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Sorsby fundus dystrophy without a mutation in the TIMP-3 gene
J J Assink1, E de Backer, J B ten Brink
1Department Ophthalmogenetics, The Netherlands Ophthalmic Research Institute, Netherlands.
The British Journal of Ophthalmology
|June 30, 2000
Summary
This study investigated a family with autosomal dominant fundus dystrophy, likely Sorsby fundus dystrophy. Despite linkage to chromosome 22q12.1-q13.2, mutations in the TIMP-3 gene were not identified as the cause.
Area of Science:
- Ophthalmology
- Medical Genetics
Background:
- Autosomal dominant fundus dystrophies are a group of inherited retinal diseases.
- Sorsby fundus dystrophy is a specific type characterized by progressive visual loss.
Purpose of the Study:
- To investigate a large family with autosomal dominant fundus dystrophy.
- To determine if mutations in the TIMP-3 gene are associated with this condition.
Main Methods:
- Ophthalmological examination of 58 family members.
- DNA linkage analysis in the 22q12.1-q13.2 region.
- Screening of the TIMP-3 gene for mutations.
Main Results:
- 15 out of 58 individuals were affected with fundus dystrophy.
- Typical findings included pisciform flecks, drusen-like deposits, chorioretinal atrophy, and neovascularization.
- Linkage analysis showed a maximum lod score of 3.94 with marker D22S283.
- No causative mutations were found in the TIMP-3 gene.
Conclusions:
- The family likely has Sorsby fundus dystrophy.
- While linkage to 22q12.1-q13.2 was established, the TIMP-3 gene was excluded as the causative mutation.
- Further research is needed to identify the genetic cause of this fundus dystrophy.