This table lists symptoms that people with this disease may have. For most diseases, symptoms will vary from person to person. People with the same disease may not have all the symptoms listed. This information comes from a database called the Human Phenotype Ontology (HPO) . The HPO collects information on symptoms that have been described in medical resources. The HPO is updated regularly. Use the HPO ID to access more in-depth information about a symptom.
|Medical Terms||Other Names||
|80%-99% of people have these symptoms|
Absent speech development
Lack of language development
Lack of speech
No speech development
No speech or language development
Wide based walk
|Cerebral cortical atrophy||0002120|
Mental retardation, progressive
Progressive mental retardation
|Intellectual disability, severe||
Early and severe mental retardation
Mental retardation, severe
Severe mental retardation
|30%-79% of people have these symptoms|
|Hypoplasia of the maxilla||
Decreased size of maxilla
Decreased size of upper jaw
|Widely spaced teeth||
|5%-29% of people have these symptoms|
|Percent of people who have these symptoms is not available through HPO|
|Deeply set eye||
Deep set eye
Outward facing eye ball
Fair hair color
Flaxen hair color
Light colored hair
Sandy hair color
Straw colored hair
Towhead (hair color)
|Feeding difficulties in infancy||0008872|
Decreased muscle tone
Low muscle tone
|Hypopigmentation of the skin||
Patchy lightened skin
Involuntary shaking of limb
|Paroxysmal bursts of laughter||0000749|
|Progressive gait ataxia||0007240|
Tongue sticking out of mouth
|Sleep-wake cycle disturbance||0006979|
Several different genetic mechanisms can inactivate or delete the maternal copy of the UBE3A gene. Most cases of Angelman syndrome occur when a segment of the maternal
In a small percentage of cases, a person with Angelman syndrome inherits two copies of chromosome 15 from his or her father, instead of one copy from each parent. This is called paternal uniparental disomy. Rarely, Angelman syndrome can also be caused by a chromosomal rearrangement called a
Making a diagnosis for a genetic or rare disease can often be challenging. Healthcare professionals typically look at a person’s medical history, symptoms, physical exam, and laboratory test results in order to make a diagnosis. The following resources provide information relating to diagnosis and testing for this condition. If you have questions about getting a diagnosis, you should contact a healthcare professional.
The resources below provide information about treatment options for this condition. If you have questions about which treatment is right for you, talk to your healthcare professional.
Research helps us better understand diseases and can lead to advances in diagnosis and treatment. This section provides resources to help you learn about medical research and ways to get involved.
Support and advocacy groups can help you connect with other patients and families, and they can provide valuable services. Many develop patient-centered information and are the driving force behind research for better treatments and possible cures. They can direct you to research, resources, and services. Many organizations also have experts who serve as medical advisors or provide lists of doctors/clinics. Visit the group’s website or contact them to learn about the services they offer. Inclusion on this list is not an endorsement by GARD.
Living with a genetic or rare disease can impact the daily lives of patients and families. These resources can help families navigate various aspects of living with a rare disease.
These resources provide more information about this condition or associated symptoms. The in-depth resources contain medical and scientific language that may be hard to understand. You may want to review these resources with a medical professional.
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How is Anglemans syndrome mistaken for Autism? See answer
We have a 2-year-old son who was diagnosed with Angelman syndrome. He has a deletion of the mother's part on chromosome 15. What are the chances of this syndrome occurring in our next baby? We have another 6-year-old son who is normal. See answer
What is the chance of having another child with Angelman syndrome if a mother has a translocation of chromosomes 15 and 7? Is there additional genetic testing that could be performed? See answer