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Independence of alignment and tree search
1Department of Evolution, Ecology and Organismal Biology, The Ohio State University Herbarium, 1315 Kinnear Road, Columbus, OH 43212, USA. psimmons@lamar.colostate.edu
Molecular Phylogenetics and Evolution
|May 4, 2004
Summary
Similarity is the best homology criterion for sequence alignment, mirroring morphological analysis. Parsimony-based methods can bias alignments, compromising phylogenetic tests by favoring congruence over accuracy.
Area of Science:
- Bioinformatics
- Computational Biology
- Evolutionary Biology
Background:
- Sequence alignment is crucial for biological sequence analysis.
- Homology criteria guide alignment construction and interpretation.
- Phylogenetic analysis relies on accurate sequence alignments to infer evolutionary relationships.
Purpose of the Study:
- To advocate for similarity as the primary homology criterion in sequence alignment.
- To evaluate the impact of parsimony-based tree length selection on alignment quality.
- To assess how alignment parameter selection affects the rigor of phylogenetic hypothesis testing.
Main Methods:
- The study conceptually evaluates alignment methods like MALIGN and POY.
- It analyzes the relationship between parsimony-based tree lengths and evolutionary models.
- The research focuses on the principle of congruence in phylogenetic data combination.
Main Results:
- Similarity is proposed as the most appropriate homology criterion for sequence alignment.
- Parsimony-based tree length selection can lead to alignments consistent with minimum-evolution models.
- Favoring congruence among characters during alignment parameter selection can weaken phylogenetic tests.
Conclusions:
- Similarity should be the standard homology criterion for sequence alignment.
- Alignment methods should be carefully chosen to avoid compromising phylogenetic inference.
- Rigorous phylogenetic testing requires objective alignment parameter selection, not congruence-driven bias.