AeAV strains indicates that as the A. aegypti mosquito has expanded into the Americas and Asia-Pacific, AeAV has evolved into monophyletic African, American, and Asia-Pacific lineages. The endosymbiotic bacterium Wolbachia pipientis restricts positive-sense RNA viruses in A. aegypti Reanalysis of a small RNA library of A. aegypti cells coinfected with AeAV and Wolbachia produces an abundant RNA interference (RNAi) response consistent with persistent virus replication. We found Wolbachia enhances replication of AeAV compared to a tetracycline-cleared cell line, and AeAV modestly reduces DENV replication in vitro The results from our study improve understanding of the diversity and evolution of the virome of A. aegypti and adds to previous evidence that shows Wolbachia does not restrict a range of negative-strand RNA viruses.IMPORTANCE The mosquito Aedes aegypti transmits a number of arthropod-borne viruses (arboviruses), such as dengue virus and Zika virus. Mosquitoes also harbor insect-specific viruses that may affect replication of pathogenic arboviruses in their body. Currently, however, there are only a few insect-specific viruses described from A. aegypti in the literature. Here, we characterize a novel negative-strand virus, AeAV. Meta-analysis of A. aegypti samples showed that it is present in A. aegypti mosquitoes worldwide and is vertically transmitted. Wolbachia-transinfected mosquitoes are currently being used in biocontrol, as they effectively block transmission of several positive-sense RNA viruses in mosquitoes. Our results demonstrate that Wolbachia enhances the replication of AeAV and modestly reduces dengue virus replication in a cell line model. This study expands our understanding of the virome in A. aegypti as well as providing insight into the complexity of the Wolbachia virus restriction phenotype.
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69
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Monsanto-Hearne V, Johnson KN. Wolbachia-mediated protection of Drosophila melanogaster against systemic infection with its natural viral pathogen Drosophila C virus does not involve changes in levels of highly abundant miRNAs. J Gen Virol 2018; 99:827-831. [DOI: 10.1099/jgv.0.001064] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Affiliation(s)
- Verna Monsanto-Hearne
- School of Biological Sciences, The University of Queensland, Brisbane 4067, Australia
| | - Karyn N. Johnson
- School of Biological Sciences, The University of Queensland, Brisbane 4067, Australia
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70
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Anders KL, Indriani C, Ahmad RA, Tantowijoyo W, Arguni E, Andari B, Jewell NP, Rances E, O'Neill SL, Simmons CP, Utarini A. The AWED trial (Applying Wolbachia to Eliminate Dengue) to assess the efficacy of Wolbachia-infected mosquito deployments to reduce dengue incidence in Yogyakarta, Indonesia: study protocol for a cluster randomised controlled trial. Trials 2018; 19:302. [PMID: 29855331 PMCID: PMC5984439 DOI: 10.1186/s13063-018-2670-z] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 05/03/2018] [Indexed: 11/10/2022] Open
Abstract
Background Dengue and other arboviruses transmitted by Aedes aegypti mosquitoes, including Zika and chikungunya, present an increasing public health challenge in tropical regions. Current vector control strategies have failed to curb disease transmission, but continue to be employed despite the absence of robust evidence for their effectiveness or optimal implementation. The World Mosquito Program has developed a novel approach to arbovirus control using Ae. aegypti stably transfected with Wolbachia bacterium, with a significantly reduced ability to transmit dengue, Zika and chikungunya in laboratory experiments. Modelling predicts this will translate to local elimination of dengue in most epidemiological settings. This study protocol describes the first trial to measure the efficacy of Wolbachia in reducing dengue virus transmission in the field. Methods/design The study is a parallel, two-arm, non-blinded cluster randomised controlled trial conducted in a single site in Yogyakarta, Indonesia. The aim is to determine whether large-scale deployment of Wolbachia-infected Ae. aegypti mosquitoes leads to a measurable reduction in dengue incidence in treated versus untreated areas. The primary endpoint is symptomatic, virologically confirmed dengue virus infection of any severity. The 26 km2 study area was subdivided into 24 contiguous clusters, allocated randomly 1:1 to receive Wolbachia deployments or no intervention. We use a novel epidemiological study design, the cluster-randomised test-negative design trial, in which dengue cases and arbovirus-negative controls are sampled concurrently from among febrile patients presenting to a network of primary care clinics, with case or control status classified retrospectively based on the results of laboratory diagnostic testing. Efficacy is estimated from the odds ratio of Wolbachia exposure distribution (probability of living in a Wolbachia-treated area) among virologically confirmed dengue cases compared to test-negative controls. A secondary per-protocol analysis allows for individual Wolbachia exposure levels to be assessed to account for movements outside the cluster and the heterogeneity in local Wolbachia prevalence among treated clusters. Discussion The findings from this study will provide the first experimental evidence for the efficacy of Wolbachia in reducing dengue incidence. Together with observational evidence that is accumulating from pragmatic deployments of Wolbachia in other field sites, this will provide valuable data to estimate the effectiveness of this novel approach to arbovirus control, inform future cost-effectiveness estimates, and guide plans for large-scale deployments in other endemic settings. Trial registration ClinicalTrials.gov, identifier: NCT03055585. Registered on 14 February 2017. Electronic supplementary material The online version of this article (10.1186/s13063-018-2670-z) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Katherine L Anders
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, Australia.
