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https://www.readbyqxmd.com/read/30097682/simulated-marine-heat-wave-alters-abundance-and-structure-of-vibrio-populations-associated-with-the-pacific-oyster-resulting-in-a-mass-mortality-event
#1
Timothy J Green, Nachshon Siboni, William L King, Maurizio Labbate, Justin R Seymour, David Raftos
Marine heat waves are predicted to become more frequent and intense due to anthropogenically induced climate change, which will impact global production of seafood. Links between rising seawater temperature and disease have been documented for many aquaculture species, including the Pacific oyster Crassostrea gigas. The oyster harbours a diverse microbial community that may act as a source of opportunistic pathogens during temperature stress. We rapidly raised the seawater temperature from 20 °C to 25 °C resulting in an oyster mortality rate of 77...
August 10, 2018: Microbial Ecology
https://www.readbyqxmd.com/read/30092256/identification-and-characterization-of-a-novel-prr-of-fibrinogen-related-protein-in-apostichopus-japonicus
#2
Liting Jiang, Yina Shao, Ronglian Xing, Chenghua Li, Yi Cui, Weiwei Zhang, Xuelin Zhao
Fibrinogen-related proteins (FREPs) play important roles in innate immunity by recognizing pathogen associated molecular patterns on pathogenic bacteria surfaces via conserved fibrinogen-like domain (FBG). In this paper, the full-length cDNA of Apostichopus japonicus FREP (designated as AjFREP) was cloned combined with rapid amplification of cDNA ends (RACE) and transcriptome sequencing. The full-length cDNA of AjFREP was of 2110 bp with an open reading frame (ORF) of 1659 bp. SMART analysis revealed that the AjFREP contained a typical signal peptide of 19 amino acid residues, a FBG and two unusual epidermal growth factor-like domains (EGFs)...
August 6, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/30090096/%C3%AE-glucan-producing-pediococcus-parvulus-2-6-test-of-probiotic-and-immunomodulatory-properties-in-zebrafish-models
#3
Adrián Pérez-Ramos, Maria L Mohedano, Miguel Á Pardo, Paloma López
Lactic acid bacteria synthesize exopolysaccharides (EPS), which could benefit the host's health as immunomodulators. Furthermore, EPS could protect bacteria against gastrointestinal stress, favoring gut colonization, thus protecting the host against pathogenic infections. Pediococcus parvulus 2.6, produces a 2-substituted (1,3)-β-D-glucan and, in this work, its probiotic properties as well as the immunomodulatory capability of its EPS have been investigated using Danio rerio (zebrafish). To this end and for a comparative analysis, P...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/30087662/antimicrobial-properties-and-mechanism-of-action-of-some-plant-extracts-against-food-pathogens-and-spoilage-microorganisms
#4
Faraja D Gonelimali, Jiheng Lin, Wenhua Miao, Jinghu Xuan, Fedrick Charles, Meiling Chen, Shaimaa R Hatab
This work aims to evaluate the antimicrobial potential of ethanolic and water extracts of roselle ( Hibiscus sabdariffa) , rosemary ( Rosmarinus officinalis) , clove ( Syzygium aromaticum ), and thyme ( Thymus vulgaris ) on some food pathogens and spoilage microorganisms. Agar well diffusion method has been used to determine the antimicrobial activities and minimum inhibitory concentrations (MIC) of different plant extracts against Gram-positive bacteria ( Bacillus cereus, Staphylococcus aureus ), Gram-negative bacteria ( Escherichia coli, Salmonella enteritidis, Vibrio parahaemolyticus , and Pseudomonas aeruginosa ), and one fungus ( Candida albicans )...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/30084401/structure-of-the-gh9-glucosidase-glucosaminidase-from-vibrio-cholerae
#5
Liang Wu, Gideon J Davies
Glycoside hydrolase family 9 (GH9) of carbohydrate-processing enzymes primarily consists of inverting endoglucanases. A subgroup of GH9 enzymes are believed to act as exo-glucosidases or exo-glucosaminidases, with many being found in organisms of the family Vibrionaceae, where they are proposed to function within the chitin-catabolism pathway. Here, it is shown that the GH9 enzyme from the pathogen Vibrio cholerae (hereafter referred to as VC0615) is active on both chitosan-derived and β-glucoside substrates...
