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    Function and Evolutionary Origin of Unicellular Camera-Type Eye Structure

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    Type
    Article
    Authors
    Hayakawa, Shiho
    Takaku, Yasuharu
    Hwang, Jung Shan
    Horiguchi, Takeo
    Suga, Hiroshi
    Gehring, Walter
    Ikeo, Kazuho
    Gojobori, Takashi cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Bioscience Program
    Computational Bioscience Research Center (CBRC)
    Date
    2015-03-03
    Permanent link to this record
    http://hdl.handle.net/10754/346677
    
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    Abstract
    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 ONE
    Publisher
    Public Library of Science (PLoS)
    Journal
    PLoS ONE
    DOI
    10.1371/journal.pone.0118415
    PubMed ID
    25734540
    PubMed Central ID
    PMC4348419
    Additional Links
    http://dx.plos.org/10.1371/journal.pone.0118415
    ae974a485f413a2113503eed53cd6c53
    10.1371/journal.pone.0118415
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Bioscience Program; Computational Bioscience Research Center (CBRC)

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