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Information exchange is a critical process in all communication systems,including biological ones. The concept of retroactivity represents the loadsthat downstream modules apply to their upstream systems in biological circuits.This paper focuses on studying the impact of retroactivity on differentbiological signaling system models, which present analogies with well-knowntelecommunication systems. The mathematical analysis is performed both in thehigh and low molecular counts regime, by mean of the Chemical Master Equationand the Linear Noise Approximation, respectively. The aim is to provideanalytical tools to maximize the reliable information exchange for differentbiomolecular circuit models. Results highlight how, in general, retroactivityharms communication performance. This negative effect can be mitigated byadding to the signaling circuit an independent upstream system that connectswith the same pool of downstream systems.

What Is the Trait d'Union between Retroactivity and Molecular Communication Performance Limits?