| | - Citra Indriani
- Department of Biostatistics, Epidemiology and Population Health, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia.,Eliminate Dengue Project, Centre for Tropical Medicine, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Riris Andono Ahmad
- Department of Biostatistics, Epidemiology and Population Health, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia.,Eliminate Dengue Project, Centre for Tropical Medicine, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Warsito Tantowijoyo
- Eliminate Dengue Project, Centre for Tropical Medicine, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Eggi Arguni
- Eliminate Dengue Project, Centre for Tropical Medicine, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia.,Department of Pediatrics, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | - Bekti Andari
- Eliminate Dengue Project, Centre for Tropical Medicine, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
| | | | - Edwige Rances
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, Australia
| | - Scott L O'Neill
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, Australia
| | - Cameron P Simmons
- World Mosquito Program, Institute of Vector Borne Disease, Monash University, Melbourne, Australia
| | - Adi Utarini
- Eliminate Dengue Project, Centre for Tropical Medicine, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia.,Department of Health Policy and Management, Faculty of Medicine, Universitas Gadjah Mada, Yogyakarta, Indonesia
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71
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Variation in Wolbachia effects on Aedes mosquitoes as a determinant of invasiveness and vectorial capacity. Nat Commun 2018; 9:1483. [PMID: 29662096 PMCID: PMC5902584 DOI: 10.1038/s41467-018-03981-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 03/27/2018] [Indexed: 12/26/2022] Open
Abstract
Wolbachia has been introduced into Aedes aegypti mosquitoes to control the spread of arboviruses, such as dengue, chikungunya and Zika. Studies showed that certain Wolbachia strains (such as wMel) reduce replication of dengue viruses in the laboratory, prompting the release of mosquitoes carrying the bacterium into the field, where vectorial capacity can be realistically assessed in relation to native non-carriers. Here we apply a new analysis to two published datasets, and show that wMel increases the mean and the variance in Ae. aegypti susceptibility to dengue infection when introgressed into Brazil and Vietnam genetic backgrounds. In the absence of other processes, higher mean susceptibility should lead to enhanced viral transmission. The increase in variance, however, widens the basis for selection imposed by unexplored natural forces, retaining the potential for reducing transmission overall. Wolbachia infection in mosquitoes reduces dengue virus spread under specific lab conditions, prompting its use in disease control. Here, King et al. show that Wolbachia increases mean and variance in mosquito susceptibility and explain how this affects Wolbachia invasion and dengue transmission.
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Guo Y, Song Z, Luo L, Wang Q, Zhou G, Yang D, Zhong D, Zheng X. Molecular evidence for new sympatric cryptic species of Aedes albopictus (Diptera: Culicidae) in China: A new threat from Aedes albopictus subgroup? Parasit Vectors 2018; 11:228. [PMID: 29618379 PMCID: PMC5885320 DOI: 10.1186/s13071-018-2814-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2017] [Accepted: 03/25/2018] [Indexed: 11/22/2022] Open
Abstract
Background Aedes (Stegomyia) albopictus (Skuse) is an indigenous species and the predominant vector of dengue fever in China. Understanding of genetic diversity and structure of the mosquito would facilitate dengue prevention and vector control. Sympatric cryptic species have been identified in the Ae. albopictus subgroup in Southeast Asia; however, little is known about the presence and distribution of cryptic species in China. This study aimed to examine the genetic diversity, evaluate potential new cryptic sibling species, and assess the prevalence of Wolbachia infections in field populations. Methods Aedes adult female specimens were collected from five provinces in southern and central China during 2015–2016. Morphological identification was performed under dissection microscope. The mitochondrial DNA cytochrome c oxidase subunit 1 (cox1, DNA barcoding) locus and the ribosomal DNA internal transcribed spacer region 2 (ITS2) marker were used to examine the genetic variation, evaluate cryptic sibling species, and population structure in the field populations. Screening for the presence of Wolbachia was performed using multiplex PCR. Results A total of 140 individual specimens with morphological characteristics similar to Ae. albopictus were sequenced for DNA barcoding. Among these, 129 specimens (92.1%) were confirmed and identified as Ae. albopictus. The remaining 11 specimens, from 2 provinces, were identified as 2 distinct sequence groups, which were confirmed by ITS2 marker sequencing, suggesting the existence of potential cryptic species of Ae. albopictus. In Ae. albopictus, we found significant genetic differentiation and population structure between populations collected from different climate zones. Medium to high frequencies of Wolbachia infections were observed in natural Ae. albopictus populations, whereas Wolbachia was infrequent or absent in cryptic species populations. Conclusions Our findings highlight the population differentiation by climate zone and the presence of novel, cryptic Aedes species in China. The low prevalence of Wolbachia infections in cryptic species populations could reflect either a recent invasion of Wolbachia in Ae. albopictus or different host immune responses to this symbiont in the cryptic species. The study provides useful information for vector control and host-symbiont coevolution. Further study is needed to investigate the potential for arbovirus infection and disease transmission in the emerged cryptic species. Electronic supplementary material The online version of this article (10.1186/s13071-018-2814-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yuyan Guo
- Department of Pathogen Biology, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Zhangyao Song
- Department of Pathogen Biology, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Lei Luo
- Department of Disinfection and Pesticide of Center for Disease Control and Prevention of Guangzhou, Guangzhou, Guangdong, China
| | - Qingmin Wang
- Department of Epidemiology and Health Statistics, School of Public Health, Guizhou Medical University, Guiyang, Guizhou, China
| | - Guofa Zhou
- Program in Public Health School of Medicine, University of California, Irvine, California, USA
| | - Dizi Yang
- Department of Pathogen Biology, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Daibin Zhong
- Program in Public Health School of Medicine, University of California, Irvine, California, USA
| | - Xueli Zheng
- Department of Pathogen Biology, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.
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73
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Ahlers LRH, Goodman AG. The Immune Responses of the Animal Hosts of West Nile Virus: A Comparison of Insects, Birds, and Mammals. Front Cell Infect Microbiol 2018; 8:96. [PMID: 29666784 PMCID: PMC5891621 DOI: 10.3389/fcimb.2018.00096] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2018] [Accepted: 03/16/2018] [Indexed: 12/25/2022] Open
Abstract
Vector-borne diseases, including arboviruses, pose a serious threat to public health worldwide. Arboviruses of the flavivirus genus, such as Zika virus (ZIKV), dengue virus, yellow fever virus (YFV), and West Nile virus (WNV), are transmitted to humans from insect vectors and can cause serious disease. In 2017, over 2,000 reported cases of WNV virus infection occurred in the United States, with two-thirds of cases classified as neuroinvasive. WNV transmission cycles through two different animal populations: birds and mosquitoes. Mammals, particularly humans and horses, can become infected through mosquito bites and represent dead-end hosts of WNV infection. Because WNV can infect diverse species, research on this arbovirus has investigated the host response in mosquitoes, birds, humans, and horses. With the growing geographical range of the WNV mosquito vector and increased human exposure, improved surveillance and treatment of the infection will enhance public health in areas where WNV is endemic. In this review, we survey the bionomics of mosquito species involved in Nearctic WNV transmission. Subsequently, we describe the known immune response pathways that counter WNV infection in insects, birds, and mammals, as well as the mechanisms known to curb viral infection. Moreover, we discuss the bacterium Wolbachia and its involvement in reducing flavivirus titer in insects. Finally, we highlight the similarities of the known immune pathways and identify potential targets for future studies aimed at improving antiviral therapeutic and vaccination design.
