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Problems with parsimony in sequences of biased base composition
1Centre for the Study of Evolution & School of Biological Sciences, University of Sussex, Brighton BN1 9QG, UK. a.c.eyre-walker@sussex.ac.uk
Journal of Molecular Evolution
|December 16, 1998
Summary
Parsimony methods can be misleading for DNA sequence analysis, especially with skewed base composition. This study quantifies how parsimony incorrectly infers evolutionary changes, even at low divergence levels.
Area of Science:
- Evolutionary biology
- Molecular evolution
- Bioinformatics
Background:
- Parsimony is a widely used method for inferring evolutionary relationships and mutation direction.
- Known biases exist in parsimony methods when DNA sequences have skewed base compositions.
Purpose of the Study:
- To quantify the bias of parsimony methods in inferring substitution and mutation direction.
- To assess the impact of skewed base composition on parsimony inference accuracy.
Main Methods:
- Analysis of simple DNA sequence cases with varying base compositions.
- Quantification of substitution and mutation inference under parsimony.
Main Results:
- Parsimony methods show a bias when DNA base composition is skewed.
- Incorrect inference of common to rare changes is observed even at 10% sequence divergence.
Conclusions:
- Parsimony methods can be unreliable for inferring evolutionary history with skewed base composition.
- Caution is advised when applying parsimony to DNA sequences with uneven base frequencies.