August 1, 2018: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/30082294/trend-and-pattern-of-antimicrobial-resistance-in-molluscan-vibrio-species-sourced-to-canadian-estuaries
#6
Swapan K Banerjee, Jeffrey M Farber
Emergence of antimicrobial resistance (AMR) in foodborne bacteria is a growing concern worldwide. AMR surveillance is a key element in understanding the implications resulting from the use of antibiotics for therapeutic as well as prophylactic needs. The emergence and spread of AMR in foodborne human pathogens is an indirect health hazard. This surveillance study reports the trend and pattern of AMR detected in Vibrio species isolated from molluscs harvested in Canada, between 2006 and 2012, against 19 commonly used antibiotics...
August 6, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/30077624/characterization-of-a-lytic-vibriophage-vp06-of-vibrio-parahaemolyticus
#7
Hin-Chung Wong, Tzu-Yun Wang, Chu-Wen Yang, Chung-Tao Tang, Chingwen Ying, Chun-Hsiung Wang, Wei-Hau Chang
Vibrio parahaemolyticus is a human enteropathogenic bacterium and is also pathogenic to shrimp and finfish. In a search for a biocontrol agent for V. parahaemolyticus and other pathogenic Vibrio species, a lytic phage VP06 was isolated from oyster using V. parahaemolyticus as the host. VP06 is a Siphoviridae phage with a polyhedral head and a long tail. The genome sequence of VP06 was 75,893 nucleotides in length and the G+C content was 49%; a total of 101 CDSs were identified in VP06, of which 39 exhibited functional domains/motifs...
August 2, 2018: Research in Microbiology
https://www.readbyqxmd.com/read/30072747/ancestral-gene-acquisition-as-the-key-to-virulence-potential-in-environmental-vibrio-populations
#8
Maxime Bruto, Yannick Labreuche, Adèle James, Damien Piel, Sabine Chenivesse, Bruno Petton, Martin F Polz, Frédérique Le Roux
Diseases of marine animals caused by bacteria of the genus Vibrio are on the rise worldwide. Understanding the eco-evolutionary dynamics of these infectious agents is important for predicting and managing these diseases. Yet, compared to Vibrio infecting humans, knowledge of their role as animal pathogens is scarce. Here we ask how widespread is virulence among ecologically differentiated Vibrio populations, and what is the nature and frequency of virulence genes within these populations? We use a combination of population genomics and molecular genetics to assay hundreds of Vibrio strains for their virulence in the oyster Crassostrea gigas, a unique animal model that allows high-throughput infection assays...
August 2, 2018: ISME Journal
https://www.readbyqxmd.com/read/30064021/expression-profiling-and-functional-characterization-of-cd36-in-turbot-scophthalmus-maximus-l
#9
Chao Li, Mengyu Tian, Lu Zhang, Qiang Fu, Lin Song, Ning Yang
CD36 is a scavenger receptor, a type of membrane-bound receptors that characterized by recognizing a variety of ligands including endogenous proteins and pathogens. Here, we characterized CD36 gene in turbot, and its expression patterns in mucosal barriers following different bacterial infection, as well as microbial ligand binding ability and bacteriostatic activities. In current study, one SmCD36 gene was captured with a 1407 bp open reading frame (ORF). In multiple species comparison, SmCD36 showed the highest similarity and identity to Cynoglossus semilaevis...
July 28, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/30064017/a-single-c4-zinc-finger-containing-protein-from-litopenaeus-vannamei-involved-in-antibacterial-responses
#10
Hongliang Zuo, Linwei Yang, Jiefu Zheng, Ziqi Su, Shaoping Weng, Jianguo He, Xiaopeng Xu
The Zinc finger domains (ZnFs), which contain finger-like protrusions stabilized by zinc ions and function to bind DNA, RNA, protein and lipid substrates, are ubiquitously present in a large number of proteins. In this study, a novel protein containing a single C4 type Znf domain (SZnf) was identified from Pacific white shrimp, Litopenaeus vannamei and its role in immunity was further investigated. The ZnF domain of SZnF but not other regions shared high homology with those of fushi tarazu-factor 1 (FTZ-F1) proteins...
