Quorum Sensing and Biofilm Dynamics in Vibrio Species

Vibrio bacteria occupy a wide range of aquatic niches and include both free-living and host-associated species that impact human health, aquaculture and marine ecology. Central to their survival and pathogenicity is quorum sensing, a cell-density-dependent communication system that governs collective behaviours such as bioluminescence, virulence factor production and biofilm development. Biofilms are multicellular communities encased in an extracellular polymeric substance (EPS) matrix, which confers increased tolerance to environmental stresses, antimicrobials and host defences. In Vibrio species, quorum sensing employs multiple autoinducers and master regulators (for example, LuxR homologues) that switch transcriptional programmes between planktonic and biofilm modes. At low cell density, master regulators of the low-density state activate genes involved in surface attachment and matrix production; at high cell density, alternative regulators promote dispersal and nutrient foraging. This dynamic interplay ensures that biofilm formation is finely tuned to environmental cues, enabling Vibrios to colonise surfaces, form persisting reservoirs and then detach to spread or infect new hosts. Understanding these regulatory circuits and the biochemical composition of Vibrio biofilms has broad significance, from controlling cholera outbreaks and seafood-borne infections to informing antifouling strategies and bioremediation technologies.

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Quorum Sensing and Biofilm Dynamics in Vibrio Species publication trend

The graph below shows the total number of articles in quorum sensing and biofilm dynamics in vibrio species across all publications each year (not limited to Nature Index journals).

Technical terms

Quorum sensing: A mechanism of chemical communication in bacteria where accumulation of secreted signal molecules (autoinducers) triggers coordinated gene expression once a threshold concentration is reached.

Biofilm: A structured community of microbial cells enclosed within a self-produced polymeric matrix adherent to an inert or living surface.

Extracellular polymeric substance (EPS): A complex mixture of polymers including polysaccharides, proteins and nucleic acids that form the scaffold of a biofilm.

Autoinducer: A small diffusible signal molecule synthesised by bacteria; different classes include acyl-homoserine lactones, peptide signals and autoinducer-2.

Master regulator: A transcriptional factor at the apex of a regulatory hierarchy that integrates signalling inputs to control broad networks of target genes.

References

1. Insights Into the Role of Extracellular DNA and Extracellular Proteins in Biofilm Formation of Vibrio parahaemolyticus. Frontiers in Microbiology (2020).
2. Attenuation of Multiple Vibrio parahaemolyticus Virulence Factors by Citral. Frontiers in Microbiology (2019).
3. Transcriptional Regulation of the Type VI Secretion System 1 Genes by Quorum Sensing and ToxR in Vibrio parahaemolyticus. Frontiers in Microbiology (2017).