We suddenly know a whole lot more about Demodex skin mites, thanks to a newly sequenced genome.
The team’s other findings show that these mites have evolved to become incredibly lazy, genetically speaking, as a result of hitching their wagon to humans. They have a very simple genome compared to other related species, and they seem to be surviving with the bare minimum of cells and proteins needed to function .
mites as a distinct entity—a process that’s been observed with bacteria but never an animal, they say. Eventually, the mites might no longer live externally on our skin as parasites but instead become wholly internal symbiotes. If so, then we might be seeing that transition taking place now, though this transformation likely wouldn’t be finished for a long time.
Regardless of the future fate of these mites, the scientists say they’re perhaps doing some good for us now. They might help clear the skin of excess dead cells and other materials, for instance, at least when their populations are kept in check. Perotti also hopes that their research will provide people “proper knowledge of these permanent companions, which have been blamed too long for our skin problems.
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