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Related Experiment Video

Updated: Jun 17, 2026

Generation and Long-term Maintenance of Nerve-free Hydra

Generation and Long-term Maintenance of Nerve-free Hydra

Published on: July 7, 2017

How Hydra senses and destroys microbes.

René Augustin¹, Sebastian Fraune, Thomas C G Bosch

¹Zoological Institute, Christian-Albrechts-University Kiel, Olshausenstrasse 40, 24098 Kiel, Germany.

Seminars in Immunology

|December 17, 2009

Summary

Ancient animals like Hydra possess innate immune sensors crucial for pathogen defense and maintaining tissue-microbiota balance. These findings highlight the shared evolutionary origins of invertebrate and mammalian immune systems from common ancestral components.

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Area of Science:

Evolutionary biology
Immunology
Invertebrate biology

Background:

Innate immunity is a fundamental defense mechanism present across diverse animal species.
Understanding the evolutionary origins of immunity provides insights into conserved biological processes.
Cnidarians, like Hydra, represent early branching animals offering a unique perspective on ancient biological systems.

Purpose of the Study:

To investigate the evolutionary history of innate immune sensors.
To explore the functional roles of innate immunity in ancient animals.
To establish evolutionary connections between invertebrate and mammalian immune pathways.

Main Methods:

Molecular genetic analysis of innate immune system components in Hydra.
Comparative genomics to identify conserved immune-related genes.
Functional assays to determine the roles of Hydra immune effectors.

Main Results:

Molecular genetic data confirms the presence of basic innate immune sensor templates in ancient cnidarians like Hydra.
Hydra's immune system plays a vital role in pathogen defense and regulating the tissue-microbiota relationship.
Evidence suggests that both invertebrate and mammalian immune systems evolved from a limited set of ancestral building blocks.

Conclusions:

The foundational elements of innate immunity were established in early animal evolution.
Conserved immune pathways in invertebrates and mammals share deep evolutionary roots.
Studying ancient organisms like Hydra is key to understanding the fundamental principles of immunity.