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Related Experiment Videos

Probabilistic analysis indicates discordant gene trees in chloroplast evolution.

Claus Vogl1, Jonathan Badger, Paul Kearney

  • 1Department of Computer Science, University of California, Riverside, CA 92521, USA. vogl@i122server.vu-wien.ac.at

Journal of Molecular Evolution
|March 4, 2003
PubMed
Summary

This study introduces a probabilistic model to analyze gene tree heterogeneity in plastid genomes. Findings reveal significant evolutionary divergence among genes, challenging assumptions of homogeneity.

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Area of Science:

  • Evolutionary biology
  • Genomics
  • Phylogenetics

Background:

  • Whole-genome analyses often show gene trees diverging from the overall species phylogeny.
  • Plastid genomes are expected to have homogeneous gene trees due to non-recombining, block transmission, yet heterogeneity has been observed.

Purpose of the Study:

  • To develop and apply a probabilistic model to account for gene tree heterogeneity in plastid genomes.
  • To investigate the extent and causes of phylogenetic incongruence among plastid genes across diverse taxa.

Main Methods:

  • Development of a probabilistic model to handle heterogeneity among gene trees.
  • Implementation of the model using a Gibbs sampler.
  • Application to a dataset of 14 taxa, including land plants, green algae, red algae, diatoms, and cyanobacteria.

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Main Results:

  • No single dominant consensus tree was found; genes were divided into those following a consensus and those with independent histories.
  • Gene tree patterns were largely independent of data processing, analysis methods, gene collinearity, functional relationships, and amino acid composition bias.
  • Inverted repeat regions in red algae and Cyanophora showed copy differences, suggesting a role in gene duplication.

Conclusions:

  • Significant gene tree heterogeneity exists within plastid genomes, contradicting expectations of homogeneity.
  • Gene duplication via inverted repeat regions is a plausible mechanism for observed phylogenetic incongruence.
  • Horizontal gene transfer is considered less likely as a primary driver of this heterogeneity.