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Prader Willi Syndrome 1


Prader Willi Syndrome 1

Prader Willi Syndrome 1

Dysmorphic findings in a child with Prader-Willi syndrome include narrowing of the temples, almond-shaped eyes, strabismus, and a thin upper lip.

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Characteristic facial features in a person with Prader-Willi syndrome.

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Causes of Prader-Willi syndrome (PWS). This diagram represents chromosomes 15 of an unaffected father (blue with PWS critical region highlighted) and unaffected mother (pink). The children represent the three different mechanisms for PWS: a deletion in the PWS region on chromosome 15 that is inherited from the father (present in about 70 percent of patients) (A); both chromosomes 15 are inherited from the mother and the PWS region from the father is missing (present in about 25 percent of patients) (B); and a defect in methylation inherited from the father (present in less than 5 percent of patients) (C). In this case, the genes in the PWS critical region on the chromosome 15 inherited from the father are inactivated, similar to those of the mother

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Prader-Willi Syndrome (PWS) is an uncommon genetic disorder. It causes poor muscle tone, low levels of sex hormones and a constant feeling of hunger. The part of the brain that controls feelings of fullness or hunger does not work properly in people with PWS. They overeat, leading to obesity.
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