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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Paramecium: RNA sequence-structure phylogenetics.

Marlyn Weimer1, Peter Vďačný2, Matthias Wolf1

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

International Journal of Systematic and Evolutionary Microbiology
|April 6, 2023
PubMed
Summary
This summary is machine-generated.

This study enhances phylogenetic tree accuracy for single-celled eukaryotes like Paramecium using RNA sequence-structure data. The findings support integrating sequence-structure information for robust evolutionary analyses.

Keywords:
18SITS2ParameciumciliatesrRNAsecondary structure

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Area of Science:

  • Eukaryotic Phylogenetics
  • Molecular Evolution
  • Bioinformatics

Background:

  • The genus Paramecium, a well-known group of single-celled eukaryotes, has an unresolved phylogeny.
  • Previous phylogenetic analyses have faced challenges in accuracy and robustness.

Purpose of the Study:

  • To improve the accuracy and robustness of phylogenetic trees within the genus Paramecium.
  • To investigate the utility of an RNA sequence-structure approach for phylogenetic reconstruction.

Main Methods:

  • Predicted secondary structures for 18S and internal transcribed spacer 2 (ITS2) RNA sequences using homology modeling.
  • Reconstructed phylogenetic trees using sequence-structure data with neighbor-joining, maximum-parsimony, and maximum-likelihood methods.
  • Identified a novel three-helix structure for ITS2 in Paramecium, contrasting with the four-helix structure in Tetrahymena.

Main Results:

  • Reconstructed robust phylogenetic trees using combined ITS2 and 18S rDNA sequence-structure data.
  • Achieved well-supported trees with bootstrap values over 50 in applied analyses.
  • Demonstrated general agreement with existing multi-gene phylogenetic analyses.

Conclusions:

  • The RNA sequence-structure approach provides accurate and robust phylogenetic reconstructions.
  • Simultaneous use of sequence and structure data is supported for enhancing phylogenetic analyses.
  • The study contributes to resolving the phylogeny within the genus Paramecium.