Summary
Some animals reactivate developmental programs to regrow organs after injury.
In depth
Zebrafish regrow fins and hearts; axolotls replace limbs by forming a blastema from dedifferentiated cells; mammalian neonatal hearts regenerate but adults scar. Understanding signals may allow therapies.
Regeneration involves wound epidermis, blastema formation and re-use of developmental signals. Mammals have reduced regeneration probably due to scarring and immune differences.
Remember: planarians regenerate whole bodies from tiny fragments using neoblasts.
Many animals regrow body parts: planarians regenerate whole bodies from fragments using neoblast stem cells; hydra renew themselves continually; zebrafish regrow fins, heart muscle and spinal cord; salamanders replace limbs, lens and tail through a blastema of dedifferentiated cells.
Regeneration often redeploys embryonic programmes (Wnt, FGF, BMP, Hox) and needs nerves and a wound epidermis. Mammals have limited ability, such as the liver regrowing and deer antlers, and neonatal mice can regenerate heart tissue for about a week.
Example: axolotls can regenerate limbs repeatedly without scars.
Frequently asked questions
What is Regenerative Development?
Some animals reactivate developmental programs to regrow organs after injury.
Which area of biology covers Regenerative Development, and how advanced is it?
Regenerative Development is one of the 54 topics in Developmental Biology. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Induction, Embryo, Epithelial-Mesenchymal Transition.
Why does Regenerative Development matter?
Understanding why humans mostly scar could lead to regenerative treatments.
Can you give an example of Regenerative Development?
Spiny mice regrow skin and ear tissue.
What should I learn before Regenerative Development?
Work through the Beginner topics in Developmental Biology first, such as Fertilisation, Zygote, Embryo, then return to Regenerative Development. Advanced topics assume the Intermediate vocabulary.
What topics are related to Regenerative Development?
The closest topics to Regenerative Development are Induction, Embryo, Epithelial-Mesenchymal Transition, Reprogramming and Transdifferentiation. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Regenerative Development?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Regenerative Development. To practise the whole of Developmental Biology, use the Developmental Biology quiz.
How is Regenerative Development different from Induction?
Regenerative Development: Some animals reactivate developmental programs to regrow organs after injury. Induction: One group of cells signals a neighbouring group to change its developmental path. Read both side by side and note what each one explains.
How should I study Regenerative Development step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Induction and explain the difference aloud. Finally, take the Developmental Biology quiz and come back to this page for any question you miss.