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Direct-Coupled Electroretinogram DC-ERG for Recording the Light-Evoked Electrical Responses of the Mouse Retinal Pigment Epithelium
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Rev-Erbα modulates retinal visual processing and behavioral responses to light.

Ouafa Ait-Hmyed Hakkari1,2, Niyazi Acar3,4,5, Elise Savier1

  • 1Department of Neurobiology of Rhythms, Centre National de la Recherche Scientifique, Unités Propres de Recherche 3212, Institut des Neurosciences Cellulaires et Intégratives, Strasbourg, France.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|July 22, 2016
PubMed
Summary

The nuclear receptor REV-ERBα (NR1D1) regulates retinal light sensitivity. Mice lacking REV-ERBα show increased light sensitivity, altered retinal cell function, and behavioral changes, highlighting its role in visual processing.

Keywords:
circadian clockelectroretinogramipRGCsnegative maskingphotoreceptors

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Area of Science:

  • Ophthalmology
  • Chronobiology
  • Molecular Biology

Background:

  • The circadian clock influences retinal sensitivity to light.
  • The specific clock genes involved in this process are not well understood.
  • REV-ERBα (NR1D1) is a nuclear receptor that may play a role in retinal light adaptation.

Purpose of the Study:

  • To investigate the role of REV-ERBα in regulating retinal sensitivity to light.
  • To determine how REV-ERBα influences the function of intrinsically photosensitive retinal ganglion cells (ipRGCs).

Main Methods:

  • Behavioral tests in wild-type and Rev-Erbα knockout mice.
  • Analysis of ipRGC numbers and melanopsin expression in retinas.
  • Electrophysiological recordings (electroretinograms) and pupillometry.
  • Genetic analysis using double-null mice (Rev-Erbα and melanopsin).

Main Results:

  • Rev-Erbα knockout mice exhibited enhanced negative masking at low light levels.
  • These mice had significantly more ipRGCs and increased melanopsin staining.
  • Loss of REV-ERBα led to increased light sensitivity, evidenced by electroretinograms and pupillary response.
  • Abolished negative masking in double-null mice confirmed melanopsin's crucial role.

Conclusions:

  • REV-ERBα plays a significant role in retinal information processing and light sensitivity.
  • REV-ERBα and melanopsin likely collaborate to set the sensitivity of the rod-mediated ipRGC pathway.
  • This mechanism helps coordinate retinal activity with ambient light conditions.