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Signaling in unicellular eukaryotes

S T Christensen1, V Leick, L Rasmussen

  • 1Department of Medical Biochemistry and Genetics, Panum Institute, University of Copenhagen, Denmark.

International Review of Cytology
|October 23, 1997
PubMed
Summary
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This review explores intercellular and intracellular signaling in unicellular eukaryotes, comparing them to bacteria and multicellular organisms from an evolutionary viewpoint. It highlights conserved intracellular mechanisms across diverse life forms.

Area of Science:

  • Cell Biology
  • Evolutionary Biology
  • Biochemistry

Background:

  • Unicellular eukaryotes possess complex signaling systems governing vital cellular processes.
  • Understanding these systems provides insights into fundamental biological mechanisms.
  • Comparative analysis with bacteria and metazoa reveals evolutionary conservation.

Purpose of the Study:

  • To review intercellular and intracellular signaling in free-living unicellular eukaryotes.
  • To examine cellular responses from an evolutionary perspective.
  • To investigate intracellular control mechanisms using low-density cell cultures.

Main Methods:

  • Literature review of intercellular and intracellular signaling systems.
  • Comparative analysis across unicellular eukaryotes, bacteria, and metazoa.

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  • Discussion of findings from cell cultures in defined media at low densities.

    • Main Results:

    • Unicellular eukaryotes exhibit sophisticated signaling for survival, proliferation, differentiation, and programmed cell death.
    • Intracellular signaling systems show remarkable commonalities between unicellular and multicellular organisms.
    • Reduced intercellular signaling in low-density cultures illuminates internal cellular control mechanisms.

    Conclusions:

    • Cellular signaling in unicellular eukaryotes is best understood through an evolutionary lens.
    • Conserved intracellular mechanisms underscore the deep evolutionary roots of cellular regulation.
    • Comparative studies reveal fundamental principles of cell communication and control applicable across life.