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Related Concept Videos

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Related Experiment Video

Updated: Jul 2, 2026

Where You Cut Matters: A Dissection and Analysis Guide for the Spatial Orientation of the Mouse Retina from Ocular Landmarks
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Published on: August 4, 2018

Retinal pathways influence temporal niche.

Susan E Doyle1, Tomoko Yoshikawa, Holly Hillson

  • 1Department of Biology, University of Virginia, Charlottesville, VA 22904, USA. sed5c@virginia.edu

Proceedings of the National Academy of Sciences of the United States of America
|August 13, 2008
PubMed
Summary
This summary is machine-generated.

Mice lacking melanopsin (OPN4) and RPE65 showed a switch from nocturnal to diurnal activity rhythms. This reveals how retinal changes can alter circadian activity patterns and temporal niche.

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Area of Science:

  • Chronobiology
  • Neuroscience
  • Vision Science

Background:

  • Mammalian circadian rhythms are synchronized by light via the retina to the suprachiasmatic nuclei (SCN).
  • Diurnal and nocturnal species exhibit reversed activity phases, but SCN rhythm phase relative to light is constant.
  • Neural pathways downstream of the SCN are thought to dictate diurnal or nocturnal behavior.

Purpose of the Study:

  • To investigate the neural mechanisms controlling diurnal vs. nocturnal activity patterns.
  • To determine if retinal processing changes can alter circadian entrainment.
  • To identify novel pathways involved in temporal niche switching.

Main Methods:

  • Generated double-knockout mice lacking melanopsin (OPN4) and RPE65, with residual rod function.
  • Monitored circadian activity rhythms in knockout and wild-type mice under varying light conditions.
  • Analyzed SCN clock gene expression and acute masking effects of light/dark.

Main Results:

  • Rpe65(-/-);Opn4(-/-) mice exhibited a switch from nocturnal to diurnal activity entrainment.
  • This switch was associated with reversed SCN clock gene rhythms and altered light/dark masking responses.
  • Wild-type mice shifted to diurnal activity under low-intensity (scotopic) light conditions.

Conclusions:

  • Retinal input modifications, specifically involving melanopsin and RPE65, can reverse circadian activity rhythms.
  • Changes in neural responses to light upstream of the SCN mediate this nocturnal-to-diurnal switch.
  • Light intensity reduction can induce acute temporal niche switching, highlighting retinal plasticity.