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A novel GJA8 mutation causing a recessive triangular cataract.

Werner Schmidt1, Norman Klopp, Thomas Illig

  • 1Center of Ophthalmology, Universities of Giessen and Marburg, Giessen, Germany.

Molecular Vision
|May 17, 2008
PubMed
Summary
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A genetic mutation (ins776G) in the GJA8 gene causes recessive triangular cataracts in a consanguineous family. Heterozygotes show milder lens opacity, indicating variable expressivity.

Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • Congenital cataracts are a significant cause of visual impairment.
  • Understanding the genetic basis of hereditary cataracts is crucial for diagnosis and potential therapies.

Observation:

  • A consanguineous family (Family D) presented with congenital cataracts.
  • The proband exhibited a dense, triangular nuclear cataract.
  • Affected relatives showed varying degrees of lens opacity.

Findings:

  • A homozygous GJA8 gene mutation (ins776G) was identified in the proband, causing a frame shift.
  • This mutation was also found in a cataract-affected sibling.
  • Heterozygous family members displayed a weaker phenotype, suggesting variable expressivity.

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Implications:

  • The ins776G mutation is strongly associated with recessive triangular cataracts.
  • This finding expands the known spectrum of GJA8-related eye disorders.
  • Genetic characterization aids in understanding cataract pathogenesis and inheritance patterns.