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Naknaen A, Surachat K, Manit J, Jetwanna KWN, Thawonsuwan J, Pomwised R. Virulent properties and genomic diversity of Vibrio vulnificus isolated from environment, human, diseased fish. Microbiol Spectr 2024:e0007924. [PMID: 38860819 DOI: 10.1128/spectrum.00079-24] [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: 01/18/2024] [Accepted: 05/02/2024] [Indexed: 06/12/2024] Open
Abstract
The incidence of Vibrio vulnificus infections, with high mortality rates in humans and aquatic animals, has escalated, highlighting a significant public health challenge. Currently, reliable markers to identify strains with high virulence potential are lacking, and the understanding of evolutionary drivers behind the emergence of pathogenic strains is limited. In this study, we analyzed the distribution of virulent genotypes and phenotypes to discern the infectious potential of V. vulnificus strains isolated from three distinct sources. Most isolates, traditionally classified as biotype 1, possessed the virulence-correlated gene-C type. Environmental isolates predominantly exhibited YJ-like alleles, while clinical and diseased fish isolates were significantly associated with the nanA gene and pathogenicity region XII. Hemolytic activity was primarily observed in the culture supernatants of clinical and diseased fish isolates. Genetic relationships, as determined by multiple-locus variable-number tandem repeat analysis, suggested that strains originating from the same source tended to cluster together. However, multilocus sequence typing revealed considerable genetic diversity across clusters and sources. A phylogenetic analysis using single nucleotide polymorphisms of diseased fish strains alongside publicly available genomes demonstrated a high degree of evolutionary relatedness within and across different isolation sources. Notably, our findings reveal no direct correlation between phylogenetic patterns, isolation sources, and virulence capabilities. This underscores the necessity for proactive risk management strategies to address pathogenic V. vulnificus strains emerging from environmental reservoirs.IMPORTANCEAs the global incidence of Vibrio vulnificus infections rises, impacting human health and marine aquacultures, understanding the pathogenicity of environmental strains remains critical yet underexplored. This study addresses this gap by evaluating the virulence potential and genetic relatedness of V. vulnificus strains, focusing on environmental origins. We conduct an extensive genotypic analysis and phenotypic assessment, including virulence testing in a wax moth model. Our findings aim to uncover genetic and evolutionary factors that drive pathogenic strain emergence in the environment. This research advances our ability to identify reliable virulence markers and understand the distribution of pathogenic strains, offering significant insights for public health and environmental risk management.
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Affiliation(s)
- Ampapan Naknaen
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
- Division of Biological Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | - Komwit Surachat
- Department of Biomedical Sciences and Biomedical Engineering, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
- Translational Medicine Research Center, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand
| | - Jutamas Manit
- Division of Biological Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand
| | | | - Jumroensri Thawonsuwan
- Department of Fisheries, Aquatic Animal Health Research and Development Division, Songkhla Aquatic Animal Health Research Center, Songkhla, Thailand
| | - Rattanaruji Pomwised
- Division of Biological Science, Faculty of Science, Prince of Songkla University, Hat Yai, Songkhla, Thailand
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2
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Hernández-Cabanyero C, Sanjuán E, Mercado L, Amaro C. Evidence that fish death after Vibrio vulnificus infection is due to an acute inflammatory response triggered by a toxin of the MARTX family. FISH & SHELLFISH IMMUNOLOGY 2023; 142:109131. [PMID: 37832748 DOI: 10.1016/j.fsi.2023.109131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/27/2023] [Accepted: 10/01/2023] [Indexed: 10/15/2023]
Abstract
Vibrio vulnificus is an emerging zoonotic pathogen associated with fish farms that is capable of causing a hemorrhagic septicemia known as warm-water vibriosis. According to a recent transcriptomic and functional study, the death of fish due to vibriosis is more related to the inflammatory response of the host than to the tissue lesions caused by the pathogen. In this work, we hypothesize that the RtxA1 toxin (a V. vulnificus toxin of the MARTX (Multifunctional Autoprocessing Repeats in Toxin) family) is the key virulence factor that would directly or indirectly trigger this fatal inflammatory response. Our hypothesis was based on previous studies that showed that rtxA1-deficient mutants maintained their ability to colonize and invade, but were unable to kill fish. To demonstrate this hypothesis, we infected eels (model of fish vibriosis) by immersion with a mutant deficient in RtxA1 production and analyzed their transcriptome in blood, red blood cells and white blood cells during early vibriosis (0, 3 and 12 h post-infection). The transcriptomic results were compared with those obtained in the previous study in which eels were infected with the V. vulnificus parental strain, and were functionally validated. Overall, our results confirm that fish death after V. vulnificus infection is due to an acute, early and atypical inflammatory response triggered by RtxA1 in which red blood cells seem to play a central role. These results could be relevant to other vibriosis as the toxins of this family are widespread in the Vibrio genus.
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Affiliation(s)
- Carla Hernández-Cabanyero
- Instituto Universitario de Biotecnología y Biomedicina (BIOTECMED), Universitat de València, Dr. Moliner, 50, 46100, Valencia, Spain
| | - Eva Sanjuán
- Instituto Universitario de Biotecnología y Biomedicina (BIOTECMED), Universitat de València, Dr. Moliner, 50, 46100, Valencia, Spain
| | - Luis Mercado
- Instituto de Biología. Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile
| | - Carmen Amaro
- Instituto Universitario de Biotecnología y Biomedicina (BIOTECMED), Universitat de València, Dr. Moliner, 50, 46100, Valencia, Spain.
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3
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Waidner LA, Potdukhe TV. Tools to Enumerate and Predict Distribution Patterns of Environmental Vibrio vulnificus and Vibrio parahaemolyticus. Microorganisms 2023; 11:2502. [PMID: 37894160 PMCID: PMC10609196 DOI: 10.3390/microorganisms11102502] [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: 09/07/2023] [Revised: 09/28/2023] [Accepted: 10/03/2023] [Indexed: 10/29/2023] Open
Abstract
Vibrio vulnificus (Vv) and Vibrio parahaemolyticus (Vp) are water- and foodborne bacteria that can cause several distinct human diseases, collectively called vibriosis. The success of oyster aquaculture is negatively impacted by high Vibrio abundances. Myriad environmental factors affect the distribution of pathogenic Vibrio, including temperature, salinity, eutrophication, extreme weather events, and plankton loads, including harmful algal blooms. In this paper, we synthesize the current understanding of ecological drivers of Vv and Vp and provide a summary of various tools used to enumerate Vv and Vp in a variety of environments and environmental samples. We also highlight the limitations and benefits of each of the measurement tools and propose example alternative tools for more specific enumeration of pathogenic Vv and Vp. Improvement of molecular methods can tighten better predictive models that are potentially important for mitigation in more controlled environments such as aquaculture.
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Affiliation(s)
- Lisa A. Waidner
- Hal Marcus College of Science and Engineering, University of West Florida, 11000 University Pkwy, Building 58, Room 108, Pensacola, FL 32514, USA
| | - Trupti V. Potdukhe
- GEMS Program, College of Medicine, University of Illinois Chicago, 1853 W. Polk St., Chicago, IL 60612, USA;
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4
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Roig Molina FJ, Amaro González C, Alcaine Otín A, Carro Fernández J. Vibrio vulnificus mutation rate: an in vitro approach. Front Microbiol 2023; 14:1223293. [PMID: 37621400 PMCID: PMC10445137 DOI: 10.3389/fmicb.2023.1223293] [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: 05/15/2023] [Accepted: 07/13/2023] [Indexed: 08/26/2023] Open
Abstract
Vibrio vulnificus is a multi-host pathogenic species currently subdivided into five phylogenetic lineages (L) plus one pathovar with the ability to infect fish due to a transmissible virulence plasmid. This plasmid (or a fragment of it) has been transmitted between lineages within the species, contributing to the evolution of V. vulnificus. This study aimed to provide an experimental approximation to the V. vulnificus mutation rate by determining spontaneous mutation rates from bacterial cultures of representants of the different lineages by whole-genome sequencing. To this purpose, synonymous SNP differences, i.e., spontaneous mutation not subjected to the evolutive forces, between initial and final culture after serial growth were evaluated and used for mutation rate calculation.
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Affiliation(s)
- Francisco Jose Roig Molina
- Computing for Medical and Biological Applications Group, Facultad de Ciencias de la Salud, Universidad San Jorge, Zaragoza, Spain
| | - Carmen Amaro González
- Departamento de Microbiología y Ecología, Universidad de Valencia, Valencia, Spain
- Estructura de Investigación Interdisciplinar en Biotecnología y Biomedicina BIOTECMED, University of Valencia, Valencia, Spain
| | - Alejandro Alcaine Otín
- Computing for Medical and Biological Applications Group, Facultad de Ciencias de la Salud, Universidad San Jorge, Zaragoza, Spain
| | - Jesús Carro Fernández
- Computing for Medical and Biological Applications Group, Facultad de Ciencias de la Salud, Universidad San Jorge, Zaragoza, Spain
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5
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Natnan ME, Low CF, Chong CM, Bunawan H, Baharum SN. Oleic acid as potential immunostimulant in metabolism pathways of hybrid grouper fingerlings (Epinephelus fuscoguttatus × Epinephelus lanceolatus) infected with Vibrio vulnificus. Sci Rep 2023; 13:12830. [PMID: 37553472 PMCID: PMC10409752 DOI: 10.1038/s41598-023-40096-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 08/04/2023] [Indexed: 08/10/2023] Open
Abstract
Grouper culture has been expanding in Malaysia due to the huge demand locally and globally. However, due to infectious diseases such as vibriosis, the fish mortality rate increased, which has affected the production of grouper. Therefore, this study focuses on the metabolic profiling of surviving infected grouper fed with different formulations of fatty acid diets that acted as immunostimulants for the fish to achieve desirable growth and health performance. After a six-week feeding trial and one-week post-bacterial challenge, the surviving infected grouper was sampled for GC-MS analysis. For metabolite extraction, a methanol/chloroform/water (2:2:1.8) extraction method was applied to the immune organs (spleen and liver) of surviving infected grouper. The distribution patterns of metabolites between experimental groups were then analyzed using a metabolomics platform. A total of 50 and 81 metabolites were putatively identified from the spleen and liver samples, respectively. Our further analysis identified glycine, serine, and threonine metabolism, and alanine, aspartate and glutamate metabolism had the most impacted pathways, respectively, in spleen and liver samples from surviving infected grouper. The metabolites that were highly abundant in the spleen found in these pathways were glycine (20.9%), l-threonine (1.0%) and l-serine (0.8%). Meanwhile, in the liver l-glutamine (1.8%) and aspartic acid (0.6%) were found to be highly abundant. Interestingly, among the fish diet groups, grouper fed with oleic acid diet produced more metabolites with a higher percent area compared to the control diets. The results obtained from this study elucidate the use of oleic acid as an immunostimulant in fish feed formulation affects more various immune-related metabolites than other formulated feed diets for vibriosis infected grouper.
