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CRISPR-Mediated Reorganization of Chromatin Loop Structure

CRISPR-Mediated Reorganization of Chromatin Loop Structure

Published on: September 14, 2018

Heterogeneous Loop Model to Infer 3D Chromosome Structures from Hi-C.

Lei Liu¹, Min Hyeok Kim¹, Changbong Hyeon¹

¹School of Computational Sciences, Korea Institute for Advanced Study, Seoul, Republic of Korea.

Biophysical Journal

|July 25, 2019

Summary

We developed a minimalist Heterogeneous Loop Model (HLM) to infer 3D chromatin folding from Hi-C data. This model visualizes chromosome structures, aiding interpretation of various experimental data and revealing insights into gene regulation and cell-cycle dynamics.

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Area of Science:

Genomics and Molecular Biology
Computational Biology
Polymer Physics

Background:

Understanding the three-dimensional (3D) folding of chromatin is crucial for deciphering gene regulation and cellular function.
Existing methods for inferring 3D chromosome structures from Hi-C data can be computationally intensive and require extensive parameterization.

Purpose of the Study:

To develop a computationally efficient and versatile modeling tool for inferring 3D chromatin structures from Hi-C contact maps.
To visualize and interpret chromosome organization, gene expression, and regulatory interactions.

Main Methods:

Adapted a polymer physics formalism to create a minimalist Heterogeneous Loop Model (HLM).
Generated 3D chromosome structures using Hi-C contact frequency data.
Applied HLM to analyze topologically associated domains, gene loci interactions, and cell-cycle-dependent chromatin conformation.

Main Results:

HLM successfully generated 3D chromosome structures that reproduce spatial distributions of topologically associated domains and show phase segregation.
Modeled chromatin globules of specific gene loci (α-globin, SOX2, Pax6) to explain cell-type-dependent gene expression and enhancer interactions.
Visualized dynamic changes in chromosome 19 conformation during the cell cycle in mouse embryonic stem cells.

Conclusions:

The Heterogeneous Loop Model (HLM) is an efficient and versatile tool for generating 3D chromosome structures from Hi-C data.
HLM-generated structures complement other experimental data, providing insights into chromatin organization, gene regulation, and dynamic cellular processes.
The model facilitates the interpretation of complex genomic data and aids in understanding the functional implications of chromatin folding.