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Neutral aggregation in finite-length genotype space
1CNRS, LIPHY, F-38000 Grenoble, France and Université Grenoble Alpes, LIPHY, F-38000 Grenoble, France.
Physical Review. E
|February 18, 2017
Summary
Modern sequencing tests Darwinian evolution
Area of Science:
- Evolutionary biology
- Population genetics
- Genomics
Background:
- The neutrality hypothesis posits equal fitness for all individuals in Darwinian evolution.
- Modern genome sequencing offers advanced tools to evaluate evolutionary hypotheses.
- Understanding genetic variation patterns is key to evolutionary studies.
Purpose of the Study:
- To computationally model and quantify neutral aggregation in genome space.
- To assess the impact of population size and mutation rate on genetic distances.
- To extend the model to geographically structured populations and test evolutionary hypotheses.
Main Methods:
- Utilizing the individual-based model developed by Wright and Fisher.
- Calculating the probability of genetic (Hamming) distance k between individuals.
- Analyzing the effects of genome size (L), population size (N), and mutation probability (ν).
Main Results:
- Neutral aggregation dominates in well-mixed populations when Nν < 1/L, leading to short genetic distances.
- Random dispersal in genome space occurs when Nν > 1.
- A combination of mutation and migration probabilities governs aggregation in dispersed populations.
Conclusions:
- The developed theory provides a framework for testing the neutrality hypothesis.
- Results offer insights into genetic structure influenced by evolutionary forces.
- The model is applicable to diverse ecological and evolutionary systems.
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