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Hafsia S, Barbar T, Alout H, Baudino F, Lebon C, Gomard Y, Wilkinson DA, Fourié T, Mavingui P, Atyame C. Vector competence of Aedes albopictus field populations from Reunion Island exposed to local epidemic dengue viruses. PLoS One 2024; 19:e0310635. [PMID: 39298440 DOI: 10.1371/journal.pone.0310635] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Accepted: 09/04/2024] [Indexed: 09/21/2024] Open
Abstract
Dengue virus (DENV) is the most prevalent mosquito-borne Flavivirus that affects humans worldwide. Aedes albopictus, which is naturally infected with the bacteria Wolbachia, is considered to be a secondary vector of DENV. However, it was responsible for a recent DENV outbreak of unprecedented magnitude in Reunion Island, a French island in the South West Indian Ocean. Moreover, the distribution of the cases during this epidemic showed a spatially heterogeneous pattern across the island, leading to questions about the differential vector competence of mosquito populations from different geographic areas. The aim of this study was to gain a better understanding of the vector competence of the Ae. albopictus populations from Reunion Island for local DENV epidemic strains, while considering their infection by Wolbachia. Experimental infections were conducted using ten populations of Ae. albopictus sampled across Reunion Island and exposed to three DENV strains: one strain of DENV serotype 1 (DENV-1) and two strains of DENV serotype 2 (DENV-2). We analyzed three vector competence parameters including infection rate, dissemination efficiency and transmission efficiency, at different days post-exposition (dpe). We also assessed whether there was a correlation between the density of Wolbachia and viral load/vector competence parameters. Our results show that the Ae. albopictus populations tested were not able to transmit the two DENV-2 strains, while transmission efficiencies up to 40.79% were observed for the DENV-1 strain, probably due to difference in viral titres. Statistical analyses showed that the parameters mosquito population, generation, dpe and area of sampling significantly affect the transmission efficiencies of DENV-1. Although the density of Wolbachia varied according to mosquito population, no significant correlation was found between Wolbachia density and either viral load or vector competence parameters for DENV-1. Our results highlight the importance of using natural mosquito populations for a better understanding of transmission patterns of dengue.
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Affiliation(s)
- Sarah Hafsia
- Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), CNRS 9192, INSERM 1187, IRD 249, La Réunion, France
| | - Tatiana Barbar
- Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), CNRS 9192, INSERM 1187, IRD 249, La Réunion, France
| | - Haoues Alout
- Unité Mixte de Recherche Animal Santé Territoires Risques Écosystèmes, F-34398, CIRAD/INRAE/Université de Montpellier, Université de Montpellier, Montpellier, France
| | - Fiona Baudino
- Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), CNRS 9192, INSERM 1187, IRD 249, La Réunion, France
| | - Cyrille Lebon
- Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), CNRS 9192, INSERM 1187, IRD 249, La Réunion, France
| | - Yann Gomard
- Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), CNRS 9192, INSERM 1187, IRD 249, La Réunion, France
| | - David A Wilkinson
- Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), CNRS 9192, INSERM 1187, IRD 249, La Réunion, France
| | - Toscane Fourié
- Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), CNRS 9192, INSERM 1187, IRD 249, La Réunion, France
| | - Patrick Mavingui
- Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), CNRS 9192, INSERM 1187, IRD 249, La Réunion, France
| | - Célestine Atyame
- Université de La Réunion, UMR PIMIT (Processus Infectieux en Milieu Insulaire Tropical), CNRS 9192, INSERM 1187, IRD 249, La Réunion, France
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2
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Pathak B, Chakarvarty A, Rani NV, Krishnan A. Serological immune biomarker for disease severity in dengue-infected pediatric hospitalized patients. J Med Virol 2024; 96:e29779. [PMID: 38975640 DOI: 10.1002/jmv.29779] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 05/22/2024] [Accepted: 06/25/2024] [Indexed: 07/09/2024]
Abstract
Clinical manifestation of dengue disease ranges from asymptomatic, febrile fever without warning sign (DOS) to serious outcome dengue with warning sign (DWS) and severe disease (SD) leading to shock syndrome and death. The role of antibody response in natural dengue infection is complex and not completely understood. Here, we aimed to assess serological marker for disease severity. Antibody response of dengue-confirmed pediatric patients with acute secondary infection were evaluated against infecting virus, immature virus, and recombinant envelop protein. Immature virus antibody titers were significantly higher in DWS as compared to DOS (p = 0.0006). However, antibody titers against recombinant envelop protein were higher in DOS as compared to DWS, and antibody avidity was significantly higher against infecting virus in DOS. Serum samples of DOS patients displayed higher in vitro neutralization potential in plaque assay as compared to DWS, whereas DWS serum samples showed higher antibody-dependent enhancement in the in vitro enhancement assays. Thus, antibodies targeting immature virus can predict disease severity and could be used in early forecast of disease outcome using an enzyme-linked immunoassay assay system which is less laborious and cheaper than plaque assay system for correlates of protection and could help optimize medical care and resources.
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Affiliation(s)
- Bharti Pathak
- Department of Molecular Medicine, Jamia Hamdard, Hamdard Nagar, New Delhi, India
| | - Aparna Chakarvarty
- Department of Paediatrics, Hamdard Institute of Medical Sciences and Research, Jamia Hamdard, New Delhi, India
- Department of Paediatrics, Amrita Institute of Medical Sciences, Faridabad, Haryana, India
| | | | - Anuja Krishnan
- Department of Molecular Medicine, Jamia Hamdard, Hamdard Nagar, New Delhi, India
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Sun Y, He L, Li X, Li C, Yan S, Zhang Y, Sun Z. Unraveling the Genomic Evolution of Dengue Virus Serotype 1: A Case Study from Yantai, China. Life (Basel) 2024; 14:808. [PMID: 39063563 PMCID: PMC11278097 DOI: 10.3390/life14070808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2024] [Revised: 06/12/2024] [Accepted: 06/20/2024] [Indexed: 07/28/2024] Open
Abstract
In August 2023, we identified a case of dengue fever in Yantai City, which was imported from Xishuangbanna, China. To investigate its evolutionary history and population dynamics, we utilized the metatranscriptomic method to obtain the virus' whole genome sequence. Together with 367 selected dengue virus whole genome sequences from the NCBI database, we constructed a time-scaled Maximum Clade Credibility (MCC) tree. We found that our sequence exhibited a high homology with a sequence of DENV1 (OR418422.1) uploaded by the Guangzhou Center for Disease Control and Prevention in 2023, with an estimated divergence time around 2019 (95% HPD: 2017-2023), coinciding with the emergence of SARS-CoV-2. The DENV strain obtained in this study belongs to genotype I of DENV1. Its ancestors experienced a global epidemic around 2005 (95% HPD: 2002-2010), and its progeny strains have spread extensively in Southeast Asia and China since around 2007 (95% HPD: 2006-2011). The Bayesian skyline plot indicates that the current population of DENV1 has not been affected by SARS-CoV-2 and is expected to maintain stable transmission. Hence, it is imperative to track and monitor its epidemiological trends and genomic variations to prevent potential large-scale outbreaks in the post-SARS-CoV-2 era.
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Affiliation(s)
| | | | | | | | | | - Yi Zhang
- Yantai Center for Disease Control and Prevention, Yantai 264003, China; (Y.S.); (L.H.)
| | - Zhenlu Sun
- Yantai Center for Disease Control and Prevention, Yantai 264003, China; (Y.S.); (L.H.)
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Sarker R, Roknuzzaman ASM, Haque MA, Islam MR, Kabir ER. Upsurge of dengue outbreaks in several WHO regions: Public awareness, vector control activities, and international collaborations are key to prevent spread. Health Sci Rep 2024; 7:e2034. [PMID: 38655420 PMCID: PMC11035754 DOI: 10.1002/hsr2.2034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/10/2023] [Accepted: 03/19/2024] [Indexed: 04/26/2024] Open
Abstract
Background Dengue, the world's fastest-growing vector-borne disease, has skyrocketed in the 21st century. Dengue has harmed human health since its first known cases among Spanish soldiers in the Philippines to its 21st-century outbreaks in Southeast Asia, the Pacific, and the Americas. In light of the current circumstances, it is imperative to investigate its origin and prevalence, enabling the implementation of effective interventions to curb the upsurge. Methods Our study examines the history of dengue outbreaks, and evolving impact on public health, aiming to offer valuable insights for a more resilient public health response worldwide. In this comprehensive review, we incorporated data from renowned databases such as PubMed, Google Scholar, and Scopus to provide a thorough analysis of dengue outbreaks. Results Recent dengue outbreaks are associated with rapid urbanization, international travel, climatic change, and socioeconomic factors. Rapid urbanization and poor urban design and sanitation have created mosquito breeding places for dengue vectors. Also, international travel and trade have spread the pathogen. Climate change in the past two decades has favored mosquito habitats and outbreaks. Socioeconomic differences have also amplified the impact of dengue outbreaks on vulnerable communities. Dengue mitigation requires vector control, community engagement, healthcare strengthening, and international cooperation. Conclusion Climate change adaptation and urban planning are crucial. Although problems remain, a comprehensive vector control and community involvement plan may reduce dengue epidemics and improve public health in our interconnected world.
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Affiliation(s)
- Rapty Sarker
- Department of PharmacyUniversity of Asia PacificDhakaBangladesh
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5
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Sarker A, Dhama N, Gupta RD. Dengue virus neutralizing antibody: a review of targets, cross-reactivity, and antibody-dependent enhancement. Front Immunol 2023; 14:1200195. [PMID: 37334355 PMCID: PMC10272415 DOI: 10.3389/fimmu.2023.1200195] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 05/19/2023] [Indexed: 06/20/2023] Open
Abstract
Dengue is the most common viral infection spread by mosquitoes, prevalent in tropical countries. The acute dengue virus (DENV) infection is a benign and primarily febrile illness. However, secondary infection with alternative serotypes can worsen the condition, leading to severe and potentially fatal dengue. The antibody raised by the vaccine or the primary infections are frequently cross-reactive; however, weakly neutralizing, and during subsequent infection, they may increase the odds of antibody-dependent enhancement (ADE). Despite that, many neutralizing antibodies have been identified against the DENV, which are thought to be useful in reducing dengue severity. Indeed, an antibody must be free from ADE for therapeutic application, as it is pretty common in dengue infection and escalates disease severity. Therefore, this review has described the critical characteristics of DENV and the potential immune targets in general. The primary emphasis is given to the envelope protein of DENV, where potential epitopes targeted for generating serotype-specific and cross-reactive antibodies have critically been described. In addition, a novel class of highly neutralizing antibodies targeted to the quaternary structure, similar to viral particles, has also been described. Lastly, we have discussed different aspects of the pathogenesis and ADE, which would provide significant insights into developing safe and effective antibody therapeutics and equivalent protein subunit vaccines.
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6
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Lambrechts L. Does arbovirus emergence in humans require adaptation to domestic mosquitoes? Curr Opin Virol 2023; 60:101315. [PMID: 36996522 DOI: 10.1016/j.coviro.2023.101315] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 02/01/2023] [Accepted: 02/23/2023] [Indexed: 03/30/2023]
Abstract
In the last few decades, several mosquito-borne arboviruses of zoonotic origin have established large-scale epidemic transmission cycles in the human population. It is often considered that arbovirus emergence is driven by adaptive evolution, such as virus adaptation for transmission by 'domestic' mosquito vector species that live in close association with humans. Here, I argue that although arbovirus adaptation to domestic mosquito vectors has been observed for several emerging arboviruses, it was generally not directly responsible for their initial emergence. Secondary adaptation to domestic mosquitoes often amplified epidemic transmission, however, this was more likely a consequence than a cause of arbovirus emergence. Considering that emerging arboviruses are generally 'preadapted' for transmission by domestic mosquito vectors may help to enhance preparedness toward future arbovirus emergence events.
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Hafsia S, Barbar T, Wilkinson DA, Atyame C, Biscornet L, Bibi J, Louange M, Gedeon J, De Santis O, Flahault A, Cabie A, Bertolotti A, Mavingui P. Genetic characterization of dengue virus serotype 1 circulating in Reunion Island, 2019-2021, and the Seychelles, 2015-2016. BMC Infect Dis 2023; 23:294. [PMID: 37147570 PMCID: PMC10161969 DOI: 10.1186/s12879-023-08125-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Accepted: 02/28/2023] [Indexed: 05/07/2023] Open
Abstract
BACKGROUND An unprecedent increase in the number of cases and deaths reported from dengue virus (DENV) infection has occurred in the southwestern Indian ocean in recent years. From 2017 to mid-2021 more than 70,000 confirmed dengue cases were reported in Reunion Island, and 1967 cases were recorded in the Seychelles from 2015 to 2016. Both these outbreaks displayed similar trends, with the initial circulation of DENV-2 which was replaced by DENV-1. Here, we aim to determine the origin of the DENV-1 epidemic strains and to explore their genetic characteristics along the uninterrupted circulation, particularly in Reunion. METHODS Nucleic acids were extracted from blood samples collected from dengue positive patients; DENV-1 was identified by RT-qPCR. Positive samples were used to infect VERO cells. Genome sequences were obtained from either blood samples or infected-cell supernatants through a combination of both Illumina or MinION technologies. RESULTS Phylogenetic analyses of partial or whole genome sequences revealed that all DENV-1 sequences from Reunion formed a monophyletic cluster that belonged to genotype I and were closely related to one isolate from Sri Lanka (OL752439.1, 2020). Sequences from the Seychelles belonged to the same major phylogenetic branch of genotype V, but fell into two paraphyletic clusters, with greatest similarity for one cluster to 2016-2017 isolate from Bangladesh, Singapore and China, and for the other cluster to ancestral isolates from Singapore, dating back to 2012. Compared to publicly available DENV-1 genotype I sequences, fifteen non-synonymous mutations were identified in the Reunion strains, including one in the capsid and the others in nonstructural proteins (NS) (three in NS1, two in NS2B, one in NS3, one in NS4B, and seven in NS5). CONCLUSION In contrast to what was seen in previous outbreaks, recent DENV-1 outbreaks in Reunion and the Seychelles were caused by distinct genotypes, all likely originating from Asia where dengue is (hyper)endemic in many countries. Epidemic DENV-1 strains from Reunion harbored specific non-synonymous mutations whose biological significance needs to be further investigated.
