title: Genetic and phenotypic characteristics of three Mainland Chinese families with choroideremia.
abstract: OBJECTIVE
  To describe the phenotype and genotype of three Mainland Chinese families affected by choroideremia (CHM).
  
  
  METHODS
  Complete ophthalmic examinations were conducted in three unrelated Chinese families with CHM. Peripheral blood samples were collected from the families for genetic and immunoblot analysis. All exons and flanking intronic regions of the gene encoding Rab escort protein-1 (Rep-1) were amplified with PCR and screened for mutations with Sanger sequencing. The three-dimensional structure of mutated Rep-1 was modeled using sequence homology with rat proteins to analyze the effect of the mutation detected in one family.
  
  
  RESULTS
  All affected males had characteristic signs and symptoms of CHM; however, central visual acuity impairment occurred earlier than expected. All female carriers older than 45 years had pigmentary changes, and one female carrier was symptomatic with vision loss. Three different mutations in Rep-1, c.1801-1G>A, c.1130 T>A, and c.612delAG, were detected in the three families.
  
  
  CONCLUSIONS
  In Mainland Chinese families, the central visual acuity of male patients with CHM can be affected at an early age (second decade), whereas female CHM carriers may manifest signs and symptoms at a later age (≥ 45 years). One previously reported and two novel Rep-1 mutations were detected in three Chinese patients with CHM.
authors.affiliation: Department of Ophthalmology, Peking Union Medical College Hospital, Peking Union Medical College and Chinese Academy of Medical Sciences, Beijing, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhou
authors.forename: Liang
authors.initials: L
authors.lastname: Liu
authors.forename: Fei
authors.initials: F
authors.lastname: Xu
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Yuri
authors.initials: Y
authors.lastname: Sergeev
authors.forename: Fangtian
authors.initials: F
authors.lastname: Dong
authors.forename: Ruxin
authors.initials: R
authors.lastname: Jiang
authors.forename: Ian
authors.initials: I
authors.lastname: MacDonald
authors.forename: Ruifang
authors.initials: R
authors.lastname: Sui
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000737:chemistry / Q000235:genetics*; D000328:Adult; D017668:Age of Onset; D000368:Aged; D044466:Asian People / Q000235:genetics; D001483:Base Sequence; D002681:China; D015794:Choroideremia / Q000235:genetics* / Q000473:pathology / Q000503:physiopathology; D004252:DNA Mutational Analysis; D005260:Female; D005451:Fluorescein Angiography; D056726:Genetic Association Studies; D006579:Heterozygote; D006801:Humans; D008297:Male; D008875:Middle Aged; D008958:Models, Molecular; D009154:Mutation; D010375:Pedigree; D011487:Protein Conformation; D014792:Visual Acuity / Q000235:genetics; D055815:Young Adult
chemical_list: D048868:Adaptor Proteins, Signal Transducing; C081787:CHM protein, human