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Whole genome sequencing of non-O157 STEC

ABSTRACT: Comparative genomics to delineate pathogenic potential in non-O157 Shiga toxin-producing Escherichia coli (STEC) from patients with and without haemolytic uremic syndrome (HUS) in Norway.

PROVIDER: PRJEB6447 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	CCPO01.dat.gz	Other
	CCPO01.fasta.gz	Fasta.gz
	CCPO01.master.dat	Other
	CCPP01.dat.gz	Other
	CCPP01.fasta.gz	Fasta.gz

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Comparative Transcriptome Profiling Reveals a Potential Role of Type VI Secretion System and Fimbriae in Virulence of Non-O157 Shiga Toxin-Producing Escherichia coli

Project description:We have used RNA sequencing to compare transcriptomes of 30 stx2a and eae positive STEC strains of non-O157 serogroups isolated from children < 5 years of age. The strains were from children with HUS (HUS group, n=15), and children with asymptomatic or mild disease (non-HUS group, n=15), either induced with mitomycin C or non-induced, to reveal potential differences in gene expression levels between groups. When the HUS and non-HUS group were compared for differential expression of protein-encoding gene families, 399 of 6119 gene families were differentially expressed (log2 fold change ≥ 1, FDR < 0.05) in the non-induced condition, whereas only one gene family was differentially expressed in the induced condition. Gene ontology and cluster analysis showed that several fimbrial operons, as well as a putative type VI secretion system (T6SS) were more highly expressed in the HUS group than in the non-HUS group, indicating a role of these in the virulence of STEC strains causing severe disease.

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Project description:Escherichia coli O157:H7 can cause haemorrhagic colitis and haemolytic uremic syndrome (HUS) in humans. This pathogen has been implicated in large food-borne outbreaks all over the world. By investigating the implicated salted salmon roe, Makino et al. (2000) suggested that E. coli O157:H7 in the viable but nonculturable (VBNC) state should be the culprit of the outbreak in Japan. High pressure CO2 (HPCD), one of the non-thermal pasteurization techniques, is an effective means to inactivate microorganisms. But in the previous study, we have demonstrated for the first time that HPCD could induce E. coli O157:H7 into the VBNC state, which poses a potential health risk to HPCD-treated products. In order to explore the potential formation mechanisms of VBNC E. coli O157:H7 induced by HPCD, the high-throughput Illumina RNA-seq transcriptomic analysis was conducted for E. coli O157:H7 cells treated at 5 MPa and 25 ℃ for 40 min (VBNC cells) and exponential-phase cells (the control). Finally, 97 genes that differentially transcribed between VBNC state and the control were obtained, with 22 genes up-regulated and 75 genes down-regulated in VBNC cells. These differentially expressed genes were classified in a variety of functional categories, including central metabolic processes, gene replication and expression, cell division, general stress response, respiration, membrane biosynthesis and transport and pathogenicity. Based on these differentially expressed genes, we suggest putative formation mechanisms of VBNC cells induced by HPCD. The finding will provide theoretical foundation for restraining the VBNC state formation under HPCD processing.

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