Expression of pineal ultraviolet- and green-like opsins in the pineal organ and retina of teleosts
In teleostean bony fishes, studies on the adults of various species have shown that pineal photoreceptors are maximally sensitive to short- and middle-wavelength light, possibly utilising both rod-like and pineal-specific opsins. Until recently, however, very little was known about the pineal opsins...
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fthighwire:oai:open-archive.highwire.org:jexbio:204/14/2517 2023-05-15T15:31:55+02:00 Expression of pineal ultraviolet- and green-like opsins in the pineal organ and retina of teleosts Forsell, Johan Ekström, Peter Flamarique, Iñigo Novales Holmqvist, Bo 2001-07-15 00:00:00.0 text/html http://jeb.biologists.org/cgi/content/short/204/14/2517 en eng Company of Biologists http://jeb.biologists.org/cgi/content/short/204/14/2517 Copyright (C) 2001, Company of Biologists Reviews TEXT 2001 fthighwire 2013-05-27T04:29:52Z In teleostean bony fishes, studies on the adults of various species have shown that pineal photoreceptors are maximally sensitive to short- and middle-wavelength light, possibly utilising both rod-like and pineal-specific opsins. Until recently, however, very little was known about the pineal opsins present in embryonic and larval teleosts and their relationships to opsins expressed by retinal photoreceptors. Our immunocytochemical studies have revealed that, in Atlantic halibut, herring and cod, pineal photoreceptors express principal phototransduction molecules during embryonic life before they appear in retinal photoreceptors. In cDNA from embryonic and adult halibut, we identified two partial opsin gene sequences, HPO1 and HPO4, with highest homology to teleost green and ultraviolet cone opsins (72–83% and 71–83% amino acid identity, respectively). In halibut, these opsins are expressed in the pineal organ of embryos and appear in the retina of larvae. Our recent in situ hybridisation studies with RNA probes for HPO1 and HPO4 demonstrate the presence of green-like opsin mRNAs in the pineal organ and the retina of herring, cod, turbot, haddock, Atlantic salmon, zebrafish and three species of cichlid, and of ultraviolet opsins in the retinas of zebrafish, Atlantic salmon, turbot and the three cichlid species. We conclude that the halibut pineal organ appears to have the potential for both ultraviolet and green photosensitivity from the embryonic stage and that the retina may acquire the same potential during the larval stages. In the other teleosts studied, although both pineal and retinal photoreceptors seem to utilise a green-like opsin from the larval stage, ultraviolet photoreception appears to be restricted to the retina. Text Atlantic salmon Turbot HighWire Press (Stanford University) |
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Reviews Forsell, Johan Ekström, Peter Flamarique, Iñigo Novales Holmqvist, Bo Expression of pineal ultraviolet- and green-like opsins in the pineal organ and retina of teleosts |
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Reviews |
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In teleostean bony fishes, studies on the adults of various species have shown that pineal photoreceptors are maximally sensitive to short- and middle-wavelength light, possibly utilising both rod-like and pineal-specific opsins. Until recently, however, very little was known about the pineal opsins present in embryonic and larval teleosts and their relationships to opsins expressed by retinal photoreceptors. Our immunocytochemical studies have revealed that, in Atlantic halibut, herring and cod, pineal photoreceptors express principal phototransduction molecules during embryonic life before they appear in retinal photoreceptors. In cDNA from embryonic and adult halibut, we identified two partial opsin gene sequences, HPO1 and HPO4, with highest homology to teleost green and ultraviolet cone opsins (72–83% and 71–83% amino acid identity, respectively). In halibut, these opsins are expressed in the pineal organ of embryos and appear in the retina of larvae. Our recent in situ hybridisation studies with RNA probes for HPO1 and HPO4 demonstrate the presence of green-like opsin mRNAs in the pineal organ and the retina of herring, cod, turbot, haddock, Atlantic salmon, zebrafish and three species of cichlid, and of ultraviolet opsins in the retinas of zebrafish, Atlantic salmon, turbot and the three cichlid species. We conclude that the halibut pineal organ appears to have the potential for both ultraviolet and green photosensitivity from the embryonic stage and that the retina may acquire the same potential during the larval stages. In the other teleosts studied, although both pineal and retinal photoreceptors seem to utilise a green-like opsin from the larval stage, ultraviolet photoreception appears to be restricted to the retina. |
format |
Text |
author |
Forsell, Johan Ekström, Peter Flamarique, Iñigo Novales Holmqvist, Bo |
author_facet |
Forsell, Johan Ekström, Peter Flamarique, Iñigo Novales Holmqvist, Bo |
author_sort |
Forsell, Johan |
title |
Expression of pineal ultraviolet- and green-like opsins in the pineal organ and retina of teleosts |
title_short |
Expression of pineal ultraviolet- and green-like opsins in the pineal organ and retina of teleosts |
title_full |
Expression of pineal ultraviolet- and green-like opsins in the pineal organ and retina of teleosts |
title_fullStr |
Expression of pineal ultraviolet- and green-like opsins in the pineal organ and retina of teleosts |
title_full_unstemmed |
Expression of pineal ultraviolet- and green-like opsins in the pineal organ and retina of teleosts |
title_sort |
expression of pineal ultraviolet- and green-like opsins in the pineal organ and retina of teleosts |
publisher |
Company of Biologists |
publishDate |
2001 |
url |
http://jeb.biologists.org/cgi/content/short/204/14/2517 |
genre |
Atlantic salmon Turbot |
genre_facet |
Atlantic salmon Turbot |
op_relation |
http://jeb.biologists.org/cgi/content/short/204/14/2517 |
op_rights |
Copyright (C) 2001, Company of Biologists |
_version_ |
1766362413121142784 |