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A mutation in the connexin 50 (Cx50) gene is a candidate for the No2 mouse cataract

E C Steele1, M F Lyon, J Favor

  • 1Emory Eye Center, Emory University School of Medicine, Atlanta, GA 30322, USA.

Current Eye Research
|September 24, 1998
PubMed
Abstract

Insights

A mutation in the Gja8 gene causes congenital hereditary cataracts in No2 mice. This study identifies the specific gene mutation responsible for the lens opacity, highlighting connexin 50

Area of Science:

  • Genetics
  • Ophthalmology
  • Molecular Biology

Background:

  • The No2 mouse mutant exhibits bilateral, congenital, hereditary nuclear opacity.
  • Understanding the genetic basis of such cataracts is crucial for ophthalmological research.

Purpose of the Study:

  • To identify and screen a candidate gene responsible for the observed cataract phenotype in No2 mice.
  • To investigate the genetic mutation underlying congenital hereditary cataracts.

Main Methods:

  • Genetic mapping of the No2 cataract using mouse crosses (Mus spretus and C3H/HeH strains).
  • Amplification and direct sequencing of the Cx50 (MP70) gene's coding region and flanking sequences.
  • Corroboration of sequence data using restriction analysis.

Main Results:

  • The No2 cataract was mapped near Gja8, the gene for connexin 50 (MP70), a key component of lens fiber gap junctions.
  • A single A-->C transversion was identified in codon 47 of the Cx50 gene.
  • This mutation results in a nonconservative substitution of alanine for aspartic acid, creating a new HhaI restriction site.

Conclusions:

  • The identified Gja8 mutation is correlated and consistent with the No2 mouse cataract phenotype.
  • This study provides the first evidence linking mutations in lens connexins to congenital hereditary cataracts.
  • Highlights the critical role of lens connexins in maintaining lens transparency.

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