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Stem cell dynamics in Cnidaria: are there unifying principles?

David A Gold¹, David K Jacobs

¹Department of Ecology and Evolutionary Biology, University of California, Los Angeles, 2154 Terasaki Life Science Building, Los Angeles, CA 90095, USA.

Development Genes and Evolution

|November 27, 2012

Summary

Cnidarian stem cell research, mainly in Hydra, struggles to identify homologous cells in other groups. Ancestral cnidarian development likely relied on epithelial cell plasticity rather than distinct stem cell lines.

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Published on: November 26, 2019

Area of Science:

Developmental biology
Cell biology
Evolutionary biology

Background:

Cnidarian stem cell research has historically centered on the genus Hydra.
Identifying homologous stem cell populations outside of Hydrozoa is challenging due to stem cell simplicity and limited gene expression data.
The role of interstitial cells (I-cells) in Hydra is well-studied, but their counterparts in non-hydrozoan cnidarians remain unclear.

Purpose of the Study:

To investigate the evolutionary origins and potential homology of stem cell-like populations in cnidarians.
To explore alternative models for cell self-renewal and differentiation in non-hydrozoan cnidarians.
To propose a hypothesis regarding the evolution of stem cell regulation in cnidarians.

Main Methods:

Comparative analysis of existing literature on cnidarian cell biology and genetics.
Review of evidence for stem cell homologues, including interstitial cells and amoebocytes.
Hypothesis generation based on developmental and evolutionary principles.

Main Results:

Morphological simplicity and inconclusive gene expression data complicate the identification of stem cell homologues outside Hydrozoa.
Amoebocytes in non-hydrozoan cnidarians are enigmatic, with limited evidence supporting homology to Hydra's I-cells.
Epithelial cell self-renewal and transdifferentiation were likely more significant in ancestral cnidarian development than undifferentiated cell lineages.

Conclusions:

The evolution of distinct stem cell lines in cnidarians may have occurred later than previously thought.
Ancestral cnidarian development may have relied on epithelial plasticity, with stem cell regulation evolving subsequently.
Further genetic and developmental studies across diverse cnidarian models are necessary to test current hypotheses.