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Genotype and phenotype in patients with Prader–Willi Syndrome in Taiwan
Author(s) -
Lin HsiangYu,
Lin ShuanPei,
Chuang ChihKuang,
Chen MingRen,
Yen JuiLung,
Lee YannJinn,
Huang ChiYu,
Tsai LiPing,
Niu DauMing,
Chao MeiChyn,
Kuo PaoLin
Publication year - 2007
Publication title -
acta pædiatrica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.772
H-Index - 115
eISSN - 1651-2227
pISSN - 0803-5253
DOI - 10.1111/j.1651-2227.2007.00284.x
Subject(s) - hypopigmentation , medicine , uniparental disomy , incidence (geometry) , genotype , phenotype , imprinting (psychology) , genetics , pediatrics , retrospective cohort study , dermatology , karyotype , gene , biology , chromosome , physics , optics
Aim: 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. Conclusion: 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.