The adult cone

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MiR-211 is essential for adult cone photoreceptor maintenance and visual function

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Thyroid Hormone Controls Cone Opsin Expression in the Retina of Adult Rodents

Mammalian retinas display an astonishing diversity in the spatial arrangement of their spectral cone photoreceptors, probably in adaptation to different visual environments. Opsin expression patterns like the dorsoventral gradients of short-wave-sensitive S and middle- to long-wave-sensitive M cone opsin found in many species are established early in development and thought to be stable thereafter throughout life. However, the role of TH in the maintenance of the mature cone photoreceptor pattern is unclear. We here show that TH also controls adult cone opsin expression. Methimazole-induced suppression of serum TH in adult mice and rats yielded no changes in cone numbers but reversibly altered cone patterns by activating the expression of S-cone opsin and repressing the expression of M-cone opsin.
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Thyroid Hormone Controls Cone Opsin Expression in the Retina of Adult Rodents

Purpose : After terminal differentiation most neurons persist and maintain their function throughout the lifetime. We were interested to study whether epigenetic factors such as microRNAs were involved in maintaining the function and genetic identity of terminally differentiated cone photoreceptors in adult mouse retinas. Methods : We disrupted the microRNA machinery by depleting the epigenetic factor DiGeorge syndrome critical region gene 8 DGCR8 specifically in differentiated mouse cone photoreceptors.
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