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Related Experiment Video

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Adaptation at the Extremes of Life: Experimental Evolution with the Extremophile Archaeon Sulfolobus acidocaldarius

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Published on: June 14, 2024

Biophysical connection between evolutionary dynamics and thermodynamics in in vitro evolution.

Takuyo Aita¹, Yuzuru Husimi

¹Graduate School of Science and Engineering, Saitama University, Saitama 338-8570, Japan. taita@mail.saitama-u.ac.jp

Journal of Theoretical Biology

|November 17, 2011

Summary

This study reveals a thermodynamic framework for in vitro evolution, linking evolutionary temperature to thermodynamic temperature. This connection allows predicting fitness in evolutionary experiments using thermodynamic principles.

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Area of Science:

Biophysics
Evolutionary Biology
Chemical Thermodynamics

Background:

In vitro evolution involves cycles of mutagenesis and selection.
Fitness is often related to molecular properties like Gibbs free energy.
Understanding evolutionary dynamics can benefit from thermodynamic analogies.

Purpose of the Study:

To analyze a mathematical model of in vitro evolution.
To establish a biophysical connection between evolutionary dynamics and thermodynamics.
To explore the predictive power of thermodynamic parameters in evolution.

Main Methods:

Mathematical modeling of mutagenesis and selection processes.
Analysis of fitness amplification using Boltzmann factors.
Derivation of relationships between evolutionary and thermodynamic parameters.

Main Results:

Evolutionary dynamics can be described using an "evolution constant" (k(E)) and "evolutionary temperature" (T(evo)).
Fitness in the stationary state is inversely proportional to k(E)T(evo).
A direct biophysical link was found: k(E)T(evo) ≈ k(B)T(the)/2r, connecting evolutionary and thermodynamic temperatures.

Conclusions:

The study establishes a thermodynamic framework for in vitro evolution.
Evolutionary and thermodynamic temperatures are quantitatively linked.
Thermodynamic temperature can predict stationary-state fitness in evolutionary experiments.