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[Sorsby's fundus dystrophy. A genetically homogeneous disease]

U Felbor1, B H Weber

  • 1Institut für Humangenetik der Universität, Würzburg.

Der Ophthalmologe : Zeitschrift Der Deutschen Ophthalmologischen Gesellschaft
|June 27, 1998
PubMed
Summary

Tissue inhibitor of metalloproteinases-3 (TIMP3) mutations exclusively cause Sorsby Fundus Dystrophy (SFD), indicating genetic homogeneity. This research clarifies SFD

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Area of Science:

  • Ophthalmology and Genetics
  • Molecular Biology

Context:

  • The identification of TIMP3 as the gene responsible for Sorsby Fundus Dystrophy (SFD) allows for investigation into genetic heterogeneity.
  • SFD's potential role as a genetic model for age-related macular degeneration (AMD) necessitates further study.

Purpose:

  • To investigate the genetic heterogeneity of SFD.
  • To determine if SFD is directly involved in other maculopathies, including AMD.
  • To analyze TIMP3 mutations in SFD pedigrees and various maculopathy patient cohorts.

Summary:

  • Molecular genetic analysis confirmed autosomal dominant inheritance in SFD, with unique TIMP3 mutations found in unrelated pedigrees.
  • A common ancestral Ser181Cys TIMP3 mutation was identified in affected individuals across multiple SFD families globally.
  • Screening of 217 patients with diverse maculopathies did not reveal disease-causing mutations in the TIMP3 gene.

Impact:

  • TIMP3 mutations are exclusively associated with SFD, establishing the disorder as genetically homogeneous.
  • SFD exhibits complete penetrance with variable expressivity, providing insights into genotype-phenotype correlations.
  • This research clarifies the genetic basis of SFD and its distinction from other macular dystrophies.

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