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The RECQL helicase prevents replication fork collapse during replication stress

Bente Benedict1, Marit Ae van Bueren1, Frank Pa van Gemert1

  • 1Division of Tumor Biology and Immunology, The Netherlands Cancer Institute, Amsterdam, The Netherlands.

Life Science Alliance
|August 22, 2020
PubMed

Insights

Replication stress in cancer cells relies on RECQL helicase to protect DNA. Loss of RECQL leads to DNA breaks, highlighting its potential as a cancer therapy target.

Area of Science:

  • Molecular biology
  • Cancer research
  • Genetics

Background:

  • Most tumors lose the G1/S phase checkpoint, becoming insensitive to antigrowth signals.
  • Loss of G1/S control disrupts DNA replication, causing slow fork progression and stalling.
  • Cancer cells may depend on pathways that mitigate replication stress consequences.

Purpose of the Study:

  • Identify vulnerabilities in cells experiencing replication stress.
  • Investigate the role of RECQL helicase in DNA replication under stress.

Main Methods:

  • Conducted an shRNA-based genetic screen to identify essential genes under replication stress.
  • Assessed the impact of RECQL knockdown on DNA double-strand break (DSB) formation in cancer cells.

Main Results:

  • The RECQL helicase was found to be essential under replication stress conditions.
  • RECQL protects stalled replication forks from MRE11-dependent double-strand break (DSB) formation.
  • RECQL knockdown increased DNA DSBs in various cancer cell types.

Conclusions:

  • RECQL is critical for maintaining DNA synthesis during replication stress.
  • RECQL's role in protecting against DNA damage makes it a potential therapeutic target for cancer.

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