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Related Experiment Videos

Developmental commitment in a bacterium.

Jonathan Dworkin1, Richard Losick

  • 1Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA. dworkin@microbiology.columbia.edu

Cell
|May 11, 2005
PubMed
Summary
This summary is machine-generated.

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Bacillus subtilis sporulation involves irreversible cell differentiation. Transcription factors sigma(F) and sigma(E) govern this commitment, ensuring stable cell fates despite nutrient availability.

Area of Science:

  • Microbiology
  • Cell Biology
  • Developmental Biology

Background:

  • Sporulation in Bacillus subtilis is a complex differentiation process initiated by nutrient limitation.
  • This process involves the asymmetric division of a cell into two distinct compartments: the forespore and the mother cell.
  • Following division, differentiation becomes irreversible, meaning neither cell can resume growth even with nutrient availability.

Purpose of the Study:

  • To investigate the molecular mechanisms governing developmental commitment during Bacillus subtilis sporulation.
  • To identify the key transcription factors and genes involved in ensuring irreversible differentiation.
  • To understand how cell fate decisions are maintained irrespective of external environmental changes.

Main Methods:

Related Experiment Videos

  • Analysis of transcription factor activation (sigma(F) and sigma(E)) in forespore and mother cell compartments.
  • Investigation of the roles of spoIIQ and spoIIP genes in developmental commitment.
  • Experimental manipulation of gene presence/absence to observe effects on cell growth and differentiation.

    • Main Results:

    • Developmental commitment is regulated by transcription factors sigma(F) (in the forespore) and sigma(E) (in the mother cell).
    • The spoIIQ gene, controlled by sigma(F), and the spoIIP gene, controlled by both sigma(F) and sigma(E), are crucial for commitment.
    • Absence of SpoIIQ and SpoIIP allows forespore growth, while absence of SpoIIP alone permits mother cell growth, indicating their role in blocking resumption of growth.

    Conclusions:

    • Developmental commitment in Bacillus subtilis is a tightly regulated process essential for maintaining distinct cell fates during sporulation.
    • Transcription factors sigma(F) and sigma(E), along with genes spoIIQ and spoIIP, orchestrate irreversible differentiation.
    • This single-celled organism's developmental commitment mechanism parallels that observed in multicellular organisms, ensuring differentiation stability.