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Diseases

Genetic and Rare Diseases Information Center (GARD)

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Autism spectrum disorders

*

* Not a rare disease

Other Names for this Disease

  • ASD
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

Can Landau-Kleffner syndrome and autism be diagnosed by genetic testing?

Our Answer

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

Is genetic testing available for Landau-Kleffner syndrome (LKS)?

Although families with multiple cases of LKS have been reported in the medical literature, no genes have been associated with LKS.[1] Therefore, genetic testing is not available for this condition. 
Last updated: 12/8/2008

How is Landau-Kleffner syndrome (LKS) diagnosed?

LKS is diagnosed based on clinical features and the results of an electroencephalogram (EEG), a recording of the electric activity of the brain. All LKS children have abnormal electrical brain activity on both the right and left sides of their brains.[2]
Last updated: 12/8/2008

Is genetic testing available for autism spectrum disorders (ASD)?

Genetic testing can determine the cause of some cases of ASD. Currently, a genetic cause can be identified in 20% to 25% of children with ASD. The cause of ASD in the remaining 75% to 80% remains unknown. Genetic testing can help determine if a person has ASD caused by a chromosome abnormality or a single-gene disorder. Large chromosome abnormalities have been seen in about 5% of those with ASD; smaller deletions or duplications of genetic material has been found in about 10-20%; single gene disorders have been found in about 5% of those with ASD. Despite intensive research, no specific gene has been solely associated with ASD.[3]

GeneTests lists the names of laboratories that are performing genetic testing for ASD. To view the contact information for the clinical laboratories conducting testing, click here

Please note:  Most of the laboratories listed through GeneTests do not accept direct contact from patients and their families; therefore, if you are interested in learning more, you will need to work with a health care provider or a genetics professional. 
Last updated: 10/19/2011

References
Other Names for this Disease
  • ASD
See Disclaimer regarding information on this site. Some links on this page may take you to organizations outside of the National Institutes of Health.