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ZIRC
ZFIN ID: ZDB-PUB-180822-3
The Dual Functional Reflecting Iris of the Zebrafish
Gur, D., Nicolas, J.D., Brumfeld, V., Bar-Elli, O., Oron, D., Levkowitz, G.
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)
FIGURES
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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