Caudal Autotomy and Regeneration in Reptilian Systems

Caudal autotomy, the voluntary shedding of the tail, is a widespread antipredator strategy among lepidosaurs that allows individuals to escape predation at the cost of appendage loss. Following autotomy, reptiles initiate a complex regenerative programme that restores tail length and function through sequential phases of wound healing, blastema formation and tissue differentiation. Regenerated tails typically exhibit distinct structural and histological features compared with the original, including a continuous cartilaginous rod replacing segmented vertebrae, modified muscle architecture and altered scale patterns. The capacity for regrowth varies among lineages: most lizards regenerate functional tails rapidly, whereas tuatara and some geckos display slower, partial restoration often described as “regengrow,” combining somatic growth with limited tissue replacement. Tail regeneration entails energetic trade-offs, influencing growth, reproduction and locomotion, and can alter subsequent autotomy events due to the absence of preformed fracture planes in the regenerated tissue. Studies across diverse reptilian clades have begun to elucidate the molecular controls of blastema proliferation and patterning, the biomechanical properties of regenerated tails and the ecological implications of repeated tail loss and regrowth in natural populations.

Research from Nature Portfolio

Recent studies have revealed that regenerated tails, once assumed incapable of further autotomy, can undergo re-regeneration following mechanical shearing. Investigations in multiple wild populations of a large skink species demonstrated that up to one quarter of total tail length may be comprised of re-regenerated tissue, suggesting that even cartilage-based regenerates retain the capacity for new outgrowth when subjected to trauma. This unexpected plasticity may mitigate fitness costs associated with tail loss by restoring important functions such as locomotion, fat storage and social signalling more effectively than once thought, highlighting a previously underappreciated dimension of sequential regeneration in reptiles.

Caudal Autotomy and Regeneration in Reptilian Systems publication trend

The graph below shows the total number of articles in caudal autotomy and regeneration in reptilian systems across all publications each year (not limited to Nature Index journals).

Technical terms

Caudal autotomy: Voluntary self-amputation of the tail at specialised fracture planes to evade predation.

Blastema: A mass of proliferating progenitor cells that forms at the amputation plane and drives new tissue outgrowth.

Fracture plane: A predetermined region within or between vertebrae along which the tail is shed.

Regengrow: A combined process of continuous somatic growth and limited regenerative tissue replacement observed in some ectothermic amniotes.

References

1. Regeneration in Reptiles Generally and the New Zealand Tuatara in Particular as a Model to Analyse Organ Regrowth in Amniotes: A Review. Journal of Developmental Biology (2021).
2. Autotomy and Regeneration in Squamate Reptiles (Squamata, Reptilia): Defensive Behavior Strategies and Morphological Characteristics (Using Computer Microtomography Methods). Biology Bulletin (2020).
3. Re-regeneration to reduce negative effects associated with tail loss in lizards. Scientific Reports (2019).
4. At What Cost? Trade-Offs and Influences on Energetic Investment in Tail Regeneration in Lizards Following Autotomy. Journal of Developmental Biology (2021).