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Electrophysiological Methods for Measuring Photopigment Levels in Drosophila Photoreceptors
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Human photoreceptor outer segments shorten during light adaptation.

Michael D Abràmoff1, Robert F Mullins, Kyungmoo Lee

  • 1Institute for Vision Research, University of Iowa, Iowa City, IA 52242, USA.

Investigative Ophthalmology & Visual Science
|May 2, 2013
PubMed
Summary

In Best disease, outer segments (OS) lengthen during light adaptation, unlike in healthy eyes where they shorten. This anatomical change correlates with the electro-oculographic (EOG) response, suggesting a role for Bestrophin-1 in retinal adaptation.

Keywords:
Best diseaseOCTeletro-oculogramphotoreceptor cells

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Area of Science:

  • Ophthalmology
  • Retinal Biology
  • Genetic Eye Diseases

Background:

  • Best disease is an inherited macular dystrophy caused by mutations in the BEST1 gene.
  • Patients with Best disease show reduced electro-oculographic (EOG) responses and abnormally long outer segments (OS) compared to controls.
  • Understanding the dynamic changes in retinal anatomy during light and dark adaptation is crucial for comprehending visual function and disease mechanisms.

Purpose of the Study:

  • To investigate anatomical changes in the outer retina during dark and light adaptation in individuals with and without Best disease.
  • To compare these anatomical changes with electro-oculographic (EOG) measurements.
  • To elucidate the functional role of Bestrophin-1 in retinal adaptation.

Main Methods:

  • Spectral domain optical coherence tomography (SD-OCT) was used to image the retinas of unaffected (n=11) and Best disease (n=7) subjects over a 40-minute dark-light cycle.
  • Automated 3-D segmentation quantified changes in retinal layer distances.
  • Electro-oculography (EOG) was performed on two subjects under identical conditions.

Main Results:

  • In healthy subjects, outer segment equivalent length (OSEL) significantly decreased by -2.14 μm during light adaptation.
  • Best disease subjects exhibited a significant OSEL increase of 2.07 μm during light adaptation.
  • The temporal pattern of OS length changes closely matched the EOG waveform.

Conclusions:

  • The light peak of the EOG in normal subjects is linked to decreased OSEL.
  • The absence of a light peak in Best disease correlates with increased OSEL.
  • Bestrophin-1 may facilitate RPE-photoreceptor interaction for phagocytosis by modulating the standing potential and OS length.