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Studying DNA Looping by Single-Molecule FRET
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Theory of chromosome structural dynamics by processive loop extrusion.

Zhiyu Cao1, Chaoqun Du2, Zhonghuai Hou2

  • 1Center for Theoretical Biological Physics, Rice University, Houston, TX 77005.

Proceedings of the National Academy of Sciences of the United States of America
|May 28, 2026
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Summary

Structural Maintenance of Chromosome complexes drive loop extrusion, influencing chromosome architecture. Their processivity dictates whether chromosomes form crystalline or liquid-crystalline structures during cell division.

Keywords:
active matterloop extrusionmotor proteinspolymer physics

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Area of Science:

  • Chromatin dynamics and chromosome organization.
  • Statistical mechanics of biological systems.
  • Molecular motor function in genome architecture.

Background:

  • Structural Maintenance of Chromosome (SMC) complexes are crucial for chromosome organization.
  • Loop extrusion by SMC complexes establishes large-scale chromosome architecture.
  • Understanding the role of motor processivity in these events is key.

Purpose of the Study:

  • To develop a mechanistic model for loop extrusion incorporating motor processivity.
  • To investigate the statistical mechanical effects of processive motor activity.
  • To link processivity to large-scale chromosome structure, including interphase and mitotic organization.

Main Methods:

  • Developed an active, non-Markovian mechanistic model.
  • Incorporated motor processivity explicitly into a statistical mechanical framework.
  • Analyzed the model's predictions for chromatin organization at different activity levels.

Main Results:

  • Processive loop extrusion generates "chromatin jets" at low activity (interphase).
  • Increased activity leads to symmetry breaking and cylindrically anisotropic mitotic chromosome organization.
  • Motor processivity strength determines the transition to crystalline or liquid-crystalline states.

Conclusions:

  • Motor processivity is a critical factor in determining chromosome architecture.
  • The model explains the emergence of distinct organizational states (interphase vs. mitotic) based on activity and processivity.
  • This work provides a framework for understanding how molecular motor properties translate to emergent biological structures.