Function and Evolutionary Origin of Unicellular Camera-Type Eye Structure
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Type
ArticleAuthors
Hayakawa, ShihoTakaku, Yasuharu
Hwang, Jung Shan
Horiguchi, Takeo
Suga, Hiroshi
Gehring, Walter
Ikeo, Kazuho
Gojobori, Takashi

KAUST Department
Biological and Environmental Sciences and Engineering (BESE) DivisionBioscience Program
Computational Bioscience Research Center (CBRC)
Date
2015-03-03Permanent link to this record
http://hdl.handle.net/10754/346677
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Show full item recordAbstract
The ocelloid is an extraordinary eyespot organelle found only in the dinoflagellate family Warnowiaceae. It contains retina- and lens-like structures called the retinal body and the hyalosome. The ocelloid has been an evolutionary enigma because of its remarkable resemblance to the multicellular camera-type eye. To determine if the ocelloid is functionally photoreceptive, we investigated the warnowiid dinoflagellate Erythropsidinium. Here, we show that the morphology of the retinal body changed depending on different illumination conditions and the hyalosome manifests the refractile nature. Identifying a rhodopsin gene fragment in Erythropsidinium ESTs that is expressed in the retinal body by in situ hybridization, we also show that ocelloids are actually light sensitive photoreceptors. The rhodopsin gene identified is most closely related to bacterial rhodopsins. Taken together, we suggest that the ocelloid is an intracellular camera-type eye, which might be originated from endosymbiotic origin. © 2015 Hayakawa et al.Citation
Function and Evolutionary Origin of Unicellular Camera-Type Eye Structure 2015, 10 (3):e0118415 PLOS ONEPublisher
Public Library of Science (PLoS)Journal
PLoS ONEPubMed ID
25734540PubMed Central ID
PMC4348419Additional Links
http://dx.plos.org/10.1371/journal.pone.0118415ae974a485f413a2113503eed53cd6c53
10.1371/journal.pone.0118415
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