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Affiliation(s)
- Laura R H Ahlers
- School of Molecular Biosciences, Washington State University, Pullman, WA, United States
| | - Alan G Goodman
- School of Molecular Biosciences, Washington State University, Pullman, WA, United States.,Paul G. Allen School for Global Animal Health, College of Veterinary Medicine, Washington State University, Pullman, WA, United States
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74
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Insect Transmission of Plant Pathogens: a Systems Biology Perspective. mSystems 2018; 3:mSystems00168-17. [PMID: 29629417 PMCID: PMC5881024 DOI: 10.1128/msystems.00168-17] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Accepted: 01/02/2018] [Indexed: 11/20/2022] Open
Abstract
Insect-vectored pathogens pose one of the greatest threats to plant and animal, including human, health on a global scale. Few effective control strategies have been developed to thwart the transmission of any insect-transmitted pathogen. Most have negative impacts on the environment and human health and are unsustainable. Plant pathogen transmission by insect vectors involves a combination of coevolving biological players: plant hosts, insect vectors, plant pathogens, and bacterial endosymbionts harbored by the insect. Our ability to help growers to control vector-borne disease depends on our ability to generate pathogen- and/or disease-resistant crops by traditional or synthetic approaches and to block pathogen transmission by the insect vector. Systems biology studies have led to the reexamination of existing paradigms on how pathogens interact with insect vectors, including the bacterial symbionts, and have identified vector-pathogen interactions at the molecular and cellular levels for the development of novel transmission interdiction strategies.
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75
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76
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The potential role of Wolbachia in controlling the transmission of emerging human arboviral infections. Curr Opin Infect Dis 2018; 30:108-116. [PMID: 27849636 PMCID: PMC5325245 DOI: 10.1097/qco.0000000000000342] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Purpose of review Wolbachia is a genus of Gram-negative intracellular bacteria that is naturally found in more than half of all arthropod species. These bacteria cannot only reduce the fitness and the reproductive capacities of arthropod vectors, but also increase their resistance to arthropod-borne viruses (arboviruses). This article reviews the evidence supporting a Wolbachia-based strategy for controlling the transmission of dengue and other arboviral infections. Recent findings Studies conducted 1 year after the field release of Wolbachia-infected mosquitoes in Australia have demonstrated the suppression of dengue virus (DENV) replication in and dissemination by mosquitoes. Recent mathematical models show that this strategy could reduce the transmission of DENV by 70%. Consequently, the WHO is encouraging countries to boost the development and implementation of Wolbachia-based prevention strategies against other arboviral infections. However, the evidence regarding the efficacy of Wolbachia to prevent the transmission of other arboviral infections is still limited to an experimental framework with conflicting results in some cases. There is a need to demonstrate the efficacy of such strategies in the field under various climatic conditions, to select the Wolbachia strain that has the best pathogen interference/spread trade-off, and to continue to build community acceptance. Summary Wolbachia represents a promising tool for controlling the transmission of arboviral infections that needs to be developed further. Long-term environmental monitoring will be necessary for timely detection of potential changes in Wolbachia/vector/virus interactions.
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77
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Mosquitoes as Arbovirus Vectors: From Species Identification to Vector Competence. PARASITOLOGY RESEARCH MONOGRAPHS 2018. [PMCID: PMC7122353 DOI: 10.1007/978-3-319-94075-5_9] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Mosquitoes and other arthropods transmit a large number of medically important pathogens, in particular viruses. These arthropod-borne viruses (arboviruses) include a wide variety of RNA viruses belonging to the Flaviviridae family (West Nile virus (WNV), Usutu virus (USUV), Dengue virus (DENV), Japanese encephalitis virus (JEV), Zika virus (ZIKV)), the Togaviridae family (Chikungunya virus (CHIKV)), and Bunyavirales order (Rift Valley fever virus (RVFV)) (please refer also to Table 9.1). Arboviral transmission to humans and livestock constitutes a major threat to public health and economy as illustrated by the emergence of ZIKV in the Americas, RVFV outbreaks in Africa, and the worldwide outbreaks of DENV. To answer the question if those viral pathogens also pose a risk to Europe, we need to first answer the key questions (summarized in Fig. 9.1):Who could contribute to such an outbreak? Information about mosquito species resident or imported, potential hosts and viruses able to infect vectors and hosts in Germany is needed. Where would competent mosquito species meet favorable conditions for transmission? Information on the minimum requirements for efficient replication of the virus in a given vector species and subsequent transmission is needed. How do viruses and vectors interact to facilitate transmission? Information on the vector immunity, vector physiology, vector genetics, and vector microbiomes is needed.
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78
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Terradas G, Allen SL, Chenoweth SF, McGraw EA. Family level variation in Wolbachia-mediated dengue virus blocking in Aedes aegypti. Parasit Vectors 2017; 10:622. [PMID: 29282144 PMCID: PMC5746003 DOI: 10.1186/s13071-017-2589-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 12/12/2017] [Indexed: 12/18/2022] Open
Abstract
BACKGROUND The mosquito vector Aedes aegypti is responsible for transmitting a range of arboviruses including dengue (DENV) and Zika (ZIKV). The global reach of these viruses is increasing due to an expansion of the mosquito's geographic range and increasing urbanization and human travel. Vector control remains the primary means for limiting these diseases. Wolbachia pipientis is an endosymbiotic bacterium of insects that has the ability to block the replication of pathogens, including flaviviruses such as DENV or ZIKV, inside the body of the vector. A strain of Wolbachia called wMel is currently being released into wild mosquito populations to test its potential to limit virus transmission to humans. The mechanism that underpins the virus blocking effect, however, remains elusive. METHODS We used a modified full-sib breeding design in conjunction with vector competence assays in wildtype and wMel-infected Aedes aegypti collected from the field. All individuals were injected with DENV-2 intrathoracically at 5-6 days of age. Tissues were dissected 7 days post-infection to allow quantification of DENV and Wolbachia loads. RESULTS We show the first evidence of family level variation in Wolbachia-mediated blocking in mosquitoes. This variation may stem from either genetic contributions from the mosquito and Wolbachia genomes or environmental influences on Wolbachia. In these families, we also tested for correlations between strength of blocking and expression level for several insect immunity genes with possible roles in blocking, identifying two genes of interest (AGO2 and SCP-2). CONCLUSIONS In this study we show variation in Wolbachia-mediated DENV blocking in Aedes aegypti that may arise from genetic contributions and environmental influences on the mosquito-Wolbachia association. This suggests that Wolbachia-mediated blocking may have the ability to evolve through time or be expressed differentially across environments. The long-term efficacy of Wolbachia in the field will be dependent on the stability of blocking. Understanding the mechanism of blocking will be necessary for successful development of strategies that counter the emergence of evolved resistance or variation in its expression under diverse field conditions.
