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Related Experiment Videos

Spatial restriction of cellular differentiation

B Sager1, D Kaiser

  • 1Department of Biochemistry, Beckman Center for Molecular and Genetic Medicine, Stanford University School of Medicine, California 94305.

Genes & Development
|September 1, 1993
PubMed
Summary
This summary is machine-generated.

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Myxococcus xanthus cells form fruiting bodies where outer domain C-signaling initiates spore differentiation. Spore precursors are then transported inward, accumulating in the inner domain for high-level gene expression.

Area of Science:

  • Microbiology
  • Developmental Biology
  • Cell Biology

Background:

  • Myxococcus xanthus cells aggregate into fruiting bodies for differentiation into myxospores.
  • Fruiting bodies exhibit distinct inner and outer domains characterized by cell density and alignment.
  • Cell density and alignment are crucial for C-signal transmission, initiating spore differentiation.

Purpose of the Study:

  • To investigate potential differential roles of inner and outer fruiting body domains in Myxococcus xanthus spore differentiation.
  • To identify genes with domain-specific expression patterns during development.
  • To elucidate the morphogenetic mechanisms underlying spore differentiation and domain-specific gene expression.

Main Methods:

  • Screening of 80 developmentally regulated transcriptional lacZ gene fusions for domain-specific expression.

Related Experiment Videos

  • Microscopic observation of gene fusion expression and spore precursor localization.
  • Reconstruction experiments to assess the mechanical forces exerted by developing rod cells.

    • Main Results:

    • Eight gene fusions showed inner domain-restricted expression, while one (omega 7621) exhibited initial outer domain expression.
    • omega 7621 expression and spore precursors initially appeared in the outer domain and later expanded inward.
    • Developing rod cells possess sufficient force to displace spore precursors, supporting passive transport from outer to inner domains.

    Conclusions:

    • C-signaling in the outer, high-density domain initiates Myxococcus xanthus spore differentiation.
    • Spore precursors are passively transported to the inner domain by the movement of undifferentiated cells.
    • Accumulation of spore precursors in the inner domain leads to high-level expression of spore-specific genes, explaining inner domain-specific expression patterns.