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R-loops, or RNA:DNA hybrids, are crucial for maintaining promoter architecture and balanced cell development. Their depletion impacts chromatin structure and accelerates ectodermal differentiation in mouse stem cells.

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Area of Science:

  • Epigenetics and genome regulation
  • Developmental biology
  • Molecular cell biology

Background:

  • R-loops (RNA:DNA hybrids) are increasingly recognized as critical regulators of genome function.
  • Their precise roles in chromatin architecture and developmental potential are not fully understood.

Purpose of the Study:

  • To investigate the impact of R-loop depletion on chromatin structure and lineage specification in mouse embryonic stem cells (mESCs).
  • To elucidate the function of R-loops in maintaining promoter architecture and developmental trajectories.

Main Methods:

  • Utilized inducible RNaseH1 expression in mESCs for transient, global R-loop depletion.
  • Analyzed changes in H2A.Z occupancy, nucleosome density, gene expression, and differentiation potential.
  • Examined gene regulatory networks during gastruloid differentiation.

Main Results:

  • R-loop depletion minimally affected steady-state gene expression and self-renewal.
  • Significant reduction in H2A.Z occupancy and increased nucleosome density at promoters were observed.
  • Accelerated ectodermal differentiation, dysregulated transcription factors, and impaired cell signaling occurred in R-loop-depleted mESCs.
  • Widespread perturbations in gene regulatory networks were identified across multiple early cell types.

Conclusions:

  • R-loops play a critical role in maintaining the H2A.Z chromatin landscape and promoter architecture.
  • R-loops are essential for preserving balanced lineage trajectories during early stem cell development.
  • These findings provide new insights into the epigenomic regulation of stem cell fate.