Different distribution of the genetic subtypes of the Prader-Willi syndrome in the elderly

The Prader–Willi syndrome (PWS) is a genetic disorder caused by the absent expression of the paternal copy of maternally imprinted genes in chromosome region 15q11–13. The frequencies of different subtypes in PWS are usually given in literature as 70% deletion, 25–30% maternal uniparental disomy (mU...

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Veröffentlicht in:European journal of human genetics : EJHG 2010-09, Vol.18 (9), p.993-998
Hauptverfasser: Sinnema, Margje, van Roozendaal, Kees E P, Maaskant, Marian A, Smeets, Hubert J M, Engelen, John J M, Jonker-Houben, Nieke, Schrander-Stumpel, Constance T R M, Curfs, Leopold M G
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Sprache:eng
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Zusammenfassung:The Prader–Willi syndrome (PWS) is a genetic disorder caused by the absent expression of the paternal copy of maternally imprinted genes in chromosome region 15q11–13. The frequencies of different subtypes in PWS are usually given in literature as 70% deletion, 25–30% maternal uniparental disomy (mUPD) and 3–5% others (imprinting centre (IC) defects and translocations). Little is known about factors that influence the frequency of genetic subtypes in PWS. The study sample comprised 102 adults with clinically and genetically confirmed PWS, contacted through the Dutch Prader–Willi Parent Association and through physicians specialized in treating persons with intellectual disabilities. Genetic testing showed 55 persons (54%) with a paternal deletion, 44 persons (43%) with an mUPD and 3 persons (3%) with a defect of the IC. The observed distribution in our study differed from that in literature (70% deletion, 30% mUPD), which was statistically significant ( z -score: P
ISSN:1018-4813
1476-5438
DOI:10.1038/ejhg.2010.67