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Affiliation(s)
- Gerard Terradas
- School of Biological Sciences, Monash University, Clayton, Melbourne, VIC, Australia
| | - Scott L Allen
- School of Biological Sciences, The University of Queensland, QLD, St. Lucia, Australia
| | - Stephen F Chenoweth
- School of Biological Sciences, The University of Queensland, QLD, St. Lucia, Australia
| | - Elizabeth A McGraw
- School of Biological Sciences, Monash University, Clayton, Melbourne, VIC, Australia.
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79
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Vogels CB, Göertz GP, Pijlman GP, Koenraadt CJ. Vector competence of European mosquitoes for West Nile virus. Emerg Microbes Infect 2017; 6:e96. [PMID: 29116220 PMCID: PMC5717085 DOI: 10.1038/emi.2017.82] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Revised: 08/23/2017] [Accepted: 08/27/2017] [Indexed: 01/02/2023]
Abstract
West Nile virus (WNV) is an arthropod-borne flavivirus of high medical and veterinary importance. The main vectors for WNV are mosquito species of the Culex genus that transmit WNV among birds, and occasionally to humans and horses, which are ‘dead-end’ hosts. Recently, several studies have been published that aimed to identify the mosquito species that serve as vectors for WNV in Europe. These studies provide insight in factors that can influence vector competence of European mosquito species for WNV. Here, we review the current knowledge on vector competence of European mosquitoes for WNV, and the molecular knowledge on physical barriers, anti-viral pathways and microbes that influence vector competence based on studies with other flaviviruses. By comparing the 12 available WNV vector competence studies with European mosquitoes we evaluate the effect of factors such as temperature, mosquito origin and mosquito biotype on vector competence. In addition, we propose a standardised methodology to allow for comparative studies across Europe. Finally, we identify knowledge gaps regarding vector competence that, once addressed, will provide important insights into WNV transmission and ultimately contribute to effective strategies to control WNV.
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Affiliation(s)
- Chantal Bf Vogels
- Laboratory of Entomology, Wageningen University & Research, P.O. Box 16, 6700 AA, Wageningen, The Netherlands
| | - Giel P Göertz
- Laboratory of Virology, Wageningen University & Research, P.O. Box 16, 6700 AA, Wageningen, The Netherlands
| | - Gorben P Pijlman
- Laboratory of Virology, Wageningen University & Research, P.O. Box 16, 6700 AA, Wageningen, The Netherlands
| | - Constantianus Jm Koenraadt
- Laboratory of Entomology, Wageningen University & Research, P.O. Box 16, 6700 AA, Wageningen, The Netherlands
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80
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Saucereau Y, Valiente Moro C, Dieryckx C, Dupuy JW, Tran FH, Girard V, Potier P, Mavingui P. Comprehensive proteome profiling in Aedes albopictus to decipher Wolbachia-arbovirus interference phenomenon. BMC Genomics 2017; 18:635. [PMID: 28821226 PMCID: PMC5563009 DOI: 10.1186/s12864-017-3985-y] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Accepted: 08/01/2017] [Indexed: 12/21/2022] Open
Abstract
Background Aedes albopictus is a vector of arboviruses that cause severe diseases in humans such as Chikungunya, Dengue and Zika fevers. The vector competence of Ae. albopictus varies depending on the mosquito population involved and the virus transmitted. Wolbachia infection status in believed to be among key elements that determine viral transmission efficiency. Little is known about the cellular functions mobilized in Ae. albopictus during co-infection by Wolbachia and a given arbovirus. To decipher this tripartite interaction at the molecular level, we performed a proteome analysis in Ae. albopictus C6/36 cells mono-infected by Wolbachia wAlbB strain or Chikungunya virus (CHIKV), and bi-infected. Results We first confirmed significant inhibition of CHIKV by Wolbachia. Using two-dimensional gel electrophoresis followed by nano liquid chromatography coupled with tandem mass spectrometry, we identified 600 unique differentially expressed proteins mostly related to glycolysis, translation and protein metabolism. Wolbachia infection had greater impact on cellular functions than CHIKV infection, inducing either up or down-regulation of proteins associated with metabolic processes such as glycolysis and ATP metabolism, or structural glycoproteins and capsid proteins in the case of bi-infection with CHIKV. CHIKV infection inhibited expression of proteins linked with the processes of transcription, translation, lipid storage and miRNA pathways. Conclusions The results of our proteome profiling have provided new insights into the molecular pathways involved in tripartite Ae. albopictus-Wolbachia-CHIKV interaction and may help defining targets for the better implementation of Wolbachia-based strategies for disease transmission control. Electronic supplementary material The online version of this article (doi:10.1186/s12864-017-3985-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yoann Saucereau
- Université de Lyon, Lyon, France.,Université Lyon 1, Villeurbanne, France.,CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France.,INRA, UMR1418, Villeurbanne, France
| | - Claire Valiente Moro
- Université de Lyon, Lyon, France.,Université Lyon 1, Villeurbanne, France.,CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France.,INRA, UMR1418, Villeurbanne, France
| | - Cindy Dieryckx
- Laboratoire Mixte UMR 5240, Plateforme de Protéomique, CNRS, Lyon, France
| | - Jean-William Dupuy
- Centre de Génomique Fonctionnelle, Plateforme Protéome, Université Bordeaux, F-33000, Bordeaux, France
| | - Florence-Hélène Tran
- Université de Lyon, Lyon, France.,Université Lyon 1, Villeurbanne, France.,CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France.,INRA, UMR1418, Villeurbanne, France
| | - Vincent Girard
- Laboratoire Mixte UMR 5240, Plateforme de Protéomique, CNRS, Lyon, France
| | - Patrick Potier
- Université de Lyon, Lyon, France.,Université Lyon 1, Villeurbanne, France.,CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France.,INRA, UMR1418, Villeurbanne, France
| | - Patrick Mavingui
- Université de Lyon, Lyon, France. .,Université Lyon 1, Villeurbanne, France. .,CNRS, UMR5557, Ecologie Microbienne, Villeurbanne, France. .,INRA, UMR1418, Villeurbanne, France. .,CNRS 9192, INSERM U1187, IRD 249, Unité Mixte Processus Infectieux en Milieu Insulaire Tropical (PIMIT). Plateforme Technologique CYROI, Université de La Réunion, 2 rue Maxime Rivière, 97490, Sainte Clotilde, île de La Réunion, France.
