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The cGAS-Ku80 complex regulates the balance between two end joining subpathways.

Haiping Zhang1, Lijun Jiang1, Xinyi Du2

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Nuclear cyclic GMP-AMP synthase (cGAS) balances DNA repair pathways. It promotes canonical non-homologous end joining (c-NHEJ) while suppressing alternative NHEJ (alt-NHEJ), maintaining genome integrity.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Cyclic GMP-AMP synthase (cGAS) is a primary DNA sensor activating the STING-TBK1 pathway, typically found in the cytosol.
  • Recent studies highlight cGAS's nuclear functions, including its role in inhibiting homologous recombination (HR) after DNA damage.
  • The regulation of non-homologous end joining (NHEJ) by nuclear cGAS remains uncharacterized.

Purpose of the Study:

  • To investigate the role of nuclear cGAS in regulating the two subpathways of NHEJ: canonical NHEJ (c-NHEJ) and alternative NHEJ (alt-NHEJ).
  • To elucidate the molecular mechanisms by which cGAS influences the balance between c-NHEJ and alt-NHEJ.

Main Methods:

  • Western blotting to assess protein levels and interactions.
  • Chromatin immunoprecipitation (ChIP) to analyze DNA binding.
  • Quantitative real-time PCR (qRT-PCR) to measure gene expression.
  • Cell-based assays to evaluate DNA repair pathway activity.

Main Results:

  • Nuclear cGAS promotes c-NHEJ by forming a complex with Ku80, enhancing the interaction between DNA-PKcs and USP7, which stabilizes DNA-PKcs.
  • Nuclear cGAS suppresses alt-NHEJ by directly binding to the Polθ promoter, thereby inhibiting its transcription.
  • cGAS shifts the balance of DSB repair towards the more accurate c-NHEJ pathway.

Conclusions:

  • Nuclear cGAS plays a crucial role in regulating DSB repair pathways by favoring c-NHEJ over alt-NHEJ.
  • The cGAS-Ku80 complex is central to modulating NHEJ subpathway choice through protein-protein interactions and transcriptional regulation.
  • These findings reveal a novel function for nuclear cGAS in maintaining genome integrity by influencing DNA repair mechanisms.