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A characteristic phenotypic retinal appearance in Norrie disease
Kimberly A Drenser1, Alice Fecko, Wendy Dailey
1William Beaumont Hospital, Royal Oak, MI 48073, USA. kimber@pol.net
Retina (Philadelphia, Pa.)
|February 10, 2007
Summary
Norrie disease causes severe retinal dysplasia, characterized by dense stalk tissue and globular retinal changes. Mutations in the Norrie gene, particularly those affecting the cystine knot domain, correlate with this severe phenotype.
Area of Science:
- Ophthalmology
- Genetics
- Developmental Biology
Background:
- Norrie disease is a rare X-linked inherited disorder.
- It is characterized by congenital blindness due to persistent hyperplastic primary vitreous and retinal dysplasia.
- The underlying genetic cause is mutations in the Norrie disease pseudogene (NDP).
Purpose of the Study:
- To describe a unique retinal finding observed exclusively in Norrie disease.
- To investigate the correlation between specific Norrie gene genotypes and this severe retinal presentation.
Main Methods:
- Retrospective analysis of four patients with Norrie disease over one year.
- Direct sequencing of the Norrie gene (NDP) in all patients.
Main Results:
- All patients exhibited a consistent retinal phenotype: dense stalk tissue, globular dystrophic retina, and peripheral avascular retina with pigmentary changes.
- Mutations were identified in the Norrie gene, specifically affecting a cystine residue within the cystine knot domain.
- These mutations are predicted to disrupt the norrin protein structure, impacting Wnt signaling pathway activation.
Conclusions:
- The described retinal presentation of severe retinal dysplasia is highly characteristic of Norrie disease.
- Mutations within the cystine knot domain of the Norrie gene are associated with devastating effects on retinal development.
- A strong correlation exists between the phenotype and mutations affecting the cystine knot domain of the Norrie gene.
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