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PrimPol is required for replication reinitiation after mtDNA damage.

Rubén Torregrosa-Muñumer1, Josefin M E Forslund2, Steffi Goffart1

  • 1Department of Environmental and Biological Sciences, University of Eastern Finland, 80101 Joensuu, Finland.

Proceedings of the National Academy of Sciences of the United States of America
|October 27, 2017
PubMed
Summary
This summary is machine-generated.

Eukaryotic PrimPol (PrimPol) restarts stalled mitochondrial DNA replication and primes replication from new origins. This research clarifies mitochondrial stress response and lagging-strand replication complexities.

Keywords:
DNA repairfork rescuemtDNA damagemtDNA replication

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Area of Science:

  • Mitochondrial DNA replication
  • DNA repair mechanisms
  • Molecular biology

Background:

  • Eukaryotic PrimPol (PrimPol) is a dual-function enzyme with primase and polymerase activity.
  • PrimPol is essential for repriming stalled nuclear replication forks.
  • Its function in mitochondria remained largely unknown.

Purpose of the Study:

  • To investigate the role of PrimPol in mitochondrial DNA (mtDNA) replication.
  • To determine if PrimPol can resolve replicative stress in mitochondria.
  • To elucidate PrimPol's contribution to mtDNA lagging-strand synthesis.

Main Methods:

  • In vivo studies using cellular models.
  • In vitro biochemical assays with purified PrimPol.
  • Analysis of mtDNA replication initiation and progression.

Main Results:

  • PrimPol was demonstrated to reinitiate stalled mtDNA replication forks in vivo and in vitro.
  • PrimPol can initiate mtDNA replication from noncanonical origins.
  • These activities provide a mechanism for coping with mitochondrial replicative stress.

Conclusions:

  • PrimPol plays a crucial role in maintaining mtDNA integrity under stress.
  • The findings explain previously controversial aspects of mtDNA lagging-strand replication.
  • PrimPol is a key enzyme for mitochondrial DNA homeostasis and repair.