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Related Concept Videos

Gene Regulation During Sporulation01:17

Gene Regulation During Sporulation

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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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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Prokaryotic Transcriptional Activators and Repressors01:58

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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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Transcriptional Regulation: Riboswitches

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Monitoring Intraspecies Competition in a Bacterial Cell Population by Cocultivation of Fluorescently Labelled Strains
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Published on: January 18, 2014

Condition-dependent transcriptome reveals high-level regulatory architecture in Bacillus subtilis.

Pierre Nicolas1, Ulrike Mäder, Etienne Dervyn

  • 1INRA, UR1077, Mathématique Informatique et Génome, Jouy-en-Josas, France.

Science (New York, N.Y.)
|March 3, 2012
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Summary

This study maps Bacillus subtilis transcriptomes under various conditions, revealing how RNA polymerase sigma factors control gene expression and identifying sources of antisense RNA. Understanding bacterial adaptation is key to predicting microbial behavior.

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Area of Science:

  • Microbiology
  • Genomics
  • Molecular Biology

Background:

  • Bacteria dynamically adjust transcriptomes to environmental cues.
  • The full extent of bacterial transcriptional regulation remains incompletely understood.
  • Bacillus subtilis serves as a model organism for studying bacterial adaptation.

Purpose of the Study:

  • To comprehensively map the Bacillus subtilis transcriptome under diverse environmental conditions.
  • To identify and classify promoter regions and their associated regulons.
  • To investigate the origins of antisense RNAs in bacterial transcriptomes.

Main Methods:

  • Global transcriptome profiling of Bacillus subtilis.
  • Identification and mapping of transcription units (TUs).
  • Classification of promoters into sigma factor-controlled regulons.

Main Results:

  • Successfully mapped transcription units and classified 2935 promoters into regulons.
  • RNA polymerase sigma factors accounted for approximately 66% of transcriptional activity variance.
  • A significant portion of antisense RNAs originated from spurious transcription initiation and imperfect termination control.

Conclusions:

  • Provides a global view of Bacillus subtilis transcriptional regulation.
  • Highlights the crucial role of sigma factors in bacterial adaptation.
  • Identifies novel insights into the generation of antisense RNAs.