Entropy loss in long-distance DNA looping

TL;DR

This paper calculates the entropy loss in DNA looping using a scaling approach, providing quick estimates that suggest entropy plays a significant role in genetic switch mechanisms.

Contribution

It introduces an analytical method to estimate entropy loss in long DNA loops, highlighting its importance in genetic regulation.

Findings

Entropy loss can be significant in DNA loop formation.

Analytical results enable rapid entropy estimation.

Entropy may influence the energy balance in genetic switches.

Abstract

The entropy loss due to the formation of one or multiple loops in circular and linear DNA chains is calculated from a scaling approach in the limit of long chain segments. The analytical results allow to obtain a fast estimate for the entropy loss for a given configuration. Numerical values obtained for some examples suggest that the entropy loss encountered in loop closure in typical genetic switches may become a relevant factor which has to be overcome by the released bond energy between the looping contact sites.