The type of salamander called axolotl, with its frilly gills and widely spaced eyes, looks like an alien and has other-worldly powers of regeneration. Lose a limb, part of the heart or even a large portion of its brain? No problem: They grow back.
© | In the search for keys to regeneration, scientists ask a lot of the axolotl

"It regenerates almost anything after almost any injury that doesn't kill it," said Parker Flowers, a postdoctoral associate in the lab of Craig Crews, the John C. Malone Professor of Molecular, Cellular, and Developmental Biology and professor of chemistry and pharmacology.
If scientists can find the  for the axolotl's ability to regenerate, they might be able to find ways to restore damaged tissue in humans. But they have been thwarted in the attempt by another peculiarity of the axolotl—it has the largest genome of any animal yet sequenced, 10 times larger than that of humans.
Now Flowers and colleagues have found an ingenious way to circumvent the animal's complex genome to identify at least two genes involved in , they report Jan. 28 in the journal eLife.
The advent of new sequencing technologies and gene-editing technology has allowed researchers to craft a list of hundreds of gene candidates that could responsible for the regeneration of limbs. However, the huge size of the axolotl genome populated by vast areas of repeated stretches of DNA has made it difficult to investigate the function of those genes.
Lucas Sanor, a former graduate student in the lab, and fellow co-first author Flowers used gene editing techniques in a multi-step process to essentially create markers that could track 25 genes suspected of being involved in limb regeneration. The method allowed them to identify two genes in the blastema a mass of dividing cells that form at the site of a severed  that was also responsible for partial regeneration of the  tail.
Flowers stressed that many more such genes probably exist. Since humans possess similar , the researchers say, scientists may one day discover how to activate them to help speed wound repair or regenerate tissue.
This article was originally published by Yale University.
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