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Commitment to division in ciliate cell cycles

S M Adl1, J D Berger

  • 1Department of Zoology, University of British Columbia, Vancouver, Canada.

The Journal of Eukaryotic Microbiology
|March 1, 1996
PubMed
Summary
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Ciliates irreversibly commit to cell division at oral polykinetid assembly and micronuclear anaphase, requiring cell mass/DNA ratio and stomatogenesis. This checkpoint involves cyclin-dependent kinases (CDKs) and precedes major cytoskeletal changes for cell division.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Eukaryotic Cell Division

Background:

  • Ciliates undergo irreversible cell division commitment late in the cell cycle.
  • This commitment is linked to oral polykinetid assembly and micronuclear anaphase.
  • A threshold cell mass/DNA ratio and stomatogenesis are prerequisites for commitment.

Purpose of the Study:

  • To review and speculate on the regulatory mechanisms of pre-fission morphogenesis and cell division in ciliates.
  • To highlight the role of cell cycle checkpoints and cytoskeletal modifications in ciliate reproduction.

Main Methods:

  • Literature review and synthesis of existing research on ciliate cell cycle regulation.
  • Comparative analysis of cell division processes and mutants across different ciliate species.

Related Experiment Videos

  • Speculative modeling of regulatory pathways based on known eukaryotic cell cycle mechanisms.

    • Main Results:

    • Cell division commitment in ciliates is a checkpoint regulated by cell mass/DNA ratio and stomatogenesis.
    • Cyclin-dependent kinases (CDKs), including P34 kD and P36 kD kinases, are involved in this transition.
    • Cytoskeletal modifications crucial for organelle separation, cortex morphogenesis, and cytokinesis occur post-commitment.
    • The cc1 mutant in Paramecium is unique in affecting cell cycle progression before commitment.

    Conclusions:

    • The irreversible commitment point in ciliates is a critical checkpoint involving conserved eukaryotic cell cycle regulators like CDKs.
    • Post-commitment, significant cytoskeletal rearrangements facilitate the physical separation and morphogenesis required for cell division.
    • Understanding these regulatory mechanisms provides insight into the fundamental processes governing eukaryotic cell proliferation and development.