Deletion: A small interstitial deletion between 15q11 and 15q13 can result in two completely different clinical syndromes depending upon the parental origin of the chromosome with the deletion. A paternally-derived chromosome 15 with this deletion results in prader-willi syndrome, and a maternally-derived chromosome 15 with a similar deletion results in angelman syndrome (or happy-puppet syndrome).
Answered 10/3/2016
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