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Related Experiment Video

Updated: Mar 21, 2026

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Following the Dynamics of Structural Variants in Experimentally Evolved Populations

Published on: February 3, 2023

The mutation-drift balance in spatially structured populations.

David M Schneider¹, Ayana B Martins¹, Marcus A M de Aguiar¹

¹Instituto de Física 'Gleb Wataghin', Universidade Estadual de Campinas, Unicamp 13083-970, Campinas, SP, Brazil.

Journal of Theoretical Biology

|May 2, 2016

Summary

Spatial structure impacts neutral mutation dynamics in finite populations. Low connectivity networks decrease the mutation threshold, promoting genetic diversity at lower mutation rates.

Keywords:

Allele distribution Moran model Mutation threshold Networks

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Area of Science:

Population Genetics
Theoretical Biology
Mathematical Biology

Background:

Neutral mutations and genetic drift balance in finite populations, determining allele distributions.
Well-mixed populations exhibit a mutation threshold (μc=1/2N) separating distinct equilibrium behaviors.
The influence of spatial structure on this threshold remains largely unexplored.

Purpose of the Study:

To investigate how spatial structure affects the mutation threshold in finite populations.
To analyze the stationary allele distribution on regular networks representing mating interactions.

Main Methods:

Utilized the Moran model to simulate population dynamics with neutral mutations.
Mapped the Moran model with mutations to the voter model with opinion makers.
Analyzed populations structured on regular networks where nodes represent potential mates.

Main Results:

Spatial structure significantly alters the mutation threshold only in populations with very few potential mates (low connectivity).
In such low-connectivity networks, the mutation threshold decreases substantially, enhancing genetic diversity at lower mutation rates.
The critical network degree (kc) for halving the mutation threshold grows slowly with population size, following a power law.

Conclusions:

Spatial structure, particularly low connectivity, can maintain genetic diversity by lowering the mutation threshold.
This finding highlights the importance of considering network topology in evolutionary dynamics.
The study provides a theoretical framework and simulation-based evidence for spatially structured population genetics.