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Affiliation(s)
- Maya Erna Natnan
- Metabolomics Research Laboratory, Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia, UKM, 43600, Bangi, Selangor, Malaysia
| | - Chen-Fei Low
- Metabolomics Research Laboratory, Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia, UKM, 43600, Bangi, Selangor, Malaysia
| | - Chou-Min Chong
- Laboratory of Immunogenomics, Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, 43400, Serdang, Selangor, Malaysia
| | - Hamidun Bunawan
- Metabolomics Research Laboratory, Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia, UKM, 43600, Bangi, Selangor, Malaysia
| | - Syarul Nataqain Baharum
- Metabolomics Research Laboratory, Institute of Systems Biology (INBIOSIS), Universiti Kebangsaan Malaysia, UKM, 43600, Bangi, Selangor, Malaysia.
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6
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Schütt EM, Hundsdörfer MAJ, von Hoyningen-Huene AJE, Lange X, Koschmider A, Oppelt N. First Steps towards a near Real-Time Modelling System of Vibrio vulnificus in the Baltic Sea. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2023; 20:ijerph20085543. [PMID: 37107825 PMCID: PMC10138452 DOI: 10.3390/ijerph20085543] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Revised: 03/24/2023] [Accepted: 04/10/2023] [Indexed: 05/11/2023]
Abstract
Over the last two decades, Vibrio vulnificus infections have emerged as an increasingly serious public health threat along the German Baltic coast. To manage related risks, near real-time (NRT) modelling of V. vulnificus quantities has often been proposed. Such models require spatially explicit input data, for example, from remote sensing or numerical model products. We tested if data from a hydrodynamic, a meteorological, and a biogeochemical model are suitable as input for an NRT model system by coupling it with field samples and assessing the models' ability to capture known ecological parameters of V. vulnificus. We also identify the most important predictors for V. vulnificus in the Baltic Sea by leveraging the St. Nicolas House Analysis. Using a 27-year time series of sea surface temperature, we have investigated trends of V. vulnificus season length, which pinpoint hotspots mainly in the east of our study region. Our results underline the importance of water temperature and salinity on V. vulnificus abundance but also highlight the potential of air temperature, oxygen, and precipitation to serve as predictors in a statistical model, albeit their relationship with V. vulnificus may not be causal. The evaluated models cannot be used in an NRT model system due to data availability constraints, but promising alternatives are presented. The results provide a valuable basis for a future NRT model for V. vulnificus in the Baltic Sea.
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Affiliation(s)
- Eike M. Schütt
- Earth Observation and Modelling, Department of Geography, Kiel University, 24118 Kiel, Germany
- Correspondence:
| | - Marie A. J. Hundsdörfer
- Earth Observation and Modelling, Department of Geography, Kiel University, 24118 Kiel, Germany
| | | | - Xaver Lange
- Leibniz Institute for Baltic Sea Research Warnemünde, 18119 Rostock, Germany
| | - Agnes Koschmider
- Business Informatics and Process Analytics, University of Bayreuth, 95447 Bayreuth, Germany
| | - Natascha Oppelt
- Earth Observation and Modelling, Department of Geography, Kiel University, 24118 Kiel, Germany
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7
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Amaro C, Carmona-Salido H. Vibrio vulnificus, an Underestimated Zoonotic Pathogen. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1404:175-194. [PMID: 36792876 DOI: 10.1007/978-3-031-22997-8_9] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
V. vulnificus, continues being an underestimated yet lethal zoonotic pathogen. In this chapter, we provide a comprehensive review of numerous aspects of the biology, epidemiology, and virulence mechanisms of this poorly understood pathogen. We will emphasize the widespread role of horizontal gene transfer in V. vulnificus specifically virulence plasmids and draw parallels from aquaculture farms to human health. By placing current findings in the context of climate change, we will also contend that fish farms act as evolutionary drivers that accelerate species evolution and the emergence of new virulent groups. Overall, we suggest that on-farm control measures should be adopted both to protect animals from Vibriosis, and also as a public health measure to prevent the emergence of new zoonotic groups.
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Affiliation(s)
- Carmen Amaro
- Departamento de Microbiología y Ecología, & Instituto Universitario de Biotecnologia i Biomedicina (BIOTECMED), Universitat de València, Burjassot, Valencia, Spain.
| | - Héctor Carmona-Salido
- Departamento de Microbiología y Ecología, & Instituto Universitario de Biotecnologia i Biomedicina (BIOTECMED), Universitat de València, Burjassot, Valencia, Spain
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8
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Almagro-Moreno S, Martinez-Urtaza J, Pukatzki S. Vibrio Infections and the Twenty-First Century. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1404:1-16. [PMID: 36792868 DOI: 10.1007/978-3-031-22997-8_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
The Vibrionaceae is a highly diverse family of aquatic bacteria. Some members of this ubiquitous group can cause a variety of diseases in humans ranging from cholera caused by Vibrio cholerae, severe septicemia caused by Vibrio vulnificus, to acute gastroenteritis by Vibrio parahaemolyticus. Planet Earth is experiencing unprecedented changes of planetary scale associated with climate change. These environmental perturbations paired with overpopulation and pollution are increasing the distribution of pathogenic Vibrios and exacerbating the risk of causing infections. In this chapter, we discuss various aspects of Vibrio infections within the context of the twenty-first century with a major emphasis on the aforementioned pathogenic species. Overall, we believe that the twenty-first century is posed to be both one full of challenges due to the rise of these pathogens, and also a catalyst for innovative and groundbreaking discoveries.
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Affiliation(s)
- Salvador Almagro-Moreno
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL, USA. .,National Center for Integrated Coastal Research, University of Central Florida, Orlando, FL, USA.
| | - Jaime Martinez-Urtaza
- Department de Genetica I de Microbiologia, Facultat de Biociencies, Universitat Autonoma de Barcelona, Barcelona, Spain
| | - Stefan Pukatzki
- Department of Biology, The City College of New York, New York, NY, USA
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9
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A multiplex PCR for the detection of Vibrio vulnificus hazardous to human and/or animal health from seafood. Int J Food Microbiol 2022; 377:109778. [PMID: 35696749 DOI: 10.1016/j.ijfoodmicro.2022.109778] [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: 04/26/2022] [Revised: 05/31/2022] [Accepted: 06/01/2022] [Indexed: 01/11/2023]
Abstract
Vibrio vulnificus is a zoonotic pathogen linked to aquaculture that is spreading due to climate change. The pathogen can be transmitted to humans and animals by ingestion of raw shellfish or seafood feed, respectively. The aim of this work was to design and test a new procedure to detect V. vulnificus hazardous to human and/or animal health in food/feed samples. For this purpose, we combined a pre-enrichment step with multiplex PCR using primers for the species and for human and animal virulence markers. In vitro assays with mixed DNA from different Vibrio species and Vibrio cultures showed that the new protocol was 100 % specific with a detection limit of 10 cfu/mL. The protocol was successfully validated in seafood using artificially contaminated live shrimp and proved useful also in pathogen isolation from animals and their ecosystem. In conclusion, this novel protocol could be applied in health risk studies associated with food/feed consumption, as well as in the routine identification and subtyping of V. vulnificus from environmental or clinical samples.
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Wu Z, Wu Y, Gao H, He X, Yao Q, Yang Z, Zhou J, Ji L, Gao J, Jia X, Dou Y, Wang X, Shao P. Identification and whole-genome sequencing analysis of Vibrio vulnificus strains causing pearl gentian grouper disease in China. BMC Microbiol 2022; 22:200. [PMID: 35974308 PMCID: PMC9380395 DOI: 10.1186/s12866-022-02610-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Accepted: 07/29/2022] [Indexed: 11/28/2022] Open
Abstract
Vibrio vulnificus is a pathogenic bacterium that causes disease in marine fish, affecting fish farming and human health worldwide. In May 2021, in the Bohai Bay region, a disease broke out in commercially farmed pearl gentian grouper (♀Epinephelus fuscoguttatus × ♂Epinephelus lanceolatus), causing huge economic losses. The diseased fish had skin lesions, water accumulation in their abdomens, and showed tissue and organ damage. V. vulnificus biotype 2 has been reported in eels and other marine fish, but it is less reported in pearl gentian grouper. In this study, the pathogenic strain isolated from diseased fish was identified as V. vulnificus EPL 0201 biotype 2 on the basis of physiological and biochemical characteristics and the results of 16S rRNA gene and gyrB sequencing, virulence gene detection, and recursive infection experiments. To gain a comprehensive understanding of the pathogenicity and drug resistance of this strain, whole-genome sequencing was performed. Whole-genome analysis showed that the gene map of this strain was complete. The Virulence Factor Database annotation results showed that this strain had the key virulence factor genes vvhA and rtxA, which cause host disease. In addition, this strain had genes conferring resistance against cephalosporins, aminoglycosides, tetracyclines, and sulfonamides. Antimicrobial susceptibility testing confirmed the presence of these resistance genes identified in the genome. The results of this study show that V. vulnificus EPL 0201 biotype 2 is a multi-drug resistant strain with high pathogenicity.
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Affiliation(s)
- Zun Wu
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Yating Wu
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Haofeng Gao
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Xuexin He
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Qiang Yao
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Zhanglei Yang
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Jinyi Zhou
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Linting Ji
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Jinwei Gao
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Xuying Jia
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Yong Dou
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China
| | - Xiaoyu Wang
- Tianjin Fisheries Research Institute, 422 Jiefang Nan Road, He Xi District, Tianjin, 300221, People's Republic of China.
| | - Peng Shao
- Tianjin Key Lab of Aqua-Ecology and Aquaculture, College of Fisheries, Tianjin Agricultural University, Tianjin, 300384, People's Republic of China.
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11
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Hernández-Cabanyero C, Sanjuán E, Reyes-López FE, Vallejos-Vidal E, Tort L, Amaro C. A Transcriptomic Study Reveals That Fish Vibriosis Due to the Zoonotic Pathogen Vibrio vulnificus Is an Acute Inflammatory Disease in Which Erythrocytes May Play an Important Role. Front Microbiol 2022; 13:852677. [PMID: 35432241 PMCID: PMC9011161 DOI: 10.3389/fmicb.2022.852677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Accepted: 03/07/2022] [Indexed: 11/13/2022] Open
Abstract
Vibrio vulnificus is a marine zoonotic pathogen associated with fish farms that is considered a biomarker of climate change. Zoonotic strains trigger a rapid death of their susceptible hosts (fish or humans) by septicemia that has been linked to a cytokine storm in mice. Therefore, we hypothesize that V. vulnificus also causes fish death by triggering a cytokine storm in which red blood cells (RBCs), as nucleated cells in fish, could play an active role. To do it, we used the eel immersion infection model and then analyzed the transcriptome in RBCs, white BCs, and whole blood using an eel-specific microarray platform. Our results demonstrate that V. vulnificus triggers an acute but atypical inflammatory response that occurs in two main phases. The early phase (3 h post-infection [hpi]) is characterized by the upregulation of several genes for proinflammatory cytokines related to the mucosal immune response (il17a/f1 and il20) along with genes for antiviral cytokines (il12β) and antiviral factors (ifna and ifnc). In contrast, the late phase (12 hpi) is based on the upregulation of genes for typical inflammatory cytokines (il1β), endothelial destruction (mmp9 and hyal2), and, interestingly, genes related to an RNA-based immune response (sidt1). Functional assays revealed significant proteolytic and hemolytic activity in serum at 12 hpi that would explain the hemorrhages characteristic of this septicemia in fish. As expected, we found evidence that RBCs are transcriptionally active and contribute to this atypical immune response, especially in the short term. Based on a selected set of marker genes, we propose here an in vivo RT-qPCR assay that allows detection of early sepsis caused by V. vulnificus. Finally, we develop a model of sepsis that could serve as a basis for understanding sepsis caused by V. vulnificus not only in fish but also in humans.
