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18S rDNA sequence-structure phylogeny of the Euglenophyceae (Euglenozoa, Euglenida).

Antonia S Rackevei1, Anna Karnkowska2, Matthias Wolf1

  • 1Department of Bioinformatics, Biocenter, University of Würzburg, Würzburg, Germany.

The Journal of Eukaryotic Microbiology
|December 8, 2022
PubMed
Summary
This summary is machine-generated.

This study reconstructs the Euglenophyceae phylogeny using combined sequence and structural data. Integrating these datasets improves phylogenetic accuracy and robustness, yielding higher bootstrap values for Euglenophyceae relationships.

Keywords:
euglenaeuglenidsphylogeneticssecondary structure

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Area of Science:

  • * Molecular Phylogenetics
  • * Eukaryotic Microbiology
  • * Euglenoid Taxonomy

Background:

  • * The evolutionary history of Euglenophyceae (Euglenozoa, Euglenida) remains a subject of extensive research, with recent discoveries of new genera.
  • * Previous phylogenetic studies often relied on limited genetic markers, necessitating more comprehensive approaches.

Purpose of the Study:

  • * To reconstruct a robust phylogeny of Euglenophyceae by integrating 18S rDNA sequence and structural data.
  • * To evaluate the efficacy of combined sequence-structure data in resolving phylogenetic relationships within Euglenophyceae.

Main Methods:

  • * Phylogenetic reconstruction using 18S rDNA sequence and predicted secondary structure data.
  • * Homology modeling for secondary structure prediction and sequence-structure data encoding.
  • * Phylogenetic analyses including Neighbor-Joining, Maximum Parsimony, and Maximum Likelihood.

Main Results:

  • * A comprehensive sequence-structure Neighbor-Joining tree encompassing over 300 Euglenophyceae taxa was generated.
  • * Monophyly was supported for several genera including Eutreptiella, Discoplastis, Lepocinclis, Strombomonas, Cryptoglena, Monomorphina, Euglenaria, and Colacium.
  • * Analyses using combined data yielded significantly higher bootstrap values compared to sequence-only analyses.

Conclusions:

  • * The simultaneous use of sequence and structural data offers a more accurate and robust method for phylogenetic reconstruction.
  • * This integrated approach shows promise for resolving evolutionary relationships among closely related taxa within Euglenophyceae.