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Affiliation(s)
- Sarah Hafsia
- UMR Processus Infectieux en Milieu Insulaire Tropical (PIMIT), Université de La Réunion, CNRS 9192, INSERM U1187, IRD 249, Plateforme CYROI, Sainte Clotilde, La Réunion, France
| | - Tatiana Barbar
- UMR Processus Infectieux en Milieu Insulaire Tropical (PIMIT), Université de La Réunion, CNRS 9192, INSERM U1187, IRD 249, Plateforme CYROI, Sainte Clotilde, La Réunion, France
| | - David A Wilkinson
- UMR Processus Infectieux en Milieu Insulaire Tropical (PIMIT), Université de La Réunion, CNRS 9192, INSERM U1187, IRD 249, Plateforme CYROI, Sainte Clotilde, La Réunion, France
| | - Célestine Atyame
- UMR Processus Infectieux en Milieu Insulaire Tropical (PIMIT), Université de La Réunion, CNRS 9192, INSERM U1187, IRD 249, Plateforme CYROI, Sainte Clotilde, La Réunion, France
| | - Leon Biscornet
- Public Health Authority, Ministry of Health, Victoria, Seychelles
| | - Jastin Bibi
- Disease Surveillance and Response Unit, Epidemiology and Statistics Section, Public Health Authority, Ministry of Health, Victoria, Seychelles
| | - Meggy Louange
- Public Health Authority, Ministry of Health, Victoria, Seychelles
| | - Jude Gedeon
- Public Health Authority, Ministry of Health, Victoria, Seychelles
| | - Olga De Santis
- Institute of global health, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - Antoine Flahault
- Institute of global health, Faculty of Medicine, University of Geneva, Geneva, Switzerland
| | - André Cabie
- CHU de Martinique, service de maladies infectieuses et tropicales, INSERM, CHU de Martinique, PCCEI, Univ Montpellier, Univ Antilles, INSERM, EFS, CIC1424, Fort-de-France, Montpellier, France
| | - Antoine Bertolotti
- Service des Maladies Infectieuses - Dermatologie, CHU Réunion, INSERM CIC1410, Saint Pierre, Saint Pierre, La Réunion, France
| | - Patrick Mavingui
- UMR Processus Infectieux en Milieu Insulaire Tropical (PIMIT), Université de La Réunion, CNRS 9192, INSERM U1187, IRD 249, Plateforme CYROI, Sainte Clotilde, La Réunion, France.
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8
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Li D, Long M, Li T, Shu Y, Shan X, Zhang J, Ma D, Long S, Wang X, Jia F, Pan Y, Chen J, Liu P, Sun Q. The whole-genome sequencing of prevalent DENV-1 strains during the largest dengue virus outbreak in Xishuangbanna Dai autonomous prefecture in 2019. J Med Virol 2023; 95:e28115. [PMID: 36059257 DOI: 10.1002/jmv.28115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 08/25/2022] [Accepted: 08/30/2022] [Indexed: 01/11/2023]
Abstract
In 2019, a serious dengue virus (DENV) infection broke out in the Xishuangbanna Dai Autonomous Prefecture, China. Therefore, we conducted a molecular epidemiological analysis in people that contracted DENV serotype 1 (DENV-1) during this year. We analyzed the molecular epidemiology of six DENV-1 epidemic strains in 2019 by full-length genome sequencing, amino acid mutation site analysis, evolutionary tree analysis, and recombination site comparison analysis. Through the analysis of amino acid mutation sites, it was found that DENV-1 strain (MW386867) was different from the other five epidemic DENV-1 strains in Xishuangbanna in 2019. MW386867 had unique mutation sites at six loci. The six epidemic DENV-1 strains in Xishuangbanna in 2019 were divided into two clusters. MW386867 was highly similar to the MG679800 (Myanmar 2017), MG679801 (Myanmar 2017), and KC172834 (Laos 2008), and the other five strains were highly similar to JQ045660 (Vietnam 2011), FJ176780 (GuangDong 2006). Genetic recombination analysis revealed that there was no recombination signal in the six epidemic DENV-1 strains in Xishuangbanna in 2019. We speculate that the DENV-1 epidemic in 2019 has a co-epidemic of local strains and cross-border strains.
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Affiliation(s)
- Daiying Li
- Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vector-Borne Infectious Disease, Kunming, People's Republic of China
| | - MingWang Long
- Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vector-Borne Infectious Disease, Kunming, People's Republic of China
| | - Tingting Li
- Xishuangbanna Dai Autonomous Prefecture People's Hospital, Xishuangbanna, People's Republic of China
| | - Yun Shu
- Xishuangbanna Dai Autonomous Prefecture People's Hospital, Xishuangbanna, People's Republic of China
| | - Xiyun Shan
- Xishuangbanna Dai Autonomous Prefecture People's Hospital, Xishuangbanna, People's Republic of China
| | - Juan Zhang
- Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vector-Borne Infectious Disease, Kunming, People's Republic of China.,Institute of Medical Biology, Kunming Medical University, Kunming, People's Republic of China
| | - Dehong Ma
- Xishuangbanna Dai Autonomous Prefecture People's Hospital, Xishuangbanna, People's Republic of China
| | - Shuying Long
- Institute of Medical Biology, Kunming Medical University, Kunming, People's Republic of China
| | - Xiaodan Wang
- Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vector-Borne Infectious Disease, Kunming, People's Republic of China
| | - Fan Jia
- Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vector-Borne Infectious Disease, Kunming, People's Republic of China.,Institute of Medical Biology, Kunming Medical University, Kunming, People's Republic of China
| | - Yue Pan
- Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vector-Borne Infectious Disease, Kunming, People's Republic of China
| | - Junying Chen
- Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vector-Borne Infectious Disease, Kunming, People's Republic of China
| | - Pinghua Liu
- Xishuangbanna Dai Autonomous Prefecture People's Hospital, Xishuangbanna, People's Republic of China
| | - Qiangming Sun
- Institute of Medical Biology, Chinese Academy of Medical Sciences, and Peking Union Medical College, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vaccine Research & Development on Severe Infectious Diseases, Kunming, People's Republic of China.,Yunnan Key Laboratory of Vector-Borne Infectious Disease, Kunming, People's Republic of China
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9
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Chen L, Zhang X, Guo X, Peng W, Zhu Y, Wang Z, Yu X, Shi H, Li Y, Zhang L, Wang L, Wang P, Cheng G. Neighboring mutation-mediated enhancement of dengue virus infectivity and spread. EMBO Rep 2022; 23:e55671. [PMID: 36197120 PMCID: PMC9638853 DOI: 10.15252/embr.202255671] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 09/06/2022] [Accepted: 09/07/2022] [Indexed: 10/07/2023] Open
Abstract
Frequent turnover of dengue virus (DENV) clades is one of the major forces driving DENV persistence and prevalence. In this study, we assess the fitness advantage of nine stable substitutions within the envelope (E) protein of DENV serotypes. Two tandem neighboring substitutions, threonine to lysine at the 226th (T226K) and glycine to glutamic acid at the 228th (G228E) residues in the DENV2 Asian I genotype, enhance virus infectivity in either mosquitoes or mammalian hosts, thereby promoting clades turnover and dengue epidemics. Mechanistic studies indicate that the substitution-mediated polarity changes in these two residues increase the binding affinity of E for host C-type lectins. Accordingly, we predict that a G228E substitution could potentially result in a forthcoming epidemic of the DENV2 Cosmopolitan genotype. Investigations into the substitutions associated with DENV fitness in hosts may offer mechanistic insights into dengue prevalence, thus providing a warning of potential epidemics in the future.
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Affiliation(s)
- Lu Chen
- Tsinghua‐Peking Joint Center for Life Sciences, School of MedicineTsinghua UniversityBeijingChina
| | - Xianwen Zhang
- Institute of Infectious DiseasesShenzhen Bay LaboratoryShenzhenChina
| | - Xuan Guo
- Tsinghua‐Peking Joint Center for Life Sciences, School of MedicineTsinghua UniversityBeijingChina
| | - Wenyu Peng
- Tsinghua‐Peking Joint Center for Life Sciences, School of MedicineTsinghua UniversityBeijingChina
| | - Yibin Zhu
- Tsinghua‐Peking Joint Center for Life Sciences, School of MedicineTsinghua UniversityBeijingChina
| | - Zhaoyang Wang
- Tsinghua‐Peking Joint Center for Life Sciences, School of MedicineTsinghua UniversityBeijingChina
| | - Xi Yu
- Tsinghua‐Peking Joint Center for Life Sciences, School of MedicineTsinghua UniversityBeijingChina
| | - Huicheng Shi
- Tsinghua‐Peking Joint Center for Life Sciences, School of MedicineTsinghua UniversityBeijingChina
| | - Yuhan Li
- Tsinghua‐Peking Joint Center for Life Sciences, School of MedicineTsinghua UniversityBeijingChina
| | - Liming Zhang
- Tsinghua‐Peking Joint Center for Life Sciences, School of MedicineTsinghua UniversityBeijingChina
| | - Lei Wang
- Institute of Infectious DiseasesShenzhen Bay LaboratoryShenzhenChina
| | - Penghua Wang
- Department of Immunology, School of Medicinethe University of Connecticut Health CenterFarmingtonCTUSA
| | - Gong Cheng
- Tsinghua‐Peking Joint Center for Life Sciences, School of MedicineTsinghua UniversityBeijingChina
- Institute of Infectious DiseasesShenzhen Bay LaboratoryShenzhenChina
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10
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Lu J, Chen L, Du P, Guo J, Wang X, Jiang Y, Yu Y, Wang R, Yang Z. A human monoclonal antibody to neutralize all four serotypes of dengue virus derived from patients at the convalescent phase of infection. Virology 2022; 576:74-82. [PMID: 36183498 DOI: 10.1016/j.virol.2022.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 09/12/2022] [Accepted: 09/18/2022] [Indexed: 11/16/2022]
Abstract
Dengue virus (DENV) is a prevalent mosquito-transmitted human pathogen, causing about 100 million cases of acute dengue fever and 21,000 deaths annually worldwide. Therapeutic neutralizing antibodies against dengue virus might be effective to treat severe dengue fever. Here, we showed that human monoclonal antibody (HMAb) 9C7 bound to all four intact serotypes of DENV but not to the recombinant envelope protein, suggesting HMAb 9C7 recognized a conformational epitope of the envelope protein. Taken together our results suggested that HMAb 9C7 neutralized all four serotypes of DENV in vitro and, for DENV-1, indicated activity at the pre- and post-attachment steps in the viral life cycle. HMAb 9C7 potently protected suckling mice from lethal challenge with all four serotypes of DENV. FcγRII-mediated uptake of immune complexes and antibody-dependent enhancement at low doses of the antibody were abolished by two Leu-to-Ala (9C7-LALA) mutations or deletion of nine amino acids (9C7-9del) in HMAb 9C7 Fc. Therefore, HMAb 9C7 represented a promising prophylactic and therapeutic agent against all four serotypes of DENV.
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Affiliation(s)
- Jiansheng Lu
- Laboratory of Protein Engineering, Beijing Institute of Biotechnology, Beijing, China
| | - Lei Chen
- Laboratory of Protein Engineering, Beijing Institute of Biotechnology, Beijing, China
| | - Peng Du
- Laboratory of Protein Engineering, Beijing Institute of Biotechnology, Beijing, China
| | - Jiazheng Guo
- Laboratory of Protein Engineering, Beijing Institute of Biotechnology, Beijing, China
| | - Xi Wang
- Laboratory of Protein Engineering, Beijing Institute of Biotechnology, Beijing, China
| | - Yujia Jiang
- Laboratory of Protein Engineering, Beijing Institute of Biotechnology, Beijing, China
| | - Yunzhou Yu
- Laboratory of Protein Engineering, Beijing Institute of Biotechnology, Beijing, China.
| | - Rong Wang
- Laboratory of Protein Engineering, Beijing Institute of Biotechnology, Beijing, China.
| | - Zhixin Yang
- Laboratory of Protein Engineering, Beijing Institute of Biotechnology, Beijing, China.
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11
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Waseem S, Ahmed SH, Shaikh TG, Qadar LT, Khalid S, Nimavat N, Hasan MM. Mysterious dengue-like virus: A case report from Pakistan. Clin Case Rep 2022; 10:e6107. [PMID: 35865785 PMCID: PMC9291263 DOI: 10.1002/ccr3.6107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2022] [Revised: 06/09/2022] [Accepted: 06/11/2022] [Indexed: 11/25/2022] Open
Abstract
Recently, in Pakistan, several cases of mysterious dengue-like illness are being reported, which has concerned the authorities and requires prompt action. We present a case of a 52-year-old female patient presenting with a history of continuous fever, documented up to 104 F, for 5 days. The symptoms were associated with headache, nausea, retro-orbital headache, arthralgia, and myalgia. Currently, to the best of our knowledge, this is the first reported case in the literature for the endemic mysterious virus and may serve as the groundwork for future studies.
