The good news: They have butts. The bad news: They’re losing genes.
D. folliculorum
Face mites have lost the need for certain traits as they’ve adapted to human pores. The genes responsible, such as UV protection which is a feature that isn’t necessary if burrowed inside pores during the daytime, become obsolete and are shed from the genome as a consequence. The mites also don’t have the ability to produce
The extensive genome reduction is an indicator that the mites are in the middle of shifting their external parasitic relationship with humans to a more obligate internal symbiotic one. In this scenario, mites gradually merge with our bodies in a mutually beneficial, fully co-dependent relationship, says Perotti. For now, the mites remain on the surface as unimposing, if not helpful, residents cleaning and unclogging our pores—contrary to popular belief, Perotti says.
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