What is PWS?

Prader-Willi syndrome (PWS) is the most common known genetic cause of life-threatening obesity in children. Although the cause is complex it results from an abnormality on the 15th chromosome. It occurs in males and females equally and in all races. Prevalence estimates have ranged from 1:8,000 to 1:25,000 with the most likely figure being 1:15,000.

PWS typically causes low muscle tone, short stature if not treated with growth hormone, incomplete sexual development, motor and social development delays and a chronic feeling of hunger that, coupled with a metabolism that utilizes drastically fewer calories than normal, can lead to excessive eating and life-threatening obesity. The food compulsion makes constant supervision necessary. Children with PWS can be sweet and loving, but they display characteristics of the Prader-Willi personality that can cause social and behavioral problems. They also have many complex and unique medical issues. With knowledge, support and understanding, persons with PWS can and do become valued members in our communities. They need to be supported by parents, care givers and professionals who have the knowledge and tools needed to assist them in doing this. PWSA of WI, Inc. provides a variety of services to make this possible.

With knowledge, support and understanding, persons with PWS can and do become valued members in our communities. They need to be supported by parents, care givers and professionals who have the knowledge and tools needed to assist them in doing this. PWSA of WI, Inc. provides a variety of services to make this possible.

Basic Facts on Prader-Willi syndrome

Who has Prader-Willi syndrome (PWS)?
PWS can occur in any family, and cannot be prevented. There is no known cause.

What is Prader-Willi syndrome?
PWS is a complex genetic disorder affecting appetite, growth, metabolism, cognitive function and behavior.  It is typically characterized by low muscle tone, short stature (when not treated with growth hormone), incomplete sexual development, cognitive disabilities, behavioral problems, and the hallmark characteristics – chronic feelings of insatiable hunger and a slowed metabolism that can lead to excessive eating and life-threatening obesity. Those who have PWS need intervention and strict external controls, sometimes including padlocking access to food, to maintain normal weight and to help save their lives.

How many people have Prader-Willi syndrome?
It is estimated that one in 12,000 to 15,000 people has PWS.  Although considered a “rare” disorder, PWS is one of the most common conditions seen in genetic clinics and is the most common genetic cause of obesity that has been identified to date.

Where is Prader-Willi syndrome found?
PWS is found in people of both sexes and in all races worldwide.

Why does Prader-Willi syndrome occur?
Most cases of PWS are attributed to a spontaneous genetic error that occurs at or near the time of conception for unknown reasons. In a very small percentage of cases (2 percent or less), a genetic mutation that does not affect the parent is passed on to the child, and in these families, more than one child may be affected.  A PWS-like disorder can also be acquired after birth if the hypothalamus portion of the brain becomes damaged through injury or surgery.

What is the cause of Prader-Willi syndrome?
Basically, the occurrence of PWS is due to lack of several genes on one of an individual’s two chromosome 15’s – the one normally contributed by the father.  In the majority of cases, there is a deletion – the critical genes are somehow lost from the chromosome.  In some of the remaining cases, the entire chromosome from the father is missing and there are instead two chromosome 15’s from the mother (uniparental disomy).  The critical paternal genes lacking in people with PWS have a role in the regulation of appetite.  This is an area of active research in a number of laboratories around the world, since understanding this defect may be very helpful not only to those with PWS, but to understanding obesity in otherwise normal people.

People with PWS have a flaw in the hypothalamus part of their brain, which normally registers feelings of hunger and satiety.  While the problem is not yet fully understood, it is apparent that people with this flaw never feel full; they have a continuous urge to eat that they cannot learn to control.  To compound this problem, people with PWS need less food than their peers without the syndrome because their bodies have less muscle and tend to burn fewer calories.

Frequently Asked Questions

Do diet medications work for the appetite problem in PWS?

Unfortunately, no appetite suppressant has worked consistently for people with PWS, but there are currently some promising drug studies. Most require an extremely low-calorie diet all their lives and must have their environment designed so that they have very limited access to food. For example, many families have to lock the kitchen or the cabinets and refrigerator. As adults, most affected individuals can control their weight best in a supportive living home designed specifically for people with PWS, where food access can be restricted without interfering with the rights of those who don’t need such restriction.

Does early diagnosis help?
Early diagnosis of Prader-Willi syndrome gives parents time to learn about and prepare for the challenges that lie ahead and to establish family routines that will support their child’s diet and behavior needs from the start. Knowing the cause of their child’s developmental delays can facilitate a family’s access to important early intervention services and may help program staff identify areas of specific need or risk. Additionally, a diagnosis of PWS opens the doors to a network of information and support from professionals and other families who are dealing with the syndrome.

Is PWS inherited?
Most cases of PWS are attributed to a spontaneous genetic error that occurs at or near the time of conception for unknown reasons. In a very small percentage of cases (2 percent or less), a genetic mutation that does not affect the parent is passed on to the child, and in these families more than one child may be affected. A PWS-like disorder can also be acquired after birth if the hypothalamic portion of the brain is damaged through injury or surgery. All families with a child diagnosed with PWS should see a geneticist for genetic counseling in order to fully understand their chances of having another child with PWS.

