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Related Concept Videos

Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

23
Quorum sensing is a mechanism of bacterial communication that enables coordinated gene expression in response to changes in population density. This facilitates collective behaviors that enhance survival, resource acquisition, and ecological adaptation. This process relies on small signaling molecules called autoinducers that accumulate as bacterial populations grow. When a critical threshold concentration of autoinducers is reached, bacterial cells collectively modify gene expression,...
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Bacterial Signaling01:30

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Bacterial signaling can occur within bacteria (intracellular) or between bacteria (intercellular). At times, a group of bacteria behaves like a community. To achieve this, they engage in quorum sensing, the perception of higher cell density that causes changes in gene expression. Quorum sensing involves both extracellular and intracellular signaling. The signaling cascade starts with a molecule called an autoinducer (AI). Individual bacteria produce AIs that move out of the bacterial cell...
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Global Regulatory Systems01:28

Global Regulatory Systems

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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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Yeast Signaling01:28

Yeast Signaling

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Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...
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Overview of Cell Signaling01:23

Overview of Cell Signaling

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Despite the protective membrane that separates a cell from the environment, cells need the ability to detect and respond to environmental changes. Additionally, cells often need to communicate with one another. Unicellular and multicellular organisms use a variety of cell signaling mechanisms to communicate with the environment.
Cells respond to many types of information, often through receptor proteins positioned on the membrane. For example, skin cells respond to and transmit touch...
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Cell Signaling in Plants01:25

Cell Signaling in Plants

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Plant cells communicate to coordinate their cycle of growth, flowering and fruiting, and activities in roots, shoots, and leaves in response to the changing environmental conditions. Plant signaling is distinct from animal signaling. Plants primarily utilize enzyme-linked receptors, whereas the largest class of cell-surface receptors in animals are G-protein coupled receptors (GPCRs). Unlike animals, receptor tyrosine kinases are rare in plants. Instead, plants have a diverse class of...
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Related Experiment Video

Updated: Jul 13, 2025

Time-lapse Imaging of Bacterial Swarms and the Collective Stress Response
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Time-lapse Imaging of Bacterial Swarms and the Collective Stress Response

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Quorum sensing going wild.

Mihael Spacapan1, Cristina Bez1, Vittorio Venturi1

  • 1International Centre for Genetic Engineering and Biotechnology, Padriciano 99, 34149 Trieste, Italy.

Iscience
|October 13, 2023
PubMed
Summary

Bacterial quorum sensing (QS) is more than a cell-density switch. QS can drive phenotypic heterogeneity, promoting bacterial specialization and division of labor, akin to "bacterial civilizations".

Area of Science:

  • Microbiology
  • Bacterial Communication
  • Systems Biology

Background:

  • Bacterial quorum sensing (QS) using N-acyl homo-serine lactones (AHLs) in Vibrio fischeri is well-characterized.
  • QS is traditionally viewed as a cell-density-dependent regulatory switch.
  • AHL concentration does not always correlate with cell density, and not all cells respond to QS signals.

Purpose of the Study:

  • To highlight the significance of QS-dependent phenotypic heterogeneity in bacteria.
  • To explore the ecological roles of this heterogeneity, including division of labor and bet-hedging.
  • To challenge the traditional view of QS as solely a cell-density switch.

Main Methods:

  • This is a perspective article, synthesizing existing knowledge and proposing new interpretations.
Keywords:
Cell biologyMicrobiology

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  • It focuses on theoretical implications and potential biological functions of QS heterogeneity.
  • No new experimental data were generated.

    • Main Results:

    • QS can lead to phenotypic heterogeneity, creating distinct bacterial subpopulations.
    • This heterogeneity supports specialized functions and division of labor within bacterial communities.
    • QS-mediated heterogeneity can be viewed as a mechanism for "bet-hedging" against environmental changes.

    Conclusions:

    • QS systems are capable of generating complex behaviors beyond simple density-dependent regulation.
    • QS-driven phenotypic heterogeneity can lead to the emergence of sophisticated "bacterial civilizations".
    • Rethinking bacterial communities requires acknowledging the role of QS in fostering specialization and resilience.