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Related Experiment Videos

Pattern- and growth-linked cell cycles in Drosophila development.

B A Edgar1, J Britton, A F de la Cruz

  • 1Division of Basic Sciences, Fred Hutchinson Cancer Research Center, 1100 Fairview Avenue North, Seattle, WA 98109, USA.

Novartis Foundation Symposium
|July 11, 2001
PubMed
Summary

Drosophila development involves complex cell cycle regulation. Early embryos use G2/M control via String, while later larval stages and imaginal discs integrate G1/S and G2/M checkpoints influenced by growth and patterning signals.

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Area of Science:

  • Developmental Biology
  • Cell Cycle Regulation
  • Molecular Genetics

Background:

  • Cell cycle progression is tightly regulated during Drosophila development.
  • Early embryonic cell cycles are rapid, lack growth, and are controlled at G2/M by String (Cdc25).
  • Later larval and imaginal disc cells exhibit distinct cell cycle regulation influenced by growth and differentiation.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of the cell cycle in different Drosophila developmental stages.
  • To understand how cell cycle transitions are controlled by patterning and growth signals.
  • To investigate the integration of cell specification and metabolism in cell cycle control.

Main Methods:

  • Analysis of gene transcription, specifically the string locus and its cis-regulatory elements.

Related Experiment Videos

  • Investigation of cell cycle regulators like Cdk1-activator, Cdc25/String, Myc, Ras, and phosphatidylinositol-3-kinase.
  • Comparative study of cell cycle regulation in embryonic, larval, and imaginal disc tissues.

    • Main Results:

    • Embryonic cell cycles are regulated at G2/M by patterned String transcription.
    • Larval cell cycles are growth-dependent and regulated at G/S transitions, lacking mitosis.
    • Imaginal disc cells display dual regulation at G1/S (growth-coupled) and G2/M (String-dependent) transitions.

    Conclusions:

    • Drosophila imaginal discs integrate patterning and growth signals for cell cycle control.
    • The dual G1/S and G2/M regulation allows adaptation to diverse developmental inputs.
    • String transcription remains a key G2/M regulator, while G1/S is influenced by growth pathways like Myc and Ras.