July 28, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/30060647/discovery-of-a-nitric-oxide-responsive-quorum-sensing-circuit-in-vibrio-cholerae
#11
Sajjad Hossain, Ilana Heckler, Elizabeth M Boon
Group behavior of the human pathogen Vibrio cholerae, including biofilm formation and virulence factor secretion, is mediated by a process known as quorum sensing. Quorum sensing is a way by which bacteria coordinate gene expression in response to population density through the production, secretion, and detection of small molecules called autoinducers. Four autoinducer-mediated receptor histidine kinases have been implicated in quorum sensing through the phosphotransfer protein LuxU: CqsS, LuxP/Q, CqsR, and VpsS (Vc1445)...
August 3, 2018: ACS Chemical Biology
https://www.readbyqxmd.com/read/30060177/mutation-landscape-of-base-substitutions-duplications-and-deletions-in-the-representative-current-cholera-pandemic-strain
#12
Wen Wei, Lifeng Xiong, Yuan-Nong Ye, Meng-Ze Du, Yi-Zhou Gao, Kai-Yue Zhang, Yan-Ting Jin, Zujun Yang, Po-Chun Wong, Susanna K P Lau, Biao Kan, Jun Zhu, Patrick C Y Woo, Feng-Biao Guo
Pandemic cholera is a major concern for public health because of its high mortality and morbidity. Mutation accumulation (MA) experiments were performed on a representative strain of the current cholera pandemic. Although the base-pair substitution mutation rates in Vibrio cholerae (1.24×10-10 per site per generation for wild-type lines and 3.29 × 10-8 for mismatch repair deficient lines) are lower than that previously reported in other bacteria using MA analysis, we discovered specific high rates (8.31 × 10-8 site/generation for wild-type lines and 1...
July 30, 2018: Genome Biology and Evolution
https://www.readbyqxmd.com/read/30059022/quantifying-vibrio-cholerae-colonization-and-diarrhea-in-the-adult-zebrafish-model
#13
Dhrubajyoti Nag, Kristie Mitchell, Paul Breen, Jeffrey H Withey
Vibrio cholerae is best known as the infectious agent that causes the human disease cholera. Outside the human host, V. cholerae primarily exists in the aquatic environment, where it interacts with a variety of higher aquatic species. Vertebrate fish are known to be an environmental host and are a potential V. cholerae reservoir in nature. Both V. cholerae and the teleost fish species Danio rerio, commonly known as zebrafish, originate from the Indian subcontinent, suggesting a long-standing interaction in aquatic environments...
July 12, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/30056964/temperature-effects-on-the-growth-and-survival-of-tdh-positive-vibrio-parahaemolyticus-in-tissues-of-postharvest-manila-clam-ruditapes-philippinarum
#14
Carmen Lopez-Joven, Ignacio de Blas, Ana Roque
Bivalve storage at inadequate temperatures contains greater densities of Vibrio parahaemolyticus. The objective of the present study was to determine if there were any differences in growth and survival of potentially pathogenic V. parahaemolyticus (tdh positive) in relation to nonpathogenic V. parahaemolyticus (tdh-trh negative) levels in Manila clams (Ruditapes philippinarum) when exposed to different postharvest temperatures. Clams were depurated then exposed to known doses of both potential pathogenic and nonpathogenic V...
October 2018: Food Microbiology
https://www.readbyqxmd.com/read/30054912/assessment-of-food-quality-and-microbial-safety-of-brown-macroalgae-alaria-esculenta-and-saccharina-latissima
#15
M J Blikra, T Løvdal, M R Vaka, I S Roiha, B T Lunestad, C Lindseth, D Skipnes
BACKGROUND: There is a fast increase in the number of seaweed farms in the Western World, and it is crucial for these companies and their customers to have standardized methods for quality assessment and optimization. The aim of this study was to adapt known methods for food quality determination for analysis of seaweed quality, including color, texture and microbiology, and discuss optimal heat treatments for the popular macroalgae Saccharina latissima and Alaria esculenta. RESULTS: The development of a desirable, green color during heating was highly specific to species, freezing history and part of the thallus...
