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Updated: May 9, 2025

In Situ Labeling of Mitochondrial DNA Replication in Drosophila Adult Ovaries by EdU Staining
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R-loop control and mitochondrial genome stability require the 5'-3' exonuclease/flap endonuclease OEX1.

Déborah Schatz1, Anaïs Le Blevenec1, Fabio G Moratti2

  • 1CNRS, Institut de Biologie Moléculaire des Plantes, University of Strasbourg, Strasbourg, France.

The Plant Cell
|May 5, 2025
PubMed
Summary
This summary is machine-generated.

Plant organelle genomes rely on ORGANELLAR EXONUCLEASES 1 (OEX1) to maintain stability. OEX1 compensates for missing DNA polymerase functions, degrading RNA structures to prevent mitochondrial DNA instability.

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Area of Science:

  • Plant Biology
  • Molecular Biology
  • Genetics

Background:

  • Plant organelle genome maintenance relies on factors inherited from bacterial ancestors.
  • Bacterial DNA polymerase I (Pol I) has essential replication/repair domains absent in plant organellar polymerases.

Purpose of the Study:

  • To investigate the function of ORGANELLAR EXONUCLEASES 1 and 2 (OEX1 and OEX2) in compensating for missing DNA polymerase domains in plant organelles.
  • To understand the role of OEX1 in mitochondrial DNA (mtDNA) stability and repair.

Main Methods:

  • Characterization of OEX1 and OEX2 in Arabidopsis thaliana.
  • Analysis of oex1 mutant phenotypes, including developmental and fertility defects.
  • Assessing the impact of OEX1 activity and alternative splicing on mtDNA stability.
  • Investigating OEX1's enzymatic activities, including RNA-DNA hybrid degradation.

Main Results:

  • Loss of OEX1 leads to developmental and fertility defects, exacerbated by mtDNA subgenome segregation.
  • OEX1 activity is modulated by alternative splicing, affecting mtDNA stability.
  • OEX1 exhibits 5'-3'-exonuclease and flap endonuclease activities, degrading RNA in Okazaki-like structures and R-loops.
  • oex1 mutants accumulate RNA-DNA hybrids in transcribed mtDNA regions, indicating a role in R-loop suppression.

Conclusions:

  • OEX1 compensates for missing activities in plant organellar polymerases.
  • OEX1 plays crucial roles in processing replication and recombination intermediates.
  • OEX1 prevents mtDNA instability by degrading RNA primers and suppressing R-loops.