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AGE: 8–14 The skin is a touch-sensing organ that grows and thickens from birth to adulthood. The touch-sensing cells of the nervous system interact with skin cells and must remodel to accommodate skin growth. In adult animals, the skin also develops specialized structures, like scales in fish and hair in mammals. We studied how changes in the skin and touch-sensing nervous system are controlled, using fish as a model. We found that, in fish mutants with no scales, the outer skin fails to mature and the adult touch-sensing nervous system does not fully develop. As a result, fish without scales are likely less sensitive to touch. These results show that scales instruct cells in the skin and nervous system to transform into adult forms. Our findings in fish raise the possibility that other structures, like hair in mammals, play similar roles in maturing the skin of other animals.

Teenage Mutant Zebrafish: Scales Transform the Skin as Fish Grow Into Adulthood