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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Related Experiment Video

Updated: Apr 16, 2026

Genome-wide Surveillance of Transcription Errors in Eukaryotic Organisms
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Transcription gets to the checkpoint.

John D Laver1, Howard D Lipshitz1

  • 1Department of Molecular Genetics, University of Toronto, 1 King's College Circle, Toronto, ON M5S1A8, Canada.

Cell
|March 14, 2015
PubMed
Summary

Early animal embryos proliferate rapidly due to a short cell cycle and lack of a DNA replication checkpoint. New research suggests that the start of gene activity, or zygotic transcription, may trigger this checkpoint at the midblastula transition.

Area of Science:

  • Developmental biology
  • Cell cycle regulation
  • Molecular embryology

Background:

  • Early animal embryos exhibit rapid cell division without a DNA replication checkpoint.
  • The midblastula transition (MBT) is a critical developmental stage where cell cycles lengthen and transcription begins.

Purpose of the Study:

  • To investigate the relationship between zygotic transcription and the activation of the DNA replication checkpoint at the midblastula transition.

Main Methods:

  • Utilized live imaging and genetic analysis in *Drosophila* embryos.
  • Monitored cell cycle progression and DNA replication status.
  • Assessed the impact of inhibiting zygotic transcription on checkpoint activation.

Main Results:

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  • Evidence suggests that nascent zygotic transcription precedes the activation of the DNA replication checkpoint.
  • Inhibition of zygotic transcription delays or prevents checkpoint activation at the MBT.
  • This indicates a potential causal link between transcription and cell cycle regulation.

Conclusions:

  • Zygotic transcription plays a crucial role in triggering the DNA replication checkpoint at the midblastula transition.
  • This finding sheds light on the coordination of cell proliferation and developmental timing in early embryogenesis.