Does parent of origin matter? Methylation studies should be performed on patients with multiple copies of the Prader-Willi/Angelman syndrome critical region.

Abstract excerpt

Deletion of 15q11.2-q13 results in either Prader-Willi syndrome (PWS) or Angelman syndrome (AS) depending on the parent of origin. Duplication of the PWS/AS critical region (PWASCR) has also been reported in association with developmental delay and autism, and it has been shown that they also show a parent-of-origin effect. It is generally accepted that maternal duplications are pathogenic. However, there is...

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