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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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Color Vision01:24

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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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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The Retina01:32

The Retina

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The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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Autophagy supports color vision.

Zhenqing Zhou1, Frans Vinberg1, Frank Schottler1

  • 1a Department of Ophthalmology and Visual Sciences, Washington University in St. Louis; School of Medicine ; St. Louis , MO USA.

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Macroautophagy supports cone function and survival in the retina, especially during starvation and light stress. This process is crucial for maintaining vision and may offer therapeutic targets for retinal degenerative diseases.

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Area of Science:

  • Ophthalmology
  • Cell Biology
  • Neuroscience

Background:

  • Cones are essential for color vision but vulnerable in retinal diseases.
  • Cone energy demands are high, yet supporting mechanisms are unclear.
  • Macroautophagy may sustain cones under stress.

Purpose of the Study:

  • Investigate macroautophagy's role in cone integrity, survival, and function.
  • Examine how blocking macroautophagy affects cones under stress.

Main Methods:

  • Studied macroautophagy in cones under normal and fasting conditions.
  • Utilized Atg5 gene deletion to inhibit macroautophagy in cones.
  • Assessed cone function, structure, and survival following starvation and light exposure.

Main Results:

  • Macroautophagy is induced in cones by fasting, indicated by AMPK phosphorylation.
  • Inhibiting macroautophagy (Atg5-deficiency) impaired cone function after starvation.
  • Atg5-deficiency increased susceptibility to light damage, causing mitochondrial buildup and cone degeneration.

Conclusions:

  • Macroautophagy is vital for cone metabolic needs and stress resistance.
  • Mitophagy plays a key role in supporting cone metabolic demands.
  • Targeting macroautophagy could preserve vision in retinal diseases.