期刊
JOURNAL OF COMPARATIVE NEUROLOGY
卷 529, 期 9, 页码 2265-2282出版社
WILEY
DOI: 10.1002/cne.25092
关键词
color vision; Geotria australis; lamprey; opsin; photoreceptor; RRID:SCR_000432; RRID: SCR_001622; RRID:SCR_002526; RRID:SCR_003070; RRID:SCR_007361; RRID:SCR_017277
资金
- University of Western Australia
- West Australian Premiers Fellowship
- ARC Future Fellowships [FT110100528, FT110100176]
- Australian Research Council (ARC) [DP140102117, DP110103294, DP120102327]
- Scholarship for International Research Fees
- Australian Research Council [FT110100528] Funding Source: Australian Research Council
The study found that the retina of the southern hemisphere pouched lamprey possesses five spectrally and morphologically distinct photoreceptors, indicating potential for complex color vision. Each photoreceptor subtype has a specific spatial distribution in the retina, possibly associated with changes in spectral radiance across different lines of sight.
Lampreys are extant members of the agnathan (jawless) vertebrates that diverged similar to 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.
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