Function and Evolutionary Origin of Unicellular Camera-Type Eye Structure

Hayakawa, Shiho; Takaku, Yasuharu; Hwang, Jung Shan; Horiguchi, Takeo; Suga, Hiroshi; Gehring, Walter J.; Ikeo, Kazuho; Gojobori, Takashi

doi:10.1371/journal.pone.0118415

Cited by 35 publications

(23 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A noteworthy example of complex structural morphogenesis involving symbiogenesis was recently reported in Warnowiid dinoflagellates, which are remarkable unicellular organisms possessing camera eye-like ocelloids for capturing light. 33,34 Analysis of different ocelloid components showed that the cornea was formed by mitochondria and the retina by red algae-derived plastids. 35 Apparently, this early eye-like organelle arose through sequential cell mergers and did not form "by numerous, successive, slight modifications" as Darwin postulated in Origin of Species.…”

Section: Multiple Cell Fusions In the Evolution Of Photosynthetic Eukmentioning

confidence: 99%

No genome is an island: toward a 21st century agenda for evolution

Shapiro

2019

Annals of the New York Academy of Sciences

View full text Add to dashboard Cite

Conventional 20th century evolution thinking was based on the idea of isolated genomes for each species. Any possibility of life‐history inputs to the germ line was strictly excluded by Weismann's doctrine, and genome change was attributed to random copying errors. Today, we know that many life‐history events lead to rapid and nonrandom evolutionary change mediated by specific cellular functions. There are many ways that genomes, viruses, cells, and organisms interact to generate evolutionary variation. These include cell mergers and activation of natural genetic engineering by stress, infection, and interspecific hybridization. In addition, we know molecular mechanisms for transmitting life‐history information across generations through gametes. These discoveries require a new agenda for evolutionary theory and novel experimental designs to investigate the genomic impacts of stresses, biotic interactions, and sensory inputs coming from the environment. The review will offer some generic recommendations for enriching evolution experiments to incorporate new knowledge and find answers to previously excluded questions.

show abstract

Section: Multiple Cell Fusions In the Evolution Of Photosynthetic Eukmentioning

confidence: 99%

No genome is an island: toward a 21st century agenda for evolution

Shapiro

2019

Annals of the New York Academy of Sciences

View full text Add to dashboard Cite

show abstract

“…the same way that ciliary and microvillar photoreceptor cells in animals maximize photosensitivity. This should be remedied by collecting them in the tropical pacific waters where they are most abundant [68]. This is the case in other algae with channelrhodopsins (e.g.…”

Section: Rare Dinoflagellates Sculpted Organelles Into Eyelike "Ocellmentioning

confidence: 99%

“…Hayakawa et al purportedly localized bacteriorhodopsin mRNAs to the retinal body in Erythropsidinium [68]. But these results should be taken with some caution, since rhodopsin was found to be nuclear-encoded in most if not all other eukaryotic studies (making it unlikely to reside in the retinal body plastome).…”

Section: Rare Dinoflagellates Sculpted Organelles Into Eyelike "Ocellmentioning

confidence: 99%

See 1 more Smart Citation

How exaptations facilitated photosensory evolution: Seeing the light by accident

2017

View full text Add to dashboard Cite

Exaptations are adaptations that have undergone a major change in function. By recruiting genes from sources originally unrelated to vision, exaptation has allowed for sudden and critical photosensory innovations, such as lenses, photopigments, and photoreceptors. Here we review new or neglected findings, with an emphasis on unicellular eukaryotes (protists), to illustrate how exaptation has shaped photoreception across the tree of life. Protist phylogeny attests to multiple origins of photoreception, as well as the extreme creativity of evolution. By appropriating genes and even entire organelles from foreign organisms via lateral gene transfer and endosymbiosis, protists have cobbled photoreceptors and eyespots from a diverse set of ingredients. While refinement through natural selection is paramount, exaptation helps illustrate how novelties arise in the first place, and is now shedding light on the origins of photoreception itself.

show abstract

“…Hayakawa et al. () and Gavelis et al. () carried out the immune‐cytological and genomic studies, and new TEM studies in warnowiid dinoflagellates.…”

mentioning

confidence: 99%

The function of the ocelloid and piston in the dinoflagellate Erythropsidinium (Gymnodiniales, Dinophyceae)

Gómez¹

2017

Journal of Phycology

View full text Add to dashboard Cite

The marine dinoflagellate Erythropsidinium possesses an ocelloid, the most elaborate photoreceptor organelle known in a unicellular organism, and a piston, a fast contractile appendage unknown in any other organism. The ocelloid is able to rotate, often before the cell swims. The ocelloid contains lenses that function to concentrate light. The flagellar propulsion is atrophied, and the piston is responsible for locomotion through successive extensions and contractions. During the "locomotion mode", the contraction is ~4 times faster than the extension. The piston attained up to 50 mm · s and the cell jumps backwards at -4 mm · s , while during the piston extension the cell moves forwards. The net speed of ~-1 mm · s is faster than other dinoflagellates. The piston usually moved in the "static mode" without significant cell swimming. This study suggests that the piston is also a tactile organelle that scans the surrounding waters for prey. Erythropsidinium feeds on copepod eggs by engulfing. The end of the piston possesses a "suction cup" able to attach the prey and place it into the posterior cavity for engulfing. The cylindrical shape of Erythropsidinium, and the anterior position of the ocelloid and nucleus, are morphological adaptations that leave space for the large vacuole. Observations are provided on morphological development during cell division. Most of the described species of Erythropsidinium apparently correspond to distinct life stages of known species, and the genus Greuetodinium (=Leucopsis) corresponds to an earlier division stage.

show abstract

Function and Evolutionary Origin of Unicellular Camera-Type Eye Structure

Cited by 35 publications

References 36 publications

No genome is an island: toward a 21st century agenda for evolution

No genome is an island: toward a 21st century agenda for evolution

How exaptations facilitated photosensory evolution: Seeing the light by accident

The function of the ocelloid and piston in the dinoflagellate Erythropsidinium (Gymnodiniales, Dinophyceae)

Contact Info

Product

Resources

About