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Smith-Magenis syndrome.

Sarah H Elsea1, Santhosh Girirajan

  • 1Department of Pediatrics, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, VA 23298, USA. selsea@vcu.edu

European Journal of Human Genetics : EJHG
|January 31, 2008
PubMed
Summary
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Smith-Magenis syndrome (SMS) is a neurobehavioral disorder linked to the RAI1 gene. Diagnosis involves genetic testing for deletions or mutations, with management focusing on a multidisciplinary approach.

Area of Science:

  • Genetics
  • Neurobiology
  • Molecular Biology

Background:

  • Smith-Magenis syndrome (SMS) is a complex neurobehavioral disorder.
  • It is caused by haploinsufficiency of the retinoic acid-induced 1 (RAI1) gene located on chromosome 17p11.2.

Purpose of the Study:

  • To outline diagnostic strategies for Smith-Magenis syndrome.
  • To discuss the genetic basis and management of SMS.

Main Methods:

  • Classical cytogenetic methods like G-banding and FISH for detecting 17p11.2 microdeletions.
  • Molecular techniques such as multiplex ligation-dependent probe amplification (MLPA) and real-time quantitative PCR for cost-effective, high-throughput genetic analysis.
  • Identification of deletions encompassing RAI1 or mutations within the RAI1 gene.

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Main Results:

  • Most SMS features result from RAI1 haploinsufficiency.
  • Variability and severity of SMS are influenced by other genes within the 17p11.2 region.
  • The precise functional role of RAI1 is under investigation, with evidence suggesting involvement in transcription.

Conclusions:

  • Accurate diagnosis of SMS relies on molecular identification of RAI1 alterations.
  • Management requires a multidisciplinary approach addressing sleep, speech, occupational, and behavioral issues.
  • Further research is needed to fully elucidate the functional role of RAI1.