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Affiliation(s)
- Carla Hernández-Cabanyero
- Instituto Universitario de Biotecnología y Biomedicina (BIOTECMED), Universitat de València, Valencia, Spain
| | - Eva Sanjuán
- Instituto Universitario de Biotecnología y Biomedicina (BIOTECMED), Universitat de València, Valencia, Spain
| | - Felipe E. Reyes-López
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
- Department of Cell Biology, Physiology, and Immunology, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Eva Vallejos-Vidal
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
- Facultad de Medicina Veterinaria y Agronomía, Universidad de Las Américas, Santiago, Chile
| | - Lluis Tort
- Department of Cell Biology, Physiology, and Immunology, Universitat Autònoma de Barcelona, Bellaterra, Spain
| | - Carmen Amaro
- Instituto Universitario de Biotecnología y Biomedicina (BIOTECMED), Universitat de València, Valencia, Spain
- *Correspondence: Carmen Amaro,
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12
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Mekasha S, Linke D. Secretion Systems in Gram-Negative Bacterial Fish Pathogens. Front Microbiol 2022; 12:782673. [PMID: 34975803 PMCID: PMC8714846 DOI: 10.3389/fmicb.2021.782673] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Accepted: 11/24/2021] [Indexed: 12/17/2022] Open
Abstract
Bacterial fish pathogens are one of the key challenges in the aquaculture industry, one of the fast-growing industries worldwide. These pathogens rely on arsenal of virulence factors such as toxins, adhesins, effectors and enzymes to promote colonization and infection. Translocation of virulence factors across the membrane to either the extracellular environment or directly into the host cells is performed by single or multiple dedicated secretion systems. These secretion systems are often key to the infection process. They can range from simple single-protein systems to complex injection needles made from dozens of subunits. Here, we review the different types of secretion systems in Gram-negative bacterial fish pathogens and describe their putative roles in pathogenicity. We find that the available information is fragmented and often descriptive, and hope that our overview will help researchers to more systematically learn from the similarities and differences between the virulence factors and secretion systems of the fish-pathogenic species described here.
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Affiliation(s)
- Sophanit Mekasha
- Section for Genetics and Evolutionary Biology, Department of Biosciences, University of Oslo, Oslo, Norway
| | - Dirk Linke
- Section for Genetics and Evolutionary Biology, Department of Biosciences, University of Oslo, Oslo, Norway
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13
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Carda-Diéguez M, Amaro C. A Method of Transposon Insertion Sequencing in Comprehensively Identifying Vibrio vulnificus Genes Required for Growth in Human Serum. Methods Mol Biol 2021; 2377:159-178. [PMID: 34709616 DOI: 10.1007/978-1-0716-1720-5_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
One of the most powerful approaches to detect the loci that enable a pathogen to cause disease is the creation of a high-density transposon mutant library by transposon insertion sequencing (TIS) and the screening of the library using an adequate in vivo and/or ex vivo model of the disease. Here we describe the procedure for detection of the putative loci required for a septicemic pathogen to cause sepsis in humans by using TIS plus an ex vivo model of septicaemia: to grow the pathogen in fresh and inactivated human serum. We selected V. vulnificus because it is a highly invasive pathogen capable of spreading from an infection site to the bloodstream, causing sepsis and death in less than 24 h. To survive and proliferate in blood (or host serum), the pathogen requires mechanisms to overcome the innate immune defenses and metabolic limitations of this host niche. Initially, genes under-represented for insertions can be used to estimate the V. vulnificus essential gene set. Analysis of the relative abundance of insertion mutants in the library after exposure to serum would detect which genes are essential for the pathogen to overcome the diverse limitations imposed by serum.
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Affiliation(s)
- Miguel Carda-Diéguez
- Department of Microbiology and Ecology, University of Valencia, Valencia, Spain.
| | - Carmen Amaro
- Department of Microbiology and Ecology, University of Valencia, Valencia, Spain
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14
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Conforto E, Vílchez-Gómez L, Parrinello D, Parisi MG, Esteban MÁ, Cammarata M, Guardiola FA. Role of mucosal immune response and histopathological study in European eel (Anguilla anguilla L.) intraperitoneal challenged by Vibrio anguillarum or Tenacibaculum soleae. FISH & SHELLFISH IMMUNOLOGY 2021; 114:330-339. [PMID: 34015481 DOI: 10.1016/j.fsi.2021.05.011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 05/07/2021] [Accepted: 05/12/2021] [Indexed: 06/12/2023]
Abstract
The external mucus layer that covers fish skin contains numerous immune substances scarcely studied that act as the first line of defence against a broad spectrum of pathogens. This study aimed to characterize and describe for the first time several humoral immune defence parameters in the skin mucus of the European eel (Anguilla anguilla) after intraperitoneal injection with Vibrio anguillarum or Tenacibaculum soleae. This study evaluated several immune-related enzymes and bactericidal activity against fish pathogenic bacteria in the skin mucus of European eels at 24, 48, and 72 h post-challenge. The results demonstrated that European eel skin mucus showed significant increments in peroxidase and lysozyme activity at 48 and 72 h after V. anguillarum challenge, compared to other experimental groups. In the case of antiprotease activity, an increase was observed at 24 h in the skin mucus of fish challenged with V. anguillarum compared to unchallenged fish, while this activity was undetected at 48 and 72 h. In contrast, protease activity had decreased at 48 and 72 h in the skin mucus of fish challenged with V. anguillarum compared to the unchallenged group. Regarding bactericidal activity, a high growth capacity of T. soleae was observed in the skin mucus of all experimental groups. Interestingly, the skin mucus from fish challenged with V. anguillarum exhibited increased bactericidal activity against this bacterium at 48 h, compared to unchallenged fish. Finally, severe histopathological alterations were observed in the gills and liver at the end of the trial (72 h), whereas the skin showed only an overspread presence of goblet cells in the challenged fish compared to unchallenged fish. The present results may give new insights into the mucosal immune system of this primitive species with potential applications in aquaculture.
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Affiliation(s)
- Emanuele Conforto
- Marine Immunobiology Laboratory, Department of Earth and Marine Sciences, University of Palermo, Viale delle Scienze, Ed.16, 90128, Palermo, Italy
| | - Luciano Vílchez-Gómez
- Department of Cellular Biology and Histology, Faculty of Biology, University of Murcia, Campus of International Excellence, Campus Mare Nostrum, 30100, Murcia, Spain
| | - Daniela Parrinello
- Marine Immunobiology Laboratory, Department of Earth and Marine Sciences, University of Palermo, Viale delle Scienze, Ed.16, 90128, Palermo, Italy
| | - Maria Giovanna Parisi
- Marine Immunobiology Laboratory, Department of Earth and Marine Sciences, University of Palermo, Viale delle Scienze, Ed.16, 90128, Palermo, Italy
| | - María Ángeles Esteban
- Department of Cellular Biology and Histology, Faculty of Biology, University of Murcia, Campus of International Excellence, Campus Mare Nostrum, 30100, Murcia, Spain
| | - Matteo Cammarata
- Marine Immunobiology Laboratory, Department of Earth and Marine Sciences, University of Palermo, Viale delle Scienze, Ed.16, 90128, Palermo, Italy.
| | - Francisco A Guardiola
- Department of Cellular Biology and Histology, Faculty of Biology, University of Murcia, Campus of International Excellence, Campus Mare Nostrum, 30100, Murcia, Spain; Interdisciplinary Centre of Marine and Environmental Research (CIIMAR), University of Porto, Terminal de Cruzeiros do Porto de Leixões, Av. General Norton de Matos s/n, 4450-208, Porto, Portugal.
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15
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Draft Genome Sequences of Vibrio vulnificus Strains Recovered from Moribund Tilapia. Microbiol Resour Announc 2021; 10:e0009421. [PMID: 34080900 PMCID: PMC8354540 DOI: 10.1128/mra.00094-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Potentially zoonotic Vibrio vulnificus strains were isolated from vibriosis outbreaks occurring on eastern Mediterranean tilapia farms between 2016 and 2019. In this work, the draft genome sequences of three representative isolates are presented.
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16
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Maroc L, Fairhead C. Lessons from the Nakaseomyces: mating-type switching, DSB repair and evolution of Ho. Curr Genet 2021; 67:685-693. [PMID: 33830322 DOI: 10.1007/s00294-021-01182-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 03/22/2021] [Accepted: 03/24/2021] [Indexed: 12/19/2022]
Abstract
This short paper aims to review what our recent studies in the Nakaseomyces yeasts, principally Candida glabrata, reveal about the evolution of the mating-type switching system and its components, as well as about the repair of chromosomal double-strand breaks in this clade. In the model yeast Saccharomyces cerevisiae, the study of mating-type switching has, over the years, led to major discoveries in how cells process chromosomal breaks. Indeed, in this species, switching, which allows every haploid cell to produce cells of opposite mating types that can mate together, is initiated by the Ho endonuclease, linking sexual reproduction to a programmed chromosomal cut. More recently, the availability of other yeasts' genomes from type strains and from populations, and the ability to manipulate and edit the genomes of most yeasts in the laboratory, has enabled scientists to explore mating-type switching in new species, thus enriching our evolutionary perspective on this phenomenon. In this review, we will show how the study of mating-type switching in C. glabrata and Nakaseomyces delphensis has allowed us to reveal possible additional roles for Ho, and also to discover major differences in DSB repair at central and subtelomeric sexual loci. In addition, we report how the study of repair of chromosomal breaks induced by CRISPR-Cas9 reveals that efficient and faithful NHEJ is a major repair pathway in C. glabrata.
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Affiliation(s)
- Laetitia Maroc
- GQE-Le Moulon, Université Paris-Saclay, INRAE, CNRS, AgroParisTech, Ferme du Moulon, 91190, Gif-sur-Yvette, France
| | - Cécile Fairhead
- GQE-Le Moulon, Université Paris-Saclay, INRAE, CNRS, AgroParisTech, Ferme du Moulon, 91190, Gif-sur-Yvette, France.
