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TAD boundaries and gene activity are uncoupled.

Faisal Almansour1, Nadezda A Fursova2, Adib Keikhosravi3

  • 1National Cancer Institute, NIH, Bethesda, United States.

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|April 15, 2026
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Summary
This summary is machine-generated.

Topologically associating domains (TADs) are key genome structures. This study reveals that TAD boundaries do not directly influence gene activity, suggesting genome architecture and gene regulation are largely independent.

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chromatinchromosomesgene expressiongenome organizationhumantranscription

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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • Topologically associating domains (TADs) are fundamental units of genome organization.
  • TADs are hypothesized to regulate gene expression by mediating intra-domain interactions and preventing inter-domain interactions.

Purpose of the Study:

  • To investigate the functional relationship between TAD boundaries and gene activity.
  • To assess the impact of TAD boundary interactions on transcriptional regulation at the single-cell and single-allele level.

Main Methods:

  • High-throughput imaging was employed to simultaneously analyze TAD boundary behavior and gene activity.
  • Experiments involved assessing TAD boundary proximity, transcriptional inhibition/activation, and the roles of RAD21 and CTCF.

Main Results:

  • TAD boundary pairing occurs but is infrequent and uncorrelated with gene transcriptional activity.
  • Global or gene-specific transcriptional changes did not affect TAD boundary proximity.
  • Disruption of TAD boundaries via CTCF depletion did not alter gene expression within TADs, although RAD21 loss affected gene activity.

Conclusions:

  • TAD boundary architecture and gene activity appear to be largely uncoupled.
  • The proposed model of TADs solely regulating gene expression through boundary interactions may require revision.