Smith Magenis Syndrome
National Organization for Rare Disorders, Inc.
It is possible that the main title of the report Smith Magenis Syndrome is not the name you expected. Please check the synonyms listing to find the alternate name(s) and disorder subdivision(s) covered by this report.
- chromosome 17, interstitial deletion 17p
- Smith-Magenis chromosome region
- Chromosome 17p11.2 deletion syndrome
Smith-Magenis syndrome (SMS) is a complex developmental disorder that affects multiple organ systems of the body. The disorder is characterized by a pattern of abnormalities that are present at birth (congenital) as well as behavioral and cognitive problems. Common symptoms include distinctive facial features, skeletal malformations, varying degrees of intellectual disability, speech and motor delays, sleep disturbances, and self-injurious or attention-seeking behaviors. The specific symptoms present in each case can vary dramatically from one individual to another. Approximately 90% of cases are caused when a portion of chromosome is missing or deleted (monosomic). This deleted portion within chromosome 17p11.2 includes the RAI1 gene, which is believed to play a major role in the development of the disorder. Other genes within the deleted segment may also play a role in variable features in the syndrome, but it is not fully understood how significant a role they play in the development of SMS. In the remaining cases, there is no deleted material on chromosome 17; these cases are caused by mutations in the RAI1 gene.
Smith-Magenis syndrome was first reported in the medical literature in 1982 by Ann Smith, a genetic counselor, and colleagues. In 1986, Smith and Dr. R. Ellen Magenis identified nine patients with the disorder further delineating the syndrome. Since that time numerous additional cases have been identified allowing physicians/clinicians to develop a better understanding about this complex disorder.
1825 K Street NW, Suite 1200
Washington, DC 20006
Chromosome Disorder Outreach, Inc.
P.O. Box 724
Boca Raton, FL 33429-0724
PRISMS (Parents & Researchers Interested in Smith-Magenis Syndrome)
21800 Town Center Plaza
Sterling, VA 20164
American Society for Deaf Children
800 Florida Avenue NE
Washington, DC 20002-3695
Smith-Magenis Syndrome Foundation
London, WC1 N3XX
Genetic and Rare Diseases (GARD) Information Center
PO Box 8126
Gaithersburg, MD 20898-8126
PO Box 241956
Los Angeles, CA 90024
Taylor Bug Kisses Foundation (Deleted)
2218 Boulder Dr.
Normal, IL 61761
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It is possible that the title of this topic is not the name you selected. Please check the Synonyms listing to find the alternate name(s) and Disorder Subdivision(s) covered by this report
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Last Updated: 8/13/2014
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