Ontology highlight
ABSTRACT:
PROVIDER: PRJNA509514 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR8301920_1.fastq.gz | Fastqsanger.gz | |||
| SRR8301920_2.fastq.gz | Fastqsanger.gz | |||
| SRR8301930_1.fastq.gz | Fastqsanger.gz | |||
| SRR8301930_2.fastq.gz | Fastqsanger.gz | |||
| SRR8301940_1.fastq.gz | Fastqsanger.gz |
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Project description:The gut of chicken is mostly colonised with Campylobacter jejuni and with 100 fold less C. coli. The competitive ability of C. coli OR12 over C. jejuni OR1 has been examined in experimental broiler chickens following the observation that C. coli replaced an established C. jejuni intestinal colonisation within commercial chicken flocks reared outdoors (El-Shibiny, A., Connerton, P.L., Connerton, I.F., 2005. Enumeration and diversity of campylobacters and bacteriophages isolated during the rearing cycles of free-range and organic chickens. Applied Environmental Microbiology. 71, 1259-1266).
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Project description:Campylobacter jejuni is one of the most important zoonotic enteric bacterial pathogens able to colonize the gastrointestinal tract of various animals. The number of campylobacteriosis cases has increased worldwide and the particular concern has been the high level of fluoroquinolone resistance observed in C. jejuni isolates. In this study, we explored the effect of ciprofloxacin in Campylobacter jejuni by gene expression microarray analysis. The comparisons of transcriptional responses were performed in the absence and presence of ciprofloxacin with the wild-type strain 81-176 and its intermediate-resistant variant (P3). The resistant variant contained a single-nucleotide mutation causing amino acid change Asp-90-Asn in the gyrA gene instead of the most common Thr-86-Ile, causing a high-level resistance to ciprofloxacin. After the short-term exposure to a relatively high concentration of ciprofloxacin, the viability of C. jejuni 81-176 wild-type cells remained notably high when compared with other gram-negative bacteria. The general responses of short-term ciprofloxacin exposure were determined from both genetic backgrounds and resulted in the expression variation of genes participating in general cellular processes, e.g. , in carbon and amino-acid metabolism and protein transport.
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Project description:Campylobacter jejuni is one of the most important zoonotic enteric bacterial pathogens able to colonize the gastrointestinal tract of various animals. The number of campylobacteriosis cases has increased worldwide and the particular concern has been the high level of fluoroquinolone resistance observed in C. jejuni isolates. In this study, we explored the effect of ciprofloxacin in Campylobacter jejuni by gene expression microarray analysis. The comparisons of transcriptional responses were performed in the absence and presence of ciprofloxacin with the wild-type strain 81-176 and its intermediate-resistant variant (P3). The resistant variant contained a single-nucleotide mutation causing amino acid change Asp-90-Asn in the gyrA gene instead of the most common Thr-86-Ile, causing a high-level resistance to ciprofloxacin. After the short-term exposure to a relatively high concentration of ciprofloxacin, the viability of C. jejuni 81-176 wild-type cells remained notably high when compared with other gram-negative bacteria. The general responses of short-term ciprofloxacin exposure were determined from both genetic backgrounds and resulted in the expression variation of genes participating in general cellular processes, e.g. , in carbon and amino-acid metabolism and protein transport. Ciprofloxacin effect for gene expression was measured from both genetic backgrounds after 1 hour exposure at the level of 0 and 8 µg/ml ciprofloxacin in MH-broth. For RNA isolation, 5 independent experiments with and without ciprofloxacin were performed, and 4 replicates of each total RNA was applied for the gene expression study.
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Project description:Fluoroquinolones (FQs) are one class of commonly used antimicrobials in clinical therapy of diseases caused by Campylobacter and other foodborne pathogens. The molecular mechanisms underlying the response of Campylobacter to FQ treatment is of interest because unlike other enteric bacteria, Campylobacter lacks many genes encoding components of DNA repair systems and SOS response. To understand how Campylobacter survive antibiotic treatment, DNA microarray was used to compare the gene expression profiles of C. jejuni 11168 in the presence and absence of ciprofloxacin. Our analysis identified 45 genes that showed ≥1.5-fold (p<0.05) changes in expression in the presence of ciprofloxacin. The up-regulated genes (13) are involved in cell membrane biosynthesis and DNA repair or have unknown functions, while the majority of the down-regulated genes (32) are involved in cellular process and energy metabolism. These findings suggest that C. jejuni modulates membrane biosynthesis, increases spontaneous mutation rates, and decreases metabolism in response to fluoroquinolone treatment. Keywords: 0.06 µg/ml (0.5X MIC) or 1.2 µg/ml (10X MIC) ciprofloxacin treated campylobacter VS. untreated campylobacter, the bacterial cells were treated for 0.5 hour
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2015-09-15 | E-GEOD-17805 | biostudies-arrayexpress
Project description:Campylobacter jejuni is a major zoonotic pathogen transmitted to humans via the food chain. C. jejuni is prevalent in chickens, a natural reservoir for this pathogenic organism. Due to the importance of macrolide antibiotics in clinical therapy of human campylobacteriosis, development of macrolide resistance in Campylobacter has become a concern for public health.To facilitate understanding the molecular basis associated with the fitness difference between Erys and Eryr Campylobacter, we compared the transcriptomes between ATCC 700819 and its isogenic Eryr transformant T.L.101 using DNA microarray.
