Competition between condensation of monovalent and multivalent ions in DNA aggregation

TL;DR

This paper investigates how monovalent and multivalent ions compete to condense around DNA, highlighting the influence of short-range interactions, salt conditions, and modeling choices on ion distribution and DNA aggregation.

Contribution

It provides a detailed analysis of ion competition effects on DNA condensation, emphasizing the sensitivity to various physical and model parameters.

Findings

Ion distribution around DNA is highly sensitive to short-range interactions.

Multivalent ions significantly influence DNA aggregation behavior.

Model-dependent factors affect predictions of ion condensation.

Abstract

We discuss the distribution of ions around highly charged PEs when there is competition between monovalent and multivalent ions, pointing out that in this case the number of condensed ions is sensitive to short-range interactions, salt, and model-dependent approximations. This sensitivity is discussed in the context of recent experiments on DNA aggregation, induced by multivalent counterions such as spermine and spermidine.