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Related Experiment Videos

What can and what cannot be inferred from pairwise sequence comparisons?

E Baake1

  • 1Zoologisches Institut, Universität München, Germany. baake@zi.biologie.uni-muenchen.de

Mathematical Biosciences
|February 17, 1999
PubMed
Summary
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Theoretical population biology·1999

Molecular phylogeny can reconstruct tree topology but not all evolutionary transition matrices. Identifiability of evolutionary history is lost when sequence evolution rates vary across sites.

Area of Science:

  • Computational Biology
  • Evolutionary Biology
  • Phylogenetics

Background:

  • Phylogenetic trees model evolutionary history.
  • Reconstructing these trees from sequence data is crucial for understanding evolution.
  • Identifiability of tree topology and evolutionary processes is a key challenge.

Purpose of the Study:

  • To investigate the identifiability of molecular phylogenetic trees and evolutionary parameters.
  • To determine which aspects of evolutionary history can be reliably inferred from sequence data.
  • To explore the impact of different evolutionary models on identifiability.

Main Methods:

  • Analysis of identifiability in phylogenetic inference.
  • Mathematical modeling of sequence evolution using Markov processes.

Related Experiment Videos

  • Examination of pairwise joint distributions of sequences at tree leaves.
  • Consideration of models with site-independent and site-varying evolutionary rates.

    • Main Results:

    • Under identical and independent site evolution, tree topology is identifiable, but one-way transition matrices are not; return-trip matrices are partially reconstructible.
    • When evolutionary rates vary across sites, topology identifiability is lost, even with known rate distributions.
    • Identifiability is discussed in relation to additive measures of phylogenetic distance.

    Conclusions:

    • The identifiability of molecular phylogenetic history is constrained by the evolutionary model.
    • Site-varying rates significantly reduce the information available for topology reconstruction from pairwise comparisons.
    • Understanding these limitations is essential for accurate phylogenetic inference and interpretation.