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Related Experiment Video

Updated: Aug 16, 2025

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R-loop-derived cytoplasmic RNA-DNA hybrids activate an immune response.

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|December 21, 2022
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This summary is machine-generated.

R-loops, RNA-DNA hybrids, can trigger innate immune responses when misprocessed and accumulate in the cytoplasm. This aberrant accumulation leads to cell death, potentially contributing to diseases like cancer and neurodegeneration.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Immunology

Background:

  • R-loops are crucial nucleic acid structures involved in cellular processes.
  • Dysregulation of R-loop dynamics is linked to DNA damage and genome instability.
  • The role of endonucleases like XPG in R-loop processing and its consequences were unclear.

Purpose of the Study:

  • To identify and characterize a novel population of cytoplasmic RNA-DNA hybrids.
  • To elucidate the mechanisms of R-loop processing and the formation of cytoplasmic hybrids.
  • To investigate the cellular consequences of aberrant R-loop processing, including immune activation and cell death.

Main Methods:

  • Perturbation of nuclear R-loops by depleting senataxin (SETX) or BRCA1.
  • Identification of cytoplasmic RNA-DNA hybrids.
  • Assessing the binding of hybrids to pattern recognition receptors (cGAS, TLR3).
  • Monitoring IRF3 activation and apoptosis induction.
  • Analysis of patient-derived cells with SETX or BRCA1 mutations.

Main Results:

  • A new population of cytoplasmic RNA-DNA hybrids was identified as R-loop processing products.
  • Cytoplasmic hybrid formation was dependent on XPG and XPF.
  • These hybrids originate from specific nuclear R-loops.
  • Cytoplasmic hybrids activate the innate immune response via cGAS and TLR3, leading to IRF3 activation and apoptosis.
  • R-loop processing and immune activation were observed in cells from patients with ataxia and in BRCA1-mutated cancer cells.

Conclusions:

  • RNA-DNA hybrids can be immunogenic when aberrantly processed and accumulated in the cytoplasm.
  • R-loop processing contributes to cell death through innate immune activation.
  • Aberrant R-loop processing and immune activation may play a role in neurodegeneration and cancer.