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Related Experiment Videos

Fruiting body formation by Bacillus subtilis.

S S Branda1, J E González-Pastor, S Ben-Yehuda

  • 1Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA 02115, USA.

Proceedings of the National Academy of Sciences of the United States of America
|September 27, 2001
PubMed
Summary
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Bacillus subtilis spore formation in biofilms reveals unexpected spatial organization. Natural isolates show multicellularity, unlike lab strains, suggesting lost complexity during domestication.

Area of Science:

  • Microbiology
  • Cellular Differentiation
  • Biofilm Formation

Background:

  • Spore formation in Bacillus subtilis is a model for cellular differentiation, typically studied at the single-cell level.
  • Previous research has not fully explored the spatial organization of sporulation within complex microbial communities.

Purpose of the Study:

  • To investigate the spatial organization of Bacillus subtilis spore formation within biofilms.
  • To identify genetic and phenotypic factors contributing to this spatial organization.
  • To compare sporulation in natural isolates versus laboratory strains.

Main Methods:

  • Analysis of Bacillus subtilis in structured, surface-associated communities (biofilms).
  • Observation of cellular differentiation into chains and aerial structures (fruiting bodies).

Related Experiment Videos

  • Genetic analysis of regulatory and production genes involved in fruiting body formation.

    • Main Results:

    • Spore formation exhibits unexpected spatial organization within biofilms, forming aerial structures (fruiting bodies).
    • Fruiting body formation is dependent on specific regulatory genes and genes for exopolysaccharide and surfactin production.
    • Natural isolates demonstrated robust aerial structure formation, unlike laboratory strains, indicating a loss of multicellular traits in domesticated strains.

    Conclusions:

    • Bacillus subtilis spore formation in biofilms is a multicellular process with distinct spatial organization.
    • Multicellular behaviors, including aerial structure formation, may have been lost in laboratory strains during domestication.
    • Other microbial differentiation processes may also exhibit multicellular spatial organization when studied in natural isolates.