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Outgroup misplacement and phylogenetic inaccuracy under a molecular clock--a simulation study.

B R Holland¹, D Penny, M D Hendy

¹Allan Wilson Centre for Molecular Ecology and Evolution, Massey University, Palmerston North, New Zealand. b.r.holland@massey.ac.nz

Systematic Biology

|May 15, 2003

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Maximum likelihood phylogenetic inference with a molecular clock assumption performed best for a five-taxon tree. Parsimony and neighbor-joining methods showed improvements with corrections, but data correction generally reduced accuracy.

Area of Science:

Phylogenetics
Computational Biology
Molecular Evolution

Background:

Phylogenetic methods are crucial for reconstructing evolutionary relationships.
Evaluating the performance of different phylogenetic inference methods under specific conditions is essential.
Molecular clock assumptions can influence tree reconstruction accuracy.

Purpose of the Study:

To compare the accuracy of four phylogenetic methods: UPGMA, neighbor joining, maximum parsimony, and maximum likelihood.
To assess the impact of inconsistency and distance corrections on phylogenetic accuracy.
To investigate the performance of these methods under a molecular clock assumption and identify potential pitfalls.

Main Methods:

Simulation study of a five-taxon tree.

Related Experiment Videos

Implementation of Unweighted Pair Group Method with Arithmetic Mean (UPGMA), neighbor joining, maximum parsimony, and maximum likelihood.

Testing of inconsistency correction for parsimony and distance correction for neighbor joining.

Analysis across a parameter space including regions of parsimony inconsistency.

Main Results:

Maximum likelihood with a molecular clock assumption outperformed other tested methods.
Corrected parsimony became consistent, but distance correction for neighbor joining showed mixed results.
Data correction generally decreased accuracy, particularly with short sequences.
Incorrect outgroup placement led to frequent selection of erroneous trees, even when methods were consistent.

Conclusions:

Maximum likelihood with a molecular clock is a robust method for the simulated five-taxon tree scenario.
Care must be taken with data corrections, as they can be detrimental to accuracy.
Outgroup placement significantly impacts phylogenetic inference accuracy, potentially confounding ingroup relationships.