Eye-like ocelloids are built from different endosymbiotically acquired components

@article{Gavelis2015EyelikeOA,
  title={Eye-like ocelloids are built from different endosymbiotically acquired components},
  author={Gregory S. Gavelis and Shiho Hayakawa and Richard Allen White and Takashi Gojobori and C. Suttle and Patrick J. Keeling and Brian S. Leander},
  journal={Nature},
  year={2015},
  volume={523},
  pages={204-207}
}
Multicellularity is often considered a prerequisite for morphological complexity, as seen in the camera-type eyes found in several groups of animals. [...] Key Result We find that the retinal body forms the central core of a network of peridinin-type plastids, which in dinoflagellates and their relatives originated through an ancient endosymbiosis with a red alga. As such, the ocelloid is a chimaeric structure, incorporating organelles with different endosymbiotic histories. The anatomical complexity of single…Expand
Protistology: How to build a microbial eye
TLDR
The evolutionary origin of ocelloids is investigated using a single-organelle genomics approach in Erythropsidinium sp. Expand
Orient in the World with a Single Eye: The Green Algal Eyespot and Phototaxis
TLDR
This work addresses emerging novel insights in the homeostatic feedback regulation of phototactic sensitivity by the cells’ physiological activities and summarizes recent progress in the diverse eyespot-related areas. Expand
Seeing the Light through Borrowed Lenses
TLDR
Brian Leander and colleagues tackled the origins of this cytoplasmic ‘‘eye’’ of dinoflagellates, demonstrating that the ocelloid structure arises from an unpreceded degree of cooperation among organelles. Expand
Carotenoids in the eyespot apparatus are required for triggering phototaxis in Euglena gracilis
TLDR
It is revealed that carotenoids are essential for light perception by the EA for the initiation of phototactic movement by E. gracilis, suggesting one possible photosensory role of carotanoids in theEA for the phototaxis. Expand
Dinoflagellate nucleus contains an extensive endomembrane network, the nuclear net
TLDR
The nuclear architecture of Polykrikos kofoidii is reconstructed in 3D using focused ion beam scanning electron microscopy (FIB-SEM) in conjunction with high-pressure freezing, freeze-substitution, TEM, and confocal microscopy to show that nuclear complexity has been underestimated and, potentially, in other dinoflagellates. Expand
Plastid-associated galactolipid composition in eyespot-containing dinoflagellates: a review
Relative to the large number of photosynthetic dinoflagellate species, only a select few possess proteinaceous, carotenoid-rich eyespots which have been demonstrated in other algae to act inExpand
Proteomic Analysis of a Fraction with Intact Eyespots of Chlamydomonas reinhardtii and Assignment of Protein Methylation
TLDR
A purification procedure that allows isolation of intact eyespots is presented and several proteins from eyespot fractions that are methylated at Arg and/or Lys are identified, among them is the eyespot specific SOUL3 protein that influences the size and position of the eyespots and EYE2, a protein important for its development. Expand
Plastid Complexity in Dinoflagellates: A Picture of Gains, Losses, Replacements and Revisions
TLDR
New insights into dinoflagellate plastid biology and diversity are suggested and it is suggested that it is timely to revise notions of the origin of the peridinin plastids. Expand
Eyes in the Chameleon Vine?
  • E. Gianoli
  • Biology, Medicine
  • Trends in plant science
  • 2017
TLDR
The concept of plant ocelli is resurrected, and examples of eye-like structures in cyanobacteria and dinoflagellates that allow these organisms to sense light direction and subsequently alter their movement are discussed. Expand
The function of the ocelloid and piston in the dinoflagellate Erythropsidinium (Gymnodiniales, Dinophyceae)
  • F. Gómez
  • Biology, Medicine
  • Journal of phycology
  • 2017
TLDR
This study suggests that the piston of the marine dinoflagellate Erythropsidinium is also a tactile organelle that scans the surrounding waters for prey. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 26 REFERENCES
Function and Evolutionary Origin of Unicellular Camera-Type Eye Structure
TLDR
It is suggested that the ocelloid is an intracellular camera-type eye, which might be originated from endosymbiotic origin, and is actually light sensitive photoreceptors. Expand
The functional and phylogenetic significance of dinoflagellate eyespots.
  • J. Dodge
  • Biology, Medicine
  • Bio Systems
  • 1983
TLDR
The microtubular strand is presumed to play a part in the transmission of directional stimulation from eyespot to flagellum and a hypothesis is advanced to explain how this may be brought about. Expand
Reflective properties of different eyespot types in dinoflagellates.
TLDR
Reflection signals could be followed a considerable distance into the sulcus in all cases, indicating that in dinoflagellate eyespots, back reflection of non-absorbed light can enhance the excitation probability of the photoreceptor(s). Expand
A common red algal origin of the apicomplexan, dinoflagellate, and heterokont plastids
TLDR
These findings support a relatively simple path of linear descent for the evolution of photosynthesis in a large proportion of algae and emphasize plastid loss in several lineages (e.g., ciliates, Cryptosporidium, and Phytophthora). Expand
New perspectives on eye development and the evolution of eyes and photoreceptors.
  • W. Gehring
  • Biology, Medicine
  • The Journal of heredity
  • 2005
TLDR
The demonstration that targeted expression of one and the same master control gene, that is, Pax6 can induce the formation of ectopic eyes in both insects and vertebrates necessitates a reconsideration of the dogma of a polyphyletic origin of the various eye types in all the animal phyla. Expand
The number, speed, and impact of plastid endosymbioses in eukaryotic evolution.
  • P. Keeling
  • Biology, Medicine
  • Annual review of plant biology
  • 2013
TLDR
Questions are examined about the number of endosymbiotic events needed to explain plastid diversity, whether the genetic contribution of the endOSymbionts to the host genome goes far beyond plastids-targeted genes, and whether organelle origins are best viewed as a singular transition involving one symbiont or as a gradual transition involving a long line of transient food/symbiont. Expand
Extrusive organelles in protists.
  • K. Hausmann
  • Biology, Medicine
  • International review of cytology
  • 1978
TLDR
The structural and functional diversity of extrusomes in protozoa is described, which includes structures and organelles of systematically widely differing organisms such as ejectisomes of algae and the R bodies of the bacterial symbionts of Paramecium or the toxicysts of ciliates and the nematocyst of cnidarians. Expand
Molecular phylogeny of ocelloid-bearing dinoflagellates (Warnowiaceae) as inferred from SSU and LSU rDNA sequences
TLDR
Comparative morphological data and molecular phylogenetic data demonstrate that the polykrikoid and the warnowiid clade are closely related to each other, but the precise branching order within the Gymnodinium sensu stricto clade remains unresolved. Expand
Bioluminescence in Dinoflagellates: A Test of the Burgular Alarm Hypothesis
Bioluminescence in dinoflagellates, unicellular aquatic organisms, has attracted considerable attention, primarily due to the striking nature of this phenomenon-during blooms, disturbances in theExpand
Molecular Phylogeny of the Ocelloid‐Bearing Dinoflagellates Erythropsidinium and Warnowia (Warnowiaceae, Dinophyceae)
TLDR
Phylogenetic analyses show that warnowiid dinoflagellates branch within the Gymnodinium sensu stricto group, forming a cluster separated from the Polykrikos clade and with autotrophic Pheopolykriko beauchampii as closest relative. Expand
...
1
2
3
...