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The genomic tree as revealed from whole proteome comparisons
1Unité de Génétique Moléculaire des Levures [URA1300 Centre National de la Recherche Scientifique (CNRS) and UFR927 University Pierre and Marie Curie], Institut Pasteur, 75724 Paris Cedex 15, France. tekaia@pasteur.fr
Genome Research
|July 13, 1999
Summary
Genomic trees classify organisms by gene content, revealing evolutionary relationships similar to traditional phylogenies. This approach aids in understanding species
Area of Science:
- Genomics
- Bioinformatics
- Evolutionary Biology
Background:
- Complete cellular genome sequences enable organism classification based on gene content and similarities.
- Gene loss, acquisition, and overall similarity serve as indicators of common ancestry.
Purpose of the Study:
- To introduce a methodological framework for classifying genomes using gene content.
- To construct genomic trees and compare them with established phylogenetic methods.
Main Methods:
- Correspondence analysis and hierarchical classification methods were employed.
- Analysis included 20 completely sequenced genomes and partial data for three species.
Main Results:
- A classification termed 'genomic trees' was generated, showing strong phylogenetic signatures.
- These genomic trees closely resemble 16S-like ribosomal RNA (rRNA)-based phylogenies.
- Genomic trees place Archaea near Bacteria when whole gene content is considered, excluding ancestral duplications.
Conclusions:
- Genomic trees offer a novel approach to understanding evolution at the genomic level.
- The findings suggest similar patterns of gene duplication and deletion in related organisms.
- This method can enhance the assessment of evolutionary relationships between extant species.