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Visual opsin expression and morphological characterization of retinal photoreceptors in the pouched lamprey (Geotria australis, Gray)
Umeå University, Faculty of Medicine, Umeå Centre for Molecular Medicine (UCMM). School of Biological Sciences, The University of Western Australia, Perth, Western Australia, Australia; Oceans Institute, The University of Western Australia, Perth, Western Australia, Australia; Centre for Ophthalmology and Visual Science, Lions Eye Institute, University of Western Australia, Perth, Western Australia, Australia; School of Life Sciences, La Trobe University, Melbourne, Victoria, Australia.ORCID iD: 0000-0003-0232-1812
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2021 (English)In: Journal of Comparative Neurology, ISSN 0021-9967, E-ISSN 1096-9861, Vol. 529, no 9, p. 2265-2282Article in journal (Refereed) Published
Abstract [en]

Lampreys are extant members of the agnathan (jawless) vertebrates that diverged ~500 million years ago, during a critical stage of vertebrate evolution when image‐forming eyes first emerged. Among lamprey species assessed thus far, the retina of the southern hemisphere pouched lamprey, Geotria australis, is unique, in that it possesses morphologically distinct photoreceptors and expresses five visual photopigments. This study focused on determining the number of different photoreceptors present in the retina of G. australis and whether each cell type expresses a single opsin class. Five photoreceptor subtypes were identified based on ultrastructure and differential expression of one of each of the five different visual opsin classes (lws, sws1, sws2, rh1, and rh2) known to be expressed in the retina. This suggests, therefore, that the retina of G. australis possesses five spectrally and morphologically distinct photoreceptors, with the potential for complex color vision. Each photoreceptor subtype was shown to have a specific spatial distribution in the retina, which is potentially associated with changes in spectral radiance across different lines of sight. These results suggest that there have been strong selection pressures for G. australis to maintain broad spectral sensitivity for the brightly lit surface waters that this species inhabits during its marine phase. These findings provide important insights into the functional anatomy of the early vertebrate retina and the selection pressures that may have led to the evolution of complex color vision.

Place, publisher, year, edition, pages
John Wiley & Sons, 2021. Vol. 529, no 9, p. 2265-2282
Keywords [en]
color vision, Geotria australis, lamprey, opsin, photoreceptor
National Category
Zoology
Identifiers
URN: urn:nbn:se:umu:diva-178964DOI: 10.1002/cne.25092ISI: 000603419100001PubMedID: 33336375Scopus ID: 2-s2.0-85098280066OAI: oai:DiVA.org:umu-178964DiVA, id: diva2:1526147
Available from: 2021-02-05 Created: 2021-02-05 Last updated: 2021-07-14Bibliographically approved

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Davies, Wayne I. L.

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