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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Photoreceptors at a glance.

Robert S Molday1, Orson L Moritz2

  • 1Department of Biochemistry and Molecular Biology, Centre for Macular Research, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z3 Department of Ophthalmology and Visual Sciences, Centre for Macular Research, University of British Columbia, Vancouver, British Columbia, Canada V5Z 3N9 molday@interchange.ubc.ca.

Journal of Cell Science
|November 18, 2015
PubMed
Summary

Photoreceptor cells capture light via phototransduction in their outer segments (OS). This study reviews OS renewal, protein trafficking, and related retinal degenerative diseases.

Keywords:
Disk morphogenesisPhotoreceptorsPhototransductionProtein traffickingRetinal degenerative diseasesVisual cycle

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Area of Science:

  • Cell biology
  • Neuroscience
  • Biochemistry

Background:

  • Retinal photoreceptor cells possess specialized outer segments (OS) crucial for light detection and signal transduction.
  • Phototransduction involves light capture, biochemical cascades, and cellular responses, including cGMP-gated channel closure and hyperpolarization.
  • The visual cycle regenerates retinal for rhodopsin, while OS undergo continuous renewal via phagocytosis and disk morphogenesis linked to protein trafficking.

Purpose of the Study:

  • To summarize current knowledge on photoreceptor cell biology.
  • To elucidate the processes of phototransduction, the visual cycle, and OS renewal.
  • To highlight protein trafficking mechanisms and their connection to retinal degenerative diseases.

Main Methods:

  • Review of existing literature on photoreceptor structure and function.
  • Analysis of proposed models for OS disk morphogenesis.
  • Investigation of molecular mechanisms in protein trafficking.

Main Results:

  • Detailed overview of the structure and function of retinal photoreceptor OS.
  • Explanation of the phototransduction cascade and the visual cycle.
  • Discussion of OS renewal processes, including disk morphogenesis and protein trafficking.

Conclusions:

  • Understanding photoreceptor OS renewal and protein trafficking is essential for comprehending retinal function.
  • Defects in these processes may contribute to the pathogenesis of retinal degenerative diseases.
  • This review provides a foundation for further research into photoreceptor maintenance and disease.