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Separase prevents genomic instability by controlling replication fork speed.

Francesco Cucco1, Elisa Palumbo2, Serena Camerini3

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Separase, a protease, maintains genomic stability by controlling DNA replication fork speed. Its depletion accelerates fork progression and causes genomic instability, potentially linking to cancer.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Proper chromosome segregation is vital for genomic integrity; errors lead to mis-segregation and potentially cancer.
  • Separase, a protease, cleaves cohesin to separate sister chromatids, a key step in cell division.

Purpose of the Study:

  • To investigate the role of Separase in maintaining genomic stability beyond sister chromatid separation.
  • To explore Separase's potential involvement in controlling DNA replication fork dynamics.

Main Methods:

  • Investigated Separase interaction with replication licensing factors (MCM2-7).
  • Performed genome-wide co-localization studies of Separase, MCM complex, and cohesin.
  • Assessed the effects of Separase depletion on replication fork velocity, cohesin acetylation, and checkpoint response in HeLa and primary fibroblast cells.

Main Results:

  • Separase interacts with MCM2-7 and co-localizes with MCM and cohesin complexes genome-wide.
  • Separase depletion increased replication fork velocity by approximately 1.5-fold.
  • Separase silencing led to increased SMC3 acetylation, altered checkpoint responses, and triggered genomic instability.

Conclusions:

  • Separase plays a novel role in regulating DNA replication fork progression.
  • This Separase-mediated control of fork speed is crucial for maintaining genomic stability.
  • Dysregulation of Separase's function in fork progression may contribute to genomic instability and tumorigenesis.