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Updated: Mar 6, 2026

Generation and Long-term Maintenance of Nerve-free Hydra
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System of stability and lability in hydra.

Sivatosh Mookerjee1, Arup Sinha1

  • 1Department of Zoology, Presidency College, Calcutta, India.

Wilhelm Roux' Archiv Fur Entwicklungsmechanik Der Organismen
|March 18, 2017
PubMed
Summary

Hydra

Area of Science:

  • Developmental biology
  • Epigenetics
  • Cellular plasticity

Background:

  • Hydra exhibits a unique epigenetic system with cellular stability and lability.
  • Specific regions of Hydra, the hypostome and basal disc, are unipotential.
  • The area between these regions is bipotential, capable of forming either structure.

Purpose of the Study:

  • To explain the dynamic instability in Hydra's mid-equipotential system.
  • To investigate the transformation mechanisms of the bipotential region under developmental urgency.
  • To compare the developmental power of the hypostome versus the basal disc.

Main Methods:

  • The study assumes an inhibitory complex action.
  • Analysis of developmental pathways in Hydra.

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  • Comparative study of developmental centers.

    • Main Results:

    • The mid-equipotential system can transform into unipotential structures during developmental urgency.
    • An inhibitory complex is hypothesized to mediate this transformation.
    • The hypostome demonstrates greater developmental potency than the basal disc.

    Conclusions:

    • Hydra's epigenetic system allows for cellular plasticity and transformation.
    • Developmental urgency can trigger shifts from bipotential to unipotential states.
    • The hypostome is a more dominant developmental center in Hydra.