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Animal phylogeny: fatal attraction.
Maximilian J Telford1, Richard R Copley
1Department of Biology, University College London, Darwin Building, UK.
Current Biology : CB
|April 28, 2005
Summary
Phylogenetic analyses using hundreds of genes suggest flies are closer to vertebrates than nematodes. However, this finding may be an artifact of long branch attraction in evolutionary studies.
Area of Science:
- Evolutionary biology
- Comparative genomics
- Animal phylogeny
Background:
- Phylogenetic analyses of numerous genes from model organisms have historically placed flies closer to vertebrates than nematodes.
- This placement has significant implications for understanding animal evolutionary relationships.
Purpose of the Study:
- To investigate the potential artifact of long branch attraction (LBA) in previous phylogenetic analyses.
- To re-evaluate the evolutionary placement of flies in relation to vertebrates and nematodes.
Main Methods:
- Phylogenetic analyses utilizing large gene datasets from diverse model animals.
- Computational methods to detect and potentially correct for long branch attraction biases.
Main Results:
- Evidence suggests that the close placement of flies to vertebrates may be an artifact.
- Long branch attraction can significantly distort phylogenetic inferences when analyzing distantly related taxa with large amounts of genetic change.
Conclusions:
- The perceived close evolutionary relationship between flies and vertebrates might be an artifact of long branch attraction.
- Re-evaluation of phylogenetic methods is crucial for accurate reconstruction of evolutionary history, particularly in deep divergences.