Posterior polar cataract: Genetic analysis of a large family

Simone Finzi, Yingying Li, Thomas N. Mitchell, Arman Farr, Irene H. Maumenee, Juliana M.F. Sallum, Olof Sundin

Research output: Contribution to journalArticle

Abstract

Congenital cataracts are clinically and genetically heterogeneous. Loci for autosomal dominant posterior polar cataracts have been mapped to chromosomes 1p36, 11q22-q22.3, 16q22, and 20p12-q12. We investigated a large four-generation family with 20 individuals affected with congenital posterior polar cataracts. After exclusion of known loci for posterior polar cataracts, a genome-wide screen was conducted. In this family, we mapped dominant congenital posterior polar cataracts to chromosome 10q24. On haplotype analysis, we identified an 11-cM interval between loci D10S1680 and D10S467, which included the PITX3 gene. On sequencing the coding region of PITX3, we found a 17-base-pair duplication in exon 4. Although the same genotype was described in a family with ASMD and cataracts, the common phenotype of this mutation is probably posterior polar cataract; a modifier gene is presumed to cause anterior segment abnormalities in the previously described patients. The same mutation was recently identified in four families with congenital cataracts. This study provides further evidence of genetic heterogeneity of autosomal dominant posterior polar cataract.

Original languageEnglish (US)
Pages (from-to)125-130
Number of pages6
JournalOphthalmic genetics
Volume26
Issue number3
DOIs
StatePublished - Sep 1 2005

Keywords

  • Cataracts
  • Congenital
  • Genetics
  • Linkage

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Ophthalmology
  • Genetics(clinical)

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  • Cite this

    Finzi, S., Li, Y., Mitchell, T. N., Farr, A., Maumenee, I. H., Sallum, J. M. F., & Sundin, O. (2005). Posterior polar cataract: Genetic analysis of a large family. Ophthalmic genetics, 26(3), 125-130. https://doi.org/10.1080/13816810500229124