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Related Experiment Videos

Candidate gene screening for posterior polymorphous dystrophy.

Anthony J Aldave1, Vivek S Yellore, Alexandre H Principe

  • 1Cornea Service, The Jules Stein Eye Institute, University of California, Los Angeles, California 90095, USA. aldave@jsei.ucla.edu

Cornea
|February 24, 2005
PubMed
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Genetic screening for posterior polymorphous corneal dystrophy (PPCD) did not identify mutations in VSX1, ID1, or BCL2L1 genes. Novel polymorphisms were found, but no causative variants were linked to PPCD in this study.

Area of Science:

  • Ophthalmology
  • Genetics
  • Molecular Biology

Background:

  • Posterior polymorphous corneal dystrophy (PPCD) is a rare inherited eye disorder.
  • Previous studies linked PPCD to chromosome 20 and identified mutations in the VSX1 gene.

Purpose of the Study:

  • To screen candidate genes (VSX1, BCL2L1, ID1) for mutations in patients with PPCD.
  • To investigate the role of VSX1, BCL2L1, and ID1 in the pathogenesis of PPCD.

Main Methods:

  • DNA was extracted from 14 PPCD patients (12 families) and controls.
  • PCR amplification and direct sequencing were used to analyze the VSX1, BCL2L1, and ID1 genes.

Main Results:

  • No coding mutations were found in BCL2L1 or ID1.

Related Experiment Videos

  • The previously reported VSX1 Gly160Asp mutation was absent in all probands.
  • The VSX1 Asp144Glu variant was identified in both an affected patient and an unaffected control, suggesting it is a rare polymorphism. Novel synonymous substitutions and UTR variants were identified in VSX1 and ID1.
  • Conclusions:

    • The previously identified VSX1 Gly160Asp mutation is not a common cause of PPCD in this cohort.
    • The VSX1 Asp144Glu variant is likely a rare polymorphism.
    • No disease-causing mutations were identified in the coding regions of VSX1, ID1, or BCL2L1, indicating that other genetic factors likely contribute to PPCD.