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- W1996871192 abstract "The chick retina and pineal gland exhibit circadian oscillations in biochemical and physiological processes in vivo and in vitro, which entrain to 24-hour light-dark cycles. However, the phototransduction mechanisms responsible for entrainment are largely unknown. The present study characterizes two candidate opsinlike genes that may play a role in entrainment of the clocks in these tissues.Bioinformatics, cladistic techniques, and in situ hybridization and Northern blot analyses were conducted to characterize, localize, and determine the circadian expression of the candidate opsinlike genes in the retina and pineal gland.Two candidate photosensors and/or photoisomerases were predominantly distributed within the pineal gland and retina: the retinal pigmented epithelium-derived rhodopsin homologue (peropsin, gRrh) and retinal G-protein-coupled receptor opsin (RGR opsin, gRgr). Northern blot and in situ analyses revealed mRNA expression for both opsins in the pineal gland, retina, and brain tissue. The mRNA for both genes within the pineal gland and retina is regulated on a circadian basis such that they are highest in late subjective day. Digoxigenin in situ analyses showed retinal gRgr message within the inner nuclear layer (INL) and retinal ganglion cell layer (RGL), whereas gRrh message was distributed predominantly in the RGL. In the pineal gland, gRgr message was sparsely distributed among pinealocytes in follicles, but not within the follicles themselves, whereas gRrh was localized in interstitial areas indicative of astrocytic and/or endothelial origin.The presence of two putative photoisomerases within the pineal gland and in retinal layers associated with biological clock function provides two candidate opsinlike genes that may serve in the visual cycle regulation of the circadian clock." @default.
- W1996871192 created "2016-06-24" @default.
- W1996871192 creator A5009735497 @default.
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- W1996871192 date "2004-03-01" @default.
- W1996871192 modified "2023-10-16" @default.
- W1996871192 title "Opsin Photoisomerases in the Chick Retina and Pineal Gland: Characterization, Localization, and Circadian Regulation" @default.
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- W1996871192 doi "https://doi.org/10.1167/iovs.03-1125" @default.
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