Phylogenetic Analysis of Bacterial Pathogen Genomes

Area of Science:

• Genomics
• Evolutionary Biology
• Microbial Pathogenesis

Background:

• High-throughput sequencing dramatically reduces bacterial pathogen genome sequencing costs and time.
• Phylogenetic trees are standard for depicting bacterial pathogen genome relationships.
• Homologous recombination frequently disrupts standard phylogenetic analyses in bacteria.

Purpose of the Study:

• To develop a method for phylogenetic analysis that explicitly accounts for homologous recombination.
• To enable more accurate reconstruction of bacterial pathogen evolutionary histories.
• To investigate recombination events within bacterial populations.

Main Methods:

• Development of a novel phylogenetic analysis method.
• Application of the method to bacterial pathogen genome datasets.
• Comparison of results with standard phylogenetic approaches.

Main Results:

• The new method successfully accounts for the disruptive effects of recombination.
• Recombination events within bacterial populations can be investigated.
• More accurate clonal genealogies representing genome relationships are recovered.

Conclusions:

• Standard phylogenetic tools are often invalidated by homologous recombination in bacterial pathogens.
• The developed method provides a more meaningful approach to bacterial phylogenetics.
• This method allows for the recovery of true clonal relationships and investigation of recombination.