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Table 1 Frequency of genetic subtypes associated with PWS

From: Prader-Willi syndrome: A primer for clinicians

Subtype Frequency
Paternal deletion of chromosome 15q11-q13 (type I or II) 75%
Maternal uniparental disomy (UPD) 24%
Imprinting center defects (ID) 1%
Translocation < 1%