A Universal Regeneration Blueprint Could Restore Limbs
Scientists identify a conserved set of SP genes that govern limb regeneration across axolotls, zebrafish, and mice. By using a zebrafish-derived enhancer to drive a viral delivery of FGF8, they partially restore digit bone regrowth in mice, showing that reactivating the epidermal SP program can trigger regenerative pathways. While not yet applicable to full human limbs, this work provides a foundational gene-therapy approach that could complement bioengineered scaffolds and stem-cell strategies in the long term, moving toward true limb restoration rather than prosthetics.