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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin

Published on: August 14, 2018

ONTOGENY AND PHYLOGENETIC SYSTEMATICS.

Arnold G Kluge¹

¹Museum of Zoology and Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor MI 48109.

Cladistics : the International Journal of the Willi Hennig Society

|December 31, 2021

Summary

Evolutionary developmental biology faces challenges in determining genealogical hierarchies. Ontogenetic transformation series alone are insufficient due to processes like dedifferentiation and paedomorphosis, requiring careful assumptions for accurate phylogenetic reconstruction.

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Area of Science:

Evolutionary biology
Developmental biology
Phylogenetics

Background:

Determining genealogical hierarchies is crucial in evolutionary biology.
Ontogenetic transformation series, which track developmental changes, are commonly used.
However, certain developmental processes complicate their interpretation.

Purpose of the Study:

To evaluate the limitations of using ontogenetic transformation series for deducing genealogical hierarchy.
To examine the theoretical underpinnings and assumptions of methods like ontogenetic character precedence.
To highlight the challenges in establishing robust phylogenetic relationships based solely on developmental data.

Main Methods:

Analysis of developmental processes such as dedifferentiation and paedomorphosis.
Critique of the 'outgroup criterion' and 'ontogenetic character precedence' in phylogenetic inference.
Theoretical examination of assumptions required for using ontogeny in genealogy.

Main Results:

Dedifferentiation, paedomorphosis, and the gain/loss of developmental stages hinder direct genealogical deduction from ontogeny.
Ontogenetic character precedence, similar to the outgroup criterion, is not theory-neutral and relies on specific assumptions.
The interpretation of ontogenetic data for phylogenetic purposes is inherently assumption-laden.

Conclusions:

Sole reliance on ontogenetic transformation series is insufficient for accurate genealogical hierarchy determination.
Phylogenetic methods using ontogenetic data require explicit acknowledgment and justification of underlying assumptions.
Robust phylogenetic reconstruction necessitates integrating multiple lines of evidence beyond ontogeny.