Molecular Mechanisms of Regeneration in Echinoderm Systems

Echinoderms exhibit exceptional regenerative capacities, from arm and nerve cord renewal in starfish to whole-organ restoration in sea cucumbers. Central to these processes is the reactivation of developmental programmes and remodelling of the extracellular matrix (ECM). Injury induces dedifferentiation of specialised cells, followed by proliferation and migration guided by conserved signalling pathways such as Wnt, TGF-β, Hippo and MAPK. Matrix metalloproteinases and their inhibitors coordinate ECM breakdown and reconstruction, establishing a scaffold for new tissue growth. Coelomocytes in the coelomic fluid contribute immune surveillance and debris clearance, interfacing with regeneration. Transcription factors including Myc, Sox2 and EGR1 orchestrate gene expression, while mesenchymal–epithelial transitions enable formation of organised epithelia. Comparative transcriptomic analyses reveal both shared molecular signatures and lineage-specific innovations, underlining evolutionary links to vertebrate repair and opening avenues for translational regenerative medicine.

Research from Nature Portfolio

Two transcriptome studies have shed light on early intestinal regeneration in holothurians. De novo assembly comparing mesentery, non-regenerating gut and tissues at 24 h and 3 days post-evisceration in a sea cucumber uncovered thousands of differentially expressed transcripts. Enrichment of developmental and cancer-related transcription factors highlighted key regulators of cell fate and proliferation during the initial recovery phase. In a separate investigation, sequential RNA-sequencing of gut rudiments over three regeneration stages in another sea cucumber identified over 300 transcription factors driving epithelial remodelling and transdifferentiation. Among these, factors such as EGR1, GATA3 and KLF family members were implicated in converting coelomic epithelial cells into enterocytes without a stem-cell intermediate.

Molecular Mechanisms of Regeneration in Echinoderm Systems publication trend

The graph below shows the total number of articles in molecular mechanisms of regeneration in echinoderm systems across all publications each year (not limited to Nature Index journals).

Technical terms

Transcriptome: The full set of RNA molecules expressed by a cell or tissue at a specific time, reflecting active gene activity.

Extracellular matrix (ECM): A network of proteins and polysaccharides providing structural support and regulatory cues to cells during tissue regeneration.

Wnt signalling pathway: A conserved cell-cell communication cascade that regulates gene transcription, controlling cell proliferation and differentiation.

Transdifferentiation: Direct conversion of one specialised somatic cell type into another without reverting to a pluripotent state.

Mesenchymal–epithelial transition (MET): Process by which migratory mesenchymal cells acquire epithelial characteristics and form structured tissues.

Coelomocytes: Free-circulating immune cells in the echinoderm coelomic fluid that participate in phagocytosis, clotting and regeneration support.

References

1. Tissue Extract from Brittle Star Undergoing Arm Regeneration Promotes Wound Healing in Rat. Marine Drugs (2023).
2. Transcriptomic analysis reveals the early body wall regeneration mechanism of the sea cucumber Holothuria leucospilota after artificially induced transverse fission. BMC Genomics (2023).
3. Molecular Aspects of Regeneration Mechanisms in Holothurians. Genes (2021).
4. Regeneration in Echinoderms: Molecular Advancements. Frontiers in Cell and Developmental Biology (2021).
5. The Eupentacta fraudatrix transcriptome provides insights into regulation of cell transdifferentiation. Scientific Reports (2020).
6. Transcriptomic analysis of early stages of intestinal regeneration in Holothuria glaberrima. Scientific Reports (2021).
7. Matrix Metalloproteinases and Tissue Inhibitors of Metalloproteinases in Echinoderms: Structure and Possible Functions. Cells (2021).