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Related Experiment Video

Updated: Jul 10, 2026

Fluorescence-microscopy Screening and Next-generation Sequencing: Useful Tools for the Identification of Genes Involved in Organelle Integrity

Fluorescence-microscopy Screening and Next-generation Sequencing: Useful Tools for the Identification of Genes Involved in Organelle Integrity

Published on: April 13, 2012

Rooting the eukaryote tree by using a derived gene fusion.

Alexandra Stechmann¹, Thomas Cavalier-Smith

¹Department of Zoology, University of Oxford, South Parks Road, Oxford, OX1 3PS, UK. alexandra.stechmann@zoo.ox.ac.uk

Science (New York, N.Y.)

|July 6, 2002

Summary

The root of the eukaryote tree has been elusive due to biases in single-gene analysis. This study uses structural genetic data to reveal that two-cilia groups (bikonts) are derived, placing the root between bikonts and opisthokonts.

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Transforming, Genome Editing and Phenotyping the Nitrogen-fixing Tropical Cannabaceae Tree Parasponia andersonii

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Published on: August 18, 2019

Area of Science:

Evolutionary biology
Phylogenetics
Genomics

Background:

Single-gene phylogenetic trees have historically failed to resolve the eukaryote tree's root.
Systematic biases in sequence evolution complicate accurate phylogenetic reconstruction.

Purpose of the Study:

To identify the root of the eukaryote tree using structural genetic data.
To investigate deep phylogenetic relationships by analyzing gene fusion events across major protist groups.

Main Methods:

Searched major protist groups for the presence or absence of a specific gene fusion.
Utilized structural genetic data as a more reliable alternative to sequence-based evolutionary analyses.

Main Results:

Demonstrated that all eukaryote groups with two cilia (bikonts) are evolutionarily derived.
Established the root of the eukaryote tree lies between bikonts and opisthokonts (animals, Fungi, Choanozoa).
Suggests Amoebozoa diverged earlier or are sister to bikonts/opisthokonts.

Conclusions:

Structural genetic data provides a robust method for resolving deep eukaryotic phylogeny.
The traditional view of eukaryotic relationships needs revision based on these findings.
The study redefines the basal branching order of eukaryotes.