The animal kingdom is practically dripping in mucus.
are among the more famous masters of mucus, but even the loneliest microorganism can ooze a viscous slime from time to time.
Across glands and between mammals, a small study has found many mucus genes do not in fact share a common ancestor. Even in our own species, the genes that encode for mucus proteins belong to several families. One secretes gel-forming mucus proteins, while another produces mucus proteins bound to a cell's membrane. There are also 'orphan' genes that encode for mucus production that don't quite fit anywhere else., and researchers now think they've figured out where they came from.
"I don't think it was previously known that protein function can evolve this way, from a protein gaining repeated sequences,""A protein that isn't a mucin becomes a mucin just by gaining repeats. This is an important way that evolution makes slime. It's an evolutionary trick, and we now document this happening over and over again."
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