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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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, whereas...
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In vivo Imaging of Optic Nerve Fiber Integrity by Contrast-Enhanced MRI in Mice
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Published on: July 22, 2014

M4-ipRGCs regulate contrast sensitivity in vision.

K M Daly1, Xiaoyi Li2, Shubham Rathore3

  • 1Section on Light and Circadian Rhythms (SLCR), National Institute of Mental Health, National Institutes of Health, Bethesda, MD 20892, USA; Department of Cellular, Molecular, Developmental Biology, and Biophysics, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA.

Cell Reports
|July 6, 2026
PubMed
Summary
This summary is machine-generated.

M4 intrinsically photosensitive retinal ganglion cells (ipRGCs) are crucial for visual tracking and contrast sensitivity. Targeted manipulation of M4-ipRGCs in mice reveals their specific role in visual processing.

Keywords:
CP: neuroscienceDREADDINTRSECTM4-ipRGCON sustained alpha ganglion cellintersectional geneticslow contrast visionmammalian visionmelanopsin

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Cell Biology

Background:

  • Intrinsically photosensitive retinal ganglion cells (ipRGCs) have multiple subtypes (M1-M6).
  • Understanding the specific function of each ipRGC subtype, beyond M1, is limited.
  • Molecular differences between ipRGC subtypes offer potential for targeted study.

Purpose of the Study:

  • To investigate the in-vivo function of the M4-ipRGC subtype.
  • To establish a method for studying single ipRGC subtype behavior.
  • To determine the role of M4-ipRGCs in visual perception.

Main Methods:

  • Utilized intersectional genetics for targeted in-vivo manipulation of M4-ipRGCs in mice.
  • Employed chemogenetics to activate or inhibit M4-ipRGCs.
  • Assessed behavioral and physiological responses, including contrast sensitivity and visual tracking.

Main Results:

  • M4-ipRGCs project to image-processing visual centers, avoiding the hypothalamus.
  • Chemogenetic activation of M4-ipRGCs enhanced contrast sensitivity.
  • Chemogenetic inhibition of M4-ipRGCs reduced contrast sensitivity.

Conclusions:

  • M4-ipRGCs play a significant role in modulating contrast sensitivity.
  • This study provides a robust method for dissecting the functions of individual ipRGC subtypes.
  • M4-ipRGCs are critical for visual tracking and contrast perception.