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Affiliation(s)
- Summaiyya Waseem
- Department of Internal MedicineDow University of Health SciencesKarachiPakistan
| | - Syed Hassan Ahmed
- Department of Internal MedicineDow University of Health SciencesKarachiPakistan
| | - Taha Gul Shaikh
- Department of Internal MedicineDow University of Health SciencesKarachiPakistan
| | - Laila Tul Qadar
- Department of Internal MedicineDow University of Health SciencesKarachiPakistan
| | - Saad Khalid
- Department of Internal MedicineDow University of Health SciencesKarachiPakistan
| | - Nirav Nimavat
- Department of Community MedicineDr. Kiran C Patel Medical College and InstituteBharuchIndia
| | - Mohammad Mehedi Hasan
- Department of Biochemistry and Molecular Biology, Faculty of Life ScienceMawlana Bhashani Science and Technology UniversityTangailBangladesh
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12
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Stica CJ, Barrero RA, Murray RZ, Devine GJ, Phillips MJ, Frentiu FD. Global Evolutionary History and Dynamics of Dengue Viruses Inferred from Whole Genome Sequences. Viruses 2022; 14:v14040703. [PMID: 35458433 PMCID: PMC9030598 DOI: 10.3390/v14040703] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2022] [Revised: 03/18/2022] [Accepted: 03/25/2022] [Indexed: 12/20/2022] Open
Abstract
Dengue is an arboviral disease caused by dengue virus (DENV), leading to approximately 25,000 deaths/year and with over 40% of the world’s population at risk. Increased international travel and trade, poorly regulated urban expansion, and warming global temperatures have expanded the geographic range and incidence of the virus in recent decades. This study used phylogenetic and selection pressure analyses to investigate trends in DENV evolution, using whole genome coding sequences from publicly available databases alongside newly sequenced isolates collected between 1963–1997 from Southeast Asia and the Pacific. Results revealed very similar phylogenetic relationships when using the envelope gene and the whole genome coding sequences. Although DENV evolution is predominantly driven by negative selection, a number of amino acid sites undergoing positive selection were found across the genome, with the majority located in the envelope and NS5 genes. Some genotypes appear to be diversifying faster than others within each serotype. The results from this research improve our understanding of DENV evolution, with implications for disease control efforts such as Wolbachia-based biocontrol and vaccine design.
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Affiliation(s)
- Caleb J. Stica
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, 300 Herston Road, Herston, QLD 4006, Australia;
| | - Roberto A. Barrero
- eResearch Office, Division of Research and Innovation, Queensland University of Technology, P Block, 2 George Street, Brisbane, QLD 4000, Australia;
| | - Rachael Z. Murray
- School of Biomedical Sciences, Faculty of Health, Queensland University of Technology, KG-Q Block, 60 Musk Avenue, Kelvin Grove, Brisbane, QLD 4059, Australia;
| | - Gregor J. Devine
- Mosquito Control Lab, QIMR Berghofer Medical Research Institute, 300 Herston Road, Herston, QLD 4006, Australia;
| | - Matthew J. Phillips
- School of Biology and Environmental Science, Queensland University of Technology, R Block, 2 George Street, Brisbane, QLD 4000, Australia;
| | - Francesca D. Frentiu
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, 300 Herston Road, Herston, QLD 4006, Australia;
- Correspondence:
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13
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Sarker A, Rathore AS, Khalid MF, Gupta RD. Structure-guided affinity maturation of a single-chain variable fragment antibody against the Fu-bc epitope of the dengue virus envelope protein. J Biol Chem 2022; 298:101772. [PMID: 35218775 PMCID: PMC8956951 DOI: 10.1016/j.jbc.2022.101772] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 02/17/2022] [Accepted: 02/19/2022] [Indexed: 11/05/2022] Open
Abstract
Dengue is one of the most dominant arthropod-borne viral diseases, infecting at least 390 million people every year throughout the world. Despite this, there is no effective treatment against dengue, and the only available vaccine has already been withdrawn owing to the significant adverse effects. Therefore, passive immunotherapy using monoclonal antibodies is now being sought as a therapeutic option. To date, many dengue monoclonal antibodies have been identified, most of which are serotype-specific, and only a few of which are cross-reactive. Furthermore, antibodies that cross-react within serotypes are weakly neutralizing and frequently induce antibody-dependent enhancement, which promotes viral entry and replication. Therefore, broadly neutralizing antibodies with no risk of antibody-dependent enhancement are required for the treatment of dengue. Here, we developed a single-chain variable fragment (scFv) antibody from an anti-fusion loop E53 antibody (PDB: 2IGF). We introduced previously predicted favorable complementarity-determining region (CDR) mutations into the gene encoding the scFv antibody for affinity maturation, and the resultant variants were tested in vitro against the highly conserved fusion and bc epitope of the dengue virus envelope protein. We show some of these scFv variants with two to three substitution mutations in three different CDRs possess affinity constants (KD) ranging from 20 to 200 nM. The scFv-mutant15, containing D31L, Y105W, and S227W substitutions, showed the lowest affinity constant, (KD = 24 ± 7 nM), approximately 100-fold lower than its parental construct. We propose that the scFv-derivative antibody may be a good candidate for the development of an effective and safe immunotherapy.
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Affiliation(s)
- Animesh Sarker
- Faculty of Life Sciences and Biotechnology, South Asian University, New Delhi-110021, India
| | - Abhishek Singh Rathore
- Faculty of Life Sciences and Biotechnology, South Asian University, New Delhi-110021, India
| | - Md Fahim Khalid
- Faculty of Life Sciences and Biotechnology, South Asian University, New Delhi-110021, India
| | - Rinkoo Devi Gupta
- Faculty of Life Sciences and Biotechnology, South Asian University, New Delhi-110021, India.
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14
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Badar N, Ikram A, Salman M, Alam MM, Umair M, Arshad Y, Mushtaq N, Mirza HA, Ahad A, Farooq U, Yasin MT, Qazi J. Chikungunya virus: Molecular epidemiology of nonstructural proteins in Pakistan. PLoS One 2021; 16:e0260424. [PMID: 34941888 PMCID: PMC8699639 DOI: 10.1371/journal.pone.0260424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 11/09/2021] [Indexed: 11/18/2022] Open
Abstract
Chikungunya virus (CHIKV) is considered a public health problem due to its rapid spread and high morbidity. In 2016-2017 an outbreak of CHIKV was occurred in Pakistan but the data regarding the genomic diversity of CHIKV was not reported. Hence, the current study aimed to determine the genetic diversity of CHIKVs in Pakistan. A cross sectional study was carried out using sera of infected CHIKV patients (n = 1549) during the outbreak in Pakistan (2016-2018). Nucleotide sequencing of non-structural genes of CHIKV from eight isolates were performed followed by phylogenetic analysis using Bayesian method. Phylogenetic analysis suggested that the Pakistani CHIKV strains belonged to Indian Ocean Lineage (IOL) of genotype ECSA and C1.3a clade. Furthermore, the Pakistani isolates showed several key mutations (nsP2-H130Y, nsP2-E145D, nsP4-S55N and nsP4- R85G) corresponding to mutations reported in 2016 Indian strains of CHIKV. The molecular analysis revealed high evolutionary potential of CHIKV strains as well as better understanding of enhanced virulence and pathogenesis of this outbreak. The study highlights the need to continue surveillance in order to understand viral diversity over time and to devise preventive measures to limit diseases transmission in the region.
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Affiliation(s)
- Nazish Badar
- Department of Biotechnology, Quaid-I-Azam University, Islamabad, Pakistan
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Aamer Ikram
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Muhammad Salman
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Muhammad Masroor Alam
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Massab Umair
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Yasir Arshad
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Nighat Mushtaq
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Hamza Ahmad Mirza
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Abdul Ahad
- Department of Virology, National Institute of Health, Chak Shahzad, Islamabad, Pakistan
| | - Umer Farooq
- National Agricultural Research Center, Chak Shahzad, Islamabad, Pakistan
| | | | - Javaria Qazi
- Department of Biotechnology, Quaid-I-Azam University, Islamabad, Pakistan
- * E-mail:
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15
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Ortiz DI, Piche-Ovares M, Romero-Vega LM, Wagman J, Troyo A. The Impact of Deforestation, Urbanization, and Changing Land Use Patterns on the Ecology of Mosquito and Tick-Borne Diseases in Central America. INSECTS 2021; 13:20. [PMID: 35055864 PMCID: PMC8781098 DOI: 10.3390/insects13010020] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/13/2021] [Accepted: 12/16/2021] [Indexed: 11/29/2022]
Abstract
Central America is a unique geographical region that connects North and South America, enclosed by the Caribbean Sea to the East, and the Pacific Ocean to the West. This region, encompassing Belize, Costa Rica, Guatemala, El Salvador, Honduras, Panama, and Nicaragua, is highly vulnerable to the emergence or resurgence of mosquito-borne and tick-borne diseases due to a combination of key ecological and socioeconomic determinants acting together, often in a synergistic fashion. Of particular interest are the effects of land use changes, such as deforestation-driven urbanization and forest degradation, on the incidence and prevalence of these diseases, which are not well understood. In recent years, parts of Central America have experienced social and economic improvements; however, the region still faces major challenges in developing effective strategies and significant investments in public health infrastructure to prevent and control these diseases. In this article, we review the current knowledge and potential impacts of deforestation, urbanization, and other land use changes on mosquito-borne and tick-borne disease transmission in Central America and how these anthropogenic drivers could affect the risk for disease emergence and resurgence in the region. These issues are addressed in the context of other interconnected environmental and social challenges.
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Affiliation(s)
- Diana I. Ortiz
- Biology Program, Westminster College, New Wilmington, PA 16172, USA
| | - Marta Piche-Ovares
- Laboratorio de Virología, Centro de Investigación en Enfermedades Tropicales (CIET), Universidad de Costa Rica, San José 11501, Costa Rica;
- Departamento de Virología, Escuela de Medicina Veterinaria, Universidad Nacional, Heredia 40104, Costa Rica
| | - Luis M. Romero-Vega
- Departamento de Patología, Escuela de Medicina Veterinaria, Universidad Nacional, Heredia 40104, Costa Rica;
- Laboratorio de Investigación en Vectores (LIVe), Centro de Investigación en Enfermedades Tropicales (CIET), Universidad de Costa Rica, San José 11501, Costa Rica;
| | - Joseph Wagman
- Malaria and Neglected Tropical Diseases Program, Center for Malaria Control and Elimination, PATH, Washington, DC 20001, USA;
| | - Adriana Troyo
- Laboratorio de Investigación en Vectores (LIVe), Centro de Investigación en Enfermedades Tropicales (CIET), Universidad de Costa Rica, San José 11501, Costa Rica;
- Departamento de Parasitología, Facultad de Microbiología, Universidad de Costa Rica, San José 11501, Costa Rica
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16
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Paradkar PN, Sahasrabudhe PR, Ghag Sawant M, Mukherjee S, Blasdell KR. Towards Integrated Management of Dengue in Mumbai. Viruses 2021; 13:2436. [PMID: 34960705 PMCID: PMC8703503 DOI: 10.3390/v13122436] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 11/30/2021] [Accepted: 12/01/2021] [Indexed: 12/15/2022] Open
Abstract
With increasing urbanisation, the dengue disease burden is on the rise in India, especially in large cities such as Mumbai. Current dengue surveillance in Mumbai includes municipal corporation carrying out specific activities to reduce mosquito breeding sites and the use of insecticides to suppress the adult mosquito populations. Clinical cases remain either underreported or misreported due to the restriction to government clinics, missing the large private health care sector. There is a need for an integrated approach to manage dengue outbreaks in Mumbai. There are various novel strategies available for use that can be utilised to improve disease detection, mosquito surveillance, and control of mosquito-borne diseases. These novel technologies are discussed in this manuscript. Given the complex ecosystem of mosquito-borne diseases in Mumbai, integrating data obtained from these technologies would support the ongoing mosquito control measures in Mumbai.
