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Endogenous Opsin 3 (OPN3) Protein Expression in the Adult Brain Using a Novel OPN3-mCherry Knock-In Mouse Model.

eNeuro. 2020 Sep 03;7(5)
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摘要


The opsins have been studied extensively for their functions in visual phototransduction; however, the mechanisms underlying extraocular opsin signaling remain poorly understood. The first mammalian extraocular opsin to be discovered, opsin 3 (OPN3), was found in the brain more than two decades ago, yet its function remains unknown. A significant hindrance to studying OPN3 has been a lack of specific antibodies against mammalian OPN3, resulting in an incomplete understanding of its expression in the brain. Although Opn3 promoter-driven reporter mice have been generated to examine general OPN3 localization, they lack the regulated expression of the endogenous protein and the ability to study its subcellular localization. To circumvent these issues, we have created a knock-in OPN3-mCherry mouse model in which the fusion protein OPN3-mCherry is expressed under the endogenous Opn3 promoter. Viable and fertile homozygotes for the OPN3-mCherry allele were used to create an extensive map of OPN3-mCherry expression across the adult mouse brain. OPN3-mCherry was readily visualized in distinct layers of the cerebral cortex (CTX), the hippocampal formation (HCF), distinct nuclei of the thalamus, as well as many other regions in both neuronal and non-neuronal cells. Our mouse model offers a new platform to investigate the function of OPN3 in the brain.

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