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Related Concept Videos

Gene Regulation in Microbial Communities: Quorum Sensing01:28

Gene Regulation in Microbial Communities: Quorum Sensing

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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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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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Gene Regulation During Sporulation01:17

Gene Regulation During Sporulation

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Sporulation is a complex developmental process that allows certain Gram-positive bacteria, such as Bacillus subtilis and Clostridium species, to survive extreme environmental conditions. This process is tightly regulated by a series of signaling cascades and transcriptional controls, ensuring the formation of a highly resistant endospore.Sporulation is triggered by unfavorable conditions, such as nutrient depletion, and is governed by a phosphorelay system. One of the sensor kinases, such as...
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Master Transcription Regulators02:23

Master Transcription Regulators

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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...
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Prokaryotic Transcriptional Activators and Repressors01:58

Prokaryotic Transcriptional Activators and Repressors

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The organization of prokaryotic genes in their genome is notably different from that of eukaryotes. Prokaryotic genes are organized, such that the genes for proteins involved in the same biochemical process or function are located together in groups. This group of genes, along with their regulatory elements, are collectively known as an operon. The functional genes in an operon are transcribed together to give a single strand of mRNA known as polycistronic mRNA.
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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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Related Experiment Video

Updated: Mar 10, 2026

Fluorescence Live-cell Imaging of the Complete Vegetative Cell Cycle of the Slow-growing Social Bacterium Myxococcus xanthus
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Fluorescence Live-cell Imaging of the Complete Vegetative Cell Cycle of the Slow-growing Social Bacterium Myxococcus xanthus

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Highly Signal-Responsive Gene Regulatory Network Governing Myxococcus Development.

Lee Kroos1

  • 1Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, USA.

Trends in Genetics : TIG
|December 6, 2016
PubMed
Summary

Myxococcus xanthus bacteria form multicellular mounds and spores when starved. Their gene regulatory networks (GRNs) integrate various signals, differing from other bacteria, suggesting unique evolutionary pathways for complex development.

Keywords:
Myxococcus xanthusbacterial developmentgene regulatory networksignal transductionsporulation

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Fluorescence Live-cell Imaging of the Complete Vegetative Cell Cycle of the Slow-growing Social Bacterium Myxococcus xanthus
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Area of Science:

  • Microbiology
  • Developmental Biology
  • Evolutionary Biology

Background:

  • Myxococcus xanthus exhibits complex multicellular development, including mound formation and spore differentiation upon starvation.
  • Understanding the underlying gene regulatory networks (GRNs) is crucial for deciphering developmental processes.
  • Its genetic tractability makes M. xanthus a valuable model for studying GRN evolution.

Purpose of the Study:

  • To investigate the structure and function of the gene regulatory network (GRN) governing multicellular development in Myxococcus xanthus.
  • To identify the roles of intracellular and extracellular signals in regulating transcriptional activators within the GRN.
  • To compare the M. xanthus GRN with those of other sporulating bacteria to understand evolutionary divergence.

Main Methods:

  • Analysis of existing research on Myxococcus xanthus development and gene regulation.
  • Review of studies identifying signal-responsive transcriptional activators.
  • Comparative analysis of GRNs across different bacterial species.

Main Results:

  • The M. xanthus GRN comprises interconnected cascades of signal-responsive transcriptional activators.
  • Both starvation-induced intracellular signals and self-generated extracellular cues regulate gene expression and activator activity.
  • Activators function combinatorially, enabling complex signal integration.
  • The M. xanthus GRN shows significant divergence from those of Bacillus and Streptomyces.

Conclusions:

  • Myxococcus xanthus possesses a highly signal-responsive GRN that facilitates its complex multicellular development.
  • The unique GRN structure suggests a distinct evolutionary trajectory for developmental regulation in this bacterium.
  • Further research is needed to identify signals for all transcriptional activators in the M. xanthus GRN.