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Related Experiment Videos

Activating the DNA damage checkpoint in a developmental context.

T T Su1, J Walker, J Stumpff

  • 1Campus Box 0347, MCD Biology, University of Colorado, Boulder, 80309, USA. tin.su@colorado.edu

Current Biology : CB
|February 19, 2000
PubMed
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DNA damage checkpoints stall cell division differently during development. In Drosophila embryos, X-rays delay mitosis entry, not anaphase, due to cell cycle changes like the G2 phase.

Area of Science:

  • Developmental Biology
  • Cell Cycle Regulation
  • DNA Damage Response

Background:

  • DNA damage checkpoints arrest cell division in unicellular organisms.
  • Metazoan development involves complex processes like gastrulation and gene expression that interact with cell cycle regulation.
  • The effects of DNA damage checkpoint activation during development remain incompletely understood.

Purpose of the Study:

  • To investigate the impact of X-ray-induced DNA damage on cell division during Drosophila melanogaster development.
  • To understand how checkpoint activation is modulated by developmental context, specifically the introduction of a G2 phase.

Main Methods:

  • Irradiation of post-blastoderm Drosophila embryos with X-rays.
  • Analysis of cell cycle progression, focusing on mitosis entry and anaphase.

Related Experiment Videos

  • Examination of gene expression patterns, including the string (Cdc25) gene.
  • Investigation of mitotic cyclin localization and the role of the Cdk1 kinase.

    • Main Results:

    • Irradiation delayed mitosis entry in Drosophila embryos possessing a G2 phase, unlike earlier cycles.
    • Gastrulation and string (Cdc25) gene expression proceeded normally post-irradiation.
    • Mitotic cyclin exclusion from the nucleus accompanied the radiation-induced mitotic delay.
    • A non-phosphorylatable Cdk1 mutant overcame the irradiation-induced mitotic delay.

    Conclusions:

    • Cell cycle changes, such as the G2 phase, dictate checkpoint responses during development.
    • Different mechanisms stall cell division at various developmental stages.
    • Mitotic delay in post-blastoderm embryos is primarily mediated by Cdk1 inhibitory phosphorylation.
    • Developmental processes like gastrulation are robust to cell division delays.