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PubMed · 15459395

Nonvisual photoreception in the chick iris.

Daniel C Tu·Matthew L Batten·Krzysztof Palczewski·Russell N Van Gelder
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Abstract

The embryonic chicken iris constricts to light ex vivo, but with characteristics atypical of visual phototransduction. The chick iris was most sensitive to short-wavelength light, demonstrating an action spectrum consistent with cryptochrome rather than with opsin pigments. Pupillary responses did not attenuate after saturating light exposure, but showed paradoxical potentiation. Iris photosensitivity was not affected by retinoid depletion or inhibitors of visual phototransduction. Knockdown of cryptochrome expression, but not of melanopsin expression, decreased iris photosensitivity. These data characterize a non-opsin photoreception mechanism in a vertebrate eye and suggest a conserved photoreceptive role for cryptochromes in vertebrates.

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AnimalsChick EmbryoCryptochromesFlavoproteinsIrisLightLight Signal TransductionRNA, Small InterferingReflex, PupillaryRetinoidsRod OpsinsUltraviolet RaysMelanopsinJournal ArticleResearch Support, Non-U.S. Gov'tResearch Support, U.S. Gov't, P.H.S.

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Daniel C Tu, Matthew L Batten, Krzysztof Palczewski, Russell N Van Gelder. 2004-10-01. Nonvisual photoreception in the chick iris.. https://doi.org/10.1126/science.1101484

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