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Mouse models of cataract.

Jochen Graw1

  • 1Helmholtz Center Munich, German Research Center for Environmental Health, Institute of Developmental Genetics, Neuherberg, Germany. graw@helmholtz-muenchen.de

Journal of Genetics
|January 22, 2010
PubMed
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Mouse models reveal genetic causes of congenital cataracts, primarily affecting crystallin genes. Understanding these mutations offers insights into lens development and potential systemic syndromes.

Area of Science:

  • Genetics
  • Ophthalmology
  • Developmental Biology

Background:

  • Mouse models are crucial for understanding gene function in cataracts.
  • Most mouse cataract models exhibit congenital cataracts, limiting insights into age-related lens changes.
  • Molecular analysis requires chromosomal localization of causative genes.

Purpose of the Study:

  • To review mouse models of cataracts with a focus on their genetic basis.
  • To highlight the genes involved in various types of hereditary cataracts.
  • To explore the broader implications of cataract-associated genes beyond the eye.

Main Methods:

  • Review of existing literature on mouse cataract models.
  • Emphasis on the genetic underpinnings of cataracts rather than morphology.

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  • Categorization of mutations based on affected gene types (crystallins, membrane proteins, transcription factors).

    • Main Results:

    • Congenital cataracts frequently involve mutations in gamma-crystallin (Cryg) genes.
    • Progressive cataracts can result from mutations in beta-crystallin (Cryb) genes.
    • Mutations in membrane proteins (MIP, connexins) and transcription factors (FoxE3, Maf, Sox1, Six5) also cause congenital cataracts.
    • Genetically uncharacterized age-related cataract models exist (e.g., Emory cataract).

    Conclusions:

    • Many hereditary congenital cataracts are well-understood at the molecular level.
    • Genes involved in cataracts often have functions outside the eye, indicating pleiotropic effects.
    • Cataracts may serve as visible biomarkers for systemic syndromes.