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ABSTRACT: WGS of heat-resistant Salmonella Typhimurium mutants

PROVIDER: PRJNA1032469 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR26534500_1.fastq.gz	Fastqsanger.gz
	SRR26534500_2.fastq.gz	Fastqsanger.gz
	SRR26534501_1.fastq.gz	Fastqsanger.gz
	SRR26534501_2.fastq.gz	Fastqsanger.gz
	SRR26534502_1.fastq.gz	Fastqsanger.gz

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Influence of Microbial and Host Cell Sublethal Heat Stress on S. Typhimurium Gene Expression

Project description:Environmental stress contributes to the outcome of infection by impacting both microbial virulence and host susceptibility to infection. Thermal processing, commonly used for decontamination of poultry in the food industry, may elicit sublethal stress on resistant serovars of Salmonella. We employed traditional heat shock temperatures (42 and 48ºC), similar to avian body temperature and poultry processing conditions, to study gene expression of Salmonella enterica serovar Typhimurium. Microarray analysis indicated that thermal shock at 42°C and 48°C induced expression of SPI-2 and SPI-5 genes, whose products are required for adhesion and survival. However, SPI-1 genes, responsible for invasion of Salmonella into host cells, were down-regulated following exposure to 42°C and 48°C. Bacterial adhesion assays showed greater adhesion of heat-stressed S. Typhimurium to Caco-2 cells compared to non-stressed bacteria. In addition, subjecting Caco-2 cells to mild heat shock (39°C), which is similar to human fever, enhanced host cell susceptibility to bacterial adhesion. Data indicate that thermal stress enhances bacterial colonization and host cell susceptibility to adhesion during S. Typhimurium infection.

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Deciphering RpoD-family sigma factors transcriptional regulatory network highlights their multifaceted roles under heat shock conditions in Salmonella Typhimurium [ChIP-exo]

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Project description:Investigation of whole genome gene expression level changes in a Salmonella enterica serovar Typhimurium UK1 delta-iacP mutant, compared to the wild-type strain. IacP is resoponsible for the secretion of virulence effector proteins via the type III secretion system, thereby contributing the virulence of S. Typhimurium. The mutants analyzed in this study are further described in Kim et al. 2011. Role of Salmonella Pathogenicity Island 1 Protein IacP in Salmonella enterica Serovar Typhimurium Pathogenesis. Infection and Immunity 79(4):1440-1450 (PMID 21263021).

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Project description:To investigate the effects of MccY on Salmonella Typhimurium, Ton system genes mutants were constructed and RNA-seq analysis were performed.

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