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DNA2 enables growth by restricting recombination-restarted replication.

Jessica J R Hudson1, Rowin Appanah1, David Jones1,2

  • 1Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Brighton, UK.

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DNA2 is crucial for cell proliferation by preventing harmful DNA recombination at stalled replication forks. Its loss triggers cell-cycle arrest, explaining growth failure in DNA2-related dwarfism disorders.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • DNA2 is a nuclease-helicase essential for genome stability and cell proliferation across species.
  • Mutations in DNA2 cause primordial dwarfism syndromes, while cancer cells overexpress it.
  • The precise roles of DNA2 in cell proliferation and disease pathogenesis are not fully understood.

Purpose of the Study:

  • To elucidate the mechanism by which DNA2 prevents cell proliferation defects.
  • To understand the molecular basis of DNA2-linked genetic disorders.
  • To investigate the role of DNA2 in regulating DNA replication and checkpoint activation.

Main Methods:

  • Utilized yeast and human cell models.
  • Investigated DNA2's function in suppressing homologous recombination at stalled replication forks.
  • Analyzed DNA synthesis, RPA-bound single-stranded DNA accumulation, and cell-cycle progression upon DNA2 depletion.

Main Results:

  • DNA2 suppresses homologous recombination-restarted replication and checkpoint activation at stalled forks.
  • Loss of DNA2 leads to recombination-dependent DNA synthesis and RPA-ssDNA accumulation in G2 phase.
  • DNA2 deprivation triggers the DNA damage checkpoint, causing ATR-p21-dependent cell-cycle exit.

Conclusions:

  • DNA2 is essential for cell proliferation by restricting recombination at stalled replication forks, preventing cellular senescence.
  • Replication fork processing to limit recombination is critical for avoiding senescence.
  • This mechanism provides a framework for understanding growth failure in DNA2-linked primordial dwarfism.