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Weak interactions in higher-order chromatin organization.

Omar L Kantidze1, Sergey V Razin1

  • 1Institute of Gene Biology Russian Academy of Sciences, 119334 Moscow, Russia.

Nucleic Acids Research
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Weak biological forces, including entropic forces and liquid-liquid phase separation, are crucial for establishing and maintaining the three-dimensional (3D) genome organization in eukaryotes. These forces drive chromosome segregation and intranuclear compartmentalization.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Biophysics

Background:

  • The hierarchical folding of eukaryotic chromosomes and their three-dimensional (3D) genome organization, including chromatin compartments and topologically associating domains, have been extensively studied.
  • Molecular mechanisms underlying the establishment and maintenance of 3D genome structures are increasingly understood, with protein-protein and protein-DNA interactions being key.
  • Emerging evidence highlights the significant, yet often overlooked, role of weak interactions in shaping spatial genome organization.

Purpose of the Study:

  • To provide a current overview of the role of weak interactions in the establishment and maintenance of 3D genome organization.
  • To discuss the contribution of various weak biological forces to the structural and functional compartmentalization within the nucleus.

Main Methods:

  • Review and synthesis of existing research on weak interactions in 3D genome organization.
  • Discussion of specific weak forces, including entropic forces, electrostatic interactions, liquid-liquid phase separation, DNA supercoiling, and the RNA environment.

Main Results:

  • Weak interactions, previously underestimated, play a critical role in the spatial organization of the eukaryotic genome.
  • Forces such as entropic effects in crowded cellular environments, electrostatic interactions, liquid-liquid phase separation, DNA supercoiling, and the influence of RNA contribute to chromosome structural organization.
  • These weak forces are integral to the segregation of chromosomes into functional units and drive intranuclear compartmentalization.

Conclusions:

  • Weak biological forces are fundamental to achieving the complex three-dimensional architecture of the eukaryotic genome.
  • Understanding these forces is essential for a comprehensive view of genome regulation, chromosome dynamics, and nuclear function.
  • Further research into these weak interactions will likely uncover new mechanisms of genome organization and disease association.