title: A novel 1-bp deletion in PITX3 causing congenital posterior polar cataract.
abstract: OBJECTIVE
  Cataracts are the most common cause of blindness worldwide. Inherited cataract is a clinically and genetically heterogeneous disease. Here we report a novel mutation in the paired-like homeodomain 3 (PITX3) gene segregating in a four generation English family with an isolated autosomal dominant posterior polar cataract.
  
  
  METHODS
  A genome-wide linkage was performed by means of single nucleotide polymorphism (SNP) and microsatellite markers. Linkage analyses were performed with the GeneHunter and MLINK programs. Direct sequencing of PCR products was performed to detect mutation in the gene, using the BigDye version 3.1 and analyzed using Sequence analysis version 5.2.
  
  
  RESULTS
  Genome-wide linkage analysis with SNP markers, identified a disease-haplotype interval on chromosome 10q. Two point positive logarithm of odds (LOD) scores was obtained with markers D10S205 (Z=3.10 at θ=0.00), flanked by markers D10S1709 and D10S543, which harbors the homeobox gene PITX3. Sequence analysis of PITX3 revealed a 1-bp deletion that cosegregated with all the affected members of this family which resulted in a frameshift in codon 181 and likely to produce an aberrant protein consisting of 127 additional residues.
  
  
  CONCLUSIONS
  The 542delC is a novel mutation in PITX3 causing an isolated posterior polar cataract.
authors.affiliation: Department of Genetics, Institute of Ophthalmology, University College London, London, UK. v.berry@ucl.ac.uk
authors.forename: Vanita
authors.initials: V
authors.lastname: Berry
authors.forename: Peter J
authors.initials: PJ
authors.lastname: Francis
authors.forename: Quincy
authors.initials: Q
authors.lastname: Prescott
authors.forename: Naushin H
authors.initials: NH
authors.lastname: Waseem
authors.forename: Anthony T
authors.initials: AT
authors.lastname: Moore
authors.forename: Shomi S
authors.initials: SS
authors.lastname: Bhattacharya
mesh_terms: D002386:Cataract / Q000151:congenital* / Q000235:genetics*; D002879:Chromosomes, Human, Pair 10 / Q000235:genetics; D003596:Cytosine; D005091:Exons; D017353:Gene Deletion; D005799:Genes, Dominant; D008040:Genetic Linkage; D005819:Genetic Markers; D006239:Haplotypes; D018398:Homeodomain Proteins / Q000235:genetics*; D006801:Humans; D008126:Lod Score; D010375:Pedigree; D014157:Transcription Factors / Q000235:genetics*
chemical_list: D005819:Genetic Markers; D018398:Homeodomain Proteins; D014157:Transcription Factors; C433629:homeobox protein PITX3; D003596:Cytosine