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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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Direct Restart of a Replication Fork Stalled by a Head-On RNA Polymerase
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Dicer in action at replication-transcription collisions.

Jie Ren1, Stephane E Castel2, Robert A Martienssen1

  • 1Howard Hughes Medical Institute-Gordon and Betty Moore Foundation; Watson School of Biological Sciences; Cold Spring Harbor Laboratory; Cold Spring Harbor , NY, USA.

Molecular & Cellular Oncology
|June 17, 2016
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Summary

Dicer protein prevents genome instability by promoting transcription termination during DNA replication in fission yeast. This discovery reveals a new role for Dicer in maintaining genomic integrity and tumor suppression.

Keywords:
Dicergenome stabilityreplication stresstranscription terminationtumor suppressor

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Genome stability is crucial for preventing diseases like cancer.
  • Transcription-replication collisions pose a significant threat to genome integrity.
  • The precise mechanisms preventing such collisions are not fully understood.

Purpose of the Study:

  • To investigate the role of Dicer in managing transcription-replication conflicts.
  • To elucidate how Dicer contributes to maintaining genome stability at collision sites.
  • To explore the implications of Dicer's function in tumor suppression.

Main Methods:

  • Utilized the fission yeast model organism, Schizosaccharomyces pombe.
  • Employed molecular biology techniques to study Dicer's function in vivo.
  • Analyzed DNA replication dynamics and genome stability markers.

Main Results:

  • Dicer was found to promote transcription termination at sites where transcription and replication forks collide.
  • This Dicer-mediated termination facilitates DNA replication progression.
  • It prevents aberrant replication fork restart, which can lead to homologous recombination and genomic instability.

Conclusions:

  • Dicer plays a critical, previously unrecognized role in safeguarding genome stability.
  • By ensuring proper transcription termination, Dicer prevents DNA damage during replication stress.
  • This function provides a molecular basis for Dicer's established tumor suppressor activity.