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Related Experiment Videos

Selective cone dystrophy with protan genotype

U Kellner1, B Sadowski, E Zrenner

  • 1Freie Universität Berlin, Universitätsklinikum Benjamin Franklin, Germany.

Investigative Ophthalmology & Visual Science
|November 1, 1995
PubMed
Summary
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Two male patients with progressive cone dystrophy exhibit predominant L-cone dysfunction. This may stem from hybrid L-M cone pigment genes due to X-chromosome rearrangements, impacting red cone function.

Area of Science:

  • Ophthalmology
  • Genetics
  • Vision Science

Background:

  • Cone dystrophies are a group of inherited retinal diseases affecting cone photoreceptors.
  • Progressive cone dystrophy can lead to significant vision loss, particularly in central vision.

Purpose of the Study:

  • To investigate the functional deficits in two male patients diagnosed with progressive cone dystrophy.
  • To explore the potential link between hybrid L-M cone pigment genes and the observed visual impairment.

Main Methods:

  • Clinical examinations, including visual acuity assessment.
  • Standard electroretinography (ERG) and electrooculography (EOG).
  • Chromatic electroretinography, spectral sensitivity measurements, and transient tritanopia testing.

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Main Results:

  • Patients presented with reduced visual acuity (20/50 to 20/100) and diminished ERG flicker responses.
  • Chromatic ERG revealed preserved green (M) cone responses but severely reduced red (L) cone responses.
  • Spectral sensitivity tests confirmed absent L-cone function while S- and M-cone functions were normal; abnormal transient tritanopia indicated disturbed cone-cone interactions.

Conclusions:

  • The patients exhibit progressive cone dystrophy characterized by predominant L-cone dysfunction.
  • The condition may be associated with X-chromosome pigment gene array rearrangements, leading to hybrid L-M genes and L-cone sequence deletions.
  • Protanopia as a primary condition cannot be ruled out, with cone dystrophy developing subsequently.