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Project description:Background: The food-borne pathogen Campylobacter is one of the most important zoonotic pathogens. Compared to other zoonotic bacteria, Campylobacter species are quite susceptible to environmental or technological stressors. This might be due to the lack of many stress response mechanisms described in other bacteria. Nevertheless, Campylobacter is able to survive in the environment and food products. Although some aspects of the heat stress response in Campylobacter (C.) jejuni are already known, information about the heat stress response in the related species C. coli and C. lari are still unknown. Results: The stress response to elevated temperatures (46°C) was investigated by survival assays and whole transcriptome analyses for the strain C. jejuni NCTC11168, C. coli RM2228 and C. lari RM2100. While C. jejuni showed highest thermotolerance followed by C. lari and C. coli, none of the strains survived at this temperature for more than 24 hours. Transcriptomic analyses revealed that only 3 % of the genes in C. jejuni and approx. 20 % of the genes of C. coli and C. lari were differentially expressed after heat stress, respectively. The transcriptomic profiles showed enhanced gene expression of several chaperones like dnaK, groES, groEL and clpB in all strains, but differences in the gene expression of transcriptional regulators like hspR, perR as well as for genes involved in metabolic pathways, translation processes and membrane components. However, the function of many of the differentially expressed gene is unknown so far. Conclusion: We could demonstrate differences in the ability to survive at elevated temperatures for C. jejuni, C. coli and C. lari and showed for the first time transcriptomic analyses of the heat stress response of C. coli and C. lari. Our data suggest that the heat stress response of C. coli and C. lari are more similar to each other compared to C. jejuni, even though on genetic level a higher homology exists between C. jejuni and C. coli. This indicates that stress response mechanisms described for C. jejuni might be unique for this species and not necessarily transferable to other Campylobacter species.
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Project description:Background: The food-borne pathogen Campylobacter is one of the most important zoonotic pathogens. Compared to other zoonotic bacteria, Campylobacter species are quite susceptible to environmental or technological stressors. This might be due to the lack of many stress response mechanisms described in other bacteria. Nevertheless, Campylobacter is able to survive in the environment and food products. Although some aspects of the heat stress response in Campylobacter (C.) jejuni are already known, information about the heat stress response in the related species C. coli and C. lari are still unknown. Results: The stress response to elevated temperatures (46°C) was investigated by survival assays and whole transcriptome analyses for the strain C. jejuni NCTC11168, C. coli RM2228 and C. lari RM2100. While C. jejuni showed highest thermotolerance followed by C. lari and C. coli, none of the strains survived at this temperature for more than 24 hours. Transcriptomic analyses revealed that only 3 % of the genes in C. jejuni and approx. 20 % of the genes of C. coli and C. lari were differentially expressed after heat stress, respectively. The transcriptomic profiles showed enhanced gene expression of several chaperones like dnaK, groES, groEL and clpB in all strains, but differences in the gene expression of transcriptional regulators like hspR, perR as well as for genes involved in metabolic pathways, translation processes and membrane components. However, the function of many of the differentially expressed gene is unknown so far. Conclusion: We could demonstrate differences in the ability to survive at elevated temperatures for C. jejuni, C. coli and C. lari and showed for the first time transcriptomic analyses of the heat stress response of C. coli and C. lari. Our data suggest that the heat stress response of C. coli and C. lari are more similar to each other compared to C. jejuni, even though on genetic level a higher homology exists between C. jejuni and C. coli. This indicates that stress response mechanisms described for C. jejuni might be unique for this species and not necessarily transferable to other Campylobacter species.
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2023-01-24 | PXD035008 | Pride