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lüll Smith-Magenis syndrome Elsea SH; Girirajan SEur J Hum Genet 2008[Apr]; 16 (4): 412-21Smith-Magenis syndrome (SMS) is a complex neurobehavioral disorder caused by haploinsufficiency of the retinoic acid-induced 1 (RAI1) gene on chromosome 17p11.2. Diagnostic strategies include molecular identification of a 17p11.2 microdeletion encompassing RAI1 or a mutation in RAI1. G-banding and fluorescent in situ hybridization (FISH) are the classical methods used to detect the SMS deletions, while multiplex ligation-dependent probe amplification (MLPA) and real-time quantitative PCR are the newer, cost-effective, and high-throughput technologies. Most SMS features are due to RAI1 haploinsufficiency, while the variability and severity of the disorder are modified by other genes in the 17p11.2 region. The functional role for RAI1 is not completely understood, but it is likely involved in transcription, based on homology and preliminary studies. Management of SMS is primarily a multidisciplinary approach and involves treatment for sleep disturbance, speech and occupational therapies, minor medical interventions, and management of behaviors.|Abnormalities, Multiple/diagnosis/*genetics[MESH]|Chromosomes, Human, Pair 17[MESH]|Craniofacial Abnormalities/*genetics[MESH]|Humans[MESH]|Intellectual Disability/*genetics[MESH]|Syndrome[MESH]|Trans-Activators[MESH]|Transcription Factors/genetics[MESH] |