Journal
JOURNAL OF NEUROSCIENCE
Volume 34, Issue 34, Pages 11212-11221Publisher
SOC NEUROSCIENCE
DOI: 10.1523/JNEUROSCI.1245-14.2014
Keywords
dark adaptation; photoreceptors; pigment regeneration; retina; retinol dehydrogenase; visual cycle
Categories
Funding
- National Institutes of Health (NIH) [EY019312, EY021126, EY18826, HG006790, HG006346, EY01157, EY002687]
- Prevent Blindness Career Development Award
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Efficient regeneration of visual pigment following its destruction by light is critical for the function of mammalian photoreceptors. Here, we show that misexpression of a subset of cone genes in the rd7 mouse hybrid rods enables them to access the normally cone-specific retina visual cycle. The rapid supply of chromophore by the retina visual cycle dramatically accelerated the mouse rod dark adaptation. At the same time, the competition between rods and cones for retina-derived chromophore slowed cone dark adaptation, indicating that the cone specificity of the retina visual cycle is key for rapid cone dark adaptation. Our findings demonstrate that mammalian photoreceptor dark adaptation is dominated by the supply of chromophore. Misexpression of cone genes in rods may represent a novel approach to treating visual disorders associated with mutations of visual cycle proteins or with reduced retinal pigment epithelium function due to aging.
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