title: Genotype and phenotype in patients with Prader-Willi syndrome in Taiwan.
abstract: OBJECTIVE
  Several different genetic defects have been found to result in the characteristic phenotypic expression of Prader-Willi syndrome (PWS).
  
  
  METHODS
  We performed a retrospective analysis of 67 cases of molecularly confirmed PWS diagnosed from January 1980 through July 2006 in five medical centres in Taiwan. Clinical manifestations were compared between patients with deletion and those with maternal uniparental disomy (UPD).
  
  
  RESULTS
  Deletion was present in 56 (84%), UPD in 10 (15%), and a probable imprinting centre deletion or imprinting defect in 1 (1%). PWS with deletion was more likely than that with UPD to be characterized by hypogonadism (p < 0.001), small hands and feet (p < 0.001), and hypopigmentation (p < 0.002). Both maternal (p = 0.015) and paternal age (p = 0.021) were higher in the UPD group. No other clinical features differed significantly different between the two groups.
  
  
  CONCLUSIONS
  In contrast to most Western populations with a higher incidence of UPD, this study of PWS in Taiwan shows a higher incidence of deletion. There may be subtle phenotypic differences between the UPD and deletion genotypes, but its not clear that these are important clinically.
authors.affiliation: Department of Pediatrics, Mackay Memorial Hospital, Taipei, Taiwan.
authors.forename: Hsiang-Yu
authors.initials: HY
authors.lastname: Lin
authors.forename: Shuan-Pei
authors.initials: SP
authors.lastname: Lin
authors.forename: Chih-Kuang
authors.initials: CK
authors.lastname: Chuang
authors.forename: Ming-Ren
authors.initials: MR
authors.lastname: Chen
authors.forename: Jui-Lung
authors.initials: JL
authors.lastname: Yen
authors.forename: Yann-Jinn
authors.initials: YJ
authors.lastname: Lee
authors.forename: Chi-Yu
authors.initials: CY
authors.lastname: Huang
authors.forename: Li-Ping
authors.initials: LP
authors.lastname: Tsai
authors.forename: Dau-Ming
authors.initials: DM
authors.lastname: Niu
authors.forename: Mei-Chyn
authors.initials: MC
authors.lastname: Chao
authors.forename: Pao-Lin
authors.initials: PL
authors.lastname: Kuo
mesh_terms: D000293:Adolescent; D044466:Asian People; D002648:Child; D002675:Child, Preschool; D002872:Chromosome Deletion; D005260:Female; D005838:Genotype; D006801:Humans; D007223:Infant; D008297:Male; D010641:Phenotype; D011218:Prader-Willi Syndrome / Q000208:ethnology / Q000235:genetics*; D012189:Retrospective Studies; D013624:Taiwan; D024182:Uniparental Disomy / Q000235:genetics*; D044465:White People