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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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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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The deep ocean and its underlying sediments represent vast, largely unexplored microbial habitats that extend far beyond the sunlit photic zone. The photic (euphotic) zone typically spans the upper ~100–200 meters of pelagic waters in the open ocean, but its depth varies geographically and seasonally, where sufficient light supports photosynthetic life. Below this lies the deep sea, spanning roughly 1000–6000 meters (bathypelagic to abyssal zones), with deeper hadal trenches...
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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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Crenarchaeota, a prominent phylum of Archaea, is remarkable for its ability to thrive in extreme environments characterized by high temperatures and acidity. These microorganisms inhabit sulfuric hot springs, volcanic systems, and submarine hydrothermal vents, where temperatures often exceed 100°C. The unique adaptations of Crenarchaeota not only allow survival under such extreme conditions but also provide insights into the mechanisms of life in primordial Earth-like...
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Quorum sensing in extreme environments.

Kate Montgomery1, James C Charlesworth2, Rebecca LeBard3

  • 1School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia. katemontg@gmail.com.

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Summary

Microbial communication, including quorum sensing, is vital for gene regulation and survival in extreme environments. Understanding these signaling systems offers insights into microbial interactions and ecosystem function on early Earth.

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Area of Science:

  • Microbiology
  • Environmental Science
  • Evolutionary Biology

Background:

  • Microbial communication, especially quorum sensing, regulates gene expression in diverse organisms.
  • Quorum sensing is well-studied in virulence but less understood in extreme environments.
  • Cell signaling is crucial for microbial processes, functional diversity, and ecosystem function.

Purpose of the Study:

  • To review the role of microbial communication in extreme environments.
  • To explore how cell signaling impacts microbial survival and function in harsh conditions.
  • To connect microbial signaling in modern extreme environments to early Earth conditions.

Main Methods:

  • Review of recent studies on cell signaling in microbial mats (analogs to early Earth communities).
  • Analysis of microbial interactions and survival strategies in extreme settings.
  • Examination of quorum sensing in archaea and potential inter-domain communication.

Main Results:

  • Cell signaling is fundamental and may have co-evolved with early Earth conditions.
  • Microbial communication is key to understanding the unexpected distribution of microbial groups in extreme environments.
  • Quorum sensing has been newly identified in archaea, suggesting multi-level communication in extremophiles.

Conclusions:

  • Microbial communication is essential for microbial life and evolution in extreme environments.
  • Studying cell signaling in extremophiles provides insights into early life and ecosystem dynamics.
  • Inter-domain communication may be a fundamental aspect of microbial communities in extreme habitats.