Mutations in the EPHA2 gene are a major contributor to inherited cataracts in South-Eastern Australia

PLoS One. 2013 Aug 27;8(8):e72518. doi: 10.1371/journal.pone.0072518. eCollection 2013.

Abstract

Congenital cataract is the most common cause of treatable visual impairment in children worldwide. Mutations in many different genes lead to congenital cataract. Recently, mutations in the receptor tyrosine kinase gene, EPHA2, have been found to cause congenital cataract in six different families. Although these findings have established EPHA2 as a causative gene, the total contribution of mutations in this gene to congenital cataract is unknown. In this study, for the first time, a population-based approach was used to investigate the frequency of disease causing mutations in the EPHA2 gene in inherited cataract cases in South-Eastern Australia. A cohort of 84 familial congenital or juvenile cataract index cases was screened for mutations in the EPHA2 gene by direct sequencing. Novel changes were assessed for segregation with the disease within the family and in unrelated controls. Microsatellite marker analysis was performed to establish any relationship between families carrying the same mutation. We report a novel congenital cataract causing mutation c.1751C>T in the EPHA2 gene and the previously reported splice mutation c.2826-9G>A in two new families. Additionally, we report a rare variant rs139787163 potentially associated with increased susceptibility to cataract. Thus mutations in EPHA2 account for 4.7% of inherited cataract cases in South-Eastern Australia. Interestingly, the identified rare variant provides a link between congenital and age-related cataract.

Publication types

  • Clinical Trial
  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Australia / epidemiology
  • Cataract / enzymology
  • Cataract / epidemiology
  • Cataract / genetics*
  • Cohort Studies
  • Family
  • Female
  • Gene Frequency*
  • Genetic Diseases, Inborn / enzymology
  • Genetic Diseases, Inborn / epidemiology
  • Genetic Diseases, Inborn / genetics*
  • Genetic Predisposition to Disease*
  • Humans
  • Male
  • Pedigree
  • Point Mutation*
  • Receptor, EphA2 / genetics*
  • Receptor, EphA2 / metabolism

Substances

  • Receptor, EphA2

Grants and funding

This work was funded by grants from the National Health and Medical Research Council (NHMRC), Australia project grant #GNT1995500 and Translation of Genetic Eye Research (TOGER) Centre for Research Excellence (CRE), and grant from the Ophthalmic Research Institute of Australia. Author JEC is recipient of a NHMRC practitioner fellowship and KPB of a NHMRC career development award. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.