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Related Concept Videos

Bacterial Signaling01:30

Bacterial Signaling

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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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Gene Regulation in Microbial Communities: Quorum Sensing01:28

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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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Yeast Signaling01:28

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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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Bacterial growth is closely tied to nutrient availability, with cells proliferating exponentially under favorable conditions and entering a stationary phase when resources become scarce. This transition is mediated by a regulatory mechanism known as the stringent response, which allows bacteria to adapt to nutrient deprivation by modulating gene expression and metabolic activity.During nutrient scarcity, intracellular amino acid levels decline. It results in the accumulation of uncharged tRNAs...
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Dishonest Signaling in Microbial Conflicts.

Ihab Hashem1, Jan F M Van Impe1

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Summary

Bacteria can gain an advantage by releasing quorum signals without sensing them, disrupting competitor communication. This "dishonest signaling" forces competitors to invest more in signaling to maintain fitness.

Keywords:
bacterial social interactionsindividual based modelingmathematical modelingquorum sensingsignaling theory

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Area of Science:

  • Microbiology
  • Evolutionary Biology
  • Theoretical Ecology

Background:

  • Bacteria utilize quorum sensing for cell-cell communication, coordinating gene expression at high cell densities.
  • Some bacterial strains release quorum signals but lack the ability to sense them, a phenomenon termed 'dishonest signaling'.

Purpose of the Study:

  • To investigate the ecological advantages of 'dishonest signaling' in bacterial competition using mathematical modeling.
  • To analyze the impact of 'dishonest signaling' on the fitness of quorum sensing bacteria.
  • To introduce and apply the concept of the Least Expensive Reliable Signal (LERS) in this context.

Main Methods:

  • Mathematical modeling
  • Signaling theory
  • Ecological competition analysis

Main Results:

  • Bacterial species releasing signals without sensing them can reduce competitors' ability to optimize phenotype expression.
  • Quorum sensing bacteria incur a strategic signaling cost to maintain fitness against 'dishonest signaling' strains.
  • The metabolic investment in signaling by quorum sensing bacteria is influenced by the properties of the regulated phenotype.

Conclusions:

  • 'Dishonest signaling' represents a viable evolutionary strategy in bacterial competition.
  • Quorum sensing bacteria must adapt their signaling investment to counteract the effects of 'dishonest signalers'.
  • The LERS framework provides insights into the evolution of signaling strategies under competitive pressures.