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The zebrafish midblastula transition

D A Kane1, C B Kimmel

  • 1Institute of Neuroscience, University of Oregon, Eugene 97403.

Development (Cambridge, England)
|October 1, 1993
PubMed
Summary
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The zebrafish midblastula transition (MBT) is governed by the nucleocytoplasmic ratio, not a timer. This ratio controls cell cycle lengthening and synchrony loss, operating cell-autonomously from ancestors.

Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • The zebrafish midblastula transition (MBT) marks a critical developmental stage.
  • Early zebrafish development involves rapid, synchronous cell cycles controlled by a 15-minute oscillator.
  • Key MBT events include cell cycle lengthening, loss of synchrony, transcription activation, and cell motility.

Purpose of the Study:

  • To investigate the regulatory mechanism timing the zebrafish midblastula transition (MBT).
  • To determine if the nucleocytoplasmic ratio governs MBT timing, replacing the early oscillator.
  • To explore the cell-autonomous nature of MBT timing.

Main Methods:

  • Utilizing zebrafish as a model organism.
  • Employing cell labeling techniques to track clonal cell behavior.

Related Experiment Videos

  • Analyzing cell cycle duration and blastomere volume in relation to developmental timing.

    • Main Results:

    • The nucleocytoplasmic ratio, rather than a timer, appears to govern the MBT.
    • Cell cycle lengthening during MBT is cell-autonomous, depending on lineal ancestors.
    • Blastomere volume correlates with cell cycle length post-MBT, indicating continued nucleocytoplasmic ratio regulation.

    Conclusions:

    • The nucleocytoplasmic ratio is the primary determinant of cell cycle timing during the zebrafish MBT.
    • Cell cycle regulation during the 'MBT period' is influenced by blastomere size and lineage.
    • Understanding MBT timing provides insights into fundamental developmental control mechanisms.