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Human AAA+ ATPase FIGNL1 suppresses RAD51-mediated ultra-fine bridge formation.

Kenichiro Matsuzaki1, Akira Shinohara2, Miki Shinohara1,3

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The AAA+ ATPase FIGNL1 removes RAD51 filaments to prevent genome instability. FIGNL1 knockout cells accumulate RAD51, leading to ultra-fine chromosome bridges and genomic instability.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • RAD51 filament assembly and disassembly are tightly regulated.
  • RAD51 is essential for DNA repair and replication fork protection.
  • Dysregulated RAD51 activity can lead to genome instability.

Purpose of the Study:

  • Investigate the role of FIGNL1 in suppressing RAD51-mediated genome instability.
  • Elucidate the mechanism by which FIGNL1 regulates RAD51 disassembly.
  • Determine the physiological consequences of persistent RAD51.

Main Methods:

  • Utilized FIGNL1 knockout human cell lines.
  • Analyzed RAD51 dissociation dynamics after replication fork restart.
  • Characterized the formation of ultra-fine chromosome bridges (UFBs).

Main Results:

  • FIGNL1 knockout cells showed impaired RAD51 dissociation and accumulated UFBs.
  • UFB formation was dependent on RAD51 persistence, not replication fork stalling.
  • FIGNL1 suppresses RAD51-mediated UFBs at repetitive genomic regions.

Conclusions:

  • Persistent RAD51 induces sister chromatid linkages and genome instability.
  • FIGNL1 facilitates RAD51 filament disassembly, preventing abnormal recombination intermediates and UFBs.
  • FIGNL1 is crucial for maintaining genome stability by actively removing RAD51 post-replication fork repair.