The discovery of genetic mechanisms common to all three of these species, which diverged on the evolutionary tree about 420 million years ago, suggests that these mechanisms aren’t specific to individual species, but have been conserved by nature through evolution.
“I remember that day very well—it was a fantastic feeling,” said King of the discovery. “We didn’t expect the patterns of genetic expression to be vastly different in the three species, but it was amazing to see that they were consistently the same.”
The discovery of the common genetic regulators is expected to serve as a platform to inform new hypotheses about the genetic mechanisms underlying limb regeneration. The discovery also represents a major advance in understanding why many tissues in humans, including limb tissue, regenerate poorly—and in being able to possibly manipulate those mechanisms with drug therapies.
“Limb regeneration in humans may sound like science fiction, but it’s within the realm of possibility,” said Yin. “The fact that we’ve identified a genetic signature for limb regeneration in three different species with three different types of appendages suggests that nature has created a common genetic instruction manual governing regeneration that may be shared by all forms of animal life, including humans.”
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