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Affiliation(s)
- Prasad N. Paradkar
- CSIRO Health & Biosecurity, Australian Centre for Disease Preparedness, 5 Portarlington Road, Geelong 3220, Australia;
| | | | - Mrunal Ghag Sawant
- Department of Zoonosis, Haffkine Institute for Training Research and Testing, Parel, Mumbai 400012, India;
| | - Sandeepan Mukherjee
- Department of Virology, Haffkine Institute for Training Research and Testing, Parel, Mumbai 400012, India;
| | - Kim R. Blasdell
- CSIRO Health & Biosecurity, Australian Centre for Disease Preparedness, 5 Portarlington Road, Geelong 3220, Australia;
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17
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Zhang L, Zhao L, Zhang Z, Hong W, Wang J, Qiu S, Yang H, Gan M, Sun J, Zhao J, Wang Y, Zhao J, Zhang F. Genetic and pathogenicity diversity of dengue virus type 2 strains circulating in Guangdong, China. BIOSAFETY AND HEALTH 2021. [DOI: 10.1016/j.bsheal.2021.08.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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18
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Alfsnes K, Eldholm V, Gaunt MW, de Lamballerie X, Gould EA, Pettersson JHO. Tracing and tracking the emergence, epidemiology and dispersal of dengue virus to Africa during the 20th century. One Health 2021; 13:100337. [PMID: 34746356 PMCID: PMC8551533 DOI: 10.1016/j.onehlt.2021.100337] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 10/15/2021] [Accepted: 10/15/2021] [Indexed: 12/02/2022] Open
Abstract
The four mosquito-borne dengue virus serotypes (DENV1–DENV4) cause a high burden of disease throughout the tropical and sub-tropical regions of the world. Nevertheless, their precise epidemiological history in Africa, including when and where they originated and were distributed during the 20th century, remains unclear stressing the need for One Health focused research. Accordingly, we conducted a time-scaled molecular epidemiological reconstruction using publicly available and newly sequenced dengue virus genomes of African origin representing all four serotypes to deduce the most likely temporal and spatial transmission routes of each DENV serotype from their ancestral regions to, within and from Africa. Our analyses suggest that during the 20th century, serotypes DENV1–DENV3 were introduced to Africa from South East Asia on multiple occasions. The earliest evidence recorded indicates introduction of DENV2 during the early-1940s and of DENV1 during the mid-1940s to Western Africa from South East Asia. The analysis also implies an early introduction of DENV4 during the mid-1940s to Western Africa, alongside DENV1, probably originating in South East Asia. Establishment of DENV3 in Africa appears to have occurred later in the 1960s, apparently originating from South East Asia. However, with the re-establishment of DENV in the Americas, following the cessation of the PAHO mosquito control programme during the mid-20th century, evidence of introductions of DENV1 and DENV2 from the Americas to Western Africa was also observed. The data also identify intra-regional circulation of DENV, but also inter-regional dispersal of all four serotypes within Africa, which has led to a high degree of geographical overlap among serotypes. It is also noteworthy that DENV from both Eastern and Western Africa, have been introduced into Central Africa but there is no support for the converse relationship. For serotypes DENV1–DENV3, we observed probable exports from within established African DENV clusters (≥2 sequences) primarily to Eastern and Southern Asia. Collectively, our findings support the view that all DENV serotypes, apart from DENV4, have been introduced on multiple occasions to Africa, primarily originating from South East Asia, and subsequently to neighbouring regions within Africa.
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Affiliation(s)
- Kristian Alfsnes
- Infectious Disease Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Vegard Eldholm
- Infectious Disease Control and Environmental Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Michael W Gaunt
- London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, United Kingdom
| | - Xavier de Lamballerie
- UMR "Unité des Virus Emergents", Aix-Marseille Université-IRD 190-Inserm 1207-IHU Méditerranée Infection, Marseille, France.,APHM Public Hospitals of Marseille, Institut Hospitalo-Universitaire Méditerranée Infection, Marseille, France
| | - Ernest A Gould
- UMR "Unité des Virus Emergents", Aix-Marseille Université-IRD 190-Inserm 1207-IHU Méditerranée Infection, Marseille, France
| | - John H-O Pettersson
- Zoonosis Science Center, Department of Medical Biochemistry and Microbiology, Uppsala University, Sweden.,Public Health Agency of Sweden, Solna, Sweden.,Sydney Institute for Infectious Diseases, School of Life and Environmental Sciences and School of Medical Sciences, University of Sydney, Sydney, Australia
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19
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Nadugala MN, Jeewandara C, Jadi RS, Malavige GN, de Silva AM, Premaratne PH, Goonasekara CL. Natural immunogenic properties of bioinformatically predicted linear B-cell epitopes of dengue envelope and pre-membrane proteins. BMC Immunol 2021; 22:71. [PMID: 34732126 PMCID: PMC8567598 DOI: 10.1186/s12865-021-00462-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2021] [Accepted: 09/29/2021] [Indexed: 11/18/2022] Open
Abstract
Background The natural antibody responses to B-cell epitopes from dengue structural proteins were assessed using immune sera from people having well-defined past dengue infections with one of the four serotypes. Method Based on an immune-computational analysis previously conducted, nineteen epitopes from the envelope (E) and eight epitopes from pre-membrane (prM), which were more than 50% conserved across all the four DENV serotypes, were selected. Peptides to represent these B-cell epitopes were obtained from commercially available arrays, and were subjected to enzyme linked immunosorbent assay with sera obtained from dengue seropositive healthy volunteers (DENV1 n = 12: DENV2 n = 12: DENV3 n = 12 and DENV4 n = 12), and 10 dengue seronegative healthy volunteers from Sri Lanka. The cut-off value for the positive antibody response was set by taking the mean response of a peptide to the negative sera plus three standard deviations. The peptides (N = 7) showing the broad immune responses were used to generate antibodies in three mice (Balb/c) batches. The mice antisera were then subjected to microneutralization assays against all the four DENV serotypes. An EC50 viral neutralization ≥ 40 times the serum dilution was considered as neutralizing. Results Five of the E-peptide and two prM peptides were recognised by most individuls exposed to infections with each of the four serotypes, showing a serotype cross-reactive broad antibody response. The mice immune sera against the peptides representing the five E protein epitopes neutralized all the four DENV serotypes. Two of these five epitopes are from the Domain II, whereas one of them includes the whole bc-loop region. Conclusion The antibody responses of highly conserved epitopes across the serotypes, were broadly responsive with sera of all four DENV serotypes collected from individuals infected with only one DENV serotype. Weakly conserved epitopes showed rather specific antibody responses dominated by one or few serotypes. Supplementary Information The online version contains supplementary material available at 10.1186/s12865-021-00462-4.
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Affiliation(s)
- Mahesha N Nadugala
- Faculty of Medicine, General Sir John Kotelawala Defence University, Ratmalana, Sri Lanka
| | - Chandima Jeewandara
- Allergy Immunology and Cell Biology Unit, University of Sri Jayewardanapura, Gangodawila, Sri Lanka
| | - Ramesh S Jadi
- Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Gathsaurie N Malavige
- Centre for Dengue Research, University of Sri Jayawardanapura, Gangodawila, Sri Lanka
| | - Aravinda M de Silva
- Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Prasad H Premaratne
- Faculty of Medicine, General Sir John Kotelawala Defence University, Ratmalana, Sri Lanka
| | - Charitha L Goonasekara
- Faculty of Medicine, General Sir John Kotelawala Defence University, Ratmalana, Sri Lanka.
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20
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Fibriansah G, Lim XN, Lok SM. Morphological Diversity and Dynamics of Dengue Virus Affecting Antigenicity. Viruses 2021; 13:v13081446. [PMID: 34452312 PMCID: PMC8402850 DOI: 10.3390/v13081446] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2021] [Revised: 07/15/2021] [Accepted: 07/21/2021] [Indexed: 01/30/2023] Open
Abstract
The four serotypes of the mature dengue virus can display different morphologies, including the compact spherical, the bumpy spherical and the non-spherical clubshape morphologies. In addition, the maturation process of dengue virus is inefficient and therefore some partially immature dengue virus particles have been observed and they are infectious. All these viral particles have different antigenicity profiles and thus may affect the type of the elicited antibodies during an immune response. Understanding the molecular determinants and environmental conditions (e.g., temperature) in inducing morphological changes in the virus and how potent antibodies interact with these particles is important for designing effective therapeutics or vaccines. Several techniques, including cryoEM, site-directed mutagenesis, hydrogen-deuterium exchange mass spectrometry, time-resolve fluorescence resonance energy transfer, and molecular dynamic simulation, have been performed to investigate the structural changes. This review describes all known morphological variants of DENV discovered thus far, their surface protein dynamics and the key residues or interactions that play important roles in the structural changes.
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Affiliation(s)
- Guntur Fibriansah
- Programme in Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore 169857, Singapore; (G.F.); (X.-N.L.)
- Centre for BioImaging Sciences, Department of Biological Sciences, National University of Singapore, Singapore 117557, Singapore
| | - Xin-Ni Lim
- Programme in Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore 169857, Singapore; (G.F.); (X.-N.L.)
- Centre for BioImaging Sciences, Department of Biological Sciences, National University of Singapore, Singapore 117557, Singapore
| | - Shee-Mei Lok
- Programme in Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore 169857, Singapore; (G.F.); (X.-N.L.)
- Centre for BioImaging Sciences, Department of Biological Sciences, National University of Singapore, Singapore 117557, Singapore
- Correspondence:
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21
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Novelo M, Audsley MD, McGraw EA. The effects of DENV serotype competition and co-infection on viral kinetics in Wolbachia-infected and uninfected Aedes aegypti mosquitoes. Parasit Vectors 2021; 14:314. [PMID: 34108021 PMCID: PMC8190863 DOI: 10.1186/s13071-021-04816-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Accepted: 05/29/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The Aedes aegypti mosquito is responsible for the transmission of several medically important arthropod-borne viruses, including multiple serotypes of dengue virus (DENV-1, -2, -3, and -4). Competition within the mosquito between DENV serotypes can affect viral infection dynamics, modulating the transmission potential of the pathogen. Vector control remains the main method for limiting dengue fever. The insect endosymbiont Wolbachia pipientis is currently being trialed in field releases globally as a means of biological control because it reduces virus replication inside the mosquito. It is not clear how co-infection between DENV serotypes in the same mosquito might alter the pathogen-blocking phenotype elicited by Wolbachia in Ae. aegypti. METHODS Five- to 7-day-old female Ae. aegypti from two lines, namely, with (wMel) and without Wolbachia infection (WT), were fed virus-laden blood through an artificial membrane with either a mix of DENV-2 and DENV-3 or the same DENV serotypes singly. Mosquitoes were subsequently incubated inside environmental chambers and collected on the following days post-infection: 3, 4, 5, 7, 8, 9, 11, 12, and 13. Midgut, carcass, and salivary glands were collected from each mosquito at each timepoint and individually analyzed to determine the percentage of DENV infection and viral RNA load via RT-qPCR. RESULTS We saw that for WT mosquitoes DENV-3 grew to higher viral RNA loads across multiple tissues when co-infected with DENV-2 than when it was in a mono-infection. Additionally, we saw a strong pathogen-blocking phenotype in wMel mosquitoes independent of co-infection status. CONCLUSION In this study, we demonstrated that the wMel mosquito line is capable of blocking DENV serotype co-infection in a systemic way across the mosquito body. Moreover, we showed that for WT mosquitoes, serotype co-infection can affect infection frequency in a tissue- and time-specific manner and that both viruses have the potential of being transmitted simultaneously. Our findings suggest that the long-term efficacy of Wolbachia pathogen blocking is not compromised by arthropod-borne virus co-infection.
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Affiliation(s)
- M Novelo
- School of Biological Sciences, Monash University, Melbourne, VIC, 3800, Australia
- Center for Infectious Disease Dynamics, Department of Entomology, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 16802, USA
| | - M D Audsley
- School of Biological Sciences, Monash University, Melbourne, VIC, 3800, Australia
| | - E A McGraw
- School of Biological Sciences, Monash University, Melbourne, VIC, 3800, Australia.
- Center for Infectious Disease Dynamics, Department of Entomology, The Huck Institutes of the Life Sciences, The Pennsylvania State University, University Park, PA, 16802, USA.
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22
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Davis C, Murphy AK, Bambrick H, Devine GJ, Frentiu FD, Yakob L, Huang X, Li Z, Yang W, Williams G, Hu W. A regional suitable conditions index to forecast the impact of climate change on dengue vectorial capacity. ENVIRONMENTAL RESEARCH 2021; 195:110849. [PMID: 33561446 DOI: 10.1016/j.envres.2021.110849] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/22/2020] [Accepted: 02/02/2021] [Indexed: 06/12/2023]
Abstract
BACKGROUND The mosquitoes Aedes aegypti and Ae. albopictus are the primary vectors of dengue virus, and their geographic distributions are predicted to expand further with economic development, and in response to climate change. We aimed to estimate the impact of future climate change on dengue transmission through the development of a Suitable Conditions Index (SCI), based on climatic variables known to support vectorial capacity. We calculated the SCI based on various climate change scenarios for six countries in the Asia-Pacific region (Australia, China, Indonesia, The Philippines, Thailand and Vietnam). METHODS Monthly raster climate data (temperature and precipitation) were collected for the period January 2005 to December 2018 along with projected climate estimates for the years 2030, 2050 and 2070 using Representative Concentration Pathway (RCP) 4·5, 6·0 and 8·5 emissions scenarios. We defined suitable temperature ranges for dengue transmission of between 17·05-34·61 °C for Ae. aegypti and 15·84-31·51 °C for Ae. albopictus and then developed a historical and predicted SCI based on weather variability to measure the expected geographic limits of dengue vectorial capacity. Historical and projected SCI values were compared through difference maps for the six countries. FINDINGS Comparing different emission scenarios across all countries, we found that most South East Asian countries showed either a stable pattern of high suitability, or a potential decline in suitability for both vectors from 2030 to 2070, with a declining pattern particularly evident for Ae. albopictus. Temperate areas of both China and Australia showed a less stable pattern, with both moderate increases and decreases in suitability for each vector in different regions between 2030 and 2070. INTERPRETATION The SCI will be a useful index for forecasting potential dengue risk distributions in response to climate change, and independently of the effects of human activity. When considered alongside additional correlates of infection such as human population density and socioeconomic development indicators, the SCI could be used to develop an early warning system for dengue transmission.