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81
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Terradas G, McGraw EA. Wolbachia-mediated virus blocking in the mosquito vector Aedes aegypti. CURRENT OPINION IN INSECT SCIENCE 2017; 22:37-44. [PMID: 28805637 DOI: 10.1016/j.cois.2017.05.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 05/01/2017] [Indexed: 06/07/2023]
Abstract
Viruses transmitted by mosquitoes such as dengue, Zika and West Nile cause a threat to global health due to increased geographical range and frequency of outbreaks. The bacterium Wolbachia pipientis may be the solution reducing disease transmission. Though commonly missing in vector species, the bacterium was artificially and stably introduced into Aedes aegypti to assess its potential for biocontrol. When infected with Wolbachia, mosquitoes become refractory to infection by a range of pathogens, including the aforementioned viruses. How the bacterium is conferring this phenotype remains unknown. Here we discuss current hypotheses in the field for the mechanistic basis of pathogen blocking and evaluate the evidence from mosquitoes and related insects.
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Affiliation(s)
- Gerard Terradas
- School of Biological Sciences, Monash University, Clayton VIC 3800, Melbourne, Australia
| | - Elizabeth A McGraw
- School of Biological Sciences, Monash University, Clayton VIC 3800, Melbourne, Australia.
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82
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Baldridge G, Higgins L, Witthuhn B, Markowski T, Baldridge A, Armien A, Fallon A. Proteomic analysis of a mosquito host cell response to persistent Wolbachia infection. Res Microbiol 2017; 168:609-625. [PMID: 28435138 DOI: 10.1016/j.resmic.2017.04.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Revised: 03/14/2017] [Accepted: 04/09/2017] [Indexed: 12/14/2022]
Abstract
Wolbachia pipientis, an obligate intracellular bacterium associated with arthropods and filarial worms, is a target for filarial disease treatment and provides a gene drive agent for insect vector population suppression/replacement. We compared proteomes of Aedes albopictus mosquito C/wStr1 cells persistently infected with Wolbachia strain wStr, relative to uninfected C7-10 control cells. Among approximately 2500 proteins, iTRAQ data identified 815 differentially abundant proteins. As functional classes, energy and central intermediary metabolism proteins were elevated in infected cells, while suppressed proteins with roles in host DNA replication, transcription and translation suggested that Wolbachia suppresses pathways that support host cell growth and proliferation. Vacuolar ATPase subunits were strongly elevated, consistent with high densities of Wolbachia contained individually within vacuoles. Other differential level proteins had roles in ROS neutralization, protein modification/degradation and signaling, including hypothetical proteins whose functions in Wolbachia infection can potentially be manipulated by RNAi interference or transfection. Detection of flavivirus proteins supports further analysis of poorly understood, insect-specific flaviviruses and their potential interactions with Wolbachia, particularly in mosquitoes transinfected with Wolbachia. This study provides a framework for future attempts to manipulate pathways in insect cell lines that favor production of Wolbachia for eventual genetic manipulation, transformation and transinfection of vector species.
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Affiliation(s)
- Gerald Baldridge
- Department of Entomology, University of Minnesota, 1980 Folwell Ave., St. Paul, MN 55108, USA.
| | - LeeAnn Higgins
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church St. SE, Minneapolis, MN 55455, USA.
| | - Bruce Witthuhn
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church St. SE, Minneapolis, MN 55455, USA.
| | - Todd Markowski
- Department of Biochemistry, Molecular Biology and Biophysics, University of Minnesota, 6-155 Jackson Hall, 321 Church St. SE, Minneapolis, MN 55455, USA.
| | - Abigail Baldridge
- Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, 680 N. Lake Shore Drive, Chicago, IL 60611, USA.
| | - Anibal Armien
- Department of Veterinary Population Medicine, University of Minnesota, 1333 Gortner Ave., St. Paul, MN 55108, USA.
| | - Ann Fallon
- Department of Entomology, University of Minnesota, 1980 Folwell Ave., St. Paul, MN 55108, USA.
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83
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Novakova E, Woodhams DC, Rodríguez-Ruano SM, Brucker RM, Leff JW, Maharaj A, Amir A, Knight R, Scott J. Mosquito Microbiome Dynamics, a Background for Prevalence and Seasonality of West Nile Virus. Front Microbiol 2017; 8:526. [PMID: 28421042 PMCID: PMC5378795 DOI: 10.3389/fmicb.2017.00526] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 03/13/2017] [Indexed: 11/13/2022] Open
Abstract
Symbiotic microbial communities augment host phenotype, including defense against pathogen carriage and infection. We sampled the microbial communities in 11 adult mosquito host species from six regions in southern Ontario, Canada over 3 years. Of the factors examined, we found that mosquito species was the largest driver of the microbiota, with remarkable phylosymbiosis between host and microbiota. Seasonal shifts of the microbiome were consistently repeated over the 3-year period, while region had little impact. Both host species and seasonal shifts in microbiota were associated with patterns of West Nile virus (WNV) in these mosquitoes. The highest prevalence of WNV, with a seasonal spike each year in August, was in the Culex pipiens/restuans complex, and high WNV prevalence followed a decrease in relative abundance of Wolbachia in this species. Indeed, mean temperature, but not precipitation, was significantly correlated with Wolbachia abundance. This suggests that at higher temperatures Wolbachia abundance is reduced leading to greater susceptibility to WNV in the subsequent generation of C. pipiens/restuans hosts. Different mosquito genera harbored significantly different bacterial communities, and presence or abundance of Wolbachia was primarily associated with these differences. We identified several operational taxonomic units (OTUs) of Wolbachia that drive overall microbial community differentiation among mosquito taxa, locations and timepoints. Distinct Wolbachia OTUs were consistently found to dominate microbiomes of Cx. pipiens/restuans, and of Coquilletidia perturbans. Seasonal fluctuations of several other microbial taxa included Bacillus cereus, Enterococcus, Methylobacterium, Asaia, Pantoea, Acinetobacter johnsonii, Pseudomonas, and Mycoplasma. This suggests that microbiota may explain some of the variation in vector competence previously attributed to local environmental processes, especially because Wolbachia is known to affect carriage of viral pathogens.
