A polymer model explains the complexity of large-scale chromatin folding

Item Type:	Article
Title:	A polymer model explains the complexity of large-scale chromatin folding
Creators Name:	Barbieri, M. and Fraser, J. and Lavitas, L.M. and Chotalia, M. and Dostie, J. and Pombo, A. and Nicodemi, M.
Abstract:	The underlying global organization of chromatin within the cell nucleus has been the focus of intense recent research. Hi-C methods have allowed for the detection of genome-wide chromatin interactions, revealing a complex large-scale organization where chromosomes tend to partition into megabase-sized "topological domains" of local chromatin interactions and intra-chromosomal contacts extends over much longer scales, in a cell-type and chromosome specific manner. Until recently, the distinct chromatin folding properties observed experimentally have been difficult to explain in a single conceptual framework. We reported that a simple polymer-physics model of chromatin, the Strings and Binders Switch (SBS) model, succeeds in describing the full range of chromatin configurations observed in vivo. The SBS model simulates the interactions between randomly diffusing binding molecules and binding sites on a polymer chain. It explains how polymer architectural patterns can be established, how different stable conformations can be produced and how conformational changes can be reliably regulated by simple strategies, such as protein upregulation or epigenetic modifications, via fundamental thermodynamics mechanisms.
Keywords:	Chromatin Organization, Polymer Physics, Statistical Mechanics, Hi-C
Source:	Nucleus
ISSN:	1949-1042
Publisher:	Landes Bioscience
Volume:	4
Number:	4
Page Range:	267-273
Date:	19 June 2013
Additional Information:	Extra View to: PNAS 109(40):16173-16178.
Official Publication:	https://doi.org/10.4161/nucl.25432
PubMed:	View item in PubMed

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