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17
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Lisboa J, Pereira C, Rifflet A, Ayala J, Terceti MS, Barca AV, Rodrigues I, Pereira PJB, Osorio CR, García-Del Portillo F, Gomperts Boneca I, do Vale A, Dos Santos NMS. A Secreted NlpC/P60 Endopeptidase from Photobacterium damselae subsp. piscicida Cleaves the Peptidoglycan of Potentially Competing Bacteria. mSphere 2021; 6:e00736-20. [PMID: 33536321 PMCID: PMC7860986 DOI: 10.1128/msphere.00736-20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Accepted: 01/08/2021] [Indexed: 11/20/2022] Open
Abstract
Peptidoglycan (PG) is a major component of the bacterial cell wall, forming a mesh-like structure enwrapping the bacteria that is essential for maintaining structural integrity and providing support for anchoring other components of the cell envelope. PG biogenesis is highly dynamic and requires multiple enzymes, including several hydrolases that cleave glycosidic or amide bonds in the PG. This work describes the structural and functional characterization of an NlpC/P60-containing peptidase from Photobacterium damselae subsp. piscicida (Phdp), a Gram-negative bacterium that causes high mortality of warm-water marine fish with great impact for the aquaculture industry. PnpA ( PhotobacteriumNlpC-like protein A) has a four-domain structure with a hydrophobic and narrow access to the catalytic center and specificity for the γ-d-glutamyl-meso-diaminopimelic acid bond. However, PnpA does not cleave the PG of Phdp or PG of several Gram-negative and Gram-positive bacterial species. Interestingly, it is secreted by the Phdp type II secretion system and degrades the PG of Vibrio anguillarum and Vibrio vulnificus This suggests that PnpA is used by Phdp to gain an advantage over bacteria that compete for the same resources or to obtain nutrients in nutrient-scarce environments. Comparison of the muropeptide composition of PG susceptible and resistant to the catalytic activity of PnpA showed that the global content of muropeptides is similar, suggesting that susceptibility to PnpA is determined by the three-dimensional organization of the muropeptides in the PG.IMPORTANCE Peptidoglycan (PG) is a major component of the bacterial cell wall formed by long chains of two alternating sugars interconnected by short peptides, generating a mesh-like structure that enwraps the bacterial cell. Although PG provides structural integrity and support for anchoring other components of the cell envelope, it is constantly being remodeled through the action of specific enzymes that cleave or join its components. Here, it is shown that Photobacterium damselae subsp. piscicida, a bacterium that causes high mortality in warm-water marine fish, produces PnpA, an enzyme that is secreted into the environment and is able to cleave the PG of potentially competing bacteria, either to gain a competitive advantage and/or to obtain nutrients. The specificity of PnpA for the PG of some bacteria and its inability to cleave others may be explained by differences in the structure of the PG mesh and not by different muropeptide composition.
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Affiliation(s)
- Johnny Lisboa
- Fish Immunology and Vaccinology Group, Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, Porto, Portugal
- Fish Immunology and Vaccinology Group, Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal
| | - Cassilda Pereira
- Fish Immunology and Vaccinology Group, Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, Porto, Portugal
- Fish Immunology and Vaccinology Group, Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal
| | - Aline Rifflet
- Institut Pasteur, Unité Biologie et Génétique de la Paroi Bactérienne, Paris, France
- INSERM Groupe Avenir, Paris, France
- CNRS, UMR "Integrated and Molecular Microbiology," Paris, France
| | - Juan Ayala
- Centro de Biología Molecular Severo Ochoa (CBMSO), Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
| | - Mateus S Terceti
- Departamento de Microbioloxía e Parasitoloxía, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Alba V Barca
- Departamento de Microbioloxía e Parasitoloxía, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Inês Rodrigues
- Fish Immunology and Vaccinology Group, Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, Porto, Portugal
- Fish Immunology and Vaccinology Group, Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal
| | - Pedro José Barbosa Pereira
- Biomolecular Structure Group, Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, Porto, Portugal
- Macromolecular Structure Group, Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal
| | - Carlos R Osorio
- Departamento de Microbioloxía e Parasitoloxía, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Francisco García-Del Portillo
- Laboratorio de Patógenos Bacterianos Intracelulares, Centro Nacional de Biotecnología (CNB), Consejo Superior de Investigaciones Científicas (CSIC), Madrid, Spain
| | - Ivo Gomperts Boneca
- Institut Pasteur, Unité Biologie et Génétique de la Paroi Bactérienne, Paris, France
- INSERM Groupe Avenir, Paris, France
- CNRS, UMR "Integrated and Molecular Microbiology," Paris, France
| | - Ana do Vale
- Fish Immunology and Vaccinology Group, Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, Porto, Portugal
- Fish Immunology and Vaccinology Group, Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal
| | - Nuno M S Dos Santos
- Fish Immunology and Vaccinology Group, Instituto de Biologia Molecular e Celular (IBMC), Universidade do Porto, Porto, Portugal
- Fish Immunology and Vaccinology Group, Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal
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18
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Hernández-Cabanyero C, Amaro C. Phylogeny and life cycle of the zoonotic pathogen Vibrio vulnificus. Environ Microbiol 2020; 22:4133-4148. [PMID: 32567215 DOI: 10.1111/1462-2920.15137] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 06/17/2020] [Accepted: 06/18/2020] [Indexed: 01/08/2023]
Abstract
Vibrio vulnificus is a zoonotic pathogen able to cause diseases in humans and fish that occasionally result in sepsis and death. Most reviews about this pathogen (including those related to its ecology) are clearly biased towards its role as a human pathogen, emphasizing its relationship with oysters as its main reservoir, the role of the known virulence factors as well as the clinic and the epidemiology of the human disease. This review tries to give to the reader a wider vision of the biology of this pathogen covering aspects related to its phylogeny and evolution and filling the gaps in our understanding of the general strategies that V. vulnificus uses to survive outside and inside its two main hosts, the human and the eel, and how its response to specific environmental parameters determines its survival, its death, or the triggering of an infectious process.
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Affiliation(s)
| | - Carmen Amaro
- ERI-Biotecmed, University of Valencia, Dr. Moliner, 50, Valencia, 46100, Spain
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19
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Quinet T, Samba-Louaka A, Héchard Y, Van Doninck K, Van der Henst C. Delayed cytokinesis generates multinuclearity and potential advantages in the amoeba Acanthamoeba castellanii Neff strain. Sci Rep 2020; 10:12109. [PMID: 32694508 PMCID: PMC7374626 DOI: 10.1038/s41598-020-68694-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2020] [Accepted: 06/26/2020] [Indexed: 12/29/2022] Open
Abstract
Multinuclearity is a widespread phenomenon across the living world, yet how it is achieved, and the potential related advantages, are not systematically understood. In this study, we investigate multinuclearity in amoebae. We observe that non-adherent amoebae are giant multinucleate cells compared to adherent ones. The cells solve their multinuclearity by a stretchy cytokinesis process with cytosolic bridge formation when adherence resumes. After initial adhesion to a new substrate, the progeny of the multinucleate cells is more numerous than the sibling cells generated from uninucleate amoebae. Hence, multinucleate amoebae show an advantage for population growth when the number of cells is quantified over time. Multiple nuclei per cell are observed in different amoeba species, and the lack of adhesion induces multinuclearity in diverse protists such as Acanthamoeba castellanii, Vermamoeba vermiformis, Naegleria gruberi and Hartmannella rhysodes. In this study, we observe that agitation induces a cytokinesis delay, which promotes multinuclearity. Hence, we propose the hypothesis that multinuclearity represents a physiological adaptation under non-adherent conditions that can lead to biologically relevant advantages.
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Affiliation(s)
- Théo Quinet
- Laboratory of Evolutionary Genetics and Ecology, URBE, University of Namur, Namur, Belgium
| | - Ascel Samba-Louaka
- Laboratoire Ecologie et Biologie des Interactions, Equipe Microbiologie de L'Eau, Université de Poitiers, UMR CNRS 7267, 86073, Poitiers, France
| | - Yann Héchard
- Laboratoire Ecologie et Biologie des Interactions, Equipe Microbiologie de L'Eau, Université de Poitiers, UMR CNRS 7267, 86073, Poitiers, France
| | - Karine Van Doninck
- Laboratory of Evolutionary Genetics and Ecology, URBE, University of Namur, Namur, Belgium
| | - Charles Van der Henst
- Laboratory of Evolutionary Genetics and Ecology, URBE, University of Namur, Namur, Belgium. .,Research Unit in the Biology of Microorganisms (URBM), NARILIS, University of Namur (UNamur), Namur, Belgium. .,Microbial Resistance and Drug Discovery, Center for Structural Biology (CSB), Flanders Institute for Biotechnology (VIB), Vrije Universiteit Brussel (VUB), Pleinlaan 2, Building E-3, 1050, Brussels, Belgium. .,Structural Biology Brussels, Vrije Universiteit Brussel (VUB), Brussels, Belgium.
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20
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Zhao J, Wu L, Zhai S, Lin P, Guo S. Construction expression and immunogenicity of a novel trivalent outer membrane protein (OmpU-A-II) from three bacterial pathogens in Japanese eels (Anguilla japonica). JOURNAL OF FISH DISEASES 2020; 43:519-529. [PMID: 32285473 DOI: 10.1111/jfd.13132] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2019] [Revised: 12/12/2019] [Accepted: 12/13/2019] [Indexed: 06/11/2023]
Abstract
Vibrio vulnificus, Edwardsiella anguillarum and Aeromonas hydrophila are three common bacterial pathogens in cultivated eels. To protect farming eels from infection by these pathogens, a trivalent outer membrane protein (OMP) containing partial sequences of OmpU from V. vulnificus, OmpA from E. anguillarum and OmpII from A. hydrophila was expressed and purified; then, the OMP was used as a vaccine to immunize Japanese eels (Anguilla japonica). Whole-blood cell proliferation, antibody titres and complement and lysozyme activities were detected at different days post-immunization (dpi), and the relative per cent survival (RPS) was determined after eels were infected with V. vulnificus, E. anguillarum or A. hydrophila at 28 dpi. The results showed that the OMP significantly stimulates the antibody titres. At 14 days after the challenge (i.e. at 28 dpi), the RPS of OMP against V. vulnificus, E. anguillarum and A. hydrophila was 20%, 70% and 11.1%, respectively. The construction, expression and immunogenicity of a trivalent Omp were reported for the first time, and this study will provide a valuable reference for the development of fish multiplex vaccines.
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Affiliation(s)
- Jinping Zhao
- Fisheries College, Jimei University, Xiamen, China
- Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PRC, Xiamen, China
| | - Liqun Wu
- College of Overseas Education, Jimei University, Xiamen, China
| | - Shaowei Zhai
- Fisheries College, Jimei University, Xiamen, China
- Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PRC, Xiamen, China
| | - Peng Lin
- Fisheries College, Jimei University, Xiamen, China
- Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PRC, Xiamen, China
| | - Songlin Guo
- Fisheries College, Jimei University, Xiamen, China
- Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education of PRC, Xiamen, China
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21
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Hernández-Cabanyero C, Sanjuán E, Fouz B, Pajuelo D, Vallejos-Vidal E, Reyes-López FE, Amaro C. The Effect of the Environmental Temperature on the Adaptation to Host in the Zoonotic Pathogen Vibrio vulnificus. Front Microbiol 2020; 11:489. [PMID: 32296402 PMCID: PMC7137831 DOI: 10.3389/fmicb.2020.00489] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Accepted: 03/06/2020] [Indexed: 12/21/2022] Open
Abstract
Vibrio vulnificus is a zoonotic pathogen that lives in temperate, tropical and subtropical aquatic ecosystems whose geographical distribution is expanding due to global warming. The species is genetically variable and only the strains that belong to the zoonotic clonal-complex can cause vibriosis in both humans and fish (being its main host the eel). Interestingly, the severity of the vibriosis in the eel and the human depends largely on the water temperature (highly virulent at 28°C, avirulent at 20°C or below) and on the iron content in the blood, respectively. The objective of this work was to unravel the role of temperature in the adaptation to the host through a transcriptomic and phenotypic approach. To this end, we obtained the transcriptome of a zoonotic strain grown in a minimum medium (CM9) at 20, 25, 28, and 37°C, and confirmed the transcriptomic results by RT-qPCR and phenotypic tests. In addition, we compared the temperature stimulon with those previously obtained for iron and serum (from eel and human, respectively). Our results suggest that warm temperatures activate adaptive traits that would prepare the bacteria for host colonization (metabolism, motility, chemotaxis, and the protease activity) and fish septicemia (iron-uptake from transferrin and production of O-antigen of high molecular weight) in a generalized manner, while environmental iron controls the expression of a host-adapted virulent phenotype (toxins and the production of a protective envelope). Finally, our results confirm that beyond the effect of temperature on the V. vulnificus distribution in the environment, it also has an effect on the infectious capability of this pathogen that must be taken into account to predict the real risk of V. vulnificus infection caused by global warming.