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Affiliation(s)
- Callan Davis
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
| | - Amanda K Murphy
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia; Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Hilary Bambrick
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia
| | - Gregor J Devine
- Mosquito Control Laboratory, QIMR Berghofer Medical Research Institute, Brisbane, Australia
| | - Francesca D Frentiu
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Laith Yakob
- Department of Disease Control, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
| | - Xiaodong Huang
- Centre for Immunology and Infection Control, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Zhongjie Li
- Division of Infectious Disease, Key Laboratory of Surveillance and Early Warning of Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Weizhong Yang
- Division of Infectious Disease, Key Laboratory of Surveillance and Early Warning of Infectious Disease, Chinese Center for Disease Control and Prevention, Beijing, China; School of Population Medicine & Public Health, Chinese Academy of Medical Sciences/Peking Union Medical College, Beijing, China
| | - Gail Williams
- School of Public Health, University of Queensland, Brisbane, Australia
| | - Wenbiao Hu
- School of Public Health and Social Work, Queensland University of Technology, Brisbane, Australia.
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Fibriansah G, Lim EXY, Marzinek JK, Ng TS, Tan JL, Huber RG, Lim XN, Chew VSY, Kostyuchenko VA, Shi J, Anand GS, Bond PJ, Crowe JE, Lok SM. Antibody affinity versus dengue morphology influences neutralization. PLoS Pathog 2021; 17:e1009331. [PMID: 33621239 PMCID: PMC7935256 DOI: 10.1371/journal.ppat.1009331] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Revised: 03/05/2021] [Accepted: 01/25/2021] [Indexed: 12/23/2022] Open
Abstract
Different strains within a dengue serotype (DENV1-4) can have smooth, or “bumpy” surface morphologies with different antigenic characteristics at average body temperature (37°C). We determined the neutralizing properties of a serotype cross-reactive human monoclonal antibody (HMAb) 1C19 for strains with differing morphologies within the DENV1 and DENV2 serotypes. We mapped the 1C19 epitope to E protein domain II by hydrogen deuterium exchange mass spectrometry, cryoEM and molecular dynamics simulations, revealing that this epitope is likely partially hidden on the virus surface. We showed the antibody has high affinity for binding to recombinant DENV1 E proteins compared to those of DENV2, consistent with its strong neutralizing activities for all DENV1 strains tested regardless of their morphologies. This finding suggests that the antibody could out-compete E-to-E interaction for binding to its epitope. In contrast, for DENV2, HMAb 1C19 can only neutralize when the epitope becomes exposed on the bumpy-surfaced particle. Although HMAb 1C19 is not a suitable therapeutic candidate, this study with HMAb 1C19 shows the importance of choosing a high-affinity antibody that could neutralize diverse dengue virus morphologies for therapeutic purposes. Dengue virus consists of four serotypes (DENV1-4) and there are different strains within a serotype. DENV can have smooth or bumpy surface morphologies at physiological body temperature of 37°C, depending on the strain. We have determined the cryoEM structures of a cross-reactive neutralizing human monoclonal antibody (HMAb) 1C19 in complex with strains of DENV1 and DENV2 that form either smooth or bumpy surface morphologies. We have mapped the epitope of HMAb 1C19 to E protein domain II and the epitope is likely partially hidden on the virus surface. We showed that the antibody has high affinity for binding to recombinant DENV1 E protein than to DENV2 E protein. This explains the strong neutralization activity for all DENV1 strains tested regardless of their morphologies at physiological temperature, whereas it can only neutralize DENV2 strain that exposes the epitope on the bumpy surface particles. These results suggest that high-affinity therapeutic antibodies could neutralize diverse dengue virus morphologies.
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Affiliation(s)
- Guntur Fibriansah
- Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore, Singapore
- Centre for BioImaging Sciences, National University of Singapore, Singapore, Singapore
| | - Elisa X. Y. Lim
- Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore, Singapore
- Centre for BioImaging Sciences, National University of Singapore, Singapore, Singapore
| | - Jan K. Marzinek
- Bioinformatics Institute, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
| | - Thiam-Seng Ng
- Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore, Singapore
- Centre for BioImaging Sciences, National University of Singapore, Singapore, Singapore
| | - Joanne L. Tan
- Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore, Singapore
- Centre for BioImaging Sciences, National University of Singapore, Singapore, Singapore
| | - Roland G. Huber
- Bioinformatics Institute, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
| | - Xin-Ni Lim
- Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore, Singapore
- Centre for BioImaging Sciences, National University of Singapore, Singapore, Singapore
| | - Valerie S. Y. Chew
- Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore, Singapore
- Centre for BioImaging Sciences, National University of Singapore, Singapore, Singapore
| | - Victor A. Kostyuchenko
- Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore, Singapore
- Centre for BioImaging Sciences, National University of Singapore, Singapore, Singapore
| | - Jian Shi
- Centre for BioImaging Sciences, National University of Singapore, Singapore, Singapore
| | - Ganesh S. Anand
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - Peter J. Bond
- Bioinformatics Institute, A*STAR (Agency for Science, Technology and Research), Singapore, Singapore
- Department of Biological Sciences, National University of Singapore, Singapore, Singapore
| | - James E. Crowe
- The Vanderbilt Vaccine Center, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
- Departments of Pediatrics and Pathology, Microbiology and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
- * E-mail: (JEC); (SML)
| | - Shee-Mei Lok
- Emerging Infectious Diseases, Duke–National University of Singapore Medical School, Singapore, Singapore
- Centre for BioImaging Sciences, National University of Singapore, Singapore, Singapore
- * E-mail: (JEC); (SML)
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Predicting mammalian hosts in which novel coronaviruses can be generated. Nat Commun 2021; 12:780. [PMID: 33594041 PMCID: PMC7887240 DOI: 10.1038/s41467-021-21034-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 01/08/2021] [Indexed: 12/23/2022] Open
Abstract
Novel pathogenic coronaviruses – such as SARS-CoV and probably SARS-CoV-2 – arise by homologous recombination between co-infecting viruses in a single cell. Identifying possible sources of novel coronaviruses therefore requires identifying hosts of multiple coronaviruses; however, most coronavirus-host interactions remain unknown. Here, by deploying a meta-ensemble of similarity learners from three complementary perspectives (viral, mammalian and network), we predict which mammals are hosts of multiple coronaviruses. We predict that there are 11.5-fold more coronavirus-host associations, over 30-fold more potential SARS-CoV-2 recombination hosts, and over 40-fold more host species with four or more different subgenera of coronaviruses than have been observed to date at >0.5 mean probability cut-off (2.4-, 4.25- and 9-fold, respectively, at >0.9821). Our results demonstrate the large underappreciation of the potential scale of novel coronavirus generation in wild and domesticated animals. We identify high-risk species for coronavirus surveillance. Homologous recombination between co-infecting coronaviruses can produce novel pathogens. Here, Wardeh et al. develop a machine learning approach to predict associations between mammals and multiple coronaviruses and hence estimate the potential for generation of novel coronaviruses by recombination.
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Parhizgari N, Piazak N, Mostafavi E. Vector-borne diseases in Iran: epidemiology and key challenges. Future Microbiol 2021; 16:51-69. [PMID: 33438476 DOI: 10.2217/fmb-2019-0306] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Vector-borne diseases have become a global health concern in recent decades as a result of global warming, globalization, growth in international trade and travel, use of insecticide and drug resistance. This review study addressed the key vector-borne diseases and their current status in Iran to emphasize the requirements for further research on vector-borne diseases. The dispersion patterns of these diseases differ in various regions. Some of them such as Crimean-Congo hemorrhagic fever, and Q fever are distributed all across Iran, whereas some others such as plague, leishmaniasis, tularemia, and malaria are restricted to specific areas. The high prevalence of vectors throughout the country necessitates enhancing the monitoring and surveillance of emerging and reemerging vector-borne diseases and their potential vectors.
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Affiliation(s)
- Najmeh Parhizgari
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.,Department of Epidemiology and Biostatistics, Research Centre for Emerging & Reemerging infectious diseases, Pasteur Institute of Iran, Tehran, Iran
| | - Norair Piazak
- Department of Parasitology, Pasteur Institute of Iran, Tehran, Iran
| | - Ehsan Mostafavi
- Department of Epidemiology and Biostatistics, Research Centre for Emerging & Reemerging infectious diseases, Pasteur Institute of Iran, Tehran, Iran.,National Reference Laboratory for Plague, Tularemia & Q fever, Research Centre for Emerging & Reemerging Infectious Diseases, Pasteur Institute of Iran, Akanlu, Kabudar Ahang, Hamadan, Iran
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26
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Pickering P, Hugo LE, Devine GJ, Aaskov JG, Liu W. Australian Aedes aegypti mosquitoes are susceptible to infection with a highly divergent and sylvatic strain of dengue virus type 2 but are unlikely to transmit it. Parasit Vectors 2020; 13:240. [PMID: 32393378 PMCID: PMC7212620 DOI: 10.1186/s13071-020-04091-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 04/17/2020] [Indexed: 11/10/2022] Open
Abstract
Background Humans are the primary hosts of dengue viruses (DENV). However, sylvatic cycles of transmission can occur among non-human primates and human encroachment into forested regions can be a source of emergence of new strains such as the highly divergent and sylvatic strain of DENV2, QML22, recovered from a dengue fever patient returning to Australia from Borneo. The objective of the present study was to evaluate the vector competence of Australian Aedes aegypti mosquitoes for this virus. Methods Four- to five-day-old mosquitoes from two strains of Ae. aegypti from Queensland, Australia, were fed a meal of sheep blood containing 108 50% cell culture infectious dose per ml (CCID50/ml) of either QML22 or an epidemic strain of DENV serotype 2 (QML16) isolated from a dengue fever patient in Australia in 2015. Mosquitoes were maintained at 28 °C, 75% relative humidity and sampled 7, 10 and 14 days post-infection (dpi). Live virions in mosquito bodies (abdomen/thorax), legs and wings and saliva expectorates from individual mosquitoes were quantified using a cell culture enzyme-linked immunosorbent assay (CCELISA) to determine infection, dissemination and transmission rates. Results The infection and dissemination rates of the sylvatic DENV2 strain, QML22, were significantly lower than that for QML16. While the titres of virus in the bodies of mosquitoes infected with either of these viruses were similar, titres in legs and wings were significantly lower in mosquitoes infected with QML22 at most time points although they reached similar levels by 14 dpi. QML16 was detected in 16% (n = 25) and 28% (n = 25) of saliva expectorates at 10 and 14 dpi, respectively. In contrast, no virus was detected in the saliva expectorates of QML22 infected mosquitoes. Conclusions Australia urban/peri-urban Ae. aegypti species are susceptible to infection by the sylvatic and highly divergent DENV 2 QML22 but replication of QML22 is attenuated relative to the contemporary strain, QML16. A salivary gland infection or escape barrier may be acting to prevent infection of saliva and would prevent onward transmission of this highly divergent virus in Australia.![]()
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Affiliation(s)
- Paul Pickering
- Australian Defence Force Malaria and Infectious Disease Institute, Brisbane, Australia
| | - Leon E Hugo
- Queensland Institute of Medical Research-Berghofer Medical Research Institute, Brisbane, Australia
| | - Gregor J Devine
- Queensland Institute of Medical Research-Berghofer Medical Research Institute, Brisbane, Australia
| | - John G Aaskov
- Australian Defence Force Malaria and Infectious Disease Institute, Brisbane, Australia.,Queensland University of Technology, Brisbane, Australia
| | - Wenjun Liu
- Australian Defence Force Malaria and Infectious Disease Institute, Brisbane, Australia.
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Incidence and epidemiological features of dengue in Sabah, Malaysia. PLoS Negl Trop Dis 2020; 14:e0007504. [PMID: 32392222 PMCID: PMC7241834 DOI: 10.1371/journal.pntd.0007504] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2019] [Revised: 05/21/2020] [Accepted: 12/19/2019] [Indexed: 12/22/2022] Open
Abstract
In South East Asia, dengue epidemics have increased in size and geographical distribution in recent years. We examined the spatiotemporal distribution and epidemiological characteristics of reported dengue cases in the predominantly rural state of Sabah, in Malaysian Borneo-an area where sylvatic and urban circulation of pathogens are known to intersect. Using a public health data set of routinely notified dengue cases in Sabah between 2010 and 2016, we described demographic and entomological risk factors, both before and after a 2014 change in the clinical case definition for the disease. Annual dengue incidence rates were spatially variable over the 7-year study period from 2010-2016 (state-wide mean annual incidence of 21 cases/100,000 people; range 5-42/100,000), but were highest in rural localities in the western districts of the state (Kuala Penyu, Nabawan, Tenom and Kota Marudu). Eastern districts exhibited lower overall dengue rates, although a high proportion of severe (haemorrhagic) dengue cases (44%) were focused in Sandakan and Tawau. Dengue incidence was highest for those aged between 10 and 29 years (24/100,000), and was slightly higher for males compared to females. Available vector surveillance data indicated that during large outbreaks in 2015 and 2016 the mosquito Aedes albopictus was more prevalent in both urban and rural households (House Index of 64%) than Ae. aegypti (15%). Demographic patterns remained unchanged both before and after the dengue case definition was changed; however, in the years following the change, reported case numbers increased substantially. Overall, these findings suggest that dengue outbreaks in Sabah are increasing in both urban and rural settings. Future studies to better understand the drivers of risk in specific age groups, genders and geographic locations, and to test the potential role of Ae. albopictus in transmission, may help target dengue prevention and control efforts.
