2016
DOI: 10.1371/journal.pone.0163925
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Two Opsin 3-Related Proteins in the Chicken Retina and Brain: A TMT-Type Opsin 3 Is a Blue-Light Sensor in Retinal Horizontal Cells, Hypothalamus, and Cerebellum

Abstract: Opsin family genes encode G protein-coupled seven-transmembrane proteins that bind a retinaldehyde chromophore in photoreception. Here, we sought potential as yet undescribed avian retinal photoreceptors, focusing on Opsin 3 homologs in the chicken. We found two Opsin 3-related genes in the chicken genome: one corresponding to encephalopsin/panopsin (Opn3) in mammals, and the other belonging to the teleost multiple tissue opsin (TMT) 2 group. Bioluminescence imaging and G protein activation assays demonstrated… Show more

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Cited by 31 publications
(37 citation statements)
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“…However, ongoing characterization of Opn3, Opn4 and Opn5 has demonstrated expression domains outside the eye. Coupled with studies showing light-dependent signaling by these opsins (Kato et al, 2016;Kojima et al, 2011;Koyanagi et al, 2013a;Yamashita et al, 2010), this has raised the possibility of extraocular photoreception in mammals. Evidence for the function of these signals is limited to date but includes a possible role for OPN4 in acutely-regulated dilation of blood vessels (Sikka et al, 2014(Sikka et al, , 2016 and in the modulation of melanocyte pigmentation (de Assis et al, 2018;Ozdeslik et al, 2019).…”
Section: Introductionmentioning
confidence: 90%
“…However, ongoing characterization of Opn3, Opn4 and Opn5 has demonstrated expression domains outside the eye. Coupled with studies showing light-dependent signaling by these opsins (Kato et al, 2016;Kojima et al, 2011;Koyanagi et al, 2013a;Yamashita et al, 2010), this has raised the possibility of extraocular photoreception in mammals. Evidence for the function of these signals is limited to date but includes a possible role for OPN4 in acutely-regulated dilation of blood vessels (Sikka et al, 2014(Sikka et al, , 2016 and in the modulation of melanocyte pigmentation (de Assis et al, 2018;Ozdeslik et al, 2019).…”
Section: Introductionmentioning
confidence: 90%
“…w wizualizacji wzrokowej, lecz dla funkcjonowania zegara biologicznego najwi臋ksze znaczenie maj膮 barwniki niewzrokowe, zwane te偶 barwnikami chronobiologicznymi. Dotychczas w CCS ptak贸w (g艂贸wnie kury, a tak偶e przepi贸rki, go艂臋bia i wr贸bla) zlokalizowano Cry1, Cry2, Cry4, Opn3, TMT (homolog Opn3 u ryb), Opn4, Opn5, RRH, RGR oraz VA-opsyny (5,23,31,37,49,54,63,64,66,72,85). Schemat rozmieszczenia poszczeg贸lnych fotopigment贸w w CCS ptaka przedstawia tabela 1.…”
Section: Artyku艂 Przegl膮dowy Reviewunclassified
“…Przyk艂adowo, poziom mRNA mOpn4 jest wy偶szy w nocy i ni偶szy w dzie艅, za艣 mRNA RRH i RGR -wy偶szy w dzie艅, a ni偶szy w nocy, co wskazuje na ich udzia艂 w synchronizacji rytm贸w biologicznych ze 艣wiat艂em otoczenia (5,16,22,38). Wszystkie wy偶ej wymienione fotoreceptory s膮 wra偶liwe na 艣wiat艂o niebieskie, kt贸re odpowiada kolorowi nieba podczas czystego poranka i jest najlepszym sygna艂em dla organizmu o przej艣ciu nocy w dzie艅 pozwalaj膮cym zsynchronizowa膰 biologi臋 organizmu z zewn臋trznymi warunkami o艣wietlenia (52,81 (1,20,22,40,49,53,62,65,79,86). Nie wiadomo jeszcze, z jakimi bia艂kami G 艂膮cz膮 si臋 VA-opsyny, RGR oraz RRH.…”
Section: Artyku艂 Przegl膮dowy Reviewunclassified
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