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The PARP1-EXD2 axis orchestrates R-loop resolution to safeguard genome stability.

Zhaoshuang Li1,2,3,4, Yu Liu2,3, Yuanhui Liu5

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The study identifies exonuclease 3'–5' domain-containing 2 (EXD2) as a key enzyme that resolves R-loops, structures linked to genome instability and disease. EXD2

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biochemistry

Background:

  • R-loops are dynamic nucleic acid structures formed by RNA-DNA hybrids.
  • Dysregulated R-loops can lead to genome instability and human diseases.
  • Understanding R-loop resolution mechanisms is crucial for cellular health.

Purpose of the Study:

  • To identify key proteins involved in R-loop resolution.
  • To elucidate the mechanism by which R-loops are resolved.
  • To understand the role of R-loop resolution in maintaining genome stability.

Main Methods:

  • Biochemical assays to study protein interactions and enzymatic activity.
  • Cellular experiments to observe R-loop dynamics and genomic stability.
  • Analysis of protein modifications, such as acetylation, in R-loop resolution.

Main Results:

  • EXD2 is identified as a crucial R-loop resolvase.
  • EXD2 is recruited to R-loops via interaction with poly(ADP-ribose) (PAR) polymers synthesized by PARP1.
  • Acetylation of EXD2 at K416 enhances its binding affinity and promotes RNA degradation within R-loops.
  • Loss of EXD2 leads to R-loop accumulation, transcription-replication conflicts, and genomic instability.

Conclusions:

  • EXD2 plays a pivotal role in resolving R-loops by degrading their RNA component.
  • The PARP1-EXD2 axis, regulated by PARylation and acetylation, is essential for maintaining genome stability.
  • Dysfunctional EXD2-mediated R-loop resolution contributes to human pathologies.