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Hosseini S, Muñoz-Soto RB, Oliva-Ramírez J, Vázquez-Villegas P, Aghamohammadi N, Rodriguez-Garcia A, Martinez-Chapa SO. Latest Updates in Dengue Fever Therapeutics: Natural, Marine and Synthetic Drugs. Curr Med Chem 2020; 27:719-744. [DOI: 10.2174/0929867325666180629124709] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 05/25/2018] [Accepted: 06/01/2018] [Indexed: 11/22/2022]
Abstract
In this paper, we review the history of Dengue, the mechanism of infection, the
molecular characteristics and components of Dengue, the mechanism of entry to the target
cells, cyclization of the genome and replication process, as well as translation of the proteins
for virus assembly. The major emphasis of this work is on natural products and plant extracts,
which were used for as palliative or adjuvant treatment of Dengue. This review article also
summarizes the latest findings in regards to the marine products as effective drugs to target
different symptoms of Dengue. Furthermore, an update on synthetic drugs for treating Dengue
is provided in this review. As a novel alternative, we describe monoclonal antibody therapy
for Dengue management and treatment.
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Affiliation(s)
- Samira Hosseini
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey, N.L. 64849, Mexico
| | - Rodrigo B. Muñoz-Soto
- Tecnologico de Monterrey, Campus Ciudad de México, Escuela de Ingeniería y Ciencias, Calle del Puente 222, Mexico City, Mexico
| | - Jacqueline Oliva-Ramírez
- Tecnologico de Monterrey, Escuela de Ingenieria y Ciencias, Ave. Lago de Guadalupe Km 3.5, Cd Lopez Mateos, Atizapan, Estado de Mexico, Mexico
| | | | - Nasrin Aghamohammadi
- Centre for Occupational and Environmental Health, Department of Social and Preventive Medicine, Faculty of Medicine, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Aida Rodriguez-Garcia
- Universidad Autonoma de Nuevo Leon, Facultad de Ciencias Biologicas, Instituto de Biotecnología. Ave. Pedro de Alba S/N, Ciudad Universitaria, San Nicolás de los Garza, N.L. 66455, Mexico
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Human Tibroviruses: Commensals or Lethal Pathogens? Viruses 2020; 12:v12030252. [PMID: 32106547 PMCID: PMC7150972 DOI: 10.3390/v12030252] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 02/21/2020] [Accepted: 02/21/2020] [Indexed: 12/16/2022] Open
Abstract
Rhabdoviruses are a large and ecologically diverse family of negative-sense RNA viruses (Mononegavirales: Rhabdoviridae). These viruses are capable of infecting an unexpectedly wide variety of plants, vertebrates, and invertebrates distributed over all human-inhabited continents. However, only a few rhabdoviruses are known to infect humans: a ledantevirus (Le Dantec virus), several lyssaviruses (in particular, rabies virus), and several vesiculoviruses (e.g., Chandipura virus, vesicular stomatitis Indiana virus). Recently, several novel rhabdoviruses have been discovered in the blood of both healthy and severely ill individuals living in Central and Western Africa. These viruses—Bas-Congo virus, Ekpoma virus 1, and Ekpoma virus 2—are members of the little-understood rhabdoviral genus Tibrovirus. Other than the basic genomic architecture, tibroviruses bear little resemblance to well-studied rhabdoviruses such as rabies virus and vesicular stomatitis Indiana virus. These three human tibroviruses are quite divergent from each other, and each of them clusters closely with tibroviruses currently known only from biting midges or healthy cattle. Seroprevalence studies suggest that human tibrovirus infections may be common but are almost entirely unrecognized. The pathogenic potential of this diverse group of viruses remains unknown. Although certain tibroviruses may be benign and well-adapted to humans, others could be newly emerging and produce serious disease. Here, we review the current knowledge of tibroviruses and argue that assessing their impact on human health should be an urgent priority.
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Endy TP. Viral Febrile Illnesses and Emerging Pathogens. HUNTER'S TROPICAL MEDICINE AND EMERGING INFECTIOUS DISEASES 2020. [PMCID: PMC7151808 DOI: 10.1016/b978-0-323-55512-8.00036-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Emerging or emerged diseases and viral pathogens are responsible historically and currently for large epidemics, global pandemics, and significant morbidity and mortality. Our civilization will continue to face the emergence of new pathogens and viruses: viruses will continue to evolve and adapt to new environments at a high rate; our population continues to grow through birth rate, land development, and migration; climate change will continue to increase the vector burden and spread and change the migratory pattern of animals; and our societal mobility will continue to increase through rapid transportation. The clinical evaluation of the febrile patient with a potential emerging viral pathogen involves documenting the likelihood for an infection by a detailed travel history, calculation of an incubation time by exposure, and an understanding of the disease progression though the clinical illness, which drives the differential diagnosis and the type of diagnostics ordered. Ultimately, the proper identification and diagnosis of a patient with a viral febrile illness due to an emerging pathogen will elicit the appropriate precautions to protect health care providers and communities, deliver appropriate therapeutic interventions, and initiate a targeted public health response. The majority of emerging diseases are caused by viruses, with many that are transmitted by insect vectors or are zoonotic. RNA viruses in particular have high mutation rates and can evolve rapidly in new and changing environments. This, in combination with societal factors, climate change, and rapid travel, has increased the number of epidemics from emerging pathogens in the last several decades. Understanding the travel history, incubation time of potential viruses, and the clinical presentation by illness day is essential in making the right diagnosis and identifying the infecting virus.
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Travelling arboviruses: A historical perspective. Travel Med Infect Dis 2019; 31:101471. [DOI: 10.1016/j.tmaid.2019.101471] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 08/26/2019] [Indexed: 11/24/2022]
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Abstract
This is a selective review of recent publications on dengue clinical features, epidemiology, pathogenesis, and vaccine development placed in a context of observations made over the past half century. Four dengue viruses (DENVs) are transmitted by urban cycle mosquitoes causing diseases whose nature and severity are influenced by interacting factors such as virus, age, immune status of the host, and human genetic variability. A phenomenon that controls the kinetics of DENV infection, antibody-dependent enhancement, best explains the correlation of the vascular permeability syndrome with second heterotypic DENV infections and infection in the presence of passively acquired antibodies. Based on growing evidence in vivo and in vitro, the tissue-damaging DENV non-structural protein 1 (NS1) is responsible for most of the pathophysiological features of severe dengue. This review considers the contribution of hemophagocytic histiocytosis syndrome to cases of severe dengue, the role of movement of humans in dengue epidemiology, and modeling and planning control programs and describes a country-wide survey for dengue infections in Bangladesh and efforts to learn what controls the clinical outcome of dengue infections. Progress and problems with three tetravalent live-attenuated vaccines are reviewed. Several research mysteries remain: why is the risk of severe disease during second heterotypic DENV infection so low, why is the onset of vascular permeability correlated with defervescence, and what are the crucial components of protective immunity?
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Affiliation(s)
- Scott Halstead
- Emeritus Professor, Department of Preventive Medicine and Biostatistics, Uniformed Services University of the Health Sciences, Bethesda, MD, 20814, USA
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Assessing the Potential Interactions between Cellular miRNA and Arboviral Genomic RNA in the Yellow Fever Mosquito, Aedes aegypti. Viruses 2019; 11:v11060540. [PMID: 31185697 PMCID: PMC6631873 DOI: 10.3390/v11060540] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Revised: 06/04/2019] [Accepted: 06/05/2019] [Indexed: 01/10/2023] Open
Abstract
Although the role of exogenous small interfering RNA (siRNA) and P-element induced wimpy testis (PIWI)-interacting RNA (piRNA) pathways in mosquito antiviral immunity is increasingly better understood, there is still little knowledge regarding the role of mosquito cellular microRNA (miRNA). Identifying direct interactions between the mosquito miRNAs and the RNA genome of arboviruses and choosing the relevant miRNA candidates to explore resulting antiviral mechanisms are critical. Here, we carried out genomic analyses to identify Aedes aegypti miRNAs that potentially interact with various lineages and genotypes of chikungunya, dengue, and Zika viruses. By using prediction tools with distinct algorithms, several miRNA binding sites were commonly found within different genotypes/and or lineages of each arbovirus. We further analyzed those miRNAs that could target more than one arbovirus, required a low energy threshold to form miRNA-viralRNA (vRNA) complexes, and predicted potential RNA structures using RNAhybrid software. We predicted miRNA candidates that might participate in regulating arboviral replication in Ae. aegypti. Even without any experimental validation, which should be done as a next step, this study can shed further light on the role of miRNA in mosquito innate immunity and targets for future studies.
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Hoyos-López R, Atencia-Pineda MC, Gallego-Gómez JC. Phylogenetic analysis of Dengue-2 serotypes circulating in mangroves in Northern Cordoba, Colombia. Rev Soc Bras Med Trop 2019; 52:e20190060. [PMID: 31188919 DOI: 10.1590/0037-8682-0060-2019] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 03/21/2019] [Indexed: 11/22/2022] Open
Abstract
INTRODUCTION In this study, we aimed to identify DENV-2 subtypes in Aedes aegypti pools collected between 2011 and 2017 in a rural area of Northern Cordoba, Colombia ("La Balsa"). METHODS RT-PCR was performed to analyze the capsid/pre-membrane region (C-PrM). Sequencing and phylogenetic bayesian inference using reference DENV-2 sequences were performed. RESULTS Twelve pools that tested positive for DENV-2 were characterized based on the C-PrM region and grouped under the Asian/American clade. CONCLUSIONS This study is the first to report the DENV-2 Asian-American subtype in a rural area of Cordoba region, which is associated with severe dengue and local epidemics.
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Affiliation(s)
- Richard Hoyos-López
- Grupo de Investigación en Enfermedades Tropicales y Resistencia Bacteriana, Universidad del Sinú, Facultad de Ciencias de la Salud, Montería-Córdoba, Colombia
| | - Maria Claudia Atencia-Pineda
- Grupo de Investigación en Enfermedades Tropicales y Resistencia Bacteriana, Universidad del Sinú, Facultad de Ciencias de la Salud, Montería-Córdoba, Colombia
| | - Juan Carlos Gallego-Gómez
- Molecular and Translational Medicine Group, Medical Research Institute, Faculty of Medicina, Universidad de Antioquia, Medellín, Colombia
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Lyski ZL, Messer WB. Approaches to Interrogating the Human Memory B-Cell and Memory-Derived Antibody Repertoire Following Dengue Virus Infection. Front Immunol 2019; 10:1276. [PMID: 31244836 PMCID: PMC6562360 DOI: 10.3389/fimmu.2019.01276] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Accepted: 05/20/2019] [Indexed: 12/21/2022] Open
Abstract
Memory B-cells (MBCs) are potential antibody secreting immune cells that differentiate and mature following host exposure to a pathogen. Following differentiation, MBCs remain in peripheral circulation after recovery and are poised to secrete antigen-specific antibodies if and when they are re-exposed to their cognate antigen. Consequently, MBCs form the founder population and provide one of the first lines of pathogen-specific defense against reinfection. The role MBCs play is complicated for viruses that are heterologous, such as dengue virus (DENV), which exist as antigenically different serotypes. On second infection with a different serotype, MBCs from initial dengue infection rapidly proliferate and secrete antibodies: many of these MBC derived antibodies will be cross-reactive and weakly neutralizing, while some antibodies may recognize epitopes conserved across serotypes and have the capacity to broadly neutralize 2 or more serotypes. It is also possible that a new population of MBCs and antibodies specific for the second virus serotype need to arise for long-term broader immunity to develop. Methods to interrogate and track memory B cell responses are important for evaluating both natural immunity and vaccine response. However, the low abundance of MBCs for any specific pathogen makes it challenging to interrogate frequency, specificity, and breadth for the pathogen of interest. This review discusses current approaches that have been used to interrogate the memory B cell immune response against viral pathogens in general and DENV specifically. Including strengths, limitations, and future directions. Single-cell approaches could help uncover the DENV specific MBC antibody repertoire, and improved methods for isolating DENV specific monoclonal antibodies from human peripheral blood cells would allow for a functional analysis of the anti-DENV repertoire.
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Affiliation(s)
- Zoe L Lyski
- Department of Molecular Microbiology and Immunology, Oregon Health and Sciences University, Portland, OR, United States
| | - William B Messer
- Department of Molecular Microbiology and Immunology, Oregon Health and Sciences University, Portland, OR, United States
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36
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Failloux AB. [Mosquitoes as vectors of arboviruses: an endless story]. Biol Aujourdhui 2019; 212:89-99. [PMID: 30973138 DOI: 10.1051/jbio/2018026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Indexed: 11/14/2022]
Abstract
The recent emergence or re-emergence of vector-borne diseases (VBD) and, more specifically, VBD associated with arboviruses such as dengue, chikungunya, Zika or yellow fever are not new events. The globalization of trade and travels as well as the unplanned urbanization of many tropical and subtropical cities have created the conditions suitable for the establishment of vector mosquitoes offering opportunities for arbovirus introduction. This review describes the major arboviruses important for human health and their epidemic vectors, and the conditions leading to their emergence.
