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Magnetic polymer models for epigenetics-driven chromosome folding.

Davide Colì1, Enzo Orlandini1, Davide Michieletto2

  • 1Dipartimento di Fisica and Sezione INFN, Università degli Studi di Padova, I-35131 Padova, Italy.

Physical Review. E
|December 25, 2019
PubMed
Summary
This summary is machine-generated.

Epigenetic modifications drive chromosome folding and gene expression changes. Our magnetic polymer model reveals a phase transition linked to epigenetic spreading and chromosome collapse, confirmed by simulations.

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Area of Science:

  • Biophysics
  • Genetics
  • Statistical Mechanics

Background:

  • Epigenetics influences crucial biological processes like cell differentiation and metamorphosis.
  • Understanding the biophysical mechanisms of epigenetic control over gene regulatory networks is an ongoing challenge.

Purpose of the Study:

  • To investigate the impact of epigenetic modifications on chromosome spatial folding and gene expression.
  • To model these effects using magnetic polymer analogies.

Main Methods:

  • Mapping epigenetic modifications to magnetic polymer models.
  • Analyzing phase transitions in the model.
  • Performing Brownian dynamics simulations incorporating polymer topology and thermal fluctuations.

Main Results:

  • A first-order phase transition is identified, correlating with epigenetic mark spreading and chromosome conformational collapse.
  • Simulations validate mean-field predictions and reveal new stable phases with nonequilibrium terms.
  • The model provides a framework for understanding in vivo observations.

Conclusions:

  • Statistical mechanics applied to magnetic polymer models can explain the interplay between epigenetic dynamics and chromatin organization.
  • This approach offers a powerful tool for interpreting experimental data on epigenetic regulation.