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Affiliation(s)
- Carla Hernández-Cabanyero
- Departamento de Microbiología y Ecología and Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina, Universitat de València, Valencia, Spain
| | - Eva Sanjuán
- Departamento de Microbiología y Ecología and Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina, Universitat de València, Valencia, Spain
| | - Belén Fouz
- Departamento de Microbiología y Ecología and Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina, Universitat de València, Valencia, Spain
| | - David Pajuelo
- Departamento de Microbiología y Ecología and Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina, Universitat de València, Valencia, Spain
| | - Eva Vallejos-Vidal
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, Barcelona, Spain
- Centro de Biotecnología Acuícola, Facultad de Química y Biología, Universidad de Santiago de Chile, Santiago, Chile
| | - Felipe E. Reyes-López
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, Barcelona, Spain
| | - Carmen Amaro
- Departamento de Microbiología y Ecología and Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina, Universitat de València, Valencia, Spain
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22
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Guo S, He L, Wu L, Xiao Y, Zhai S, Yan Q. Immunization of a novel bivalent outer membrane protein simultaneously resisting Aeromonas hydrophila, Edwardsiella anguillarum and Vibrio vulnificus infection in European eels (Angullia angullia). FISH & SHELLFISH IMMUNOLOGY 2020; 97:46-57. [PMID: 31846771 DOI: 10.1016/j.fsi.2019.12.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2019] [Revised: 12/08/2019] [Accepted: 12/13/2019] [Indexed: 05/26/2023]
Abstract
In cultivated European eels, Aeromonas hydrophila, Edwardsiella anguillarum and Vibrio vulnificus are three important bacterial pathogens. In this study, European eels (Anguilla anguilla) were immunized by the bivalent expression products of the outer membrane protein (Omp) gene from A. hydrophila (OmpⅡ) and E. anguillarum (OmpA), and the effects of the bivalent protein (rOmpⅡ-A) on the immune function of the European eel were detected. Three hundred eels were divided average into three groups of PBS, adjuvant and rOmp. Eels of three goups were injected intraperitoneal with 0.2 mL of PBS (0.01 mol/L, pH7.4), PBS + F (PBS mixed equal volume of freund's uncomplete adjuvant) or rOmpⅡ-A (1 mg mL-1 rOmpⅡ-A mixed equal volume of freund's uncomplete adjuvant). Four immune-related genes expression, proliferation of whole blood cells, serum and skin mucus antibody titer, superoxide dismutase (SOD) activity and the relative percent of survival (RPS) were studied at different days (or hours) post the immunization. The results showed that the igm, lysC, mhc2 and sod gene in the liver, spleen, kidney and intestine tract were significant increased in the Omp group; On the 28 day post the immunization (dpi), blood cell proliferation was increased in the Omp group, and on the 14, 21, 28 and 42 dpi, antibody titers in serum and mucus of the Omp group were significantly higher than that of the PBS and adjuvant group, regardless of coating with bacteria or Omp antigen. The SOD activity of Omp group increased significantly in liver, kidney, skin mucus and serum from 14 to 42 dpi, especially in serum. Eels chanllenged by A. hydrophila, E. anguillarum and V. vulnificus in the bivalent Omp group showed the RPS were 83.33%, 55.56% and 44.44%, respectively. The results of this study showed that immunization of the bivalent Omp could effectively improve the immune function of European eels, and produced effectively protection to A. hydrophila and E. anguillarum infection. Simultaneously, the bivalent Omp also produced distinct cross-protection to the eels challenged by V. vulnificus.
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Affiliation(s)
- Songlin Guo
- Fisheries College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education, Xiamen, 361021, China
| | - Le He
- Fisheries College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education, Xiamen, 361021, China
| | - Liqun Wu
- College of Overseas Education, Jimei University, Xiamen, 361021, China
| | - Yiqun Xiao
- Fisheries College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education, Xiamen, 361021, China
| | - Shaowei Zhai
- Fisheries College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education, Xiamen, 361021, China
| | - Qinpi Yan
- Fisheries College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education, Xiamen, 361021, China.
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He L, Wu L, Tang Y, Lin P, Zhai S, Xiao Y, Guo S. Immunization of a novel outer membrane protein from Aeromonas hydrophila simultaneously resisting A. hydrophila and Edwardsiella anguillarum infection in European eels (Angullia angullia). FISH & SHELLFISH IMMUNOLOGY 2020; 97:300-312. [PMID: 31866448 DOI: 10.1016/j.fsi.2019.12.060] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 12/13/2019] [Accepted: 12/18/2019] [Indexed: 06/10/2023]
Abstract
In cultivated European eels, Aeromonas hydrophila, Edwardsiella anguillarum and Vibrio vulnificus are three important bacterial pathogens. In this study, an expressed recombinant Outer membrane proteinⅡ (rOmpⅡ) from A. hydrophila was intraperitoneally injected into European eels (Angullia angullia). All examined eels were equally divided into three groups. One group was injected with PBS only (PBS group), one group was injected with 1:1 mixture of PBS and Freund's incomplete adjuvant (PBS + F, adjuvant group), and the third group was injected with 1:1 mixture of 1 mg mL-1 rOmpⅡ and Freund's incomplete adjuvant (rOmpⅡ+F, OmpⅡ group). The immunogenicity of OmpⅡ was studied by detecting the expression of 4 immune-related genes, stimulation index (SI) of the whole blood cell, serum antibody titer, lysozyme and Superoxide Dismutase (SOD) activity, and relative percent of survival (RPS) rate. The results showed that gene expression of MHC-Ⅱ, LysC, SOD and IgM in the OmpⅡ group significantly increased in liver, spleen, kidney and intestine. At 28 days post the immunization (dpi), the SI of whole blood cells in the OmpⅡ group increased significantly; at 14, 21, 28 and 42 dpi, the serum antibody titers against A. hydrophila and E. anguillarum in the OmpⅡ group were significantly higher than that of the PBS and the adjuvant group; the SOD in the OmpⅡ group was found increased significantly in liver, kidney, mucus and serum. On the 28 dpi, eels were challenged by A. hydrophila, E. anguillarum and V. vulnificus for cross protection study. The results showed that the RPS of the OmpⅡ group were 83.33%, 55.56% and 33.33% respectively. These results showed that the expressed OmpⅡ from A. hydrophila significantly improve the immune function of Europena eels and their resistance to the infection of A. hydrophila and E. anguillarum simultaneously.
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Affiliation(s)
- Le He
- Fisheries College of Jimei University, Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education, Xiamen, 361021, China
| | - LiQun Wu
- College of Overseas Education, Jimei University, Xiamen, 361021, China
| | - YiJun Tang
- Yijun Tang, Department of Chemistry, University of Wisconsin Oshkosh, 800 Algoma Blvd., Oshkosh, WI, USA
| | - Peng Lin
- Fisheries College of Jimei University, Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education, Xiamen, 361021, China
| | - ShaoWei Zhai
- Fisheries College of Jimei University, Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education, Xiamen, 361021, China
| | - YiQun Xiao
- Fisheries College of Jimei University, Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education, Xiamen, 361021, China
| | - SongLin Guo
- Fisheries College of Jimei University, Engineering Research Center of the Modern Industry Technology for Eel, Ministry of Education, Xiamen, 361021, China.
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Hernández-Cabanyero C, Lee CT, Tolosa-Enguis V, Sanjuán E, Pajuelo D, Reyes-López F, Tort L, Amaro C. Adaptation to host in Vibrio vulnificus, a zoonotic pathogen that causes septicemia in fish and humans. Environ Microbiol 2019; 21:3118-3139. [PMID: 31206984 DOI: 10.1111/1462-2920.14714] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 06/10/2019] [Accepted: 06/10/2019] [Indexed: 12/18/2022]
Abstract
Vibrio vulnificus is a siderophilic pathogen spreading due to global warming. The zoonotic strains constitute a clonal-complex related to fish farms that are distributed worldwide. In this study, we applied a transcriptomic and single gene approach and discover that the zoonotic strains bypassed the iron requirement of the species thanks to the acquisition of two iron-regulated outer membrane proteins (IROMPs) involved in resistance to fish innate immunity. Both proteins have been acquired by horizontal gene transfer and are contributing to the successful spreading of this clonal-complex. We have also discovered that the zoonotic strains express a virulent phenotype in the blood of its main susceptible hosts (iron-overloaded humans and healthy eels) by combining a host-specific protective envelope with the common expression of two toxins (VvhA and RtxA1), one of which (RtxA1) is directly involved in sepsis. Finally, we found that both IROMPs are also present in other fish pathogenic species and have recently been transmitted to the phylogenetic lineage involved in human primary sepsis after raw seafood ingestion. Together our results highlight the potential hazard that the aquaculture industry poses to public health, which is of particular relevance in the context of a warming world.
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Affiliation(s)
| | - Chung-Te Lee
- Department of Microbiology and Immunology, College of Medicine, National Cheng Kung University, Tainan, Taiwan
| | | | - Eva Sanjuán
- ERI-Biotecmed, University of Valencia, Dr. Moliner, 50, 46100, Valencia, Spain
| | - David Pajuelo
- ERI-Biotecmed, University of Valencia, Dr. Moliner, 50, 46100, Valencia, Spain
| | - Felipe Reyes-López
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain
| | - Lluis Tort
- Department of Cell Biology, Physiology and Immunology, Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain
| | - Carmen Amaro
- ERI-Biotecmed, University of Valencia, Dr. Moliner, 50, 46100, Valencia, Spain
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26
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Matanza XM, Osorio CR. Transcriptome changes in response to temperature in the fish pathogen Photobacterium damselae subsp. damselae: Clues to understand the emergence of disease outbreaks at increased seawater temperatures. PLoS One 2018; 13:e0210118. [PMID: 30596794 PMCID: PMC6312309 DOI: 10.1371/journal.pone.0210118] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Accepted: 12/17/2018] [Indexed: 01/22/2023] Open
Abstract
The marine bacterium Photobacterium damselae subsp. damselae (Pdd) is a generalist and facultative pathogen that causes disease in a wide range of marine animals including fish species of importance in aquaculture. Disease outbreaks in fish farms have been correlated with an increased water temperature during summer months. In this study, we have used RNA sequencing to analyze the transcriptome of Pdd RM-71 cultured at two different temperatures, which simulated temperature conditions experienced during free swimming lifestyle at mid latitudes in winter months (15°C) and during outbreaks in aquaculture in warm summer months (25°C). The enhanced bacterial growth of Pdd observed at 25°C in comparison to 15°C suggests that an elevated seawater temperature contributes to the build-up of a sufficient bacterial population to cause disease. In comparison to growth at 15°C, growth at 25°C resulted in the upregulation of genes involved in DNA synthesis, nutrient uptake, chemotaxis, flagellar motility, secretion systems and antimicrobial resistance. Plasmid-encoded virulence factors, which include a putative adhesin/invasin OmpU, a transferrin receptor and a serum resistance protein, were also upregulated. Transcription factor RpoS, genes involved in cold shock response, modulation of cell envelope and amino acid metabolism, as well as genes of yet unknown function were downregulated at 25°C. Notably, the gene encoding damselysin cytotoxin (Dly) was among the most highly transcribed genes at the two assayed temperatures, at levels comparable to the most highly expressed housekeeping genes. This study contributes to our understanding of the regulatory networks and biology of a generalist marine bacterial pathogen, and provides evidence that temperature regulates multiple physiological and virulence-related functions in Pdd.