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Affiliation(s)
- Anna-Bella Failloux
- Institut Pasteur, Département de Virologie, Arbovirus et Insectes Vecteurs, 25 rue du Dr Roux, 75724 Paris Cedex 15, France
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First Reported Complete Genome Sequence of a Dengue Virus Serotype 4 Strain from Papua New Guinea. Microbiol Resour Announc 2018; 7:MRA01082-18. [PMID: 30533658 PMCID: PMC6256681 DOI: 10.1128/mra.01082-18] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 08/31/2018] [Indexed: 11/23/2022] Open
Abstract
A male patient in his 50s who traveled from Papua New Guinea (PNG) to Australia in 2016 was diagnosed with a dengue virus serotype 4 (DENV-4) infection, and the virus was isolated from his acute-phase serum. Here, we describe the first complete genome sequence of a DENV-4 strain from PNG. A male patient in his 50s who traveled from Papua New Guinea (PNG) to Australia in 2016 was diagnosed with a dengue virus serotype 4 (DENV-4) infection, and the virus was isolated from his acute-phase serum. Here, we describe the first complete genome sequence of a DENV-4 strain from PNG.
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Early Events in Japanese Encephalitis Virus Infection: Viral Entry. Pathogens 2018; 7:pathogens7030068. [PMID: 30104482 PMCID: PMC6161159 DOI: 10.3390/pathogens7030068] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 07/31/2018] [Accepted: 08/06/2018] [Indexed: 12/15/2022] Open
Abstract
Japanese encephalitis virus (JEV), a mosquito-borne zoonotic flavivirus, is an enveloped positive-strand RNA virus that can cause a spectrum of clinical manifestations, ranging from mild febrile illness to severe neuroinvasive disease. Today, several killed and live vaccines are available in different parts of the globe for use in humans to prevent JEV-induced diseases, yet no antivirals are available to treat JEV-associated diseases. Despite the progress made in vaccine research and development, JEV is still a major public health problem in southern, eastern, and southeastern Asia, as well as northern Oceania, with the potential to become an emerging global pathogen. In viral replication, the entry of JEV into the cell is the first step in a cascade of complex interactions between the virus and target cells that is required for the initiation, dissemination, and maintenance of infection. Because this step determines cell/tissue tropism and pathogenesis, it is a promising target for antiviral therapy. JEV entry is mediated by the viral glycoprotein E, which binds virions to the cell surface (attachment), delivers them to endosomes (endocytosis), and catalyzes the fusion between the viral and endosomal membranes (membrane fusion), followed by the release of the viral genome into the cytoplasm (uncoating). In this multistep process, a collection of host factors are involved. In this review, we summarize the current knowledge on the viral and cellular components involved in JEV entry into host cells, with an emphasis on the initial virus-host cell interactions on the cell surface.
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Koo C, Tien WP, Xu H, Ong J, Rajarethinam J, Lai YL, Ng LC, Hapuarachchi HC. Highly Selective Transmission Success of Dengue Virus Type 1 Lineages in a Dynamic Virus Population: An Evolutionary and Fitness Perspective. iScience 2018; 6:38-51. [PMID: 30240624 PMCID: PMC6137288 DOI: 10.1016/j.isci.2018.07.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2018] [Revised: 06/19/2018] [Accepted: 07/13/2018] [Indexed: 11/30/2022] Open
Abstract
Arbovirus transmission is modulated by host, vector, virus, and environmental factors. Even though viral fitness plays a salient role in host and vector adaptation, the transmission success of individual strains in a heterogeneous population may be stochastic. Our large-scale molecular epidemiological analyses of a dengue virus type 1 population revealed that only a subset of strains (16.7%; n = 6) were able to sustain transmission, despite the population being widely dispersed, dynamic, and heterogeneous. The overall dominance was variable even among the “established” lineages, albeit sharing comparable evolutionary characteristics and replication profiles. These findings indicated that virological parameters alone were unlikely to have a profound effect on the survival of viral lineages, suggesting an important role for non-viral factors in the transmission success of lineages. Our observations, therefore, emphasize the strategic importance of a holistic understanding of vector, human host, and viral factors in the control of vector-borne diseases. The sustained transmission of dengue virus 1 lineages is highly selective The overall dominance is variable even among the “established” lineages The lineage dominance is not merely determined by virus evolution and fitness The non-viral factors play an important role in the survival of virus lineages
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Affiliation(s)
- Carmen Koo
- Environmental Health Institute, National Environment Agency, 11, Biopolis Way, #06-05-08, Singapore 138667, Singapore
| | - Wei Ping Tien
- Environmental Health Institute, National Environment Agency, 11, Biopolis Way, #06-05-08, Singapore 138667, Singapore
| | - Helen Xu
- Environmental Health Institute, National Environment Agency, 11, Biopolis Way, #06-05-08, Singapore 138667, Singapore
| | - Janet Ong
- Environmental Health Institute, National Environment Agency, 11, Biopolis Way, #06-05-08, Singapore 138667, Singapore
| | - Jayanthi Rajarethinam
- Environmental Health Institute, National Environment Agency, 11, Biopolis Way, #06-05-08, Singapore 138667, Singapore
| | - Yee Ling Lai
- Environmental Health Institute, National Environment Agency, 11, Biopolis Way, #06-05-08, Singapore 138667, Singapore
| | - Lee-Ching Ng
- Environmental Health Institute, National Environment Agency, 11, Biopolis Way, #06-05-08, Singapore 138667, Singapore; School of Biological Sciences, Nanyang Technological University, 60 Nanyang Drive, Singapore 637551, Singapore
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40
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Pyke AT, Gunn W, Taylor C, Mackay IM, McMahon J, Jelley L, Waite B, May F. On the Home Front: Specialised Reference Testing for Dengue in the Australasian Region. Trop Med Infect Dis 2018; 3:E75. [PMID: 30274471 PMCID: PMC6161173 DOI: 10.3390/tropicalmed3030075] [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] [Received: 05/29/2018] [Revised: 06/29/2018] [Accepted: 07/10/2018] [Indexed: 11/30/2022] Open
Abstract
Reference laboratories are vital for disease control and interpreting the complexities and impact of emerging pathogens. The role of these centralized facilities extends beyond routine screening capabilities to provide rapid, specific, and accurate diagnoses, advanced data analysis, consultation services, and sophisticated disease surveillance and monitoring. Within the Australasian region, the Public Health Virology Laboratory (PHV), Forensic and Scientific Services, Department of Health, Queensland Government, Australia, and the Institute of Environmental Science and Research Limited (ESR), New Zealand (NZ) perform specialised reference testing and surveillance for dengue viruses (DENVs) and other emerging arthropod-borne viruses (arboviruses), including chikungunya virus (CHIKV) and Zika virus (ZIKV). With a focus on DENV, we review the reference testing performed by PHV (2005 to 2017) and ESR (2008 to 2017). We also describe how the evolution and expansion of reference-based methodologies and the adoption of new technologies have provided the critical elements of preparedness and early detection that complement frontline public health control efforts and limit the spread of arboviruses within Australasia.
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Affiliation(s)
- Alyssa T Pyke
- Public Health Virology Laboratory, Forensic and Scientific Services, Coopers Plains, QLD 4108, Australia.
| | - Wendy Gunn
- Institute of Environmental Science and Research Limited, Wallaceville, 5018 Upper Hutt, New Zealand.
| | - Carmel Taylor
- Public Health Virology Laboratory, Forensic and Scientific Services, Coopers Plains, QLD 4108, Australia.
| | - Ian M Mackay
- Public Health Virology Laboratory, Forensic and Scientific Services, Coopers Plains, QLD 4108, Australia.
- Child Health Research Centre, The University of Queensland, South Brisbane, QLD 4101, Australia.
| | - Jamie McMahon
- Public Health Virology Laboratory, Forensic and Scientific Services, Coopers Plains, QLD 4108, Australia.
| | - Lauren Jelley
- Institute of Environmental Science and Research Limited, Wallaceville, 5018 Upper Hutt, New Zealand.
| | - Ben Waite
- Institute of Environmental Science and Research Limited, Wallaceville, 5018 Upper Hutt, New Zealand.
| | - Fiona May
- Metro North Public Health Unit, Metro North Hospital and Health Service, Queensland Health, Windsor, QLD 4030, Australia.
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41
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Colonetti T, Rocha BVE, Grande AJ, Alexandre MCM, Dondossola ER, Madeira K, Rosa MI. Accuracy of immunoglobulin M and immunoglobulin A of saliva in early diagnosis of dengue: Systematic Review and Meta-analysis. AN ACAD BRAS CIENC 2018; 90:3147-3154. [PMID: 29947679 DOI: 10.1590/0001-3765201820170989] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2017] [Accepted: 04/04/2018] [Indexed: 11/22/2022] Open
Abstract
The objective of the study was to conduct a systematic review to synthesize the current evidence on the accuracy of IgM and IgA to early diagnosis the dengue virus. The review protocol was registered at PROSPERO (CRD 42015024808). We searched for studies in the following electronic database from 1990 to January 2018. The search identified 3507 studies. Five studies were included for quantitative analysis. Three studies included evaluations of salivary IgM provided a sensitivity of 86% and specificity of 93%. Two studies included evaluating of IgA salivary showed a combined sensitivity of 69% and a combined specificity of 98%. Despite the results found and the low methodological quality of the studies included in the meta-analysis it is still soon to claim that IgA is better than IgM to diagnosis Dengue.
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Affiliation(s)
- Tamy Colonetti
- Laboratório de Epidemiologia, Universidade do Extremo Sul Catarinense, Avenida Universitária, 1105, Bairro Universitário, 88806-000 Criciúma, SC, Brazil
| | - Belise V E Rocha
- Laboratório de Epidemiologia, Universidade do Extremo Sul Catarinense, Avenida Universitária, 1105, Bairro Universitário, 88806-000 Criciúma, SC, Brazil
| | - Antônio J Grande
- Laboratório de Epidemiologia, Universidade do Extremo Sul Catarinense, Avenida Universitária, 1105, Bairro Universitário, 88806-000 Criciúma, SC, Brazil
| | - Maria C M Alexandre
- Laboratório de Epidemiologia, Universidade do Extremo Sul Catarinense, Avenida Universitária, 1105, Bairro Universitário, 88806-000 Criciúma, SC, Brazil
| | - Eduardo R Dondossola
- Laboratório de Epidemiologia, Universidade do Extremo Sul Catarinense, Avenida Universitária, 1105, Bairro Universitário, 88806-000 Criciúma, SC, Brazil
| | - Kristian Madeira
- Laboratório de Epidemiologia, Universidade do Extremo Sul Catarinense, Avenida Universitária, 1105, Bairro Universitário, 88806-000 Criciúma, SC, Brazil
| | - Maria I Rosa
- Laboratório de Epidemiologia, Universidade do Extremo Sul Catarinense, Avenida Universitária, 1105, Bairro Universitário, 88806-000 Criciúma, SC, Brazil
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42
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Complete Genome Sequence of Dengue Virus Serotype 2, Asian/American Genotype, Isolated from the Urine of a Venezuelan Child with Hemorrhagic Fever in 2016. GENOME ANNOUNCEMENTS 2018; 6:6/24/e00529-18. [PMID: 29903824 PMCID: PMC6003737 DOI: 10.1128/genomea.00529-18] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The complete genome sequence was obtained for a Dengue virus 2 isolate from the urine of an 8-year-old girl who was hospitalized with dengue hemorrhagic fever in 2016 in Venezuela.
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43
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Dwivedi VD, Tripathi IP, Tripathi RC, Bharadwaj S, Mishra SK. Genomics, proteomics and evolution of dengue virus. Brief Funct Genomics 2018; 16:217-227. [PMID: 28073742 DOI: 10.1093/bfgp/elw040] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The genome of a pathogenic organism possesses a specific order of nucleotides that contains not only information about the synthesis and expression of proteomes, which are required for its growth and survival, but also about its evolution. Inhibition of any particular protein, which is required for the survival of that pathogenic organism, can be used as a potential therapeutic target for the development of effective drugs to treat its infections. In this review, the genomics, proteomics and evolution of dengue virus have been discussed, which will be helpful in better understanding of its origin, growth, survival and evolution, and may contribute toward development of new efficient anti-dengue drugs.
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44
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Röltgen K, Rose N, Ruggieri A, Warryn L, Scherr N, Pinho-Nascimento CA, Tamborrini M, Jaenisch T, Pluschke G. Development of Dengue Virus Serotype-Specific NS1 Capture Assays for the Rapid and Highly Sensitive Identification of the Infecting Serotype in Human Sera. THE JOURNAL OF IMMUNOLOGY 2018; 200:3857-3866. [PMID: 29661824 DOI: 10.4049/jimmunol.1701790] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Accepted: 03/26/2018] [Indexed: 12/29/2022]
Abstract
Dengue fever can be caused by one of four distinct dengue virus (DENV) serotypes that cocirculate in many parts of the world. Point of care serotype-specific nonstructural protein-1 (NS1) capture assays for the rapid serotyping of DENV in human sera would greatly support epidemiological surveillance and potentially also prognosis in individual patients. To ensure both serotype specificity and broad coverage of variants within serotypes, we have applied an innovative approach for the generation and selection of serotype-specific anti-NS1 mAbs. To elicit mAbs against conformational epitopes, NMRI mice were immunized with living HEK 293 transfectants expressing the native target Ags in multiple display on the cell surface. For each serotype, three different NS1 sequence variants were sequentially used for immunization of mice, hybridoma selection, and capture assay development, respectively. Selection of optimal combinations of capturing and detecting mAbs yielded highly sensitive and specific NS1 serotyping ELISAs (st-ELISAs) for the four serotypes. st-ELISA testing of 41 dengue patient sera showed a 100% concordance with the serotype determined by serotype-specific reverse transcriptase real-time quantitative PCR. The respective NS1 variants could be detected for ∼10 d after the onset of illness. Ab-dependent enhancement of DENV infections may be associated with a specific range of pre-existing anti-DENV serological Ab titers. Testing of patient sera with the developed st-ELISAs will not only be useful for epidemiological studies and surveillance, but it may also help to develop and validate assays that can distinguish protective versus enhancing Ab responses for risk assessment for the development of severe dengue disease in individual patients.
