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XRN2 Links RNA:DNA Hybrid Resolution to Double Strand Break Repair Pathway Choice.

Tuyen T Dang1, Julio C Morales2

  • 1Department of Neurosurgery, University of Oklahoma Health Science Center, Oklahoma City, OK 73104, USA.

Cancers
|July 11, 2020
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Summary

The exoribonuclease XRN2 is crucial for DNA double-strand break repair initiation via non-homologous end-joining. It also impacts homologous recombination, suggesting a link between RNA:DNA hybrid resolution and DNA repair pathway choice.

Keywords:
RNA:DNA hybridshomologous recombinationnon-homologous end-joining

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The 5' to 3' exoribonuclease XRN2 plays a role in DNA damage response.
  • XRN2 deficiency impairs DNA double-strand break (DSB) repair through non-homologous end-joining (NHEJ).
  • The precise mechanisms of XRN2 in NHEJ remain unclear.

Purpose of the Study:

  • To elucidate the mechanistic role of XRN2 in DNA DSB repair pathways.
  • To investigate how XRN2 influences the choice between NHEJ and homologous recombination (HR).

Main Methods:

  • Investigated XRN2's function in DNA repair using molecular biology techniques.
  • Assessed Ku70 binding to DNA ends in the presence or absence of XRN2.
  • Utilized RNaseH1 overexpression to remove RNA:DNA hybrids.
  • Analyzed DSB repair efficiency in different genetic backgrounds.

Main Results:

  • XRN2-mediated resolution of RNA:DNA hybrids is essential for Ku70 binding to DNA ends, initiating NHEJ.
  • Loss of XRN2 reduces the efficiency of homologous recombination repair.
  • RNA:DNA hybrid accumulation at DSB sites, potentially from unregulated transcription, inhibits HR.
  • Overexpression of RNaseH1 did not restore HR in XRN2-deficient cells, indicating other factors are involved.

Conclusions:

  • XRN2 is critical for initiating NHEJ by resolving RNA:DNA hybrids.
  • Unresolved RNA:DNA hybrids can impede HR repair.
  • XRN2 activity influences the decision-making process in DNA DSB repair pathway selection.