A gene (RPGR) with homology to the RCC1 guanine nucleotide exchange factor is mutated in X-linked retinitis pigmentosa (RP3)

Nat Genet. 1996 May;13(1):35-42. doi: 10.1038/ng0596-35.


X-linked retinitis pigmentosa (xlRP) is a severe progressive retinal degeneration which affects about 1 in 25,000 of the population. The most common form of xlRP, RP3, has been localised to the interval between CYBB and OTC in Xp21.1 by linkage analysis and deletion mapping. Identification of microdeletions within this region has now led to the positional cloning of a gene, RPGR, that spans 60 kg of genomic DNA and is ubiquitously expressed. The predicted 90 kD protein contains in its N-terminal half a tandem repeat structure highly similar to RCC1 (regulator of chromosome condensation), suggesting an interaction with a small GTPase. The C-terminal half contains a domain, rich in acidic residues, and ends in a potential isoprenylation anchorage site. The two intragenic deletions, two nonsense and three missense mutations within conserved domains provide evidence that RPGR (retinitis pigmentosa GTPase regulator) is the RP3 gene.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Base Sequence
  • Carrier Proteins / biosynthesis*
  • Carrier Proteins / genetics*
  • Cell Cycle Proteins*
  • Chromosome Mapping
  • Cloning, Molecular
  • Conserved Sequence
  • DNA Primers
  • DNA-Binding Proteins / genetics*
  • Eye Proteins*
  • Female
  • GTP Phosphohydrolases / metabolism
  • GTP-Binding Proteins / genetics*
  • Gene Expression
  • Guanine Nucleotide Exchange Factors*
  • Humans
  • Male
  • Molecular Sequence Data
  • Nuclear Proteins / genetics
  • Pedigree
  • Polymerase Chain Reaction
  • Protein Prenylation
  • Repetitive Sequences, Nucleic Acid
  • Retinitis Pigmentosa / genetics*
  • Saccharomyces cerevisiae / genetics
  • Sequence Homology, Amino Acid
  • X Chromosome*
  • Xenopus
  • Xenopus Proteins


  • Carrier Proteins
  • Cell Cycle Proteins
  • DNA Primers
  • DNA-Binding Proteins
  • Eye Proteins
  • Guanine Nucleotide Exchange Factors
  • Nuclear Proteins
  • RCC1 protein, Xenopus
  • RCC1 protein, human
  • RPGR protein, human
  • Xenopus Proteins
  • GTP Phosphohydrolases
  • GTP-Binding Proteins

Associated data

  • GENBANK/U57629

Grants and funding