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Circadian perinatal photoperiod has enduring effects on retinal dopamine and visual function.

Chad R Jackson1, Megan Capozzi, Heng Dai

  • 1Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235 and Department of Molecular Physiology and Biophysics, Vanderbilt University School of Medicine, Nashville, Tennessee 37235.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 28, 2014
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Summary

Seasonal light cycles during development impact retinal function. Winter-like light exposure caused lasting deficits in visual responses, linked to reduced retinal dopamine levels.

Keywords:
circadiandopamineelectroretinogramphotoperiodretinavision

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Ophthalmology

Background:

  • Visual system development is influenced by neural activity and light exposure.
  • Circadian rhythms and photoperiods play a role in sensory system maturation.
  • Understanding the impact of seasonal light variations on retinal function is crucial.

Purpose of the Study:

  • To investigate the effects of summer- and winter-like light cycles on retinal function during development and adulthood.
  • To assess how seasonal photoperiods influence visual behavior, retinal morphology, and gene expression.
  • To determine the role of retinal dopamine in mediating these effects.

Main Methods:

  • Mice were reared under different light/dark cycles (8:16, 16:8, 12:12 hours) simulating seasonal photoperiods.
  • Retinal light responses, visual behaviors, dopamine levels, retinal morphology, and gene expression were analyzed.
  • Dopaminergic agonist treatment was used to assess functional recovery.

Main Results:

  • Mice exposed to short, winter-like light cycles exhibited persistent deficits in photopic retinal light responses and contrast sensitivity.
  • Scotopic measures showed only transient changes under short photoperiods.
  • Reduced dopamine levels and decreased expression of tyrosine hydroxylase and Egr-1 mRNA were observed in short photoperiod retinas.
  • Dopaminergic agonist treatment restored photopic light responses.

Conclusions:

  • Seasonal light cycles during retinal development and maturation have a lasting impact on visual function.
  • Developmental programming of retinal dopamine is a likely mechanism underlying these long-term effects.
  • These findings highlight the importance of light environment during critical developmental periods for visual health.