Related Experiment Videos
An early decrease in interphotoreceptor retinoid-binding protein gene expression in Abyssinian cats homozygous for
B Wiggert1, T van Veen, G Kutty
1National Eye Institute, National Institutes of Health, Bethesda, Maryland 20892.
Cell and Tissue Research
|November 1, 1994
Summary
Early detection of reduced interphotoreceptor retinoid-binding protein (IRBP) in Abyssinian cats reveals a potential primary defect in progressive rod-cone degeneration before clinical symptoms appear.
Area of Science:
- Ophthalmology
- Genetics
- Molecular Biology
Background:
- Progressive rod-cone degeneration (prcd) is an inherited retinal disease affecting Abyssinian cats.
- Early molecular markers for prcd are crucial for understanding disease progression.
Purpose of the Study:
- To investigate interphotoreceptor retinoid-binding protein (IRBP) levels in Abyssinian cats with prcd at early ages.
- To determine if reduced IRBP is an early indicator of retinal degeneration.
Main Methods:
- Quantification of IRBP protein and mRNA using immunochemistry, Northern blotting, and slot-blotting.
- Assessment of retinal morphology via electron microscopy and immunocytochemistry.
- Analysis of opsin mRNA levels.
Main Results:
- Significantly reduced IRBP protein and message were observed in affected cats by 4 weeks of age, preceding clinical signs.
- Opsin mRNA levels were elevated in affected cats compared to controls, over a year before symptom onset.
- Early retinal disorientation correlated with decreased IRBP gene expression.
Conclusions:
- Reduced IRBP gene expression is an early molecular event in Abyssinian cats with prcd.
- This reduction may represent a primary defect or an early contributing factor to retinal degeneration.
- IRBP levels serve as a potential biomarker for early diagnosis of prcd.