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Enterobacteriaceae

ABSTRACT: Gram-negative bacteria that fall under the family of Enterobacteriaceae. Raw sequence reads

PROVIDER: PRJNA342893 | ENA |

REPOSITORIES: ENA

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Dataset's files

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			Action	DRS
	SRR4302080_1.fastq.gz	Fastqsanger.gz
	SRR4302080_2.fastq.gz	Fastqsanger.gz
	SRR4302090_1.fastq.gz	Fastqsanger.gz
	SRR4302090_2.fastq.gz	Fastqsanger.gz
	SRR4302100_1.fastq.gz	Fastqsanger.gz

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Project description:The Enterobacteriaceae are a scientifically and medically important clade of bacteria, containing the gut commensal and model organism Escherichia coli, as well as several major human pathogens including Salmonella enterica and Klebsiella pneumoniae. Essential gene sets have been determined for several members of the Enterobacteriaceae, and the E. coli Keio single-gene deletion library is often regarded as a gold standard for gene essentiality studies. However, it remains unclear how much essential genes vary between strains and species. To investigate this, we have assembled a collection of thirteen sequenced high-density transposon mutant libraries from five genera of the Enterobacteriaceae. We first benchmark a number of gene essentiality prediction approaches, investigate the effects of transposon density on essentiality prediction, and identify biases in transposon insertion sequencing data. Based on these investigations we develop a new classifier for gene essentiality. Using gene essentiality defined by this new classifier, we define a core essential genome in the Enterobacteriaceae of 201 universally essential genes, and reconstruct an ancestral essential gene set of 296 genes. Despite the presence of a large cohort of variably essential genes, we find an absence of evidence for genus-specific essential genes. A clear example of this sporadic essentiality is given by the set of genes regulating the σE extracytoplasmic stress response, which appears to have independently become essential multiple times in the Enterobacteriaceae. Finally, we compare our essential gene sets to the natural experiment of gene loss in obligate insect endosymbionts closely related to the Enterobacteriaceae. This isolates a remarkably small set of genes absolutely required for survival, and uncovers several instances of essential stress responses masked by redundancy in free-living bacteria.

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Project description:Imbalance in beneficial and harmful bacteria underlies gastrointestinal diseases, such as inflammatory bowel disease. Here, we demonstrated that certain E. coli strains, specifically adherent-invasive E. coli (AIEC), utilize a serine metabolism pathway to outcompete other E. coli strains in the inflamed gut. In contrast, amino acid metabolism has a minimal effect on their competitive fitness in the healthy gut. The availability of luminal serine used for the competition of E. coli is largely dependent on dietary intake, as the inflammation-induced blooms of AIEC are significantly blunted when amino acids, particularly serine, are removed from the diet. Thus, intestinal inflammation regulates the intraspecific competition between Enterobacteriaceae by eliciting their metabolic reprogramming.

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2018-07-11 | PXD008019 | Pride

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