July 27, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/30053533/expression-of-macrobrachium-rosenbergii-lipopolysaccharide-and-%C3%AE-1-3-glucan-binding-protein-lgbp-in-saccharomyces-cerevisiae-and-evaluation-of-its-immune-function
#16
Jie Du, Huanxi Zhu, Chunlei Cao, Yan Ma
Pattern recognition proteins (PRPs) activate the innate immune system in invertebrates, and lipopolysaccharide- and β-1,3-glucan-binding protein (LGBP) is an important PRP with various biological functions. Here, the open reading frame (ORF) of Macrobrachium rosenbergii LGBP (MrLGBP) was cloned into plasmid vector pHAC181, then integrated into downstream of the GAL1 promoter of Saccharomyces cerevisiae strain GAL1-ScRCH1 via homologous recombination, followed by its expression in the yeast eukaryotic system...
July 24, 2018: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/30050634/-profile-and-antibiotic-susceptibility-pattern-of-bacterial-pathogens-associated-with-diarrheas-in-patients-presenting-at-the-kousseri-regional-hospital-anne-far-north-cameroon
#17
Jérôme Ateudjieu, Landry Beyala Bita'a, Etienne Guenou, Anthony Njimbia Chebe, Benjamin Azike Chukuwchindun, André Pascal Goura, Anne-Cécile Zoung-Kani Bisseck
Introduction: In most of the health facilities in Cameroon, the management of patients with diarrhea is based on presumptive diagnosis due to limited laboratory resources. This study aimed to determine germs profile and their susceptibility to antibiotics usually prescribed against pathogenic bacteria associated with diarrheas at the Kousseri Regional Hospital Annex from July to October 2015. Methods: We conducted a descriptive and cross-sectional study of all consenting individual presenting with diarrhea to the Kousseri Regional Hospital Annex during the study period...
2018: Pan African Medical Journal
https://www.readbyqxmd.com/read/30050457/seawater-acidification-reduced-the-resistance-of-crassostrea-gigas-to-vibrio-splendidus-challenge-an-energy-metabolism-perspective
#18
Ruiwen Cao, Yongliang Liu, Qing Wang, Dinglong Yang, Hui Liu, Wen Ran, Yi Qu, Jianmin Zhao
Negative physiological impacts induced by exposure to acidified seawater might sensitize marine organisms to future environmental stressors, such as disease outbreak. The goal of this study was to evaluate if ocean acidification (OA) could reduce the resistance capability of the Pacific oyster ( Crassostrea gigas ) to Vibrio splendidus challenge from an energy metabolism perspective. In this study, the Pacific oyster was exposed to OA (pH 7.6) for 28 days and then challenged by V. splendidus for another 72 h...
2018: Frontiers in Physiology
https://www.readbyqxmd.com/read/30048543/catabolism-of-mucus-components-influences-motility-of-vibrio-cholerae-in-the-presence-of-environmental-reservoirs
#19
Geethika Reddi, Kali Pruss, Kathryn L Cottingham, Ronald K Taylor, Salvador Almagro-Moreno
Vibrio cholerae O1, the etiological agent of cholera, is a natural inhabitant of aquatic ecosystems. Motility is a critical element for the colonization of both the human host and its environmental reservoirs. In this study, we investigated the molecular mechanisms underlying the chemotactic response of V. cholerae in the presence of some of its environmental reservoirs. We found that, from the several oligosaccharides found in mucin, two specifically triggered motility of V. cholerae O1: N-acetylneuraminic acid (Neu5Ac) and N-acetylglucosamine (GlcNAc)...
2018: PloS One
https://www.readbyqxmd.com/read/30047566/vibrio-vulnificus-in-aquariums-is-a-novel-threat-to-marine-mammals-and-public-health
#20
Meng Li, Lin Zhao, Jiajun Ma, Na Zhao, Jing Luo, Chengmin Wang, Lin Chen, Guoyao Ma, Yutian Wang, Hongxuan He
Vibrio vulnificus is a Gram-negative, curved, obligate halophilic marine bacterium that exclusively exists in coastal seawaters. Previous studies revealed that V. vulnificus is one of the most dangerous foodborne zoonotic pathogens for human beings. However, it remains unknown whether marine mammals can be infected by V. vulnificus. In May 2016, a captive spotted seal (Phoca largha) died due to septicemia induced by V. vulnificus. Upon post-mortem examination, V. vulnificus was isolated, identified, and named as BJ-PH01...
July 26, 2018: Transboundary and Emerging Diseases
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