The axolotl, a critically endangered amphibian native to Mexico, is gaining attention from scientists for its remarkable ability to regrow its limbs. This enigmatic creature, named after the Aztec god of fire and lightning, has been dubbed the "Peter Pan of the salamander world" due to its unique ability to stay in a permanent tadpole form.
The axolotl's regenerative powers have sparked the interest of researchers, who are studying its ability alongside that of mice and zebrafish. Each of these species has its own unique regenerative abilities, with zebrafish able to regrow their tail fins and internal tissues, and mice able to regrow the tips of their digits. In research published in the Proceedings of the National Academy of Sciences, the team identified a common genetic mechanism that could support therapies to regrow human limbs.
Globally, more than one million limb amputations take place each year due to conditions such as diabetes, injury, cancer, and infection. Researchers believe that their findings could help humans resolve this issue by regenerating limbs like the animals studied. They focused on so-called SP genes, which are essential for regeneration in all three species.
Using gene-editing techniques, scientists removed SP8 from axolotls, preventing proper regrowth of limb bones. Similar effects were seen in mice lacking SP6 and SP8. Building on these findings, researchers developed an experimental gene therapy using a regeneration enhancer identified in zebrafish. The therapy delivered a molecule known as FGF8, helping to stimulate bone regrowth in mice and partially compensate for the missing genes.
The study, involving collaboration across different fields and model organisms, has been hailed as an important step towards future treatments. Researchers caution that significant work remains before such approaches could be applied to humans. However, they describe the study as a powerful example of the potential for interdisciplinary collaboration in advancing our understanding of regenerative biology.
According to the researchers, the key to the breakthrough was the collaboration across different fields and model organisms. They noted that scientists often work in silos, focusing on a single species or model. However, the study demonstrated the power of working across different organisms, highlighting the potential for future breakthroughs in regenerative biology.
