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Legionella oakridgensis RNA-Seq

ABSTRACT: Functional analysis of the alternative sigma-28 factor FliA and its anti sigma factor FlgM of the non-flagellated Legionella species L. oakridgensis

PROVIDER: PRJEB19613 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	ERR1855100.fastq.gz	Fastqsanger.gz
	ERR1855101.fastq.gz	Fastqsanger.gz
	ERR1855098.fastq.gz	Fastqsanger.gz
	ERR1855099.fastq.gz	Fastqsanger.gz

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Project description:Legionella pneumophila (Lp) is a waterborne bacterium able to infect human alveolar macrophages, causing a severe pneumonia known as Legionnaires’ disease. In water, Lp grows inside ciliates and ameoba. Lp is able to survive for several months in water, while searching for host cells. In Lp, the sigma factor RpoS is important for survival in water. Several small regulatory RNAs (sRNA) are known to regulate the expression of RpoS in other bacteria. A previous transcriptomic study showed that RpoS positively regulates the sRNA Lpr10 in Lp. Microarray analysis was performed to investigate the genes regulated by Lpr10.

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Project description:Legionella pneumophila is a water-borne pathogen, and thus survival in the aquatic environment is central to its transmission to humans. Hence, identifying genes required for its survival in water could help prevent Legionnaires’ disease outbreaks. In the present study, we investigate for the first time the role of the sigma factor RpoS in promoting the survival in water, where L. pneumophila experiences total nutrient deprivation. The rpoS mutant showed a significant survival defect compared to the wild-type strain in defined water medium (DFM). Then, we analyzed the transcriptome of the rpoS mutant during exposure to water using whole genome microarray analysis. We found that RpoS negatively affects the expression of several genes, including genes required for replication, cell division, translation and transcription, suggesting that the mutant fails to shutdown major metabolic programs.

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