Your browser does not support javascript:   Search for gard hereSearch for news-and-events here.


Genetic and Rare Diseases Information Center (GARD)

Print friendly version

Angelman syndrome

Other Names for this Disease
  • AS
  • Happy puppet syndrome (formerly)
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.

Your Question

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?

Our Answer

We have identified the following information that we hope you find helpful. If you still have questions, please contact us.

What is the chance of having another child with Angelman syndrome if a mother has a translocation involving chromosome 15?

In about 1 percent of cases, Angelman syndrome is caused by an inherited abnormality in chromosome 15.[1] In these cases, the chance of having another child with Angelman syndrome depends on the specific chromosome abnormality, and could be as high as 50 percent.[1] A genetics professional can provide information on an individual's risk of having another child with Angelman syndrome.
Last updated: 7/28/2009

Is there anything that can be done in order to avoid the continuity of this condition in my family?

Today there are a number of genetic tests that can be used to inform a couple about the possible outcomes of a current or future pregnancy. Examples of two such tests are prenatal diagnosis and preimplantation genetic diagnosis (PGD). Prenatal diagnosis can be used to diagnose a condition in a developing fetus. Today, doctors are able to diagnose many more birth defects than they are able to treat before birth. If a fetus has a condition for which prenatal treatment is not possible, prenatal diagnosis may help parents prepare emotionally for the birth and to plan the delivery with their health care providers.[2] Parents can also use this information to make decisions regarding whether or not to continue the pregnancy. 

PGD represents an alternative to prenatal diagnosis.[3] It is used following in vitro fertilization to diagnose a genetic disease or condition in embryos. Only embryos that do not carry the disease-causing mutation are implanted in the mother's womb. PGD allows testing to occur before a pregnancy begins.

In many cases, the disease-causing mutation must be identified in an affected relative before PGD or prenatal diagnosis can be performed.

You can learn more about these and other tests by visiting the links below to the view information on this topic developed by the Centre for Genetic Education and by the Genetics and Public Policy Center:

Couples considering these options should talk with their healthcare provider and a genetic professional. It is important that couples are fully informed of the risks and benefits of each testing option and also have an opportunity to explore their feelings and beliefs regarding the use of these technologies. More information about genetic consultations is available from Genetics Home Reference at To find a genetics clinic, we recommend that you contact your primary healthcare provider for a referral.

The following online resources can help you find a genetics professional in your community:  

Last updated: 4/14/2011