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ABSTRACT: Whole-Genome Tracking of Colistin-Resistant Escherichia coli in Broiler Chicken Processing

PROVIDER: PRJNA1271284 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR33800821_1.fastq.gz	Fastqsanger.gz
	SRR33800821_2.fastq.gz	Fastqsanger.gz
	SRR33800822_1.fastq.gz	Fastqsanger.gz
	SRR33800822_2.fastq.gz	Fastqsanger.gz
	SRR33800823_1.fastq.gz	Fastqsanger.gz

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Affymetrix SNP array data for chicken responses to glycoconjugate vaccination against Campylobacter jejuni

Project description:Campylobacter jejuni is a common cause of diarrheal disease worldwide. Human infection typically occurs through the ingestion of contaminated poultry products. We previously demonstrated that an attenuated Escherichia coli live vaccine strain expressing the C. jejuni N-glycan on its surface reduces the Campylobacter load in more than 50% of vaccinated leghorn and broiler birds to undetectable levels (responder birds), whereas the remainder of the animals were still colonized (non-responders). To understand the underlying mechanism, we conducted 3 larger scale vaccination and challenge studies using 135 broiler birds and found a similar responder/non responder effect. The submitted data were used for a genome-wide association study of the chicken responses to glycoconjugate vaccination against Campylobacter jejuni.

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Project description:Colistin-resistant Escherichia coli

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Project description:Acinetobacter baumannii is often highly resistant to multiple antimicrobials, posing a risk of treatment failure, and colistin is a "last resort" for treatment of the bacterial infection. However, colistin resistance is easily developed when the bacteria are exposed to the drug, and a comprehensive analysis of colistin-mediated changes in colistin-susceptible and -resistant A. baumannii is needed. In this study, using an isogenic pair of colistin-susceptible and -resistant A. baumannii isolates, alterations in morphologic and transcriptomic characteristics associated with colistin resistance were revealed. Whole-genome sequencing showed that the resistant isolate harbored a PmrBL208F mutation conferring colistin resistance, and all other single-nucleotide alterations were located in intergenic regions. Using scanning electron microscopy, it was determined that the colistin-resistant mutant had a shorter cell length than the parental isolate, and filamented cells were found when both isolates were exposed to the inhibitory concentration of colistin. When the isolates were treated with inhibitory concentrations of colistin, more than 80% of the genes were upregulated, including genes associated with antioxidative stress response pathways. The results elucidate the morphological difference between the colistin-susceptible and -resistant isolates and different colistin-mediated responses in A. baumannii isolates depending on their susceptibility to this drug.

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Project description:The expression of genes were analysed in muscle of 18th day of embryonic stage between Aseel, an indigenous slow-growing chicken, and control broiler, a fast-growing broiler chicken line. The whole embryo was collected in TRIZOL and total RNA was isolated. The expression profile of gene was determined in 64k Agilent chicken microarray chip. The Cy3 dye was used for detection. The fold change of expression was analysed in Aseel as compared to broiler chicken line.

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Project description:The emergence of colistin resistance in carbapenem-resistant and extended-spectrum ß-lactamase (ESBL)-producing bacteria is a significant threat to human health, and new treatment strategies are urgently required. Here we investigated the ability of the safe-for-human use ionophore PBT2 to restore antibiotic sensitivity in several polymyxin-resistant, ESBL-producing, carbapenem resistant Gram-negative human pathogens. PBT2 was observed to resensitize Klebsiella pneumoniae, Escherichia coli, Acinetobacter baumannii, and Pseudomonas aeruginosa to last-resort polymyxin class antibiotics, including a ‘next generation’ polymyxin derivative, FADDI-287. To gain additional insight into the potential mechanism of action of PBT2, we analyzed the transcriptome of K. pneumoniae and E. coli in the presence of sub-inhibitory concentrations of PBT2. Treatment with PBT2 was associated with multiple stress responses in both K. pneumoniae and E. coli. Significant changes in the transcription of transition metal ion homeostasis genes were observed in both strains.

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Project description:Colistin Resistant, mcr-positive Salmonella Isolated from Broiler Chicken in Jordan - Whole Genome sequences and assemblies

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