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Affiliation(s)
- Xosé M. Matanza
- Departamento de Microbioloxía e Parasitoloxía, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
| | - Carlos R. Osorio
- Departamento de Microbioloxía e Parasitoloxía, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela, Spain
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27
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Yan W, Gu L, Liu S, Ren W, Lyu M, Wang S. Identification of a highly specific DNA aptamer for Vibrio vulnificus using systematic evolution of ligands by exponential enrichment coupled with asymmetric PCR. JOURNAL OF FISH DISEASES 2018; 41:1821-1829. [PMID: 30270541 DOI: 10.1111/jfd.12891] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 08/06/2018] [Accepted: 08/07/2018] [Indexed: 05/18/2023]
Abstract
Vibrio vulnificus is an important bacterial pathogen that causes serious infections in fish and is also highly pathogenic to humans. Many effective detection methods targeting this pathogen have previously been designed, but many of these methods are time-consuming, complicated and expensive. Thus, these approaches cannot be widely used by small aqacultural concerns. Although DNA aptamers have been used to detect pathogenic bacteria, these have not been applied to marine bacteria, including V. vulnificus. Therefore, we developed a highly specific DNA aptamer for V. vulnificus detection using systematic evolution of ligands by exponential enrichment (SELEX), coupled with asymmetric PCR. After 13 rounds of cross-selection, we identified a novel DNA aptamer (Vapt2). We evaluated the affinity, specificity and limit of detection (LOD) of this aptamer for V. vulnificus. We found that Vapt2 had a high affinity for V. vulnificus (Kd = 26.8 ± 5.3 nM) and detected this pathogen at a wide range of concentrations (8-2.0 × 108 cfu/ml). Vapt2 bound to V. vulnificus with high selectivity in the presence of other pathogenic bacteria. Our study increases our knowledge of the possible applications of aptamers with respect to marine bacteria. Moreover, our work might provide a framework for the rapid detection of pathogenic bacteria and water pollution.
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Affiliation(s)
- Wanli Yan
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Huaihai Institute of Technology, Lianyungang, China
- Jiangsu Marine Resources Development Research Institute, Lianyungang, China
- College of Marine Life and Fisheries, Huaihai Institute of Technology, Lianyungang, China
- Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Huaihai Institute of Technology, Lianyungang, China
| | - Lide Gu
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Huaihai Institute of Technology, Lianyungang, China
- Jiangsu Marine Resources Development Research Institute, Lianyungang, China
- College of Marine Life and Fisheries, Huaihai Institute of Technology, Lianyungang, China
- Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Huaihai Institute of Technology, Lianyungang, China
| | - Shu Liu
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Huaihai Institute of Technology, Lianyungang, China
- Jiangsu Marine Resources Development Research Institute, Lianyungang, China
- College of Marine Life and Fisheries, Huaihai Institute of Technology, Lianyungang, China
- Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Huaihai Institute of Technology, Lianyungang, China
| | - Wei Ren
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Huaihai Institute of Technology, Lianyungang, China
- Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Huaihai Institute of Technology, Lianyungang, China
- Key Laboratory of Marine Biology, Nanjing Agricultural University, Nanjing, China
| | - Mingsheng Lyu
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Huaihai Institute of Technology, Lianyungang, China
- Jiangsu Marine Resources Development Research Institute, Lianyungang, China
- College of Marine Life and Fisheries, Huaihai Institute of Technology, Lianyungang, China
- Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Huaihai Institute of Technology, Lianyungang, China
| | - Shujun Wang
- Jiangsu Key Laboratory of Marine Bioresources and Environment, Huaihai Institute of Technology, Lianyungang, China
- Jiangsu Marine Resources Development Research Institute, Lianyungang, China
- College of Marine Life and Fisheries, Huaihai Institute of Technology, Lianyungang, China
- Co-Innovation Center of Jiangsu Marine Bio-industry Technology, Huaihai Institute of Technology, Lianyungang, China
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Carda-Diéguez M, Silva-Hernández FX, Hubbard TP, Chao MC, Waldor MK, Amaro C. Comprehensive identification of Vibrio vulnificus genes required for growth in human serum. Virulence 2018; 9:981-993. [PMID: 29697309 PMCID: PMC6037467 DOI: 10.1080/21505594.2018.1455464] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Vibrio vulnificus can be a highly invasive pathogen capable of spreading from an infection site to the bloodstream, causing sepsis and death. To survive and proliferate in blood, the pathogen requires mechanisms to overcome the innate immune defenses and metabolic limitations of this host niche. We created a high-density transposon mutant library in YJ016, a strain representative of the most virulent V. vulnificus lineage (or phylogroup) and used transposon insertion sequencing (TIS) screens to identify loci that enable the pathogen to survive and proliferate in human serum. Initially, genes underrepresented for insertions were used to estimate the V. vulnificus essential gene set; comparisons of these genes with similar TIS-based classification of underrepresented genes in other vibrios enabled the compilation of a common Vibrio essential gene set. Analysis of the relative abundance of insertion mutants in the library after exposure to serum suggested that genes involved in capsule biogenesis are critical for YJ016 complement resistance. Notably, homologues of two genes required for YJ016 serum-resistance and capsule biogenesis were not previously linked to capsule biogenesis and are largely absent from other V. vulnificus strains. The relative abundance of mutants after exposure to heat inactivated serum was compared with the findings from the serum screen. These comparisons suggest that in both conditions the pathogen relies on its Na+ transporting NADH-ubiquinone reductase (NQR) complex and type II secretion system to survive/proliferate within the metabolic constraints of serum. Collectively, our findings reveal the potency of comparative TIS screens to provide knowledge of how a pathogen overcomes the diverse limitations to growth imposed by serum.
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Affiliation(s)
- M Carda-Diéguez
- a Department of Microbiology and Ecology , University of Valencia. Dr. Moliner 50 , Burjassot , Spain.,b ERI BIOTECMED , Universitat de València. Dr Moliner 50 , Burjassot , Spain
| | - F X Silva-Hernández
- a Department of Microbiology and Ecology , University of Valencia. Dr. Moliner 50 , Burjassot , Spain
| | - T P Hubbard
- c Division of Infectious Disease , Brigham and Women's Hospital , Boston , Massachusetts , United States of America.,e Department of Microbiology and Immunobiology , Harvard Medical School , Boston , Massachusetts , United States of America
| | - M C Chao
- c Division of Infectious Disease , Brigham and Women's Hospital , Boston , Massachusetts , United States of America.,d Howard Hughes Medical Institute , Boston , Massachusetts , United States of America.,e Department of Microbiology and Immunobiology , Harvard Medical School , Boston , Massachusetts , United States of America
| | - M K Waldor
- c Division of Infectious Disease , Brigham and Women's Hospital , Boston , Massachusetts , United States of America.,d Howard Hughes Medical Institute , Boston , Massachusetts , United States of America.,e Department of Microbiology and Immunobiology , Harvard Medical School , Boston , Massachusetts , United States of America
| | - C Amaro
- a Department of Microbiology and Ecology , University of Valencia. Dr. Moliner 50 , Burjassot , Spain.,b ERI BIOTECMED , Universitat de València. Dr Moliner 50 , Burjassot , Spain
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29
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Le H, LiHua D, JianJun F, Peng L, SongLin G. Immunogenicity study of an expressed outer membrane protein U of Vibrio vulnificus in Japanese eel (Anguilla japonica). J Appl Microbiol 2018; 125:1642-1654. [PMID: 30106200 DOI: 10.1111/jam.14068] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Revised: 07/27/2018] [Accepted: 08/07/2018] [Indexed: 12/23/2022]
Abstract
AIMS Vibrio vulnificus is a common bacterial pathogen causing haemorrhagic septicaemia in eel farming. This study investigates the immunogenicity of an outer membrane protein U (OmpU) of V. vulnificus and the feasibility of the protein as a new subunit vaccine against V. vulnificus. METHODS AND RESULTS Partial gene sequence of the OmpU of V. vulnificus was cloned, and then the OmpU was expressed and purified. Three groups of Japanese eels (Anguilla japonica) were intraperitoneally (i.p) injected with bovine serum albumin (BSA group), formalin-killed whole cell of V. vulnificus (FKC group) or the expressed OmpU of V. vulnificus (OMP group). On 14, 21, 28 and 42 days postimmunization (dpi), the whole blood cells were collected to evaluate the stimulation index (SI) and bactericidal activity. The serum was obtained to assess the titres of specific antibody, lysozyme activity, complement activity and bactericidal activity. The lysozyme activities in the suspension of kidney, skin mucus and liver in eels were also ascertained. The results showed that the SI and the titres of anti-V. vulnificus antibody in the OMP group was significantly increased on 28 dpi; lysozyme activity in the kidney and skin mucus of OMP group on 42 and 14 dpi were both significantly higher than BSA group; eels in OMP group showed strong bactericidal capacity on 21 and 28 days; and the relative percent survival of OMP vs BSA group after challenged by V. vulnificus on 28 dpi was 80%. CONCLUSIONS These results showed that the expressed OmpU of V. vulnificus could significantly improve the immune function of Japanese eel and the resistance of eels to the infection of V. vulnificus. SIGNIFICANCE AND IMPACT OF THE STUDY This study offered an alternative preliminary strategy of making aquaculture vaccines against V. vulnificus for eel farming.
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Affiliation(s)
- H Le
- Fishery College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education, Xiamen, China
| | - D LiHua
- Fishery College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education, Xiamen, China
| | - F JianJun
- Fishery College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education, Xiamen, China
| | - L Peng
- Fishery College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education, Xiamen, China
| | - G SongLin
- Fishery College of Jimei University/Engineering Research Center of the Modern Industry Technology for Eel. Ministry of Education, Xiamen, China
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30
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Abstract
Vibrio is a genus of ubiquitous heterotrophic bacteria found in aquatic environments. Although they are a small percentage of the bacteria in these environments, vibrios can predominate during blooms. Vibrios also play important roles in the degradation of polymeric substances, such as chitin, and in other biogeochemical processes. Vibrios can be found as free-living bacteria, attached to particles, or associated with other organisms in a mutualistic, commensal, or pathogenic relationship. This review focuses on vibrio ecology and genome plasticity, which confers an ability to adapt to new niches and is driven, at least in part, by horizontal gene transfer (HGT). The extent of HGT and its role in pathogen emergence are discussed based on genomic studies of environmental and pathogenic vibrios, mobile genetically encoded virulence factors, and mechanistic studies on the different modes of HGT.
