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Randomly cross-linked polymer models

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arxiv 1705.04041 v1 pith:XPUYGUZD submitted 2017-05-11 cond-mat.soft physics.bio-ph

Randomly cross-linked polymer models

classification cond-mat.soft physics.bio-ph
keywords chromatinpolymerrandomlycross-linkedencountermodelsresultsused
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Polymer models are used to describe chromatin, which can be folded at different spatial scales by binding molecules. By folding, chromatin generates loops of various sizes. We present here a randomly cross-linked (RCL) polymer model, where monomer pairs are connected randomly. We obtain asymptotic formulas for the steady-state variance, encounter probability, the radius of gyration, instantaneous displacement and the mean first encounter time between any two monomers. The analytical results are confirmed by Brownian simulations. Finally, the present results can be used to extract the minimum number of cross-links in a chromatin region from {conformation capture} data.

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