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Restarting Stalled Replication Forks02:37

Restarting Stalled Replication Forks

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DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...
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An organism’s genome needs to be duplicated in an efficient and error-free manner for its growth and survival. The replication fork is a Y-shaped active region where two strands of DNA are separated and replicated continuously. The coupling of DNA unzipping and complementary strand synthesis is a characteristic feature of a replication fork.   Organisms with small circular DNA, such as E. coli, often have a single origin of replication; therefore, they have only two replication...
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In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
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Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
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The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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PLK1 phosphorylates WRN at replication forks.

Lei Wang1, Daheng He2, Qianjin Li1

  • 1Department of Toxicology and Cancer Biology, University of Kentucky, Lexington, Kentucky.

The Journal of Pharmacology and Experimental Therapeutics
|March 1, 2025
PubMed
Summary

Polo-like kinase 1 (PLK1) phosphorylation of Werner syndrome protein (WRN) regulates DNA repair, enhancing prostate cancer radiotherapy efficacy. This finding guides strategies to improve cancer treatment outcomes.

Keywords:
DNA replicationPLK1WRN

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • DNA Repair Mechanisms

Background:

  • Prostate cancer, especially castration-resistant forms, poses a significant health challenge.
  • Current treatments like androgen signaling inhibitors have limitations, necessitating new therapeutic targets.
  • Polo-like kinase 1 (PLK1) is implicated in prostate cancer progression and resistance to therapies.

Purpose of the Study:

  • To investigate the role of PLK1 in regulating DNA repair pathways relevant to prostate cancer.
  • To determine if PLK1 influences the efficacy of radiotherapy by modulating DNA double-strand break repair.
  • To elucidate the mechanism by which PLK1 affects DNA end resection and repair pathway choice.

Main Methods:

  • Investigated PLK1's interaction with Werner syndrome protein (WRN) in the context of DNA double-strand breaks.
  • Utilized nonphosphorylatable WRN mutants to assess the impact of PLK1-mediated phosphorylation on DNA resection.
  • Analyzed cellular choices between nonhomologous end joining (NHEJ) and homologous recombination (HR) DNA repair pathways.

Main Results:

  • PLK1-associated phosphorylation of WRN is crucial for regulating long-range DNA end resection at double-strand breaks.
  • This phosphorylation promotes homologous recombination (HR) repair and maintains chromosome stability.
  • Impaired WRN phosphorylation leads to reduced resection, increased NHEJ, and phenotypes similar to WRN-deficient cells.

Conclusions:

  • PLK1-mediated phosphorylation of WRN and the Mre11-Rad50-Nbs1 complex promotes DNA end resection.
  • This process influences the cellular choice of DNA double-strand break repair pathways.
  • Targeting PLK1 could enhance the efficacy of radiotherapy for prostate cancer by modulating DNA repair.