scholarly journals Decision letter: The visual pigment xenopsin is widespread in protostome eyes and impacts the view on eye evolution

2020 ◽  
Keyword(s):  
Visual Pigment ◽  
Eye Evolution

scholarly journals Author response: The visual pigment xenopsin is widespread in protostome eyes and impacts the view on eye evolution

2020 ◽  
Author(s):  
Clemens Christoph Döring ◽  
Suman Kumar ◽  
Sharat Chandra Tumu ◽  
Ioannis Kourtesis ◽  
Harald Hausen
Keyword(s):  
Visual Pigment ◽  
Author Response ◽  
Eye Evolution

scholarly journals The visual pigment xenopsin is widespread in protostome eyes and impacts the view on eye evolution

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Clemens Christoph Döring ◽  
Suman Kumar ◽  
Sharat Chandra Tumu ◽  
Ioannis Kourtesis ◽  
Harald Hausen
Keyword(s):  
Visual Pigment ◽  
Photoreceptor Cells ◽  
Complex Situation ◽  
Eye Evolution ◽  
Molecular Components ◽  
Existing Data

Photoreceptor cells in the eyes of Bilateria are often classified into microvillar cells with rhabdomeric opsin and ciliary cells with ciliary opsin, each type having specialized molecular components and physiology. First data on the recently discovered xenopsin point towards a more complex situation in protostomes. In this study, we provide clear evidence that xenopsin enters cilia in the eye of the larval bryozoan Tricellaria inopinata and triggers phototaxis. As reported from a mollusc, we find xenopsin coexpressed with rhabdomeric-opsin in eye photoreceptor cells bearing both microvilli and cilia in larva of the annelid Malacoceros fuliginosus. This is the first organism known to have both xenopsin and ciliary opsin, showing that these opsins are not necessarily mutually exclusive. Compiling existing data, we propose that xenopsin may play an important role in many protostome eyes and provides new insights into the function, evolution, and possible plasticity of animal eye photoreceptor cells.

Opsin gene sequence variation across phylogenetic and population histories inMysis(Crustacea: Mysida) does not match current light environments or visual-pigment absorbance spectra

2012 ◽  
Vol 21 (9) ◽  
pp. 2176-2196 ◽  
Author(s):  
ASTA AUDZIJONYTE ◽  
JOHAN PAHLBERG ◽  
MARTTA VILJANEN ◽  
KRISTIAN DONNER ◽  
RISTO VÄINÖLÄ
Keyword(s):  
Visual Pigment ◽  
Sequence Variation ◽  
Gene Sequence ◽  
Opsin Gene ◽  
Absorbance Spectra

First identification and localization of a visual pigment in Hydra (Cnidaria, Hydrozoa)

2001 ◽  
Vol 187 (1) ◽  
pp. 79-81 ◽  
Author(s):  
C. Musio ◽  
S. Santillo ◽  
C. Taddei-Ferretti ◽  
L.J. Robles ◽  
R. Vismara ◽  
...  
Keyword(s):  
Visual Pigment

Insights from a lost visual pigment

1997 ◽  
Vol 15 (2) ◽  
pp. 115-117 ◽  
Author(s):  
Gabriel H. Travis
Keyword(s):  
Visual Pigment

scholarly journals Direct Action of Light in Naturally Pigmented Muscle Fibers

1962 ◽  
Vol 46 (2) ◽  
pp. 333-342 ◽  
Author(s):  
Howard H. Seliger
Keyword(s):  
Visual Pigment ◽  
Absorption Maximum ◽  
Pupil Diameter ◽  
Direct Action ◽  
Pigment Epithelium ◽  
Action Spectrum ◽  
Square Root ◽  
Light Reaction ◽  
First Order ◽  
Iris Sphincter

Contraction due to light in excised eel irises appears to follow a simple first order law. The action spectrum for contraction has a maximum which agrees with the eel rhodopsin absorption maximum. Inasmuch as rhodopsin is the rod pigment-opsin complex and the iris sphincter pupillae evolves from the pigment epithelium of the retina in the region of the iris, the muscle pigment might be the same as the visual pigment. In the human eye the contraction of the iris sphincter is activated only by light incident on the retina and the pupil diameter varies inversely with the square root of the light intensity. The inverse first power relation observed in the present experiments suggests a more primitive origin for the light reaction in eel irises. Relaxation is a much slower process and can be approximated as the sum of two first order processes.

scholarly journals Mutually exclusive expression of human red and green visual pigment-reporter transgenes occurs at high frequency in murine cone photoreceptors

1999 ◽  
Vol 96 (9) ◽  
pp. 5251-5256 ◽  
Author(s):  
Y. Wang ◽  
P. M. Smallwood ◽  
M. Cowan ◽  
D. Blesh ◽  
A. Lawler ◽  
...  
Keyword(s):  
High Frequency ◽  
Visual Pigment ◽  
Cone Photoreceptors
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