May 18, 2016

Large scale chromosome folding is stable against local changes in chromatin structure

BioRxiv : the Preprint Server for Biology
Ana Maria FlorescuAngelo Rosa

Abstract

Characterizing the link between small-scale chromatin structure and large-scale chromosome folding during interphase is a prerequisite for understanding transcription. Yet, this link remains poorly investigated. Here, we introduce a simple biophysical model where interphase chromosomes are described in terms of the folding of chromatin sequences composed of alternating blocks of fibers with different thicknesses and flexibilities, and we use it to study the influence of sequence disorder on chromosome behaviors in space and time. By employing extensive computer simulations,we thus demonstrate that chromosomes undergo noticeable conformational changes only on length-scales smaller than 105 basepairs and time-scales shorter than a few seconds, and we suggest there might exist effective upper bounds to the detection of chromosome reorganization in eukaryotes. We prove the relevance of our framework by modeling recent experimental FISH data on murine chromosomes.

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Mentioned in this Paper

Fluorescent in Situ Hybridization
Interphase
Murine
SPT6 Protein
Anatomical Space Structure
Biophysics
Chromosomes
Fiber
Structure
Chromatin Location

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