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#epimorphosis

2 public questions tagged with this topic.

Regeneration -lll

Blastema in epimorphosis primarily consists of:

Epimorphic blastema formed after amputation does not consist of pluripotent embryonic stem cells but of lineage-restricted yet multipotent progenitor cells derived via dedifferentiation of stump tissues. Muscle-derived blastema cells predominantly regenerate muscle, dermal fibroblasts generate cartilage and connective tissue, Schwann cells generate nerves, yet plasticity permits limited transdifferentiation under signals. Single-cell transcriptomics show blastema cells express progenitor markers Prrx1, Msx1, maintain positional memory via Meis, Hox gradients. Thus blastema comprises multipotent progenitor pool capable of producing multiple cell types needed for limb reconstruction while retaining memory of tissue origin and position.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 21: Blastema composition as multipotent progenitors in epimorphosis.

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Regeneration -lll

Which process primarily distinguishes morphallaxis from epimorphosis?

Primary distinction separating morphallaxis from epimorphosis lies in amount and mechanism of new tissue production. Morphallaxis achieves restoration by remodeling existing structures with minimal proliferation, repatterning via gradients, cell migration, selective death, mass remains constant or decreases as seen in Hydra. Epimorphosis entails extensive growth through blastema formation involving dedifferentiation, significant cell division increasing tissue mass to rebuild lost parts as in salamander limb. Stem cell contribution differs: morphallaxis uses transdifferentiation, epimorphosis uses proliferative progenitors. Hence quantitative difference in new growth amount defines conceptual separation.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 21: Distinguishing morphallaxis from epimorphosis by growth amount.

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