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Ages of mutations on a coalescent tree
1Mathematics Department, Monash University, Clayton, Vic., Australia. rjt@mws4.biol.berkeley.edu
Mathematical Biosciences
|November 12, 1998
Summary
This study introduces a new method to determine mutation ages using DNA sequence data and the coalescent process. This aids in examining population stability over time, illustrated with Amerindian genetic data.
Area of Science:
- Population Genetics
- Phylogenetics
- Molecular Evolution
Background:
- The coalescent process models the phylogenetic history of DNA sequences within a population.
- The number of segregating sites in DNA sequences, under the infinitely-many-sites model, quantifies mutations on a phylogenetic tree.
Purpose of the Study:
- To introduce a novel method for estimating the ages of individual mutations within a phylogenetic tree.
- To assess the utility of this method in evaluating population size stability over evolutionary time.
Main Methods:
- Utilizing the coalescent process and DNA sequence data.
- Applying a recursive method to estimate mutation ages based on the total number of mutations.
- Analyzing DNA sequence data from a sample of Amerindians (Nuu-Chah-Nulth tribe) to illustrate the method's application.
Main Results:
- A method was developed to determine the ages of mutations from the total number of mutations on a coalescent tree.
- The method is not suitable for dating specific segregating sites but is valuable for assessing population constancy.
- Application to Amerindian DNA data provided insights into population history.
Conclusions:
- The developed method offers a new approach to inferring mutation timings within a population's evolutionary history.
- This technique is particularly useful for testing assumptions of constant population size in phylogenetic studies.
- The study demonstrates the practical application of this method using real-world genetic data.