Pigment patterns in adult fish result from superimposition of two largely independent pigmentation mechanisms

Rosa M. Ceinos, Raul Guillot, Robert N. Kelsh, Jose M. Cerda-Reverter, Josep Rotllant

OAI: oai:purehost.bath.ac.uk:publications/94376910-f19b-4bd8-af8d-7e1a3b69f593 • DOI: https://doi.org/10.1111/pcmr.12335

Dorso-ventral pigment pattern differences are the most widespread pigmentary adaptations in vertebrates. In mammals, this pattern is controlled by regulating melanin chemistry in melanocytes using a protein, agouti-signalling peptide (ASIP). In fish, studies of pigment patterning have focused on stripe formation, identifying a core striping mechanism dependent upon interactions between different pigment cell types. In contrast, mechanisms driving the dorso-ventral countershading pattern have been overlooked. Here, we demonstrate that, in fact, zebrafish utilize two distinct adult pigment patterning mechanisms – an ancient dorso-ventral patterning mechanism, and a more recent striping mechanism based on cell–cell interactions; remarkably, the dorso-ventral patterning mechanism also utilizes ASIP. These two mechanisms function largely independently, with resultant patterns superimposed to give the full pattern.