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A Simple Stimulatory Device for Evoking Point-like Tactile Stimuli: A Searchlight for LFP to Spike Transitions

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Nonlinearity, fluctuations, and response in sensory systems.

Antonio Celani¹, Massimo Vergassola

¹Institut Pasteur, 28 rue du Docteur Roux, 75015 Paris, France and CNRS, UMR 3525, Institut Pasteur.

Physical Review Letters

|September 26, 2012

Summary

Biological sensing pathways, like bacterial chemotaxis, exhibit complex responses to environmental stimuli due to fluctuations. Nonlinearity and fluctuations jointly shape these responses, offering insights into biological signaling mechanisms.

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Area of Science:

Biophysics
Systems Biology
Microbiology

Background:

Biological sensing pathways are crucial for cellular responses to environmental changes.
Bacterial chemotaxis serves as a well-established model system for studying cellular sensing.
Understanding the role of fluctuations in biological responses is key to deciphering cellular behavior.

Purpose of the Study:

To investigate the statistical properties of fluctuations in biological sensing pathways.
To establish a quantitative relationship between steady-state fluctuations and system response to stimuli.
To explain the complex, nonlinear responses observed in biological sensing.

Main Methods:

Analytical derivation of steady-state probability distribution and correlation times for allosteric receptor models.
Application of fluctuation relations to link correlations with system response.
Modeling of bacterial chemotaxis signaling pathways.

Main Results:

Fluctuations and nonlinearity together create complex, nonlinear responses at both single-unit and whole-cell levels.
Responses exhibit nonexponential decay across a wide range of timescales.
A systematic explanation is provided for the link between fluctuation and response observed in experiments.

Conclusions:

The study elucidates how intrinsic fluctuations and nonlinearities govern biological sensing.
The findings offer a framework for understanding diverse cellular responses to environmental cues.
This work bridges theoretical modeling with experimental observations in bacterial chemotaxis.