Ontology highlight
ABSTRACT:
PROVIDER: PRJNA606446 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| Other | ||||
| SRR13249121_1.fastq.gz | Fastqsanger.gz | |||
| SRR13249121_2.fastq.gz | Fastqsanger.gz | |||
| SRR13249122_1.fastq.gz | Fastqsanger.gz | |||
| SRR13249122_2.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 9 |
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Project description:Aeromonas are ubiquitous inhabitants of both natural and anthropogenic aquatic ecosystems. Occasionally, Aeromonas also grows in drinking water distribution systems, which is highly undesired due to the pathogenicity of some members of this genus. The growth of Aeromonas in such highly oligotrophic environments is currently poorly understood. Possible nutrient sources are biopolymers. For example, chitin is the structural component of the exoskeleton of insects, some invertebrates and the cell walls of fungi which makes it one of the most abundant carbon and nitrogen sources in nature. In this study we demonstrate the ability of two Aeromonas strains, Aeromonas bestiarum and Aeromonas rivuli to efficiently grow on chitin. The secreted proteins confirm the presence of the functional hydrolytic enzymes that enable the efficient degradation and utilization of this abundant biopolymer. Further quantitative cellular proteomic study unravels the remarkable reorganization of the Aeromonas metabolism when switching to chitin as sole carbon and nitrogen source. This proves that Aeromonas is not only chitinolytic but also a chitinotrophic microorganism.
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Project description:This study took Aeromonas hydrophila as an example to study the GGDEF family gene and explore its biological function in Aeromonas hydrophila and its influence on c-di-GMP concentration. In order to systematically study the biological function of GGDEF family genes, 36 strains (54 strains screened by whole genome sequencing) with gene deletion mutation were first constructed, and then phenotypes such as biofilm, crawling and extracellular protease activity were detected. The concentration of c-di-GMP in aeromonas hydrophila was determined by HPLC. At the same time, the deletion strains with GGDEF domain that had a significant effect on the physiological function of Aeromonas hydrophila were screened for mass spectrometry identification, so as to explore the possible molecular mechanism of GGDEF domain protein affecting the physiological function.
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Project description:Aims: To assess the virulence of multiple Aeromonas spp. using two models, a neonatal mouse assay and a mouse intestinal cell culture. Methods and Results: Transcriptional responses to both infection models were evaluated using microarrays. After artificial infection with a variety of Aeromonas spp., mRNA extracts from the two models were processed and hydridized to murine microarrays to determine host gene response. Definition of virulence was determined based on host mRNA production in murine neonatal intestinal tissue and mortality of infected animals. Infections of mouse intestinal cell cultures were then performed to determine whether this simpler model system's mRNA responses correlated to neonatal results and therefore be predictive of virulence of Aeromonas spp. Virulent aeromonads up-regulated transcripts in both models including multiple host defense gene products (chemokines, regulation of transcription and apoptosis, cell signaling). Avirulent species exhibited little or no host response in neonates. Mortality results correlated well with both bacterial dose and average fold change of up-regulated transcripts in the neonatal mice. Conclusions: Cell culture results were less discriminating but showed promise as potentially being able to be predictive of virulence. Jun oncogene up-regulation in murine cell culture is potentially predictive of Aeromonas virulence. Significance and Impact of the Study: Having the ability to determine virulence of waterborne pathogens quickly would potentially assist public health officials to rapidly assess exposure risks. Experiment Overall Design: Two infection models were assessed, live, whole animals (neonatal Swiss Webster mice) and a murine small intestinal cell culture. Biological replicates (n=5) were infected with different Aeromonas species/strains and compared to uninfected controls.
2008-06-15 | E-GEOD-6065 | biostudies-arrayexpress
Project description:Aims: To assess the virulence of multiple Aeromonas spp. using two models, a neonatal mouse assay and a mouse intestinal cell culture. Methods and Results: Transcriptional responses to both infection models were evaluated using microarrays. After artificial infection with a variety of Aeromonas spp., mRNA extracts from the two models were processed and hydridized to murine microarrays to determine host gene response. Definition of virulence was determined based on host mRNA production in murine neonatal intestinal tissue and mortality of infected animals. Infections of mouse intestinal cell cultures were then performed to determine whether this simpler model system's mRNA responses correlated to neonatal results and therefore be predictive of virulence of Aeromonas spp. Virulent aeromonads up-regulated transcripts in both models including multiple host defense gene products (chemokines, regulation of transcription and apoptosis, cell signaling). Avirulent species exhibited little or no host response in neonates. Mortality results correlated well with both bacterial dose and average fold change of up-regulated transcripts in the neonatal mice. Conclusions: Cell culture results were less discriminating but showed promise as potentially being able to be predictive of virulence. Jun oncogene up-regulation in murine cell culture is potentially predictive of Aeromonas virulence. Significance and Impact of the Study: Having the ability to determine virulence of waterborne pathogens quickly would potentially assist public health officials to rapidly assess exposure risks. Keywords: Aeromonas; Virulence; Gene expression; Host response
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