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Related Experiment Videos

High-frequency switching in Dictyostelium.

B Kraft1, D Steinbrech, M Yang

  • 1Department of Biology, University of Iowa, Iowa City 52242.

Developmental Biology
|November 1, 1988
PubMed
Summary

Dictyostelium discoideum exhibits a high-frequency switching system affecting colony morphology and development. This system shows heritable switch phenotypes, influenced by UV light and interconvertibility between variants.

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Area of Science:

  • Cellular and Molecular Biology
  • Developmental Biology
  • Microbiology

Background:

  • Dictyostelium discoideum is a model organism for studying cellular differentiation and development.
  • Phenotypic variation and switching behaviors are observed in microbial populations, impacting population dynamics and evolution.

Purpose of the Study:

  • To demonstrate and characterize a high-frequency switching system in Dictyostelium discoideum.
  • To identify the key features and properties of this switching system.
  • To compare the observed switching system with similar phenomena in other organisms, such as Candida albicans.

Main Methods:

  • Colony morphology analysis to distinguish switch phenotypes.
  • Assessment of developmental timing and morphogenesis.
  • Quantification of spontaneous switching frequencies in parent and variant strains.
  • Evaluation of ultraviolet light's effect on switching frequency.
  • Analysis of interconvertibility and reversion frequencies between phenotypes.
  • Heritability studies of switch phenotypes.

Main Results:

  • A high-frequency switching system was identified in Dictyostelium discoideum.
  • Switch phenotypes are characterized by altered colony morphology, developmental timing, and morphogenesis.
  • The system exhibits low spontaneous switching (10^-2) in parent strains, inducible by UV light.
  • Variant strains show high spontaneous switching (up to 10^-1), with frequent interconversion and reversion.
  • Switch phenotypes are reproducible, heritable, and correlate with switching frequency.

Conclusions:

  • Dictyostelium discoideum possesses a complex, high-frequency switching system with significant implications for phenotypic plasticity.
  • The characterized switching system shares remarkable similarities with that of Candida albicans, suggesting conserved mechanisms.
  • Further research into this system could elucidate fundamental principles of phenotypic variation and adaptation in eukaryotes.

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