title: [Localization and screening of autosomal dominant coralliform cataract associated gene].
abstract: OBJECTIVE
  To identify the genetic defect for the autosomal dominant coralliform cataract affecting a four-generation Chinese family.
  
  
  METHODS
  Genomic DNA from the family members was typed for whole genomic linkage analysis. Two-point LOD scores were calculated using the LINKAGE program package (version 5.1). Mutation analysis of candidate genes was performed by direct sequencing.
  
  
  RESULTS
  Thirteen of the 38 individuals had congenital cataracts. The maximum two point LOD score, 3.5 at theta=0.1 was obtained for the marker D2S325. Mutation analysis of the gamma-crystallin gene cluster identified a C --> A mutation in exon 2 of gamma-D crystallin gene (CRYGD) associated with cataracts in this family. This mutation resulted in a substitution of threonine for proline at amino acid 23 (P23T) of the protein.
  
  
  CONCLUSIONS
  The results suggest that the coralliform cataract phenotype is due to a mutated gamma-D gene, and the sequence change is identical with that recently reported to be related with lamellar cataract, a distinct clinical entity, thus providing evidence that the same genetic defect may be associated with different opacity location. The pathogenesis needs further investigation.
authors.affiliation: Cancer Institute, Zhejiang University College of Medicine, Zhejiang University, Hangzhou, PR China.
authors.forename: Wei-zhen
authors.initials: WZ
authors.lastname: Xu
authors.forename: Shu
authors.initials: S
authors.lastname: Zheng
authors.forename: Shi-jie
authors.initials: SJ
authors.lastname: Xu
authors.forename: Wei
authors.initials: W
authors.lastname: Huang
authors.forename: Ke
authors.initials: K
authors.lastname: Yao
authors.forename: Su-zhan
authors.initials: SZ
authors.lastname: Zhang
mesh_terms: D001483:Base Sequence; D002386:Cataract / Q000175:diagnosis / Q000235:genetics*; D004247:DNA / Q000737:chemistry / Q000235:genetics; D004252:DNA Mutational Analysis; D005192:Family Health; D005260:Female; D005799:Genes, Dominant / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005820:Genetic Testing; D006801:Humans; D008126:Lod Score; D008297:Male; D009154:Mutation; D010375:Pedigree; D010641:Phenotype; D020033:Protein Isoforms / Q000235:genetics; D038222:gamma-Crystallins / Q000235:genetics
chemical_list: D020033:Protein Isoforms; D038222:gamma-Crystallins; D004247:DNA