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Affiliation(s)
- Eva Novakova
- Faculty of Science, University of South BohemiaCeske Budejovice, Czechia.,Biology Centre of ASCR, Institute of ParasitologyCeske Budejovice, Czechia
| | - Douglas C Woodhams
- Department of Biology, University of Massachusetts BostonBoston, MA, USA
| | | | | | - Jonathan W Leff
- Cooperative Institute for Research in Environmental Sciences, University of ColoradoBoulder, CO, USA.,Department of Ecology and Evolutionary Biology, University of ColoradoBoulder, CO, USA
| | | | - Amnon Amir
- Department of Computer Science and Engineering, Center for Microbiome Innovation, University of California San DiegoLa Jolla, CA, USA
| | - Rob Knight
- Department of Computer Science and Engineering, Center for Microbiome Innovation, University of California San DiegoLa Jolla, CA, USA.,Department of Pediatrics, University of California San DiegoLa Jolla, CA, USA
| | - James Scott
- Sporometrics IncToronto, ON, Canada.,Division of Occupational and Environmental Health, Dalla Lana School of Public Health, University of TorontoToronto, ON, Canada
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84
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Reliance of Wolbachia on High Rates of Host Proteolysis Revealed by a Genome-Wide RNAi Screen of Drosophila Cells. Genetics 2017; 205:1473-1488. [PMID: 28159754 DOI: 10.1534/genetics.116.198903] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 01/27/2017] [Indexed: 11/18/2022] Open
Abstract
Wolbachia are gram-negative, obligate, intracellular bacteria carried by a majority of insect species worldwide. Here we use a Wolbachia-infected Drosophila cell line and genome-wide RNA interference (RNAi) screening to identify host factors that influence Wolbachia titer. By screening an RNAi library targeting 15,699 transcribed host genes, we identified 36 candidate genes that dramatically reduced Wolbachia titer and 41 that increased Wolbachia titer. Host gene knockdowns that reduced Wolbachia titer spanned a broad array of biological pathways including genes that influenced mitochondrial function and lipid metabolism. In addition, knockdown of seven genes in the host ubiquitin and proteolysis pathways significantly reduced Wolbachia titer. To test the in vivo relevance of these results, we found that drug and mutant inhibition of proteolysis reduced levels of Wolbachia in the Drosophila oocyte. The presence of Wolbachia in either cell lines or oocytes dramatically alters the distribution and abundance of ubiquitinated proteins. Functional studies revealed that maintenance of Wolbachia titer relies on an intact host Endoplasmic Reticulum (ER)-associated protein degradation pathway (ERAD). Accordingly, electron microscopy studies demonstrated that Wolbachia is intimately associated with the host ER and dramatically alters the morphology of this organelle. Given Wolbachia lack essential amino acid biosynthetic pathways, the reliance of Wolbachia on high rates of host proteolysis via ubiquitination and the ERAD pathways may be a key mechanism for provisioning Wolbachia with amino acids. In addition, the reliance of Wolbachia on the ERAD pathway and disruption of ER morphology suggests a previously unsuspected mechanism for Wolbachia's potent ability to prevent RNA virus replication.
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85
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Dietzgen RG, Mann KS, Johnson KN. Plant Virus-Insect Vector Interactions: Current and Potential Future Research Directions. Viruses 2016; 8:E303. [PMID: 27834855 PMCID: PMC5127017 DOI: 10.3390/v8110303] [Citation(s) in RCA: 102] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2016] [Revised: 10/31/2016] [Accepted: 10/31/2016] [Indexed: 12/13/2022] Open
Abstract
Acquisition and transmission by an insect vector is central to the infection cycle of the majority of plant pathogenic viruses. Plant viruses can interact with their insect host in a variety of ways including both non-persistent and circulative transmission; in some cases, the latter involves virus replication in cells of the insect host. Replicating viruses can also elicit both innate and specific defense responses in the insect host. A consistent feature is that the interaction of the virus with its insect host/vector requires specific molecular interactions between virus and host, commonly via proteins. Understanding the interactions between plant viruses and their insect host can underpin approaches to protect plants from infection by interfering with virus uptake and transmission. Here, we provide a perspective focused on identifying novel approaches and research directions to facilitate control of plant viruses by better understanding and targeting virus-insect molecular interactions. We also draw parallels with molecular interactions in insect vectors of animal viruses, and consider technical advances for their control that may be more broadly applicable to plant virus vectors.
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Affiliation(s)
- Ralf G Dietzgen
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia QLD 4072, Australia.
| | - Krin S Mann
- Agriculture and Agri-Food Canada, Summerland Research and Development Centre, Summerland, BC V0H 1Z0, Canada.
| | - Karyn N Johnson
- School of Biological Sciences, The University of Queensland, St. Lucia QLD 4072, Australia.
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86
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Downregulation of Aedes aegypti chromodomain helicase DNA binding protein 7/Kismet by Wolbachia and its effect on dengue virus replication. Sci Rep 2016; 6:36850. [PMID: 27827425 PMCID: PMC5101808 DOI: 10.1038/srep36850] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 10/19/2016] [Indexed: 12/23/2022] Open
Abstract
Dengue virus (DENV) is a mosquito-transmitted virus imposing a significant burden on human health around the world. Since current control strategies are not sufficient, there is an urgent need to find alternative methods to control DENV transmission. It has been demonstrated that introduction of Wolbachia pipientis in Aedes aegypti mosquitoes can impede DENV transmission with the mechanism(s) not fully understood. Recently, a number of studies have found the involvement of chromodomain DNA binding helicases in case of Human Immunodeficiency virus (HIV) and Influenza A virus infection. In this study, we have identified three chromodomain helicase DNA binding protein (CHD) genes in Ae. aegypti and looked at their response in the case of Wolbachia and DENV infections. Foremost amongst them we have found that AeCHD7/Kismet is significantly downregulated in the presence of Wolbachia infection only in female mosquitoes. Furthermore, AeCHD7 levels showed significant increase during DENV infection, and AeCHD7 depletion led to severe reduction in the replication of DENV. Our data have identified AeCHD7 as a novel Ae. aegypti host factor that is important for DENV replication, and Wolbachia downregulates it, which may contribute towards the mechanism(s) of limiting DENV replication.
