Ontology highlight
ABSTRACT:
PROVIDER: PRJNA688914 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR13337692.fastq.gz | Fastqsanger.gz |
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Project description:<p>Traveler's diarrhea (TD) is caused by enterotoxigenic Escherichia coli (ETEC), other pathogenic gram-negative pathogens, norovirus and some parasites. Nevertheless, standard diagnostic methods fail to identify pathogens in more than 30% of TD patients, so it is predicted that new pathogens or groups of pathogens may be causative agents of disease. A comprehensive metagenomic study of the fecal microbiomes from 23 TD patients and seven healthy travelers was performed, all of which tested negative for the known etiologic agents of TD in standard tests. Metagenomic reads were assembled and the resulting contigs were subjected to semi-manual binning to assemble independent genomes from metagenomic pools. Taxonomic and functional annotations were conducted to assist identification of putative pathogens. We extracted 560 draft genomes, 320 of which were complete enough to be enough characterized as cellular genomes and 160 of which were bacteriophage genomes. We made predictions of the etiology of disease in individual subjects based on the properties and features of the recovered cellular genomes. Three subtypes of samples were observed. First were four patients with low diversity metagenomes that were predominated by one or more pathogenic E. coli strains. Annotation allowed prediction of pathogenic type in most cases. Second, five patients were co-infected with E. coli and other members of the Enterobacteriaceae, including antibiotic resistant Enterobacter, Klebsiella, and Citrobacter. Finally, several samples contained genomes that represented dark matter. In one of these samples we identified a TM7 genome that phylogenetically clustered with a strain isolated from wastewater and carries genes encoding potential virulence factors. We also observed a very high proportion of bacteriophage reads in some samples. The relative abundance of phage was significantly higher in healthy travelers when compared to TD patients. Our results highlight that assembly-based analysis revealed that diarrhea is often polymicrobial and includes members of the Enterobacteriaceae not normally associated with TD and have implicated a new member of the TM7 phylum as a potential player in diarrheal disease. </p>
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Project description:We report the application of single-molecule-based sequencing technology for high-throughput profiling of transcription start sites for Escherichia coli under different conditions. By obtaining sequence from 5' RACE (rapid amplification of cDNA ends) followed by deep sequencing, we generated genome-wide TSS (transcription start site) maps for E. coli. This TSS-map was integrated with ChIP-chip data generated for 6 sigma factors in E. coli, resulting in reconstruction of sigma factor network in E. coli.
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Project description:The purpose of this study is to determine whether the presence of pathogenic Escherichia coli in colon is associated with psychiatric disorders.
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Project description:Elucidating host-bacteriophage dynamics is an important approach to elucidating bacterial survival functions and responses to infection. The model bacteriophage φX174 endemically found amongst the human intestinal microbiota and has a long history of use in bacteriophage based research, however the common laboratory host’s response to infection lacks detailed investigation. In this study we have measured host Escherichia coli C122 proteomic and transcriptomic response to φX174 infection to fill this knowledge gap. We identify differentially expressed genes and proteins during phage induced lysis. We also use mass spectrometry to identify and quantify all φX174 proteins and over 1700 E. coli proteins enabling us to comprehensively map host pathways involved in φX174 infection. Most notably, in our dual omics investigation we observe significant host responses pertaining to membrane remodeling, cellular chaperone activity, and lipoprotein processing. We also highlight host small heat-shock proteins IbpA and IbpB as having fold-change inductions comparable to that of the phage proteins. Together, this study provides foundational and the first proteomic and transcriptomic data characterizing host response to Microviridae infection.
2021-04-08 | PXD021681 | Pride