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Topologically Associating Domains: An invariant framework or a dynamic scaffold?

Caelin Cubeñas-Potts1, Victor G Corces1

  • 1a Department of Biology ; Emory University ; Atlanta , GA USA.

Nucleus (Austin, Tex.)
|September 30, 2015
PubMed
Summary

Heat shock alters topologically associating domains (TADs) by changing gene transcription and architectural proteins. Architectural proteins play a key role in TAD dynamics, influencing gene expression during cellular differentiation.

Keywords:
3D architectureCTCFTADarchitectural proteinschromatindifferentiationepigeneticsheat shockinsulators

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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • Metazoan genomes are organized into topologically associating domains (TADs).
  • TADs are crucial for genome organization and gene regulation.
  • TADs are defined by border elements with high occupancy of architectural proteins and active genes.

Purpose of the Study:

  • To investigate the dynamic changes in 3D chromatin architecture, specifically TADs, in response to physiological stress (heat shock).
  • To determine the contributions of transcriptional changes and architectural protein redistribution to heat shock-induced TAD dynamics.
  • To explore the implications of these findings on TAD dynamics during cellular differentiation.

Main Methods:

  • Quantitative measurement of TAD border strength under various conditions.
  • Analysis of chromatin architecture following heat shock.
  • Assessment of TAD dynamics after transcriptional inhibition and architectural protein knockdown.

Main Results:

  • Heat shock induces global redistribution of architectural proteins and alters TAD structure.
  • Both transcriptional changes and architectural protein occupancy contribute to heat shock-induced TAD dynamics.
  • Architectural proteins play a more significant role in modulating 3D chromatin architecture during stress response.

Conclusions:

  • Cellular stress, like heat shock, dynamically alters genome organization at the TAD level.
  • Architectural proteins are key regulators of TAD dynamics and 3D chromatin structure.
  • Variable TADs observed during differentiation may reflect cell-type-specific gene expression and biological significance.