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Longitudinal study of the early electroretinographic changes in Alström's syndrome
F Tremblay1, R G LaRoche, S E Shea
1Department of Ophthalmology, Dalhousie University, Halifax, Nova Scotia, Canada.
Insights
Alström syndrome causes severe early vision loss, with cone dysfunction apparent by 6 months and undetectable by one year. Rod function also rapidly declines, becoming undetectable by age 5.
Area of Science:
- Ophthalmology
- Genetics
- Clinical Medicine
Background:
- Alström syndrome is a rare genetic disorder characterized by severe retinopathy.
- Early diagnosis and understanding of retinopathy progression are crucial for patient management.
Observation:
- Serial electroretinograms were performed on four pediatric patients with Alström syndrome (ages 6 months to 5 years).
- The study focused on characterizing the early stages of retinopathy.
Findings:
- Significant cone dysfunction was evident by 6 months of age, with cone activity becoming undetectable within a year.
- Initially normal rod function deteriorated rapidly, becoming undetectable by age 5.
- These electroretinographic patterns are pathognomonic for Alström syndrome.
Implications:
- The findings highlight the rapid and severe progression of retinopathy in Alström syndrome.
- Distinct electroretinographic findings differentiate Alström syndrome from similar genetic disorders like Bardet-Biedl syndrome.
- This research aids in the differential diagnosis of inherited retinal dystrophies.
Abstract:
We obtained serial electroretinograms in four patients aged between 6 months and 5 years with Alström's syndrome and studied the early stages of the severe retinopathy that is characteristic of that disease. The weak electroretinographic signals found at age 6 months demonstrate a severe early cone dysfunction; one year later the cone activity is undetectable. The rod component of the electroretinogram is initially normal but can rapidly deteriorate to become undetectable as early as 5 years of age. These unusual electroretinographic findings are pathognomonic of Alström's syndrome and different from other cone-rod dystrophies or other syndromes with similar phenotypes such as Bardet-Biedl, Laurence-Moon, and Cohen syndromes.