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From environmental adaptation to virulence: OmpR plays an important role in Vibrio vulnificus

ABSTRACT: From environmental adaptation to virulence: OmpR plays an important role in Vibrio vulnificus

PROVIDER: PRJNA1183851 | ENA |

REPOSITORIES: ENA

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From environmental adaptation to virulence: OmpR plays an important role in Vibrio vulnificus

Project description:Vibrio vulnificus (V. vulnificus) is an opportunistic human pathogen known for causing various illnesses such as gastroenteritis, skin and muscle necrosis, septic shock, and sepsis. This halophilic estuarine bacterium's growth and infection process involves adaptation to both the natural briny environments and the host. OmpR, a response regulator in the EnvZ/OmpR two-component regulatory system (TCS), is crucial for environmental adaptation and pathogenicity. This study focused on investigating the impact of OmpR in V. vulnificus by creating an ompR knockout strain (ΔompR). The ΔompR strain exhibited reduced tolerance to alkaline stress, shorter flagella, and decreased virulence in epithelial cell and mouse models compared to the wild-type (WT) V. vulnificus. RNAseq analysis revealed the downregulation of genes involved in metabolism, flagellum-dependent motility, and transcription factors in the ΔompR strain. OmpR was found to repress the expression of aphB in alkaline conditions, impacting the acid resistance system CadBA, while also positively regulating the transcription of various flagellar genes. These findings suggest that OmpR acts as a global regulator, orchestrating the expression of multiple genes in response to different environments and during host invasion.

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Transcriptome analysis of virulence factors in Vibrio vulnificus FORC_036, isolated from a surf clam

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ARID1A plays an important role in skin inflammation.

Project description:ARID1A plays an important role in skin inflammation.

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Project description:IscR is a novel global regulator potentially contributing to the overall success in survival and pathogenesis of V. vulnificus by coordinating the regulation of various virulence factors. The profiles of transcripts from the V. vulnificus iscR mutant and the parental wild type were compared by using a V. vulnificus whole-genome microarray.

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European eel immune response against Vibrio vulnificus challenge

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.

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Expression profiling of EvgSc and ompR mutants

Project description:In order to explore the transcriptional reprogramming in EvgSc, ompR and EvgSc/ompR mutants we have used whole genome microarray profiling. EvgSc, ompR and EvgSc/ompR mutants were developed. Each mutant was profiled in duplicate.

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Expression profiling of EvgSc and ompR mutants

Project description:In order to explore the transcriptional reprogramming in EvgSc, ompR and EvgSc/ompR mutants we have used whole genome microarray profiling.

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Genome- and proteome-wide analysis of lysine acetylation in Vibrio vulnificus Vv180806 reveals its regulatory roles in virulence and antibiotic resistance

Project description:V. vulnificus is an emergent pathogen and causes deadly septicemia in human. Protein acetylation regulates many important biological processes in bacteria. In this study, we identified the first lysine acetylome of V. vulnificus based on the whole-genome sequence of a cefoxitin-resistant strain isolated from a mortality case in China. A total of 6,626 acetylation sites at 1,924 acetylated proteins were uncovered, which to our knowledge represented the largest acetylated protein number that has been identified in bacteria. The presence of acetylation sites in virulence- and antibiotic resistance-related proteins further indicated the important role of acetylated modification on bacterial virulence and antibiotic resistance. Further investigation on the regulatory mechanisms will provide a better understanding of pathogen-host interactions in this increasingly pathogen.

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Project description:The profiles of transcripts from the planktonic cells and biofilm cells of V. vulnificus were compared by using a V. vulnificus whole-genome microarray

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