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Updated: May 9, 2025

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Oncogene Silencing via ecDNA Micronucleation

Lotte Brückner1,2,3, Robin Xu2,3, Jun Tang4,5

  • 1Max Delbrück Center for Molecular Medicine, Berlin, Germany.

Biorxiv : the Preprint Server for Biology
|May 5, 2025
PubMed

Insights

Extrachromosomal DNA (ecDNA) damage, often from replication stress, causes ecDNA to form micronuclei. This process, involving oncogene amplification, impacts tumor genome evolution and treatment resistance.

Area of Science:

  • Cancer Biology
  • Genetics
  • Cell Biology

Background:

  • Extrachromosomal DNA (ecDNA) drives oncogene amplification in many cancers.
  • ecDNA's non-Mendelian inheritance fuels tumor heterogeneity and treatment resistance.

Purpose of the Study:

  • To investigate how elevated ecDNA levels influence cellular processes, specifically micronucleation.
  • To understand the fate and transcriptional activity of ecDNA during cell division and micronucleation.

Main Methods:

  • Single-cell and live-cell imaging
  • Single-micronucleus sequencing
  • Computational modeling

Main Results:

  • Elevated ecDNA levels predispose cells to micronucleation.
  • Damaged ecDNA detaches during cell division, leading to micronucleus formation.
  • Oncogene-containing ecDNA clusters asymmetrically segregate into daughter cell micronuclei.
  • Micronucleated ecDNA undergoes chromatin remodeling, suppressing oncogene transcription.

Conclusions:

  • Damaged ecDNA contributes to micronucleus formation and altered oncogene expression.
  • Understanding ecDNA's fate in micronuclei offers insights into cancer evolution and therapeutic strategies.

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