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ABSTRACT: Enterohermorrhagic Escherichia coli (EHEC) of the O113:H21 serotype

PROVIDER: PRJNA548004 | ENA |

REPOSITORIES: ENA

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			Action	DRS
		Other
	SRR11485259_1.fastq.gz	Fastqsanger.gz
	SRR11485259_2.fastq.gz	Fastqsanger.gz
	SRR11485260_1.fastq.gz	Fastqsanger.gz
	SRR11485261_1.fastq.gz	Fastqsanger.gz

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Escherichia coli O113:H21

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Project description:Enterohemorrhagic Escherichia coli (EHEC) is a gram negative enteric bacterial pathogen that can cause hemorrhagic colitis and heamolytic uremic syndrome (HUS) in humans and is the cause of bloody diarrhoea and acute renal failure in children. We have studied the transcriptional response of a colon cell line (CaCo2) to infection by EHEC and another closely related enteric pathogen Enteropathogenic Escherichia coli (EPEC) and compared its response to a cervical cell line (Hela). We carried out microarray analysis on CaCo2 infected with EHEC O157H:7 EDL933 and EPEC E2348/69 at 4 hours of infection and analysis on Hela infected with EHEC also at 4 hours of infection

2016-09-01 | GSE13403 | GEO

Genomic comparison in Enteroheamorragic E. coli O157 and non-O157 serotypes by comparative genomic hybridization.

Project description:Background: Enterohemorrhagic Escherichia coli (EHEC) O157 causes severe food-bone illness in humans. The chromosome of O157 consists of 4.1-Mb backbone sequences shared by benign E. coli K-12, and 1.4-Mb O157-specific sequences encoding many virulence determinants such as Shiga toxin genes (stxs) and the locus of enterocyte effacement (LEE). Non-O157 EHECs belonging to clonal lineages distinct from O157 also cause similar illness in humans. According to the parallel evolution model, they have independently acquired the major virulence determinants, stxs and LEE. However, the genomic differences between O157 and non-O157 EHECs have not yet systematically been analyzed. Results: By using the microarray and Whole Genome PCR scanning analyses, we performed a whole genome comparison of 20 EHEC strains of O26, O111, and O103 serotypes with O157. In non-O157 EHEC strains, although genome sizes were similar with or rather larger than O157 and the backbone regions were well conserved, O157-specific regions were very poorly conserved. Only around 20% of the O157-specific genes were fully conserved in each non-O157 serotype. However, the non-O157 EHECs contained a significant number of virulence genes found on prophages and plasmids in O157, and also multiple prophages similar but significantly divergent from those in O157. Conclusion: Although O157 and non-O157 EHECs have independently acquired a huge amount of serotype- or strain-specific genes by lateral gene transfer, they share an unexpectedly large number of virulence genes. Independent infections of similar but distinct bacteriophages carrying these virulence determinants appear to be involved in the parallel evolution of EHEC. Keywords: comparative genomic hybridization, CGH

2007-08-23 | GSE7931 | GEO

Transcriptomic analysis for response of EHEC to short chain fatty acids

Project description:Enterohaemorrhagic Escherichia coli (EHEC) is an emerging pathogen that causes diarrhea and heamolytic uremic syndrome. Expression of genes associated to pathogenicity is strictly regulated by environmental factors. Since short chian fatty acids (SCFAs) are present in intestinal tract which is a target of EHEC infection, we investigated the response of EHEC genes to SCFAs, such as acetate, propionate and butyrate. Keywords: Culture condition

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Transcriptional analysis of Escherichia coli O157:H7 delta yedL in MEM-HEPES

Project description:Deletion of yedL was found to signifcantly decrease type three secretion in EHEC O157:H7. Transcriptional profiles of Escherichia coli O157: H7 and the isogenic yedL mutant were generated and compared.

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Transcriptional analysis of Escherichia coli O157:H7 delta yhaO in MEM-HEPES

Project description:Deletion of yhaO was found to signifcantly decrease type three secretion in EHEC O157:H7. Transcriptional profiles of Escherichia coli O157: H7 and the isogenic yhaO mutant were generated and compared.

2017-07-24 | GSE15261 | GEO

Comparison of acid treated and untreated

Project description:Enterohemorrhagic Escherichia coli (EHEC) is a gram negative enteric bacterial pathogen that can cause hemorrhagic colitis and heamolytic uremic syndrome (HUS) in humans and is the cause of bloody diarrhoea and acute renal failure in children. We have studied the transcriptional response of a colon cell line (CaCo2) to infection by EHEC and compared its profile to infection by EHEC shocked in acid at pH 2.5. We carried out microarray analysis on CaCo2 infected with EHEC O157H:7 EDL933 and EHEC shocked at pH 2.5 at 4 hours post infection.

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CDK1-formin signal confers microvillar effacement by an attaching and effacing (A/E) pathogen

Project description:Enterohemorrhagic Escherichia coli (EHEC) induces the attachment and effacement of intestinal microvilli. While the molecular mechanisms contributed to the attachment of EHEC have been thoroughly studied, the underlying mechanisms for the effacement of intestinal microvilli induced by EHEC remained elusive. By focus RNAi screening and genetic analysis in C. elegans and further reconfirmed in human Caco-2 intestinal epithelial cells, we demonstrate that the CDK1-formin signal axis is required for this EHEC-induced microvillar effacement in vitro and in vivo.

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