Vibrio
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ABSTRACT:
PROVIDER: PRJNA355548 | ENA |
REPOSITORIES: ENA
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Project description:In recent years, due to the influence of climate change and rising sea temperature, the incidence of Vibrio alginolyticus infections is increasing, and becoming the second most common Vibrio species reported in human illness. Therefore, better understanding of the pathogenic mechanism of V. alginolyticus infection is urgently needed. Vvrr1 (Vibrio virulence regulatory RNA 1) is a new found ncRNA predicted to be closely related to the adhesion ability of V. alginolyticus through the previous RNA-seq. In this study, the target genes of Vvrr1 were fully screened and verified by constructing Vvrr1 over-expressed strains and proteome sequencing technology.
2020-05-26 | PXD014375 | Pride
Project description:In marine Vibrio species, chitin-induced natural transformation enables bacteria to take up DNA from the external environment and integrate it into their genome via homologous recombination. Expression of the master competence regulator TfoX bypasses the need for chitin induction and drives expression of the genes required for competence in several Vibrio species. Here, we show that TfoX expression in two Vibrio campbellii strains, DS40M4 and NBRC 15631, enables high frequencies of natural transformation. Conversely, transformation was not achieved in the model quorum-sensing strain V. campbellii BB120 (previously classified as Vibrio harveyi). Surprisingly, we find that quorum sensing is not required for transformation in V. campbellii DS40M4. This result is in contrast to Vibrio cholerae that requires the quorum-sensing regulator HapR to activate the competence regulator QstR. However, similar to V. cholerae, QstR is necessary for transformation in DS40M4. To investigate the difference in transformation frequencies between BB120 and DS40M4, we used previously studied V. cholerae competence genes to inform a comparative genomics analysis coupled with transcriptomics. BB120 encodes homologs of all known competence genes, but most of these genes were not induced by ectopic expression of TfoX, which likely accounts for the non-functional natural transformation in this strain. Comparison of transformation frequencies among Vibrio species indicates a wide disparity among even closely related strains, with Vibrio vulnificus having the lowest functional transformation frequency. We show that ectopic expression of both TfoX and QstR is sufficient to produce a significant increase in transformation frequency in Vibrio vulnificus.
2019-11-14 | GSE136941 | GEO
Project description:Whole genome sequencing to identify spontaneous nucleotide substitutions / deletions that allowed suppression of motility defect phenotype in ∆motV or ∆motW of Vibrio cholerae
2021-12-17 | E-MTAB-10691 | biostudies-arrayexpress
Project description:The bacterial pathogen Vibrio coralliilyticus infects a variety of marine organisms globally and causes early onset of disease in multiple coral species. The etiology of coral disease and relative pathogenicity of V. coralliilyticus strains is well-documented, but the mechanisms of V. coralliilyticus coral colonization, virulence factor production, and interactions with coral microbiome are understudied. Many virulence factors responsible for pathogenic behaviors are controlled through a density-dependent, bacterial communication system called quorum sensing (QS). In other Vibrio species, behaviors like bioluminescence, biofilm formation, toxin secretion, and protease production are controlled via the master quorum sensing transcriptional regulator called LuxR/HapR. Comparative genomics indicated that V. coralliilyticus genomes share high sequence identity for most of the QS signaling and regulatory components identified in other Vibrio species. Here, we characterize active components of the V. coralliilyticus QS system and identify the VcpR (LuxR/HapR homolog) regulons in two strains with distinct infection etiologies. We show that VcpR transcription is dependent on signaling by autoinducer AI-2, whereas we were unable to detect production of acyl-homoserine lactone autoinducers. The VcpR regulator controls expression of >200 genes in both the type strain BAA-450 and isolate OCN008, including two genes encoding proteases (VcpA and VcpB) known to impact coral infection. In both isolates, VcpR activates the expression of Type VI Secretion System genes from both systems 1 and 2, which results in interbacterial competition and killing of prey bacteria. We conclude that the QS system in V. coralliilyticus is active and controls expression of genes involved in relevant bacterial behaviors that may influence coral infection.
2024-12-10 | GSE232809 | GEO
Project description:Vibriosis caused by Vibrio vulnificus on eels represents an important threat for this specie under culture conditions. Development of new transcriptomic tools is essential to increase the knowledge of eel biology, that nowadays is scarcer. Therefore, using previous results obtained by 454 sequencing of the eel immune-enriched transcriptome, an eel-specific custom microarray have been designed. Gills transcriptomic pattern were analyzed as a principal portal of entry for pathogens in fish after 1h of bath infection with Vibrio vulnificus to describe gill immune response. Moreover, two different strains were used, vibro vulnificus wild type (R99) and rtx double mutant (CT285), to asses the virulence of these pathogen caused by MARTX.
2013-03-15 | GSE45163 | GEO
Project description:Genome sequencing and assembly of two Vibrio cholerae O1 Ogawa isolates
| PRJNA869863 | ENA
Project description:Although many members of the genus Vibrio are known to inhabit the marine photic zone, an understanding of the influence of light on the molecular physiology of Vibrio spp. has largely been neglected. To begin to characterize the photophysiology of one such Vibrio sp. (Vibrio campbellii ATCC strain BAA-1116) we used microarray-based expression profiling to compare the transcriptomes of illuminated versus dark cell cultures. Specficially, we compared the transcriptomes of wild type V. campbellii (STR) cells that were cultured in M9 minimal salts medium plus glucose under two conditions: (i) after 24 hours of continuous dark and (ii) after a 12 hour dark:12 hour light cycle (white light illumination at 54 µmol photons s-1 m-2). The results revealed a large photostimulon (differential expression of ~20% of the V. campbellii genome; adjusted p value < 0.0001) that surprisingly included ~75% of the type III secretion system (T3SS) genes which were found to be 1.6 – 5.4X more abundant in illuminated cultures. These findings, which were confirmed by quantitative reverse transcription PCR and quantitative membrane proteomics, strongly suggest that the photostimulon of strain BAA-1116 includes the T3SS.
2012-10-09 | GSE35702 | GEO
Project description:Differential RNA-Seq data for Vibrio campbellii BB120 (ATCC BAA-1116, previously designated as Vibrio harveyi)
2024-07-15 | GSE182898 | GEO
Project description:Objectives: determination of transcription start sites in Vibrio harveyi genome and discovery of new transcripts Methods: we performed differential seqencing of total RNA isolated from o.n. control Vibrio harveyi cultures. Sample treatment with Terminator EXonuclease (TEX) allowed differenciation of primary and secondary transcripts, helping in the definition of transcription start sites (TSS) Results: by data-mining RNA-seq data and performing some Northern Blot experiments we were able to detect new putative small-RNAs, along with these results, a more deep analisys of our RNA-seq data will give futher insight into genetic organization of Vibrio harveyi genome to help in its investigation
2018-03-27 | GSE105060 | GEO