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Replication Termination Factor 2 (RTF2) controls RNase H2 localization during DNA replication. Persistent RTF2 and RNase H2 impede restart, but PRIM1 enables direct restart.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • The replisome coordinates DNA replication, adapting to genomic challenges and lesions.
  • Proteasome shuttle proteins (DDI1/2) regulate Replication Termination Factor 2 (RTF2) at stalled replication forks for stabilization and restart.

Purpose of the Study:

  • To investigate the role of RTF2 in unperturbed DNA replication and its interaction with RNase H2.
  • To elucidate the mechanisms of replication restart at stalled forks involving RTF2, RNase H2, and PRIM1.

Main Methods:

  • Investigated RTF2's role in regulating RNase H2 localization during replication.
  • Assessed the impact of RTF2 and RNase H2 on replication speed and fork restart.
  • Examined the dependency of replication restart on PRIM1.

Main Results:

  • During unperturbed replication, RTF2 regulates the localization of RNase H2, an enzyme removing RNA from RNA-DNA heteroduplexes.
  • Both RTF2 and RNase H2 are essential for mammalian development and maintaining replication speed.
  • Persistent RTF2 and RNase H2 at stalled forks hinder replication restart, which is facilitated by PRIM1.

Conclusions:

  • RTF2 plays a crucial role in regulating replication-coupled ribonucleotide removal.
  • PRIM1 mediates direct replication restart in mammalian cells, highlighting a novel pathway.