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Affiliation(s)
- Katharina Röltgen
- Molecular Immunology, Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland; .,University of Basel, 4001 Basel, Switzerland
| | - Natalie Rose
- Molecular Immunology, Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland.,University of Basel, 4001 Basel, Switzerland
| | - Alessia Ruggieri
- Department of Infectious Diseases, Molecular Virology, University of Heidelberg, 69120 Heidelberg, Germany
| | - Louisa Warryn
- Molecular Immunology, Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland.,University of Basel, 4001 Basel, Switzerland
| | - Nicole Scherr
- Molecular Immunology, Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland.,University of Basel, 4001 Basel, Switzerland
| | | | - Marco Tamborrini
- Molecular Immunology, Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland.,University of Basel, 4001 Basel, Switzerland
| | - Thomas Jaenisch
- Department of Infectious Diseases, Section Clinical Tropical Medicine, Heidelberg University Hospital, 69120 Heidelberg, Germany
| | - Gerd Pluschke
- Molecular Immunology, Swiss Tropical and Public Health Institute, 4002 Basel, Switzerland.,University of Basel, 4001 Basel, Switzerland
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45
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Lourenço J, Tennant W, Faria NR, Walker A, Gupta S, Recker M. Challenges in dengue research: A computational perspective. Evol Appl 2018; 11:516-533. [PMID: 29636803 PMCID: PMC5891037 DOI: 10.1111/eva.12554] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 09/08/2017] [Indexed: 01/12/2023] Open
Abstract
The dengue virus is now the most widespread arbovirus affecting human populations, causing significant economic and social impact in South America and South-East Asia. Increasing urbanization and globalization, coupled with insufficient resources for control, misguided policies or lack of political will, and expansion of its mosquito vectors are some of the reasons why interventions have so far failed to curb this major public health problem. Computational approaches have elucidated on dengue's population dynamics with the aim to provide not only a better understanding of the evolution and epidemiology of the virus but also robust intervention strategies. It is clear, however, that these have been insufficient to address key aspects of dengue's biology, many of which will play a crucial role for the success of future control programmes, including vaccination. Within a multiscale perspective on this biological system, with the aim of linking evolutionary, ecological and epidemiological thinking, as well as to expand on classic modelling assumptions, we here propose, discuss and exemplify a few major computational avenues-real-time computational analysis of genetic data, phylodynamic modelling frameworks, within-host model frameworks and GPU-accelerated computing. We argue that these emerging approaches should offer valuable research opportunities over the coming years, as previously applied and demonstrated in the context of other pathogens.
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Affiliation(s)
| | - Warren Tennant
- Centre for Mathematics and the EnvironmentUniversity of ExeterPenrynUK
| | | | | | | | - Mario Recker
- Centre for Mathematics and the EnvironmentUniversity of ExeterPenrynUK
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46
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Stabell AC, Meyerson NR, Gullberg RC, Gilchrist AR, Webb KJ, Old WM, Perera R, Sawyer SL. Dengue viruses cleave STING in humans but not in nonhuman primates, their presumed natural reservoir. eLife 2018; 7:31919. [PMID: 29557779 PMCID: PMC5860865 DOI: 10.7554/elife.31919] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2017] [Accepted: 02/08/2018] [Indexed: 12/25/2022] Open
Abstract
Human dengue viruses emerged from primate reservoirs, yet paradoxically dengue does not reach high titers in primate models. This presents a unique opportunity to examine the genetics of spillover versus reservoir hosts. The dengue virus 2 (DENV2) - encoded protease cleaves human STING, reducing type I interferon production and boosting viral titers in humans. We find that both human and sylvatic (reservoir) dengue viruses universally cleave human STING, but not the STING of primates implicated as reservoir species. The special ability of dengue to cleave STING is thus specific to humans and a few closely related ape species. Conversion of residues 78/79 to the human-encoded 'RG' renders all primate (and mouse) STINGs sensitive to viral cleavage. Dengue viruses may have evolved to increase viral titers in the dense and vast human population, while maintaining decreased titers and pathogenicity in the more rare animals that serve as their sustaining reservoir in nature.
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Affiliation(s)
- Alex C Stabell
- Department of Molecular, Cellular and Developmental Biology, University of Colorado Boulder, Boulder, United States
| | - Nicholas R Meyerson
- Department of Molecular, Cellular and Developmental Biology, University of Colorado Boulder, Boulder, United States
| | - Rebekah C Gullberg
- Arthropod-borne and Infectious Diseases Laboratory, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, United States
| | - Alison R Gilchrist
- Department of Molecular, Cellular and Developmental Biology, University of Colorado Boulder, Boulder, United States
| | - Kristofor J Webb
- Department of Molecular, Cellular and Developmental Biology, University of Colorado Boulder, Boulder, United States
| | - William M Old
- Department of Molecular, Cellular and Developmental Biology, University of Colorado Boulder, Boulder, United States
| | - Rushika Perera
- Arthropod-borne and Infectious Diseases Laboratory, Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, United States
| | - Sara L Sawyer
- Department of Molecular, Cellular and Developmental Biology, University of Colorado Boulder, Boulder, United States
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47
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Moore PR, van den Hurk AF, Mackenzie JS, Pyke AT. Dengue viruses in Papua New Guinea: evidence of endemicity and phylogenetic variation, including the evolution of new genetic lineages. Emerg Microbes Infect 2017; 6:e114. [PMID: 29259329 PMCID: PMC5750459 DOI: 10.1038/emi.2017.103] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Revised: 10/16/2017] [Accepted: 10/22/2017] [Indexed: 01/10/2023]
Abstract
Dengue is the most common cause of mosquito-borne viral disease in humans, and is endemic in more than 100 tropical and subtropical countries. Periodic outbreaks of dengue have been reported in Papua New Guinea (PNG), but there is only limited knowledge of its endemicity and disease burden. To help elucidate the status of the dengue viruses (DENVs) in PNG, we performed envelope (E) gene sequencing of DENV serotypes 1-4 (DENV 1-4) obtained from infected patients who traveled to Australia or from patients diagnosed during local DENV transmission events between 2001 and 2016. Phylogenetic analysis and comparison with globally available DENV sequences revealed new endemic PNG lineages for DENV 1-3 which have emerged within the last decade. We also identified another possible PNG lineage for DENV-4 from 2016. The DENV-1 and 3 PNG lineages were most closely related to recent lineages circulating on Pacific island nations while the DENV-2 lineage and putative DENV-4 PNG lineage were most similar to Indonesian sequences. This study has demonstrated for the first time the co-circulation of DENV 1-4 strains in PNG and provided molecular evidence of endemic DENV transmission. Our results provide an important platform for improved surveillance and monitoring of DENVs in PNG and broaden the global understanding of DENV genetic diversity.
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Affiliation(s)
- Peter R Moore
- Public Health Virology Laboratory, Forensic and Scientific Services, Coopers Plains, Queensland 4108, Australia
| | - Andrew F van den Hurk
- Public Health Virology Laboratory, Forensic and Scientific Services, Coopers Plains, Queensland 4108, Australia
| | - John S Mackenzie
- Faculty of Medical Sciences, Curtin University, Perth, Western Australia 6102, Australia
- Division of Microbiology and Infectious Diseases, PathWest, Nedlands, Western Australia 6909, Australia
| | - Alyssa T Pyke
- Public Health Virology Laboratory, Forensic and Scientific Services, Coopers Plains, Queensland 4108, Australia
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48
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Pelliccia S, Wu YH, Coluccia A, La Regina G, Tseng CK, Famiglini V, Masci D, Hiscott J, Lee JC, Silvestri R. Inhibition of dengue virus replication by novel inhibitors of RNA-dependent RNA polymerase and protease activities. J Enzyme Inhib Med Chem 2017; 32:1091-1101. [PMID: 28776445 PMCID: PMC6010079 DOI: 10.1080/14756366.2017.1355791] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 07/01/2017] [Accepted: 07/12/2017] [Indexed: 11/26/2022] Open
Abstract
Dengue virus (DENV) is the leading mosquito-transmitted viral infection in the world. With more than 390 million new infections annually, and up to 1 million clinical cases with severe disease manifestations, there continues to be a need to develop new antiviral agents against dengue infection. In addition, there is no approved anti-DENV agents for treating DENV-infected patients. In the present study, we identified new compounds with anti-DENV replication activity by targeting viral replication enzymes - NS5, RNA-dependent RNA polymerase (RdRp) and NS3 protease, using cell-based reporter assay. Subsequently, we performed an enzyme-based assay to clarify the action of these compounds against DENV RdRp or NS3 protease activity. Moreover, these compounds exhibited anti-DENV activity in vivo in the ICR-suckling DENV-infected mouse model. Combination drug treatment exhibited a synergistic inhibition of DENV replication. These results describe novel prototypical small anti-DENV molecules for further development through compound modification and provide potential antivirals for treating DENV infection and DENV-related diseases.
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Affiliation(s)
- Sveva Pelliccia
- Department of Drug Chemistry and Technologies, Sapienza University of Rome, Laboratory affiliated to Istituto Pasteur Italia – Fondazione Cenci Bolognetti, Roma, Italy
| | - Yu-Hsuan Wu
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Center of Infectious Disease and Signaling Research, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Antonio Coluccia
- Department of Drug Chemistry and Technologies, Sapienza University of Rome, Laboratory affiliated to Istituto Pasteur Italia – Fondazione Cenci Bolognetti, Roma, Italy
| | - Giuseppe La Regina
- Department of Drug Chemistry and Technologies, Sapienza University of Rome, Laboratory affiliated to Istituto Pasteur Italia – Fondazione Cenci Bolognetti, Roma, Italy
| | - Chin-Kai Tseng
- Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung University, Tainan, Taiwan
- Center of Infectious Disease and Signaling Research, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | - Valeria Famiglini
- Department of Drug Chemistry and Technologies, Sapienza University of Rome, Laboratory affiliated to Istituto Pasteur Italia – Fondazione Cenci Bolognetti, Roma, Italy
| | - Domiziana Masci
- Department of Drug Chemistry and Technologies, Sapienza University of Rome, Laboratory affiliated to Istituto Pasteur Italia – Fondazione Cenci Bolognetti, Roma, Italy
| | - John Hiscott
- Istituto Pasteur Italia – Fondazione Cenci Bolognetti, Roma, Italy
| | - Jin-Ching Lee
- Department of Biotechnology, College of Life Science, Kaohsiung Medical University, Kaohsiung, Taiwan
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung, Taiwan
- Research Center for Natural Products and Drug Development, Kaohsiung Medical University, Kaohsiung, Taiwan
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Romano Silvestri
- Department of Drug Chemistry and Technologies, Sapienza University of Rome, Laboratory affiliated to Istituto Pasteur Italia – Fondazione Cenci Bolognetti, Roma, Italy
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49
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Complete Genome Sequence of a Highly Divergent Dengue Virus Type 2 Strain, Imported into Australia from Sabah, Malaysia. GENOME ANNOUNCEMENTS 2017; 5:5/29/e00546-17. [PMID: 28729258 PMCID: PMC5522925 DOI: 10.1128/genomea.00546-17] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
In 2015, a female patient returning to Australia from Sabah, Malaysia, was diagnosed with a suspected sylvatic dengue virus type 2 (DENV-2) infection, becoming the second case of imported highly divergent dengue virus infection recorded in Australia. We describe here the complete genome sequencing of the DENV-2 strain isolated from this patient.
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50
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Gao B, Zhang J, Wang Y, Chen F, Zheng C, Xie L. Genomic Characterization of Travel-Associated Dengue Viruses Isolated from the Entry-Exit Ports in Fujian Province, China, 2013-2015. Jpn J Infect Dis 2017; 70:554-558. [PMID: 28674315 DOI: 10.7883/yoken.jjid.2016.577] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Over the past decade, indigenous dengue outbreaks have occurred occasionally in Fujian province in southeastern China because of sporadic imported dengue viruses (DENV). In this study, 3 DENV-2 and 2 DENV-4 strains were isolated from suspected febrile travelers at 2 ports of entry in Fujian between 2013-2015. Complete viral genome sequences of these new isolates were obtained with Sanger chemistry. Genomic sequence analyses revealed that these strains belonged to genotypes of 2-Cosmopolitan and 4-II. Consistent with the patients' travel information, phylogenetic analyses of the complete coding regions also indicated that most of the new isolates were genetically similar to the circulating strains in Southeast Asia rather than previous Chinese strains that were available. Therefore, phylogenetic analyses of the imported DENV demonstrated that multiple introductions of DENV emerged continuously in Fujian, and highlighted the importance of dengue surveillance at entry-exit ports in the subtropical regions of southern China.
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Affiliation(s)
- Bo Gao
- Fujian Agriculture & Forestry University.,Fujian International Travel Healthcare Center
| | | | - Yuping Wang
- Fujian International Travel Healthcare Center
| | - Fan Chen
- Fujian International Travel Healthcare Center
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