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ZFP281-BRCA2 prevents R-loop accumulation during DNA replication.

Yan Wang1, Binbin Ma2, Xiaoxu Liu1

  • 1Jiangsu Provincial Key Laboratory of Critical Care Medicine, Key Laboratory of Developmental Genes and Human Disease, School of Life Science and Technology, Southeast University, Nanjing, 210096, China.

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ZFP281 and BRCA2 prevent R-loop accumulation during DNA replication in stem cells. This interaction ensures proper gene activation and genome stability by recruiting BRCA2 to bivalent chromatin.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cell Biology

Background:

  • R-loops are common in mammalian genomes and play roles in cellular processes.
  • BRCA2 depletion causes R-loop accumulation and genome instability.

Purpose of the Study:

  • To investigate the role of ZFP281 in preventing R-loop accumulation with BRCA2.
  • To understand the mechanism of ZFP281-BRCA2 cooperation in DNA replication and gene regulation.

Main Methods:

  • Studied ZFP281 and BRCA2 interaction in embryonic stem cells.
  • Assessed R-loop accumulation, PCNA levels, and DNA replication upon ZFP281 or BRCA2 depletion.
  • Analyzed BRCA2 recruitment to bivalent chromatin using genome-wide approaches.

Main Results:

  • ZFP281 cooperates with BRCA2 to prevent R-loop accumulation, facilitating DNA replication.
  • ZFP281 depletion reduces chromatin-bound PCNA and impairs DNA replication.
  • BRCA2 recruitment to bivalent chromatin requires ZFP281 and PRC2.
  • Depletion of ZFP281 or BRCA2 leads to R-loop accumulation in bivalent regions and compromises developmental gene activation.

Conclusions:

  • ZFP281 recruits BRCA2 to bivalent chromatin regions.
  • This interaction is crucial for preventing R-loops and ensuring DNA replication progression.
  • The ZFP281-BRCA2 pathway is vital for stem cell differentiation and genome integrity.