title: CRB1 mutations may result in retinitis pigmentosa without para-arteriolar RPE preservation.
abstract: OBJECTIVE
  To report a new phenotype in retinitis pigmentosa (RP) patients with CRB1 mutations at the RP12 locus.
  
  
  METHODS
  Thirty-seven patients from two Pakistani families with severe retinitis pigmentosa.
  
  
  METHODS
  Samples were screened with single-strand conformation polymorphism analysis followed by DNA sequencing of the coding sequence of the CRB1 gene.
  
  
  RESULTS
  Two novel CRB1 mutations were discovered. No patients had evidence of preservation of the para-arteriolar retinal pigment epithelium (PPRPE) that has been previously reported in all cases of RP associated with CRB1 mutations.
  
  
  CONCLUSIONS
  Patients with severe autosomal recessive (or simplex) RP who lack the finding of PPRPE should not be excluded from molecular analysis of CRB1 purely because they lack the clinical feature of PPRPE. This report illustrates that RP at the RP12 locus is not clinically uniform. The absence of PPRPE cannot be used to exclude CRB1 as a potential molecular explanation for RP.
authors.affiliation: Department of Ophthalmology, University of Iowa, College of Medicine, 200 Hawkins Drive, Iowa City, IA 52242-1091, USA.
authors.forename: A J
authors.initials: AJ
authors.lastname: Lotery
authors.forename: A
authors.initials: A
authors.lastname: Malik
authors.forename: S A
authors.initials: SA
authors.lastname: Shami
authors.forename: M
authors.initials: M
authors.lastname: Sindhi
authors.forename: B
authors.initials: B
authors.lastname: Chohan
authors.forename: C
authors.initials: C
authors.lastname: Maqbool
authors.forename: P A
authors.initials: PA
authors.lastname: Moore
authors.forename: M J
authors.initials: MJ
authors.lastname: Denton
authors.forename: E M
authors.initials: EM
authors.lastname: Stone
mesh_terms: D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D001160:Arterioles / Q000473:pathology; D004252:DNA Mutational Analysis; D029721:Drosophila Proteins; D005260:Female; D005451:Fluorescein Angiography; D005838:Genotype; D006801:Humans; D008297:Male; D008565:Membrane Proteins / Q000235:genetics*; D009154:Mutation / Q000235:genetics*; D010375:Pedigree; D010857:Pigment Epithelium of Eye / Q000473:pathology; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D012174:Retinitis Pigmentosa / Q000235:genetics* / Q000473:pathology
chemical_list: D029721:Drosophila Proteins; D008565:Membrane Proteins; C064360:crb protein, Drosophila