RT Journal Article
SR Electronic
T1 Two loci single particle trajectories analysis: constructing a first passage time statistics of local chromatin exploration
JF bioRxiv
FD Cold Spring Harbor Laboratory
SP 135012
DO 10.1101/135012
A1 O. Shukron
A1 MH. Hauer
A1 D. Holcman
YR 2017
UL http://biorxiv.org/content/early/2017/05/09/135012.abstract
AB Stochastic single particle trajectories are used to explore the local chromatin organization. We present here a statistical analysis of the first contact time distributions between two tagged loci recorded experimentally. First, we extract the association and dissociation times from data for various genomic distances between loci and we show that the looping time occurs in confined nanometer regions. Second, we characterize the looping time distribution for two loci in the presence of multiple DNA damages. Finally, we construct a polymer model that accounts for the local chromatin organization before and after a double-stranded DNA break (DSB) to estimate the level of chromatin decompaction. This novel passage time statistics method allows extracting transient dynamic at scales from one to few hundreds of nanometers, predicts the local changes in the number of binding molecules following DSB and can be used to better characterize the local dynamic of the chromatin.