What is known about the genetic abnormality?
Basically, the occurrence of PWS is due to lack of several genes on one of an individual’s two chromosome 15s— the one normally contributed by the father. In the majority of cases, there is a deletion—the critical genes are somehow lost from the chromosome. In most of the remaining cases, the entire chromosome from the father is missing and there are instead two chromosome 15s from the mother (uniparental disomy). The critical paternal genes lacking in people with PWS have a role in the regulation of appetite. This is an area of active research in a number of laboratories around the world, since understanding this defect may be very helpful not only to those with PWS but to understanding obesity in otherwise normal people.

Does overeating with PWS begin at birth?
No. In fact, newborns with PWS often cannot get enough nourishment because low muscle tone impairs their sucking ability. Many require special feeding techniques or tube feeding for several months after birth, until muscle control improves. Sometime in the following years, usually before school age, children with PWS develop an intense interest in food and can quickly gain excess weight if calories are not restricted.

What causes the appetite and obesity problem in PWS?
People with PWS have a flaw in the hypothalamus part of their brain, which normally registers feelings of hunger and satiety. While the problem is not yet fully understood, it is apparent that people with this flaw never feel full; they have a continuous urge to eat that they cannot learn to control. To compound this problem, people with PWS need less food than their peers without the syndrome because their bodies have less muscle and tend to burn fewer calories.

How common is PWS?
It is estimated that one in 12,000 to 15,000 people has PWS. Although considered a “rare” disorder, Prader-Willi syndrome is one of the most common conditions seen in genetics clinics and is the most common genetic cause of obesity that has been identified. PWS is found in people of both sexes and all races.

How is PWS diagnosed?
Suspicion of the diagnosis is first assessed clinically, then confirmed by specialized genetic testing on a blood sample. Please see the Getting Tested section below for information on the types of testing.

What does the future hold for people with PWS?
With help, people with PWS can expect to accomplish many of the things their “normal” peers do—complete school, achieve in their outside areas of interest, be successfully employed, even move away from their family home. They do, however, need a significant amount of support from their families and from school, work, and residential service providers to both achieve these goals and avoid obesity and the serious health consequences that accompany it. Even those with IQs in the normal range need lifelong diet supervision and protection from food availability.

Although in the past many people with PWS died in adolescence or young adulthood, prevention of obesity can enable those with the syndrome to live a normal lifespan. New medications, including psychotropic drugs and synthetic growth hormone, are already improving the quality of life for some people with PWS. Ongoing research offers the hope of new discoveries that will enable people affected by this unusual condition to live more independent lives.

What kind of behavior problems do people with PWS have?
In addition to their involuntary focus on food, people with PWS tend to have obsessive/compulsive behaviors that are not related to food, such as repetitive thoughts and verbalizations, collecting and hoarding of possessions, picking at skin irritations, and a strong need for routine and predictability. Frustration or changes in plans can easily set off a loss of emotional control in someone with PWS, ranging from tears to temper tantrums to physical aggression. While psychotropic medications can help some individuals, the essential strategies for minimizing difficult behaviors in PWS are careful structuring of the person’s environment and consistent use of positive behavior management and support.

Getting Tested

Prader-Willi syndrome (PWS) is diagnosed using a series of very specialized genetic tests which are ordered specifically to diagnose this condition. Common chromosome tests, like a karyotype, do NOT reliably detect the genetic changes of PWS. The physical examination and history are very important parts of making the diagnosis, and should be done before genetic testing.

Genetic tests for PWS can be expensive and may require sending samples to specialized laboratories; blood samples (sometimes saliva) are often mailed by the blood drawing lab to such specialized labs. Be certain that your insurance company has approved any test prior to having it done.

DNA Methylation Testing – The BEST INITIAL TEST

All persons suspected of having PWS should be tested with a DNA methylation analysis. This test detects nearly all (>99%) cases of PWS. (It also detects Angelman syndrome which involves the same region of chromosome 15. This test may be called “Prader-Willi/Angelman DNA methylation Panel”). There are 3 major genetic changes that can cause PWS (sometimes called molecular class or genetic subtypes), and all 3 types will have a positive DNA methylation analysis for PWS.

FISH Historically, this test was often used after a positive DNA methylation test to determine whether the individual has the deletion subtype of PWS (the most common). It is not the best first test, as it will not detect the two other subtypes of PWS. Even if this test is negative, the individual could still have PWS.

Chromosome Microarray Chromosome microarray (CMA) testing is a relatively new test, but becoming the test of choice to detect most chromosome deletions, even many small “atypical” sizes, and it will also detect many cases of uniparental disomy 15 (UPD), another genetic subtype of PWS. It does not detect all cases of PWS and specifically those with imprinting defects.

Uniparental disomy (UPD) and imprinting defect testing This is a specialized DNA test that usually requires blood from the patient and both parents for accurate interpretation.

  • A positive DNA methylation test result is >99% accurate proof that the individual has PWS 
  • A negative methylation test result means that the individual almost certainly DOES NOT have PWS

Families and Providers:

Resources listed on this website are provided for informational purposes only. PWSA of Wisconsin, Inc. does not endorse any particular therapy or provider. Be sure to talk with a trusted physician about what interventions and approaches are most appropriate for your child or person with PWS in your care.

PWSA of Wisconsin, Inc. | 38 S Main Street #226 | Oconomowoc, WI 53066 | (920) 733-3077 | progdir@pwsaofwi.org

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