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Related Experiment Videos

VSX1: a gene for posterior polymorphous dystrophy and keratoconus.

Elise Héon1, Alex Greenberg, Kelly K Kopp

  • 1Cellular and Molecular Division, Toronto Western Research Institute, Toronto Western Hospital, 399 Bathurst Street, Toronto, Ontario, Canada M5T 2S8. eheon@uhnres.utoronto.ca

Human Molecular Genetics
|April 30, 2002
PubMed
Summary

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Mutations in the VSX1 gene cause inherited corneal dystrophies like posterior polymorphous dystrophy (PPD) and keratoconus. These genetic defects impact both the cornea and inner retinal function.

Area of Science:

  • Genetics
  • Ophthalmology
  • Molecular Biology

Background:

  • Inherited corneal dystrophies are a group of disorders affecting the cornea.
  • The VSX1 homeobox gene is implicated in ocular development and function.

Observation:

  • Mutations in the VSX1 gene were identified in patients with posterior polymorphous dystrophy (PPD) and keratoconus.
  • Specific mutations (R166W, L159M, G160D, P247R) were linked to different severities and types of corneal dystrophy.
  • Severe PPD cases showed mutations affecting the homeodomain, adjacent regions, and the CVC domain of VSX1.

Findings:

  • A mutation (R166W) in the VSX1 homeodomain impaired DNA binding, linking it to keratoconus.
  • Mutations G160D and P247R, associated with PPD, also led to abnormal inner retinal function detected by electroretinography.

Related Experiment Videos

  • The severity of PPD correlated with specific VSX1 mutations, with combined mutations causing more severe phenotypes.

    • Implications:

    • This study establishes the molecular basis for PPD and keratoconus, identifying VSX1 as a key gene.
    • The findings highlight the critical role of the VSX1 CVC domain in human retinal function.
    • Understanding these genetic links may pave the way for future diagnostic and therapeutic strategies for corneal and retinal diseases.