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Affiliation(s)
- Frédérique Le Roux
- Ifremer, Unité Physiologie Fonctionnelle des Organismes Marins, F-29280 Plouzané, France.,Laboratoire de Biologie Intégrative des Modèles Marins, Station Biologique de Roscoff, CNRS UMR 8227, UPMC Paris 06, Sorbonne Universités, F-29688 Roscoff CEDEX, France;
| | - Melanie Blokesch
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;
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31
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Zhang YJ, Lin H, Wang P, Chen C, Chen S. Subcellular localisation of lipoproteins of Vibrio vulnificus by the identification of outer membrane vesicles components. Antonie van Leeuwenhoek 2018; 111:1985-1997. [PMID: 29721710 DOI: 10.1007/s10482-018-1092-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2018] [Accepted: 04/26/2018] [Indexed: 12/17/2022]
Abstract
Vibrio vulnificus, a Gram-negative halophilic bacterium, is an opportunistic human pathogen that is responsible for the majority of seafood-associated deaths worldwide. Lipoproteins are important components of the bacterial cell envelope and have been shown to be involved in a wide variety of cellular processes. Little is known about the localisation or transport mechanism of lipoproteins in V. vulnificus. To assess the localisation of lipoproteins in V. vulnificus, we tested two established techniques for the rapid separation of membrane-associated proteins: detergent extraction with Sarkosyl and outer membrane vesicles (OMVs) preparation. The results showed that Sarkosyl extraction was not useful for the separation of lipoproteins from the different membranes of V. vulnificus. On the other hand, we confirmed that OMVs produced by V. vulnificus contained lipoproteins from the outer but not the inner membrane. Analysis of the OMVs components confirmed the localisation of several well-known lipoproteins to membranes that were different from expected, based on their predicted functions. Using this technique, we found that Asp at position +2 of mature lipoproteins can function as an inner membrane retention signal in V. vulnificus. Interestingly, the Escherichia coli "+2 rule" does not apply to the V. vulnificus lipoprotein IlpA (G2D) mutant, as a Ser to Asp mutation at position +2 of IlpA did not affect its outer membrane localisation. Furthermore, an IlpA tether-mRFP chimeric lipoprotein and its G2D mutant also behaved like IlpA. Together, these results suggest that the sorting rule of lipoproteins in V. vulnificus might be different from that in E. coli.
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Affiliation(s)
- Yan-Jiao Zhang
- Shandong Province Key Laboratory of Applied Mycology, School of Life Sciences, Qingdao Agricultural University, Shandong, 266109, China
| | - Huiyuan Lin
- Shandong Province Key Laboratory of Applied Mycology, School of Life Sciences, Qingdao Agricultural University, Shandong, 266109, China
| | - Pan Wang
- Shandong Province Key Laboratory of Applied Mycology, School of Life Sciences, Qingdao Agricultural University, Shandong, 266109, China
| | - Chang Chen
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Chinese Academy of Sciences, Guangzhou, 510301, China
| | - Shiyong Chen
- Shandong Province Key Laboratory of Applied Mycology, School of Life Sciences, Qingdao Agricultural University, Shandong, 266109, China.
- Shandong Engineering Research Center for Aquatic Animal Immune Preparation, Marine Science and Engineering College, Qingdao Agricultural University, Shandong, 266109, China.
- Key Laboratory of Tropical Marine Bio-resources and Ecology, Chinese Academy of Sciences, Guangzhou, 510301, China.
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32
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Roig FJ, González-Candelas F, Sanjuán E, Fouz B, Feil EJ, Llorens C, Baker-Austin C, Oliver JD, Danin-Poleg Y, Gibas CJ, Kashi Y, Gulig PA, Morrison SS, Amaro C. Phylogeny of Vibrio vulnificus from the Analysis of the Core-Genome: Implications for Intra-Species Taxonomy. Front Microbiol 2018; 8:2613. [PMID: 29358930 PMCID: PMC5765525 DOI: 10.3389/fmicb.2017.02613] [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: 10/13/2017] [Accepted: 12/14/2017] [Indexed: 01/22/2023] Open
Abstract
Vibrio vulnificus (Vv) is a multi-host pathogenic species currently subdivided into three biotypes (Bts). The three Bts are human-pathogens, but only Bt2 is also a fish-pathogen, an ability that is conferred by a transferable virulence-plasmid (pVvbt2). Here we present a phylogenomic analysis from the core genome of 80 Vv strains belonging to the three Bts recovered from a wide range of geographical and ecological sources. We have identified five well-supported phylogenetic groups or lineages (L). L1 comprises a mixture of clinical and environmental Bt1 strains, most of them involved in human clinical cases related to raw seafood ingestion. L2 is formed by a mixture of Bt1 and Bt2 strains from various sources, including diseased fish, and is related to the aquaculture industry. L3 is also linked to the aquaculture industry and includes Bt3 strains exclusively, mostly related to wound infections or secondary septicemia after farmed-fish handling. Lastly, L4 and L5 include a few strains of Bt1 associated with specific geographical areas. The phylogenetic trees for ChrI and II are not congruent to one another, which suggests that inter- and/or intra-chromosomal rearrangements have been produced along Vv evolution. Further, the phylogenetic trees for each chromosome and the virulence plasmid were also not congruent, which also suggests that pVvbt2 has been acquired independently by different clones, probably in fish farms. From all these clones, the one with zoonotic capabilities (Bt2-Serovar E) has successfully spread worldwide. Based on these results, we propose a new updated classification of the species based on phylogenetic lineages rather than on Bts, as well as the inclusion of all Bt2 strains in a pathovar with the particular ability to cause fish vibriosis, for which we suggest the name "piscis."
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Affiliation(s)
- Francisco J Roig
- Estructura de Investigación Interdisciplinar en Biotecnología y Biomedicina BIOTECMED, University of Valencia, Valencia, Spain.,Departmento de Microbiología y Ecología, Universidad de Valencia, Valencia, Spain.,Biotechvana, Parc Cientific, Universitat de Valencia, Valencia, Spain
| | - Fernando González-Candelas
- Joint Research Unit on Infection and Public Health FISABIO-Salud Pública and Universitat de Valencia-I2SysBio, Valencia, Spain.,CIBEResp, National Network Center for Research on Epidemiology and Public Health, Instituto de Salud Carlos III, Valencia, Spain
| | - Eva Sanjuán
- Estructura de Investigación Interdisciplinar en Biotecnología y Biomedicina BIOTECMED, University of Valencia, Valencia, Spain.,Departmento de Microbiología y Ecología, Universidad de Valencia, Valencia, Spain
| | - Belén Fouz
- Estructura de Investigación Interdisciplinar en Biotecnología y Biomedicina BIOTECMED, University of Valencia, Valencia, Spain.,Departmento de Microbiología y Ecología, Universidad de Valencia, Valencia, Spain
| | - Edward J Feil
- Department of Biology and Biochemistry, University of Bath, Bath, United Kingdom
| | - Carlos Llorens
- Biotechvana, Parc Cientific, Universitat de Valencia, Valencia, Spain
| | - Craig Baker-Austin
- Centre for Environment, Fisheries and Aquaculture Science, Weymouth, United Kingdom
| | - James D Oliver
- Department of Biological Sciences, University of North Carolina at Charlotte, Charlotte, NC, United States.,Duke University Marine Lab, Beaufort, NC, United States
| | - Yael Danin-Poleg
- Faculty of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Cynthia J Gibas
- Department of Bioinformatics and Genomics, the University of North Carolina at Charlotte, Charlotte, NC, United States
| | - Yechezkel Kashi
- Faculty of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Paul A Gulig
- Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, FL, United States
| | - Shatavia S Morrison
- Department of Bioinformatics and Genomics, the University of North Carolina at Charlotte, Charlotte, NC, United States
| | - Carmen Amaro
- Estructura de Investigación Interdisciplinar en Biotecnología y Biomedicina BIOTECMED, University of Valencia, Valencia, Spain.,Departmento de Microbiología y Ecología, Universidad de Valencia, Valencia, Spain
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Carda-Diéguez M, Ghai R, Rodríguez-Valera F, Amaro C. Wild eel microbiome reveals that skin mucus of fish could be a natural niche for aquatic mucosal pathogen evolution. MICROBIOME 2017; 5:162. [PMID: 29268781 PMCID: PMC5740887 DOI: 10.1186/s40168-017-0376-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 11/21/2017] [Indexed: 05/21/2023]
Abstract
BACKGROUND Fish skin mucosal surfaces (SMS) are quite similar in composition and function to some mammalian MS and, in consequence, could constitute an adequate niche for the evolution of mucosal aquatic pathogens in natural environments. We aimed to test this hypothesis by searching for metagenomic and genomic evidences in the SMS-microbiome of a model fish species (Anguilla Anguilla or eel), from different ecosystems (four natural environments of different water salinity and one eel farm) as well as the water microbiome (W-microbiome) surrounding the host. RESULTS Remarkably, potentially pathogenic Vibrio monopolized wild eel SMS-microbiome from natural ecosystems, Vibrio anguillarum/Vibrio vulnificus and Vibrio cholerae/Vibrio metoecus being the most abundant ones in SMS from estuary and lake, respectively. Functions encoded in the SMS-microbiome differed significantly from those in the W-microbiome and allowed us to predict that successful mucus colonizers should have specific genes for (i) attachment (mainly by forming biofilms), (ii) bacterial competence and communication, and (iii) resistance to mucosal innate immunity, predators (amoeba), and heavy metals/drugs. In addition, we found several mobile genetic elements (mainly integrative conjugative elements) as well as a series of evidences suggesting that bacteria exchange DNA in SMS. Further, we isolated and sequenced a V. metoecus strain from SMS. This isolate shares pathogenicity islands with V. cholerae O1 from intestinal infections that are absent in the rest of sequenced V. metoecus strains, all of them from water and extra-intestinal infections. CONCLUSIONS We have obtained metagenomic and genomic evidence in favor of the hypothesis on the role of fish mucosal surfaces as a specialized habitat selecting microbes capable of colonizing and persisting on other comparable mucosal surfaces, e.g., the human intestine.
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Affiliation(s)
- Miguel Carda-Diéguez
- Department of Microbiology and Ecology abd Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED), University of Valencia, Valencia, Spain
| | - Rohit Ghai
- Institute of Hydrobiology, Department of Aquatic Microbial Ecology, Biology Center of the Academy of Sciences of the Czech Republic, České Budějovice, Czech Republic
| | - Francisco Rodríguez-Valera
- Evolutionary Genomics Group, Department de Producción Vegetal y Microbiología, Universidad Miguel Hernández, San Juan de Alicante, Spain
| | - Carmen Amaro
- Department of Microbiology and Ecology abd Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED), University of Valencia, Valencia, Spain.
