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BRCA1 binds TERRA RNA and suppresses R-Loop-based telomeric DNA damage.

Jekaterina Vohhodina1,2, Liana J Goehring3, Ben Liu3,4

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BRCA1 protein binds TERRA RNA and telomere proteins, regulating R-loop structures to prevent genomic instability. Loss of BRCA1 function leads to telomere abnormalities and DNA damage.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • R-loop structures are crucial for cellular processes but can induce genomic instability, especially at telomeres.
  • Telomeres are susceptible to DNA secondary structures, and R-loops contribute to telomeric fragility.

Purpose of the Study:

  • To investigate the role of BRCA1 in regulating R-loop structures at telomeres.
  • To elucidate the mechanism by which BRCA1 interacts with TERRA RNA and telomere proteins.

Main Methods:

  • Biochemical assays to confirm direct binding of BRCA1 to TERRA RNA and shelterin proteins.
  • Cellular experiments to assess the impact of BRCA1 depletion and mutations on R-loop formation and telomere integrity.
  • Analysis of R-loop-associated DNA damage and repair pathways.

Main Results:

  • BRCA1 directly binds TERRA RNA via its N-terminal nuclear localization sequence and telomere-specific shelterin proteins.
  • BRCA1 binding to TERRA promoters represses transcription, prevents R-loop associated damage, and promotes repair.
  • BRCA1 depletion or mutations lead to increased TERRA R-loops, telomeric replication stress, and abnormalities.

Conclusions:

  • BRCA1 plays a critical role in suppressing telomere-centered genome instability by regulating TERRA R-loops.
  • Normal BRCA1-TERRA interaction is essential for maintaining telomere integrity and preventing DNA damage.
  • Dysfunctional BRCA1 contributes to telomeric abnormalities through aberrant R-loop formation.