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87
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Kohl A, Pondeville E, Schnettler E, Crisanti A, Supparo C, Christophides GK, Kersey PJ, Maslen GL, Takken W, Koenraadt CJM, Oliva CF, Busquets N, Abad FX, Failloux AB, Levashina EA, Wilson AJ, Veronesi E, Pichard M, Arnaud Marsh S, Simard F, Vernick KD. Advancing vector biology research: a community survey for future directions, research applications and infrastructure requirements. Pathog Glob Health 2016; 110:164-72. [PMID: 27677378 PMCID: PMC5072118 DOI: 10.1080/20477724.2016.1211475] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Vector-borne pathogens impact public health, animal production, and animal welfare. Research on arthropod vectors such as mosquitoes, ticks, sandflies, and midges which transmit pathogens to humans and economically important animals is crucial for development of new control measures that target transmission by the vector. While insecticides are an important part of this arsenal, appearance of resistance mechanisms is increasingly common. Novel tools for genetic manipulation of vectors, use of Wolbachia endosymbiotic bacteria, and other biological control mechanisms to prevent pathogen transmission have led to promising new intervention strategies, adding to strong interest in vector biology and genetics as well as vector-pathogen interactions. Vector research is therefore at a crucial juncture, and strategic decisions on future research directions and research infrastructure investment should be informed by the research community. A survey initiated by the European Horizon 2020 INFRAVEC-2 consortium set out to canvass priorities in the vector biology research community and to determine key activities that are needed for researchers to efficiently study vectors, vector-pathogen interactions, as well as access the structures and services that allow such activities to be carried out. We summarize the most important findings of the survey which in particular reflect the priorities of researchers in European countries, and which will be of use to stakeholders that include researchers, government, and research organizations.
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Affiliation(s)
- Alain Kohl
- a MRC-University of Glasgow Centre for Virus Research , Glasgow , UK
| | - Emilie Pondeville
- a MRC-University of Glasgow Centre for Virus Research , Glasgow , UK
| | - Esther Schnettler
- a MRC-University of Glasgow Centre for Virus Research , Glasgow , UK
| | - Andrea Crisanti
- b Department of Life Sciences , Imperial College London , London , UK
| | - Clelia Supparo
- b Department of Life Sciences , Imperial College London , London , UK
| | | | - Paul J Kersey
- c The European Molecular Biology Laboratory , The European Bioinformatics Institute, Wellcome Trust Genome Campus , Cambridge , UK
| | - Gareth L Maslen
- c The European Molecular Biology Laboratory , The European Bioinformatics Institute, Wellcome Trust Genome Campus , Cambridge , UK
| | - Willem Takken
- d Laboratory of Entomology , Wageningen University and Research Centre , Wageningen , The Netherlands
| | | | - Clelia F Oliva
- e Polo d'Innovazione di Genomica, Genetica e Biologia , Perugia , Italy
| | - Núria Busquets
- f Centre de Recerca en Sanitat Animal (CReSA) , Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Campus UAB , Barcelona , Spain
| | - F Xavier Abad
- f Centre de Recerca en Sanitat Animal (CReSA) , Institut de Recerca i Tecnologia Agroalimentàries (IRTA), Campus UAB , Barcelona , Spain
| | - Anna-Bella Failloux
- g Arboviruses and Insect Vectors Unit, Department of Virology , Institut Pasteur , Paris cedex 15 , France
| | - Elena A Levashina
- h Department of Vector Biology , Max-Planck-Institut für Infektionsbiologie, Campus Charité Mitte , Berlin , Germany
| | - Anthony J Wilson
- i Integrative Entomology Group, Vector-borne Viral Diseases Programme , The Pirbright Institute , Surrey , UK
| | - Eva Veronesi
- j Swiss National Centre for Vector Entomology, Institute of Parasitology , University of Zürich , Zürich , Switzerland
| | - Maëlle Pichard
- k Department of Parasites and Insect Vectors , Institut Pasteur, Unit of Insect Vector Genetics and Genomics , Paris cedex 15 , France
| | - Sarah Arnaud Marsh
- k Department of Parasites and Insect Vectors , Institut Pasteur, Unit of Insect Vector Genetics and Genomics , Paris cedex 15 , France
| | - Frédéric Simard
- l MIVEGEC "Maladies Infectieuses et Vecteurs: Ecologie, Génétique, Evolution et Contrôle" , UMR IRD224-CNRS5290-Université de Montpellier , Montpellier France
| | - Kenneth D Vernick
- k Department of Parasites and Insect Vectors , Institut Pasteur, Unit of Insect Vector Genetics and Genomics , Paris cedex 15 , France.,m CNRS Unit of Hosts, Vectors and Pathogens (URA3012) , Institut Pasteur , Paris cedex 15 , France
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88
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Hafer N. Conflicts over host manipulation between different parasites and pathogens: Investigating the ecological and medical consequences. Bioessays 2016; 38:1027-37. [PMID: 27510821 PMCID: PMC5108444 DOI: 10.1002/bies.201600060] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
When parasites have different interests in regard to how their host should behave this can result in a conflict over host manipulation, i.e. parasite induced changes in host behaviour that enhance parasite fitness. Such a conflict can result in the alteration, or even complete suppression, of one parasite's host manipulation. Many parasites, and probably also symbionts and commensals, have the ability to manipulate the behaviour of their host. Non‐manipulating parasites should also have an interest in host behaviour. Given the frequency of multiple parasite infections in nature, potential conflicts of interest over host behaviour and manipulation may be common. This review summarizes the evidence on how parasites can alter other parasite's host manipulation. Host manipulation can have important ecological and medical consequences. I speculate on how a conflict over host manipulation could alter these consequences and potentially offer a new avenue of research to ameliorate harmful consequences of host manipulation.
