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Updated: Jun 14, 2025

Real-time Observation of the DNA Strand Exchange Reaction Mediated by Rad51
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Hyper-recombination in ribosomal DNA is driven by long-range resection-independent RAD51 accumulation.

Zita Gál1,2, Stavroula Boukoura1, Kezia Catharina Oxe1

  • 1Nucleolar Stress and Disease Group, Danish Cancer Institute, 2100, Copenhagen, Denmark.

Nature Communications
|September 6, 2024
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Summary
This summary is machine-generated.

Bloom helicase (BLM) deficiency causes ribosomal DNA (rDNA) instability by allowing RAD51 accumulation, leading to micronuclei and potential genomic instability. This study investigates rDNA repair mechanisms in Bloom syndrome.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Genomic Instability

Background:

  • Ribosomal DNA (rDNA) is an intrinsically unstable genomic region.
  • Mechanisms driving rDNA instability and its impact on genome integrity are not fully understood.
  • Bloom syndrome (BS) is a genetic disorder featuring DNA repair defects and heightened rDNA instability.

Purpose of the Study:

  • To investigate the mechanisms underlying rDNA instability using Bloom syndrome as a model.
  • To elucidate the role of Bloom helicase (BLM) in maintaining rDNA stability and genome integrity.

Main Methods:

  • Comparative analysis of homologous recombination (HR) pathways in Bloom helicase (BLM)-proficient and deficient cells.
  • Assessment of DNA repair protein recruitment (RPA, BRCA1/2, RAD51) to rDNA.
  • Investigation of rDNA damage consequences, including micronucleation, in BLM-deficient cells.

Main Results:

  • In BLM-proficient cells, rDNA HR follows established chromatin pathways involving resection, RPA, and BRCA2-RAD51.
  • BLM deficiency impairs RPA loading and BRCA1/2 recruitment to rDNA but permits RAD51 accumulation.
  • RAD51 accumulates at rDNA even without long-range resection nucleases, and BLM absence leads to rDNA-induced micronuclei.

Conclusions:

  • Ribosomal DNA is permissive to RAD51 accumulation in the absence of Bloom helicase (BLM).
  • BLM deficiency-induced RAD51 accumulation at rDNA contributes to micronucleation.
  • This process may represent a significant mechanism driving global genomic instability in Bloom syndrome.