Osmosis video - Prader-Willi syndrome

Prader �Willi syndrome is a rare genetic disorder in which certain genes on chromosome 15 are deleted or unexpressed on the paternal chromosome. Symptoms include low muscle tone, short stature, incomplete sexual development, cognitive disabilities, behavior problems, and a chronic feeling of hunger that can lead to excessive eating and life-threatening obesity. Treatment involves a combination of genetic counseling, medical care, and behavior therapy.