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Three autoinducer molecules act synergistically to control virulence gene expression in Vibrio cholerae

ABSTRACT: Three autoinducer molecules act synergistically to control virulence gene expression in Vibrio cholerae

PROVIDER: PRJNA475800 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7298330.fastq.gz	Fastqsanger.gz
	SRR7298340.fastq.gz	Fastqsanger.gz
	SRR7298350.fastq.gz	Fastqsanger.gz
	SRR7298331.fastq.gz	Fastqsanger.gz
	SRR7298341.fastq.gz	Fastqsanger.gz

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Three autoinducer molecules act synergistically to control virulence gene expression in Vibrio cholerae [dataset 1]

Project description:Bacteria use quorum sensing (QS) to monitor cell density and coordinate group behaviours. In Vibrio cholerae, the causative agent of cholera disease, QS is linked to virulence gene expression via the autoinducer molecules, AI-2 and CAI-1. Both autoinducers share one signal transduction pathway to control AphA production, a key transcriptional activator of virulence genes. In this study, we demonstrate that the recently identified autoinducer, DPO, also controls AphA production in V. cholerae. DPO acts through the transcriptional activator, VqmA, and the VqmR small RNA to reduce AphA levels at the post-transcriptional level. Consequently, DPO inhibits virulence gene expression in V. cholerae, including repression of the cholera toxin, a key factor required for disease in humans. VqmR-mediated repression of AphA links the AI-2/CAI-1 and DPO-dependent QS pathways of V. cholerae and global transcriptome analysis indicate that all three autoinducers are required for full QS function. Together, our data provide the first view on autoinducer interplay in V. cholerae and highlight the importance of post-transcriptional gene regulation for collective functions in this major human pathogen.

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Project description:Three autoinducer molecules act synergistically to control virulence gene expression in Vibrio cholerae [dataset 1]

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Project description:Bacteria use quorum sensing to monitor cell density and coordinate group behaviours. In Vibrio cholerae, the causative agent of the diarrheal disease cholera, quorum sensing is connected to virulence gene expression via the two autoinducer molecules, AI-2 and CAI-1. Both autoinducers share one signal transduction pathway to control the production of AphA, a key transcriptional activator of biofilm formation and virulence genes. In this study, we demonstrate that the recently identified autoinducer, DPO, also controls AphA production in V. cholerae. DPO, functioning through the transcription factor VqmA and the VqmR small RNA, reduces AphA levels at the post-transcriptional level and consequently inhibits virulence gene expression. VqmR-mediated repression of AphA provides an important link between the AI-2/CAI-1 and DPO-dependent quorum sensing pathways in V. cholerae. Transcriptome analyses comparing the effect of single autoinducers versus autoinducer combinations show that quorum sensing controls the expression of ∼400 genes in V. cholerae and that all three autoinducers are required for a full quorum sensing response. Together, our data provide a global view on autoinducer interplay in V. cholerae and highlight the importance of RNA-based gene control for collective functions in this major human pathogen.

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