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Murciano C, Lee CT, Fernández-Bravo A, Hsieh TH, Fouz B, Hor LI, Amaro C. MARTX Toxin in the Zoonotic Serovar of Vibrio vulnificus Triggers an Early Cytokine Storm in Mice. Front Cell Infect Microbiol 2017; 7:332. [PMID: 28775962 PMCID: PMC5517466 DOI: 10.3389/fcimb.2017.00332] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Accepted: 07/05/2017] [Indexed: 12/18/2022] Open
Abstract
Vibrio vulnificus biotype 2-serovar E is a zoonotic clonal complex that can cause death by sepsis in humans and fish. Unlike other biotypes, Bt2 produces a unique type of MARTXVv (Multifunctional-Autoprocessive-Repeats-in-Toxin; RtxA13), which is encoded by a gene duplicated in the pVvBt2 plasmid and chromosome II. In this work, we analyzed the activity of this toxin and its role in human sepsis by performing in vitro, ex vivo, and in vivo assays. First, we demonstrated that the ACD domain, present exclusively in this toxin variant, effectively has an actin-cross-linking activity. Second, we determined that the whole toxin caused death of human endotheliocytes and monocytes by lysis and apoptosis, respectively. Finally, we tested the hypothesis that RtxA13 contributes to human death caused by this zoonotic serovar by triggering an early cytokine storm in blood. To this end, we used a Bt2-SerE strain (R99) together with its rtxA13 deficient mutant, and a Bt1 strain (YJ016) producing RtxA11 (the most studied MARTXVv) together with its rtxA11 deficient mutant, as controls. Our results showed that RtxA13 was essential for virulence, as R99ΔΔrtxA13 was completely avirulent in our murine model of infection, and that R99, but not strain YJ016, induced an early, strong and dysregulated immune response involving the up-regulation of a high number of genes. This dysregulated immune response was directly linked to RtxA13. Based on these results and those obtained ex vivo (human blood), we propose a model of infection for the zoonotic serovar of V. vulnificus, in which RtxA13 would act as a sepsis-inducing toxin.
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Affiliation(s)
- Celia Murciano
- Departamento de Microbiología y Ecología & Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina, Universitat de ValènciaValencia, Spain
| | - Chung-Te Lee
- Department of Microbiology & Immunology & College of Medicine, National Cheng Kung UniversityTainan, Taiwan
| | - Ana Fernández-Bravo
- Departamento de Microbiología y Ecología & Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina, Universitat de ValènciaValencia, Spain
| | - Tsung-Han Hsieh
- Department of Microbiology & Immunology & College of Medicine, National Cheng Kung UniversityTainan, Taiwan
| | - Belén Fouz
- Departamento de Microbiología y Ecología & Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina, Universitat de ValènciaValencia, Spain
| | - Lien-I Hor
- Department of Microbiology & Immunology & College of Medicine, National Cheng Kung UniversityTainan, Taiwan.,Institute of Basic Medical Sciences, College of Medicine, National Cheng Kung UniversityTainan, Taiwan
| | - Carmen Amaro
- Departamento de Microbiología y Ecología & Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina, Universitat de ValènciaValencia, Spain
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Pajuelo D, Hernández-Cabanyero C, Sanjuan E, Lee CT, Silva-Hernández FX, Hor LI, MacKenzie S, Amaro C. Iron and Fur in the life cycle of the zoonotic pathogenVibrio vulnificus. Environ Microbiol 2016; 18:4005-4022. [DOI: 10.1111/1462-2920.13424] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Accepted: 06/17/2016] [Indexed: 11/29/2022]
Affiliation(s)
- David Pajuelo
- Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED); University of Valencia; Dr. Moliner, 50 Valencia 46100 Spain
| | - Carla Hernández-Cabanyero
- Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED); University of Valencia; Dr. Moliner, 50 Valencia 46100 Spain
| | - Eva Sanjuan
- Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED); University of Valencia; Dr. Moliner, 50 Valencia 46100 Spain
| | - Chung-Te Lee
- Department of Microbiology and Immunology; Institute of Basic Medical Sciences; Tainan Taiwan Republic of China
| | - Francisco Xavier Silva-Hernández
- Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED); University of Valencia; Dr. Moliner, 50 Valencia 46100 Spain
| | - Lien-I Hor
- Department of Microbiology and Immunology; Institute of Basic Medical Sciences; Tainan Taiwan Republic of China
- College of Medicine; National Cheng Kung University; Tainan 701 Taiwan Republic of China
| | - Simon MacKenzie
- Institute of Aquaculture; University of Stirling; Stirling UK
| | - Carmen Amaro
- Estructura de Recerca Interdisciplinar en Biotecnologia i Biomedicina (ERI BIOTECMED); University of Valencia; Dr. Moliner, 50 Valencia 46100 Spain
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Pathogenic Mechanisms of Actin Cross-Linking Toxins: Peeling Away the Layers. Curr Top Microbiol Immunol 2016; 399:87-112. [PMID: 27858184 DOI: 10.1007/82_2016_22] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Actin cross-linking toxins are produced by Gram-negative bacteria from Vibrio and Aeromonas genera. The toxins were named actin cross-linking domains (ACD), since the first and most of the subsequently discovered ACDs were found as effector domains in larger MARTX and VgrG toxins. Among recognized human pathogens, ACD is produced by Vibrio cholerae, Vibrio vulnificus, and Aeromonas hydrophila. Upon delivery to the cytoplasm of a host cell, ACD covalently cross-links actin monomers into non-polymerizable actin oligomers of various lengths. Provided sufficient doses of toxin are delivered, most or all actin can be promptly cross-linked into non-functional oligomers, leading to cell rounding, detachment from the substrate and, in many cases, cell death. Recently, a deeper layer of ACD toxicity with a less obvious but more potent mechanism was discovered. According to this finding, low doses of the ACD-produced actin oligomers can actively disrupt the actin cytoskeleton by potently inhibiting essential actin assembly proteins, formins. The first layer of toxicity is direct (as actin is the immediate and the only target), passive (since ACD-cross-linked actin oligomers are toxic only because they are non-functional), and less potent (as bulk quantities of one of the most abundant cytoplasmic proteins, actin, have to be modified). The second mechanism is indirect (as major targets, formins, are not affected by ACD directly), active (because actin oligomers act as "secondary" toxins), and highly potent [as it affects scarce and essential actin-binding proteins (ABPs)].
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Gavin HE, Satchell KJF. MARTX toxins as effector delivery platforms. Pathog Dis 2015; 73:ftv092. [PMID: 26472741 DOI: 10.1093/femspd/ftv092] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/07/2015] [Indexed: 12/14/2022] Open
Abstract
Bacteria frequently manipulate their host environment via delivery of microbial 'effector' proteins to the cytosol of eukaryotic cells. In the case of the multifunctional autoprocessing repeats-in-toxins (MARTX) toxin, this phenomenon is accomplished by a single, >3500 amino acid polypeptide that carries information for secretion, translocation, autoprocessing and effector activity. MARTX toxins are secreted from bacteria by dedicated Type I secretion systems. The released MARTX toxins form pores in target eukaryotic cell membranes for the delivery of up to five cytopathic effectors, each of which disrupts a key cellular process. Targeted cellular processes include modulation or modification of small GTPases, manipulation of host cell signaling and disruption of cytoskeletal integrity. More recently, MARTX toxins have been shown to be capable of heterologous protein translocation. Found across multiple bacterial species and genera--frequently in pathogens lacking Type 3 or Type 4 secretion systems--MARTX toxins in multiple cases function as virulence factors. Innovative research at the intersection of toxin biology and bacterial genetics continues to elucidate the intricacies of the toxin as well as the cytotoxic mechanisms of its diverse effector collection.
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Affiliation(s)
- Hannah E Gavin
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
| | - Karla J F Satchell
- Department of Microbiology-Immunology, Feinberg School of Medicine, Northwestern University, Chicago, IL 60611, USA
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Le Roux F, Wegner KM, Baker-Austin C, Vezzulli L, Osorio CR, Amaro C, Ritchie JM, Defoirdt T, Destoumieux-Garzón D, Blokesch M, Mazel D, Jacq A, Cava F, Gram L, Wendling CC, Strauch E, Kirschner A, Huehn S. The emergence of Vibrio pathogens in Europe: ecology, evolution, and pathogenesis (Paris, 11-12th March 2015). Front Microbiol 2015; 6:830. [PMID: 26322036 PMCID: PMC4534830 DOI: 10.3389/fmicb.2015.00830] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 07/28/2015] [Indexed: 02/02/2023] Open
Abstract
Global change has caused a worldwide increase in reports of Vibrio-associated diseases with ecosystem-wide impacts on humans and marine animals. In Europe, higher prevalence of human infections followed regional climatic trends with outbreaks occurring during episodes of unusually warm weather. Similar patterns were also observed in Vibrio-associated diseases affecting marine organisms such as fish, bivalves and corals. Basic knowledge is still lacking on the ecology and evolutionary biology of these bacteria as well as on their virulence mechanisms. Current limitations in experimental systems to study infection and the lack of diagnostic tools still prevent a better understanding of Vibrio emergence. A major challenge is to foster cooperation between fundamental and applied research in order to investigate the consequences of pathogen emergence in natural Vibrio populations and answer federative questions that meet societal needs. Here we report the proceedings of the first European workshop dedicated to these specific goals of the Vibrio research community by connecting current knowledge to societal issues related to ocean health and food security.
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Affiliation(s)
- Frédérique Le Roux
- Unié Physiologie Fonctionnelle des Organismes Marins, Ifremer , Plouzané, France ; CNRS, UMR 8227, Integrative Biology of Marine Models, Station Biologique de Roscoff, Sorbonne Universités, UPMC Paris 06 , Roscoff cedex, France
| | - K Mathias Wegner
- Coastal Ecology, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research , List, Germany
| | | | - Luigi Vezzulli
- Department of Earth, Environmental and Life Sciences, University of Genoa , Genoa, Italy
| | - Carlos R Osorio
- Departamento de Microbioloxía e Parasitoloxía, Instituto de Acuicultura, Universidade de Santiago de Compostela , Santiago de Compostela, Spain
| | - Carmen Amaro
- Estructura de Investigación Interdisciplinar en Biotecnología y Biomedicina, Department of Microbiology and Ecology, University of Valencia , Valencia, Spain
| | - Jennifer M Ritchie
- Faculty of Health and Medical Sciences, University of Surrey , Guildford, UK
| | - Tom Defoirdt
- UGent Aquaculture R&D Consortium, Ghent University , Ghent, Belgium
| | - Delphine Destoumieux-Garzón
- Interactions Hôtes-Pathogènes-Environnements, UMR 5244, CNRS, Ifremer, Université de Perpignan Via Domita, Université de Montpellier , Montpellier, France
| | - Melanie Blokesch
- Laboratory of Molecular Microbiology, Global Health Institute, School of Life Sciences, Ecole Polytechnique Fédérale de Lausanne , Lausanne, Switzerland
| | - Didier Mazel
- Département Génomes et Génétique, CNRS UMR3525, Unité Plasticité du Génome Bactérien, Institut Pasteur , Paris, France
| | - Annick Jacq
- Institute for Integrative Biology of the Cell, CEA, CNRS, Université Paris-Sud , Orsay, France
| | - Felipe Cava
- Laboratory for Molecular Infection Medicine Sweden, Department of Molecular Biology, Umeå Centre for Microbial Research, Umeå University , Umeå, Sweden
| | - Lone Gram
- Department of Systems Biology, Technical University of Denmark , Kongens Lyngby, Denmark
| | | | - Eckhard Strauch
- Federal Institute for Risk Assessment, National Reference Laboratory for Monitoring Bacteriological Contamination of Bivalve Molluscs , Berlin, Germany
| | - Alexander Kirschner
- Institute for Hygiene and Applied Immunology, Medical University of Vienna , Vienna, Austria
| | - Stephan Huehn
- Institute of Food Hygiene, Free University Berlin , Berlin, Germany
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