op·sin

(ŏp′sĭn)

Any of various light-sensitive proteins, especially one that is a constituent of a rhodopsin or other visual pigment found in the retina of the vertebrate eye.

[Probably back-formation from rhodopsin.]

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

opsin

(ˈɒpsɪn)

(Biochemistry) the protein that together with retinene makes up the purple visual pigment rhodopsin

[C20: back formation from rhodopsin]

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

op•sin

(ˈɒp sɪn)

n.

any of several compounds that form the protein component of the light-sensitive pigment rhodopsin.

[1950–55; probably back formation from rhodopsin]

ThesaurusAntonymsRelated WordsSynonymsLegend:

Noun

opsin - retinal protein formed by the action of light on rhodopsin

protein - any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes; "a diet high in protein"

iodopsin - a violet photopigment in the retinal cones of the eyes of most vertebrates; plays a role in daylight vision

retinal purple, rhodopsin, visual purple - a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light

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References in periodicals archive

Comparisons between the structures of opsin genes from Limulus (Fig.

Opsins and Their Expression Patterns in the Xiphosuran Limulus polyphemus

Summary: TEHRAN (FNA)- Researchers have found that opsin 3 -- a protein closely related to rhodopsin, the protein that enables low-light vision -- has a role in adjusting the amount of pigment produced in human skin, a determinant of skin color.

Adjusting Skin Color: Light-Sensitive Proteins

Both rods and cones contain proteins known as opsins. While cones in human eyes have three kinds of opsins (called photopsin), rods only have one opsin known as rhodopsin.

How Deep Sea Fish See In The Dark

Analysis of the genome has revealed many genes that encode proteins that would be expected to be integral to light signal transduction (Burke et al., 2006), including six opsin genes (Raible et al., 2006) and orthologs of mammalian retinal transcription factors (Agca et al., 2011).

Light-Dependent Electrical Activity in Sea Urchin Tube Feet Cells

X-linked cone dystrophy and colour vision deficiency arising from a missense mutation in a hybrid L/M cone opsin gene.

PREVALENCE OF COLOUR BLINDNESS AMONG SCHOOL CHILDREN IN MANDYA DISTRICT, KARNATAKA

Opsin genes, cone photopigments, colour vision, and colour blindness.

Identification of Novel Mutation in CNGA3 gene by Whole-Exome Sequencing and In-Silico Analyses for Genotype-Phenotype Assessment with Autosomal Recessive Achromatopsia in Pakistani families

Nathans, "Opsin genes, cone photopigments, color vision, and color blindness," in Color Vision: From Genes to Perception, K.

IMAGE RECOLORING FOR COLOR-DEFICIENT VIEWERS

In a molecular level, mature photoreceptors in human retina consist of three subtypes, rhodopsin + rods, L/M opsin + red/green cones, and S opsin + blue cones.

Generation of Retinal Organoids with Mature Rods and Cones from Urine-Derived Human Induced Pluripotent Stem Cells

This viewpoint is only now evolving with our growing understanding of mammalian circadian photoreception in the retina and the important role of melanopsin [124], which is a short-wavelength (blue) sensitive opsin expressed by a subset of retinal ganglion cells that project directly to the SCN via the RHT.

Precision Light for the Treatment of Psychiatric Disorders