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Related Experiment Video

Updated: Feb 22, 2026

Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks

Microinjection for Transgenesis and Genome Editing in Threespine Sticklebacks

Published on: May 13, 2016

Constrained vertebrate evolution by pleiotropic genes.

Haiyang Hu^1,2, Masahiro Uesaka³, Song Guo¹

¹Key Laboratory of Computational Biology, Chinese Academy of Sciences-Max Planck Society Partner Institute for Computational Biology, Chinese Academy of Sciences, Shanghai, 200031, China.

Nature Ecology & Evolution

|October 1, 2017

Summary

This summary is machine-generated.

The phylotype hypothesis, explaining conserved body plans, may apply better to vertebrates than chordates. Intensive gene recruitment during vertebrate organogenesis likely constrained diversification, leading to their common anatomy.

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Last Updated: Feb 22, 2026

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Area of Science:

Developmental biology
Evolutionary biology
Comparative genomics

Background:

Chordates exhibit significant morphological diversity over 550 million years, yet maintain a conserved basic anatomical pattern (bodyplan).
The developmental hourglass model, specifically the phylotype hypothesis, proposes conserved organogenesis stages as the mechanism for this bodyplan conservation.
Previous research lacked quantitative, phylum-wide testing of the phylotype hypothesis across diverse chordate species.

Purpose of the Study:

To quantitatively test the phylotype hypothesis across a broad range of chordate species.
To investigate the role of developmental gene recruitment in the conservation of the vertebrate bodyplan.
To identify mechanisms underlying the conserved anatomical pattern in vertebrates.

Main Methods:

Comparative analysis of embryonic transcriptomic data from eight chordate species.
Quantitative assessment of gene expression patterns during early-to-late embryogenesis.
Correlation analysis between gene recruitment, evolutionary conservation, and developmental essentiality.

Main Results:

The phylotype hypothesis appears more applicable to vertebrates than to the broader phylum Chordata.
Conserved mid-embryonic developmental programs in vertebrates are extensively recruited for other developmental processes.
The extent of gene recruitment positively correlates with evolutionary conservation and essentiality for normal development.

Conclusions:

Intensive recruitment of genetic systems during vertebrate organogenesis may impose pleiotropic constraints, limiting diversification.
These constraints likely explain the conserved anatomical pattern observed across vertebrate species.
The developmental hourglass model's applicability varies across the chordate phylum, with stronger support in vertebrates due to specific gene recruitment dynamics.