Disease or Syndrome
Smith-Magenis syndrome
Subclass of:
Congenital chromosomal disease;
Multiple congenital anomalies;
Chronobiology Disorders
Definitions related to smith-magenis syndrome:
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A genetic syndrome caused by an interstitial deletion in chromosome 17p11.2. It is characterized by mild to moderate mental retardation, distinctive facial features (flat head, square face, and deep set-eyes), sleep disturbances, attention deficit disorders, and temper tantrums.NCI ThesaurusU.S. National Cancer Institute, 2021
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(smith magenis syndrome) A rare chromosomal disorder characterized by abnormalities of the craniofacial area (brachycephaly, prognathism, cleft palate), delays in the acquisition of skills requiring the coordination of mental and muscular activities, mental retardation; most affected individuals experience speech delays that may occur in association with hearing impairment; behavioral abnormalities may include hyperactivity and self-destructive behavior.CRISP ThesaurusNational Institutes of Health, 2006
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Complex neurobehavioral disorder characterized by distinctive facial features (FACIES), developmental delay and INTELLECTUAL DISABILITY. Behavioral phenotypes include sleep disturbance, maladaptive, self-injurious and attention-seeking behaviors. The sleep disturbance is linked to an abnormal circadian secretion pattern of MELATONIN. The syndrome is associated with de novo deletion or mutation and HAPLOINSUFFICIENCY of the retinoic acid-induced 1 protein on chromosome 17p11.2.NLM Medical Subject HeadingsU.S. National Library of Medicine, 2021
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Smith-Magenis syndrome (SMS) is characterized by distinctive physical features (particularly facial features that progress with age), developmental delay, cognitive impairment, behavioral abnormalities, sleep disturbance, and childhood-onset abdominal obesity. Infants have feeding difficulties, failure to thrive, hypotonia, hyporeflexia, prolonged napping or need to be awakened for feeds, and generalized lethargy. The majority of individuals function in the mild-to-moderate range of intellectual disability. The behavioral phenotype, including significant sleep disturbance, stereotypies, and maladaptive and self-injurious behaviors, is generally not recognized until age 18 months or older and continues to change until adulthood. Sensory issues are frequently noted; these may include avoidant behavior, as well as repetitive seeking of textures, sounds, and experiences. Toileting difficulties are common. Significant anxiety is common as are problems with executive functioning, including inattention, distractibility, hyperactivity, and impulsivity. Maladaptive behaviors include frequent outbursts / temper tantrums, attention-seeking behaviors, opposition, aggression, and self-injurious behaviors including self-hitting, self-biting, skin picking, inserting foreign objects into body orifices (polyembolokoilamania), and yanking fingernails and/or toenails (onychotillomania). Among the stereotypic behaviors described, the spasmodic upper-body squeeze or "self-hug" seems to...GeneReviewsUniversity of Washington, 2021
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Smith-Magenis syndrome (SMS) is a developmental disorder that affects many parts of the body. The major features of this condition include mild to moderate intellectual disability, delayed speech and language skills, distinctive facial features, sleep disturbances, and behavioral problems. Most people with SMS have a deletion of genetic...National Center for Advancing Translational Sciences
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