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Visual pigment composition in zebrafish: Evidence for a rhodopsin–porphyropsin interchange system

Published online by Cambridge University Press:  25 February 2005

W. TED ALLISON
Affiliation:
Department of Biology, University of Victoria, Victoria, British Columbia, Canada
THEODORE J. HAIMBERGER
Affiliation:
Department of Biology, University of Victoria, Victoria, British Columbia, Canada
CRAIG W. HAWRYSHYN
Affiliation:
Department of Biology, University of Victoria, Victoria, British Columbia, Canada
SHELBY E. TEMPLE
Affiliation:
Department of Biology, University of Victoria, Victoria, British Columbia, Canada

Abstract

Numerous reports have concluded that zebrafish (Danio rerio) possesses A1-based visual pigments in their rod and cone photoreceptors. In the present study, we investigated the possibility that zebrafish have a paired visual pigment system. We measured the spectral absorption characteristics of photoreceptors from zebrafish maintained in different temperature regimes and those treated with exogenous thyroid hormone using CCD-based microspectrophotometry. Rods from fish housed at 15°C and 28°C were not significantly different, having λmax values of 503 ± 5 nm (n = 106) and 504 ± 6 nm (n = 88), respectively. Thyroid hormone treatment (held at 28°C), however, significantly shifted the λmax of rods from 503 ± 5 nm (n = 194) to 527 ± 8 nm (n = 212). Cone photoreceptors in fish housed at 28°C (without thyroid hormone treatment) had λmax values of 361 ± 3 nm (n = 2) for ultraviolet-, 411 ± 5 nm (n = 18) for short-, 482 ± 6 nm (n = 9) for medium-, and 565 ± 10 nm (n = 14) for long-wavelength sensitive cones. Thyroid hormone treatment of fish held at 28°C significantly shifted the λmax of long-wavelength sensitive cones to 613 ± 11 nm (n = 20), substantially beyond that of the λmax of the longest possible A1-based visual pigment (∼580 nm). Thyroid hormone treatment produced smaller shifts of λmax in other cone types and increased the half-band width. All shifts in photoreceptor λmax values resulting from thyroid hormone treatment matched predictions for an A1- to A2-based visual pigment system. We therefore conclude that zebrafish possess a rhodopsin–porphyropsin interchange system that functions to spectrally tune rod and cone photoreceptors. We believe that these observations should be carefully considered during analysis of zebrafish spectral sensitivity.

Type
Research Article
Copyright
© 2004 Cambridge University Press

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