PUBLICATION

The Dual Functional Reflecting Iris of the Zebrafish

Authors
Gur, D., Nicolas, J.D., Brumfeld, V., Bar-Elli, O., Oron, D., Levkowitz, G.
ID
ZDB-PUB-180822-3
Date
2018
Source
Advanced science (Weinheim, Baden-Wurttemberg, Germany)   5: 1800338 (Journal)
Registered Authors
Gur, Dvir, Levkowitz, Gil
Keywords
biomineralization, guanine crystals, iridophores, photonic crystals, vision, zebrafish development
MeSH Terms
none
PubMed
30128243 Full text @ Adv Sci (Weinh)
Abstract
Many marine organisms have evolved a reflective iris to prevent unfocused light from reaching the retina. The fish iris has a dual function, both to camouflage the eye and serving as a light barrier. Yet, the physical mechanism that enables this dual functionality and the benefits of using a reflective iris have remained unclear. Using synchrotron microfocused diffraction, cryo-scanning electron microscopy imaging, and optical analyses on zebrafish at different stages of development, it is shown that the complex optical response of the iris is facilitated by the development of high-order organization of multilayered guanine-based crystal reflectors and pigments. It is further demonstrated how the efficient light reflector is established during development to allow the optical functionality of the eye, already at early developmental stages.
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Human Disease / Model Data
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Errata and Notes