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Affiliation(s)
- Nina Hafer
- Department of Evolutionary Ecology, Max-Planck-Institute for Evolutionary Biology, Plön, Germany.
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89
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Hall-Mendelin S, McLean BJ, Bielefeldt-Ohmann H, Hobson-Peters J, Hall RA, van den Hurk AF. The insect-specific Palm Creek virus modulates West Nile virus infection in and transmission by Australian mosquitoes. Parasit Vectors 2016; 9:414. [PMID: 27457250 PMCID: PMC4960669 DOI: 10.1186/s13071-016-1683-2] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2016] [Accepted: 07/05/2016] [Indexed: 11/26/2022] Open
Abstract
Background Insect-specific viruses do not replicate in vertebrate cells, but persist in mosquito populations and are highly prevalent in nature. These viruses may naturally regulate the transmission of pathogenic vertebrate-infecting arboviruses in co-infected mosquitoes. Following the isolation of the first Australian insect-specific flavivirus (ISF), Palm Creek virus (PCV), we investigated routes of infection and transmission of this virus in key Australian arbovirus vectors and its impact on replication and transmission of West Nile virus (WNV). Methods Culex annulirostris, Aedes aegypti and Aedes vigilax were exposed to PCV, and infection, replication and transmission rates in individual mosquitoes determined. To test whether the virus could be transmitted vertically, progeny reared from eggs oviposited by PCV-inoculated Cx. annulirostris were analysed for the presence of PCV. To assess whether prior infection of mosquitoes with PCV could also suppress the transmission of pathogenic flaviviruses, PCV positive or negative Cx. annulirostris were subsequently exposed to WNV. Results No PCV-infected Cx. annulirostris were detected 16 days after feeding on an infectious blood meal. However, when intrathoracically inoculated with PCV, Cx. annulirostris infection rates were 100 %. Similar rates of infection were observed in Ae. aegypti (100 %) and Ae. vigilax (95 %). Notably, PCV was not detected in any saliva expectorates collected from any of these species. PCV was not detected in 1038 progeny reared from 59 PCV-infected Cx. annulirostris. After feeding on a blood meal containing 107 infectious units of WNV, significantly fewer PCV-infected Cx. annulirostris were infected or transmitted WNV compared to PCV negative mosquitoes. Immunohistochemistry revealed that PCV localized in the midgut epithelial cells, which are the first site of infection with WNV. Conclusions Our results indicate that PCV cannot infect Cx. annulirostris via the oral route, nor be transmitted in saliva or vertically to progeny. We also provide further evidence that prior infection with insect-specific viruses can regulate the infection and transmission of pathogenic arboviruses.
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Affiliation(s)
- Sonja Hall-Mendelin
- Public Health Virology, Forensic and Scientific Services, Department of Health, Queensland Government, PO Box 594, Archerfield, 4108, QLD, Australia
| | - Breeanna J McLean
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, 4072, QLD, Australia
| | - Helle Bielefeldt-Ohmann
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, 4072, QLD, Australia.,School of Veterinary Science, The University of Queensland, Gatton Campus, Gatton, 4343, QLD, Australia
| | - Jody Hobson-Peters
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, 4072, QLD, Australia
| | - Roy A Hall
- Australian Infectious Diseases Research Centre, School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, 4072, QLD, Australia
| | - Andrew F van den Hurk
- Public Health Virology, Forensic and Scientific Services, Department of Health, Queensland Government, PO Box 594, Archerfield, 4108, QLD, Australia.
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90
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Boëte C, Reeves RG. Alternative vector control methods to manage the Zika virus outbreak: more haste, less speed. LANCET GLOBAL HEALTH 2016; 4:e363. [DOI: 10.1016/s2214-109x(16)00084-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2016] [Accepted: 03/10/2016] [Indexed: 12/20/2022]
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91
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Wong ZS, Brownlie JC, Johnson KN. Impact of ERK activation on fly survival and Wolbachia-mediated protection during virus infection. J Gen Virol 2016; 97:1446-1452. [PMID: 26977591 DOI: 10.1099/jgv.0.000456] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Elevated levels of reactive oxygen species (ROS) provide protection against virus-induced mortality in Drosophila. In addition to contributing to oxidative stress, ROS are known to activate a number of signalling pathways including the extracellular signal-regulated kinases (ERK) signalling cascade. It was recently shown that ERK signalling is important for resistance against viral replication and invasion in cultured Drosophila cells and the gut epithelium of adult flies. Here, using a Drosophila loss-of-function ERK (rolled) mutant we demonstrated that ERK is important for fly survival during virus infection. ERK mutant flies subjected to Drosophila C virus (DCV) oral and systemic infection were more susceptible to virus-induced mortality as compared with wild-type flies. We have demonstrated experimentally that ERK activation is important for fly survival during oral and systemic virus infection. Given that elevated ROS correlates with Wolbachia-mediated antiviral protection, we also investigated the involvement of ERK in antiviral protection in flies infected by Wolbachia. The results indicate that ERK activation is increased in the presence of Wolbachia but this does not appear to influence Wolbachia-mediated antiviral protection, at least during systemic infection.
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Affiliation(s)
- Zhee Sheen Wong
- School of Biological Sciences, University of Queensland, St Lucia, Brisbane, Australia
| | - Jeremy C Brownlie
- School of Natural Sciences, Griffith University, Brisbane, Australia
| | - Karyn N Johnson
- School of Biological Sciences, University of Queensland, St Lucia, Brisbane, Australia
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92
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Clem RJ. Arboviruses and apoptosis: the role of cell death in determining vector competence. J Gen Virol 2016; 97:1033-1036. [PMID: 26872460 DOI: 10.1099/jgv.0.000429] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A relatively small number of mosquito species transmit arboviruses such as dengue, yellow fever, chikungunya and West Nile viruses to hundreds of millions of people each year, yet we still lack a thorough understanding of the molecular factors that determine vector competence. Apoptosis has been shown to be an important factor in determining the outcome of virus infection for many viruses. However, until recently, it was not clear whether apoptosis plays a role in determining the outcome of arbovirus infections in mosquitoes. Recent work has begun to shed light on the roles of apoptosis in this important process.
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Affiliation(s)
- Rollie J Clem
- Division of Biology, Kansas State University, Manhattan, KS 66506, USA
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