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Updated: Jun 17, 2026

Generation of Transgenic Hydra by Embryo Microinjection

Generation of Transgenic Hydra by Embryo Microinjection

Published on: September 11, 2014

Axial patterning in hydra.

¹Department of Developmental and Cell Biology, University of California Irvine, California 92697, USA. hrbode@uci.edu

Cold Spring Harbor Perspectives in Biology

|January 13, 2010

Summary

Hydra utilize two signaling gradients for pattern formation: one promotes head development during regeneration and budding, while the other inhibits it. The Wnt pathway is crucial for maintaining the head organizer.

Area of Science:

Developmental Biology
Cell Signaling
Regenerative Biology

Background:

Morphogen gradients are essential for pattern formation in embryonic development.
Adult hydra exhibit continuous axial patterning due to tissue dynamics.
An organizer region in the hydra head produces two key signaling gradients.

Purpose of the Study:

To investigate the roles of two signaling gradients in hydra axial patterning.
To understand the mechanisms underlying head activation and inhibition gradients.
To explore the molecular basis of these gradients, particularly the Wnt pathway's involvement.

Main Methods:

Analysis of morphogen gradient functions in hydra regeneration and budding.
Investigating the signaling molecules responsible for head activation and inhibition.

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Last Updated: Jun 17, 2026

Generation of Transgenic Hydra by Embryo Microinjection

Generation of Transgenic Hydra by Embryo Microinjection

Published on: September 11, 2014

Generation and Long-term Maintenance of Nerve-free Hydra

Generation and Long-term Maintenance of Nerve-free Hydra

Published on: July 7, 2017

Examining the role of the canonical Wnt pathway in maintaining the head organizer.

Main Results:

One gradient activates head formation capacity in the body column during budding and regeneration.
A second gradient inhibits head formation, restricting budding to the lower body column.
The canonical Wnt pathway is confirmed to be central to establishing and maintaining the head organizer.

Conclusions:

Two distinct signaling gradients control axial patterning in adult hydra.
These gradients regulate head formation and budding, crucial for asexual reproduction and regeneration.
The Wnt pathway is a key molecular component of the head organizer, essential for gradient maintenance.