Prader-Willi syndrome and Angelman syndrome are two rare chromosome disorders, with very different symptoms, but caused by the same area of DNA. They are important to genetic research because they are caused by imprinting.
See full list of 38 symptoms of Angelman syndrome
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See full list of 6 occasional symptoms of Angelman syndrome
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Source: HealthDay News
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Prognosis for Angelman syndrome: Good survival rate but with mental delay or retardation, and physical problems such as balance and speech abnormalities.
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The US based website ClinicalTrials.gov lists information on both federally and privately supported clinical trials using human volunteers.
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Angelman syndrome is a neurological disorder characterized by severe congenital mental retardation, unusual facial appearance, and muscular abnormalities. (Source: excerpt from NINDS Angelman Syndrome Information Page: NINDS)
A condition in which children laugh frequently for almost any reason and whose jerky movements and flapping of the hands are similar to those of a marionette, or puppet-- hence the synonym "happy puppet syndrome." Other disorders include a peculiar facial expression, mental retardation, movement disorders, microbrachycephaly, and various neurological disorders. - (Source - Diseases Database)
Angelman syndrome is listed as a "rare disease" by the Office of
Rare Diseases (ORD) of the National Institutes of Health
(NIH). This means that Angelman syndrome, or a subtype of Angelman syndrome,
affects less than 200,000 people in the US population.
Source - National Institutes of Health (NIH)
Ophanet, a consortium of European partners,
currently defines a condition rare when it affects 1 person per 2,000.
They list Angelman syndrome as a "rare disease".
Source - Orphanet
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