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Rings Reconcile Genotypic and Phenotypic Evolution within the Proteobacteria.

James A Lake1, Joseph Larsen2, Brooke Sarna2

  • 1University of California, Los Angeles lake@mbi.ucla.edu.

Genome Biology and Evolution
|December 15, 2015
PubMed
Summary
This summary is machine-generated.

This study resolves the genotype-phenotype conflict in prokaryotic evolution using rooted ring analyses. Proteobacterial evolution is explained by gene flows and endosymbioses, not just traditional phylogenetic trees.

Keywords:
chlorophyllsendosymbiosesgene losses/gainsgenotypesphenotypesphylogenetic classificationrooting rings

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Area of Science:

  • Evolutionary Biology
  • Microbial Phylogenetics
  • Genomics

Background:

  • Prokaryotic classification faces a crisis due to discrepancies between molecular phylogenies and phenotypes.
  • Traditional phylogenetic trees struggle to reconcile genotypic and phenotypic data, particularly within diverse phyla like Proteobacteria.

Purpose of the Study:

  • To resolve the disconnection between genotypes and phenotypes in prokaryotic evolutionary biology.
  • To reconstruct the evolutionary history of Proteobacteria using novel rooted ring analyses.

Main Methods:

  • Developed and applied rooted ring analyses incorporating genomic data and goods thinking.
  • Utilized protein family data and genome-based outgroup rooting procedures.
  • Mapped gene flows related to DNA, RNA, ATP, and membrane processes.

Main Results:

  • Reconstructed complex evolutionary histories of Proteobacteria, revealing combinations of tree-like divergences and endosymbiotic-like convergences.
  • Identified significant gene flows within Proteobacteria, consistent with endosymbiotic events (P < 3.6 × 10⁻⁹).
  • Demonstrated that rooted rings, unlike trees, explain observed genotypic and phenotypic relationships, including the origin of photosynthesis in Alpha-, Beta-, and Gammaproteobacteria.

Conclusions:

  • Rooted ring phylogenies provide a unified framework for understanding prokaryotic evolution, reconciling genotype and phenotype.
  • Gene flows and endosymbioses are critical drivers of evolution within major prokaryotic phyla.
  • This approach clarifies the origin of conflicts between genotypic and phenotypic data in evolutionary studies.