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Related Experiment Video

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Detecting Abnormalities in Choroidal Vasculature in a Mouse Model of Age-related Macular Degeneration by Time-course Indocyanine Green Angiography
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Central areolar choroidal dystrophy.

Camiel J F Boon1, B Jeroen Klevering, Frans P M Cremers

  • 1Department of Ophthalmology, Radboud University Nijmegen Medical Centre, Nijmegen, the Netherlands.

Ophthalmology
|February 27, 2009
PubMed
Summary
This summary is machine-generated.

Central areolar choroidal dystrophy (CACD) is a cone dystrophy often caused by a peripherin/RDS mutation. This condition shows variable severity and nonpenetrance, and can mimic age-related macular degeneration (AMD).

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Area of Science:

  • Ophthalmology
  • Medical Genetics
  • Retinal Dystrophies

Background:

  • Central areolar choroidal dystrophy (CACD) is a rare inherited retinal disorder.
  • Understanding its clinical spectrum and genetic underpinnings is crucial for diagnosis and management.
  • Previous studies have suggested a genetic basis, but large-scale characterization is limited.

Purpose of the Study:

  • To delineate the clinical characteristics of CACD.
  • To analyze follow-up data and identify the molecular genetic basis in a large patient cohort.
  • To investigate the phenotypic variability and penetrance of CACD mutations.

Main Methods:

  • Retrospective case series study of 103 patients with CACD from the Netherlands.
  • Comprehensive ophthalmologic examinations including fundus photography, angiography, autofluorescence, OCT, and electrophysiology.
  • Genetic analysis of the peripherin/RDS gene and haplotype analysis to identify mutations and founder effects.

Main Results:

  • The p.Arg142Trp mutation in the peripherin/RDS gene was identified in 98 patients, with a likely common founder mutation in the Netherlands.
  • A significant variation in disease severity and up to 21% nonpenetrance was observed.
  • Clinical findings were consistent with central cone dystrophy, showing overlap with age-related macular degeneration (AMD), especially in milder or nonpenetrant cases.

Conclusions:

  • CACD caused by the p.Arg142Trp mutation presents as a central cone dystrophy with considerable nonpenetrance.
  • The high prevalence of this mutation in a specific region suggests a common founder.
  • Distinguishing CACD from AMD is important in elderly patients, particularly when penetrance is reduced.