Research Reveals Oxygen's Role in Limb Regeneration Differences Between Amphibians and Mammals
A study led by Can Aztekin at the Ecole Polytechnique Federale de Lausanne has uncovered the role of oxygen in the ability of amphibians to regenerate limbs, a capability that mammals lack. The research, published in Science, involved comparing the regenerative processes of frog tadpoles and embryonic mice. It was found that the way cells sense oxygen is crucial in determining whether regeneration can occur. Amphibians, which often develop in low-oxygen aquatic environments, have a reduced oxygen-sensing capacity that allows them to sustain regenerative programs. In contrast, mammalian cells, exposed to higher oxygen levels, tend to switch off regeneration early. The study suggests that mammals may have a latent regenerative capacity that could be activated by manipulating oxygen-sensing pathways. 
