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CTCF organizes inter-A compartment interactions through RYBP-dependent phase separation.

Chao Wei1,2,3, Lumeng Jia4, Xiaona Huang1,2,3

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RYBP-mediated phase separation of CTCF organizes long-range chromatin interactions, unlike canonical models. This discovery in embryonic stem cells (ESCs) impacts self-renewal and differentiation.

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Area of Science:

  • Chromatin biology
  • Epigenetics
  • Molecular cell biology

Background:

  • Chromatin exhibits 3D organization into compartments, domains, and loops.
  • The CTCF loop extrusion model explains loop formation but not A-A compartment interactions.
  • Mechanisms of long-range chromatin interaction remain unclear.

Purpose of the Study:

  • To elucidate the mechanisms organizing long-range chromatin interactions, particularly A-A compartments.
  • To investigate the role of CTCF and phase separation in chromatin organization.
  • To explore the functional consequences of altered CTCF-mediated interactions in embryonic stem cells.

Main Methods:

  • Investigated RYBP-mediated phase separation of CTCF.
  • Developed and validated an induced CTCF phase separation system in embryonic stem cells (ESCs).
  • Assessed effects on inter-A compartment interactions, ESC self-renewal, and neural differentiation.

Main Results:

  • RYBP-mediated CTCF phase separation organizes inter-A compartment interactions.
  • Induced CTCF phase separation facilitated these interactions in ESCs.
  • Enhanced inter-A compartment interactions improved ESC self-renewal and inhibited neural differentiation.

Conclusions:

  • CTCF plays a novel, non-canonical role in organizing long-range chromatin interactions via phase separation.
  • CTCF phase separation is a key mechanism for regulating chromatin 3D structure.
  • This mechanism impacts stem cell pluripotency and differentiation potential.