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TADs: Dynamic structures to create stable regulatory functions.

José A da Costa-Nunes1, Daan Noordermeer1

  • 1Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), 91198, Gif-sur-Yvette, France.

Current Opinion in Structural Biology
|June 11, 2023
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Summary
This summary is machine-generated.

Mammalian chromosomes form Topologically Associating Domains (TADs) through dynamic loop extrusion. TAD boundaries block this process, influencing gene regulation and genome organization.

Keywords:
CTCFCohesinEnhancer-promoter loopingLoop extrusionTADs

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • Mammalian chromosomes exhibit hierarchical organization within the cell nucleus.
  • Topologically Associating Domains (TADs) are key structural units in 3D genome organization.
  • TADs play crucial roles in gene regulation, DNA replication, recombination, and repair.

Purpose of the Study:

  • To review the dynamic process of loop extrusion in forming TAD structures.
  • To discuss the role of TAD boundaries in genome organization and gene regulation.
  • To present recent evidence on the regulatory functions of TAD boundaries.

Main Methods:

  • Review of recent scientific literature on 3D genome organization.
  • Analysis of experimental data supporting the loop extrusion model.
  • Discussion of computational and imaging techniques used to study TADs.

Main Results:

  • TADs are increasingly viewed as dynamic collections of actively extruding loops, not static insulated domains.
  • Loop extrusion is a fundamental mechanism driving the formation of TAD structures.
  • TAD boundaries act as barriers, preventing loop extrusion and promoting intra-domain interactions.

Conclusions:

  • Mammalian TAD structure emerges from the dynamic process of loop extrusion.
  • TAD boundaries possess regulatory functions impacting gene expression and other genomic processes.
  • Understanding loop extrusion and TAD boundaries is crucial for comprehending genome regulation.