Kerato-epithelin mutations in four 5q31-linked corneal dystrophies

Nat Genet. 1997 Mar;15(3):247-51. doi: 10.1038/ng0397-247.


Granular dystrophy Groenouw type I (CDGG1), Reis-Bücklers (CDRB), lattice type I (CDL1) and Avellino (ACD) are four 5q31-linked human autosomal dominant corneal dystrophies. Clinically, they show progressive opacification of the cornea leading to severe visual handicap. The nature of the deposits remains unknown in spite of amyloid aetiology ascribed to the last two. We generated a YAC contig of the linked region and, following cDNA selection, recovered the beta ig-h3 gene. In six affected families we identified missense mutations. All detected mutations occurred at the CpG dinucleotide of two arginine codons: R555W in one CDGG1, R555Q in one CDRB, R124C in two CDL1 and R124H in two ACD families. This suggests, as the last two diseases are characterized by amyloid deposits, that R124 mutated kerato-epithelin (the product of beta ig-h3) forms amyloidogenic intermediates that precipitate in the cornea. Our data establish a common molecular origin for the 5q31-linked corneal dystrophies.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Alternative Splicing
  • Base Sequence
  • Cells, Cultured
  • Chromosome Mapping
  • Chromosomes, Artificial, Yeast
  • Chromosomes, Human, Pair 5*
  • Cornea / metabolism
  • Corneal Dystrophies, Hereditary / genetics*
  • DNA Primers
  • Dinucleoside Phosphates
  • Exons
  • Extracellular Matrix Proteins*
  • Genes, Dominant
  • Genetic Linkage
  • Humans
  • Introns
  • Molecular Sequence Data
  • Neoplasm Proteins / genetics*
  • Point Mutation*
  • Polymerase Chain Reaction
  • Skin / metabolism
  • Transforming Growth Factor beta*


  • DNA Primers
  • Dinucleoside Phosphates
  • Extracellular Matrix Proteins
  • Neoplasm Proteins
  • Transforming Growth Factor beta
  • betaIG-H3 protein
  • cytidylyl-3'-5'-guanosine

Associated data

  • GENBANK/AF035626
  • GENBANK/AF035627
  • GENBANK/AF035628
  • GENBANK/AF035629