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A Systematic Approach to Bacterial Phylogeny Using Order Level Sampling and Identification of HGT Using Network

Ehdieh Khaledian1, Kelly A Brayton1,2,3, Shira L Broschat1,2,3

  • 1School of Electrical Engineering and Computer Science, Washington State University, P.O. Box 642752, Pullman, WA 99164, USA.

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Summary
This summary is machine-generated.

This study introduces a novel phylogenetic tree construction method using whole bacterial proteomes. It identifies conserved protein sequences to reveal evolutionary relationships and detect horizontal gene transfer events.

Keywords:
horizontal gene transfernetwork of bacterianetwork sciencephylogenytree of bacterial phyla

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Area of Science:

  • Genomics
  • Bioinformatics
  • Evolutionary Biology

Background:

  • Phylogenetic tree reconstruction historically relied on single genes (e.g., rRNA) or ad hoc gene combinations.
  • Limited gene sets can lead to less robust evolutionary inferences.
  • Increasing availability of complete genomes enables whole-genome-based phylogenetic analyses.

Purpose of the Study:

  • To develop a systematic approach for constructing phylogenetic trees using complete bacterial proteomes.
  • To identify conserved protein sequences for robust evolutionary analysis.
  • To detect horizontal gene transfer events in bacterial species.

Main Methods:

  • Clustering of complete proteomes from 360 bacterial species.
  • Identification of 49 protein sequences shared by 99% of the organisms.
  • Construction of a phylogenetic tree using these conserved proteins.
  • Network analysis of homologous clusters to identify horizontal gene transfer.

Main Results:

  • A phylogenetic tree was constructed based on 49 conserved protein sequences from 360 bacterial species.
  • 47 of these sequences showed homology across bacteria, archaea, and eukarya.
  • A network analysis successfully identified bacterial species with horizontally transferred genes.

Conclusions:

  • Whole-proteome analysis offers a more robust method for phylogenetic reconstruction than traditional gene-based approaches.
  • The identified conserved proteins are valuable markers for bacterial phylogeny.
  • The method effectively detects horizontal gene transfer, providing insights into bacterial evolution.