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Related Concept Videos

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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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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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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Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
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Color Vision01:24

Color Vision

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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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Vision01:24

Vision

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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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Related Experiment Video

Updated: Sep 26, 2025

Transretinal ERG Recordings from Mouse Retina: Rod and Cone Photoresponses
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Transretinal ERG Recordings from Mouse Retina: Rod and Cone Photoresponses

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Cone-Driven Retinal Responses Are Shaped by Rod But Not Cone HCN1.

Colten K Lankford1, Yumiko Umino2, Deepak Poria3

  • 1Department of Biochemistry and Molecular Biology, University of Iowa, Iowa City, Iowa 52242.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|April 19, 2022
PubMed
Summary

Hyperpolarization-activated cyclic nucleotide-gated 1 (HCN1) channels in retinal rods are crucial for vision. Removing HCN1 from rods disrupts normal signaling, suppressing cone function, while its removal from cones has no effect.

Keywords:
ERGHCN1conelight adaptationphotovoltagerod

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Area of Science:

  • Neuroscience
  • Retinal Physiology
  • Photoreceptor Signaling

Background:

  • Signal integration in neural circuits, particularly in the retina, is vital for vision but poorly understood.
  • The hyperpolarization-activated current (Ih), mediated by HCN1 channels, plays a role in modulating photoreceptor responses.
  • The specific roles of HCN1 in rod and cone signaling and their integration remain understudied.

Purpose of the Study:

  • To investigate the function of HCN1 channels in mouse rod and cone photoreceptors.
  • To elucidate the role of HCN1 in mediating the integration of rod and cone signals in the retina.
  • To understand how HCN1 influences visual signaling across different light intensities.

Main Methods:

  • Utilized conditional knock-out (KO) mouse models to specifically remove HCN1 from rods or cones.
  • Employed electroretinography (ERG) to assess retinal signaling responses.
  • Evaluated behavioral responses to light modulation to understand functional consequences.

Main Results:

  • Conditional KO of HCN1 in rods resulted in prolonged rod responses in dim light and suppressed cone signaling in brighter light.
  • Altering rod signaling with HCN1 KO impacted retinal signaling and behavior.
  • Conditional KO of HCN1 in cones showed no significant effect on cone-mediated signaling.

Conclusions:

  • HCN1 in rods is essential for normal retinal function and the integration of rod-cone signals.
  • HCN1 appears dispensable in cones, possibly due to inherent temporal control mechanisms in cone phototransduction.
  • HCN1's primary role in cone-driven signaling may be indirect, by regulating rod output and preventing their over-activation.