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How subtle changes in 3D structure can create large changes in transcription.

Jordan Yupeng Xiao1, Antonina Hafner2, Alistair N Boettiger1,2

  • 1Program in Biophysics, Stanford University, Stanford, United States.

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|July 9, 2021
PubMed
Summary
This summary is machine-generated.

A new futile cycle model explains how enhancer-promoter interactions within topologically associated domains (TADs) can lead to large gene expression changes, despite weak TAD boundaries. This model addresses hypersensitive gene regulation and reconciles experimental findings.

Keywords:
3D genomeD. melanogasterTADchromosomescomputational biologygene expressionhumanmousestochastic modelingsystems biologytranscription

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Area of Science:

  • Genomics and Gene Regulation
  • Computational Biology

Background:

  • Animal genomes feature topologically associated domains (TADs) crucial for gene regulation.
  • TADs are believed to mediate enhancer-promoter (E-P) contacts within domains while restricting them across boundaries.
  • Existing models fail to explain the observed large gene expression changes (up to 10-fold) from minor TAD boundary disruptions (less than 2-fold contact frequency change).

Purpose of the Study:

  • To propose a novel model explaining the hypersensitive gene regulation observed in relation to TADs.
  • To investigate the mechanism behind the apparent discrepancy between contact frequency changes and gene expression alterations.
  • To reconcile conflicting experimental results regarding the role of TAD boundaries in gene regulation.

Main Methods:

  • Development of a futile cycle model for enhancer-mediated gene regulation.
  • Mathematical analysis of the proposed model to understand its regulatory properties.
  • Stochastic simulations to explore system dynamics, bistability, and hysteresis.

Main Results:

  • The futile cycle model demonstrates hypersensitivity in gene regulation through bistability and hysteresis.
  • The model shows that enhancer-promoter contact does not need a strong correlation with promoter activity for regulation to occur.
  • It explains the significance of weak TAD boundaries and reconciles diverse experimental observations on TAD disruption.

Conclusions:

  • The futile cycle model provides a mechanism for hypersensitive gene regulation mediated by enhancer-promoter contacts within TADs.
  • This model accounts for the observed disconnect between contact frequency and gene expression changes, suggesting an 'illusion' of specificity.
  • The findings advance the understanding of cis-regulatory elements and TADs in controlling gene expression, guiding future research.