GeneReviews(®)

GeneReviews(®)

Book. 1993

Authors: Pagon RA, Adam MP, Ardinger HH, Wallace SE, Amemiya A, Bean LJH, Bird TD, Fong CT, Mefford HC, Smith RJH, Stephens K

Abstract
CLINICAL CHARACTERISTICS: Virtually all individuals with Woodhouse-Sakati syndrome (WSS) have the endocrine findings of hypogonadism (evident at puberty) and progressive childhood-onset hair thinning that often progresses to alopecia totalis in adulthood. More than half of individuals have the neurologic findings of progressive extrapyramidal movements (dystonic spasms with dystonic posturing with dysarthria and dysphagia), moderate bilateral post-lingual sensorineural hearing loss, and mild intellectual disability. To date 32 families (including 23 with a molecularly confirmed diagnosis) with a total of 76 affected individuals have been reported.
DIAGNOSIS/TESTING: The diagnosis is established in a proband with suggestive clinical findings and by identification of biallelic pathogenic variants in DCAF17 (formerly known as C2orf37) on molecular genetic testing.
MANAGEMENT: Treatment of manifestations: Treatment is symptomatic and should be managed by a multidisciplinary team. Hypogonadism requires hormone replacement therapy to induce secondary sex characteristics and promote bone health at the usual age of puberty. Alopecia is treated symptomatically for cosmetic reasons only. Treatment for dystonia is routine; oral medications are tried first and followed in some instances by botulinum toxin injection and/or deep-brain stimulation. Dysarthria often benefits from consultation with a speech therapist. Those with dysphagia often require measures to reduce oral secretions, use of thickened liquids and pureed foods to avoid aspiration, and eventually a gastrostomy to help maintain caloric intake. Hearing loss, intellectual disability, diabetes mellitus, and hypothyroidism are treated as per routine. Surveillance: Monitoring for endocrine abnormalities is recommended at the following ages: hypogonadism (12-14 years), diabetes mellitus (in the 20s or later), hypothyroidism (in the 20s or later). Neurologic manifestations should be monitored by a neurologist as well as experts in rehabilitative medicine, speech, and swallowing. Hearing should be monitored annually. Agents/circumstances to avoid: Persons with dystonia should avoid situations in which the risk of falling is increased. Evaluation of relatives at risk: Molecular genetic testing for the DCAF17 pathogenic variants identified in the proband is appropriate for evaluation of apparently asymptomatic older and younger sibs to identify, as early as possible, those who would benefit from early identification and treatment of potential complications.
GENETIC COUNSELING: WSS is inherited in an autosomal recessive manner. At conception, each sib of an affected individual has a 25% chance of being affected, a 50% chance of being an asymptomatic carrier, and a 25% chance of being unaffected and not a carrier. Once the pathogenic DCAF17 variants have been identified in an affected family member, carrier testing for at-risk relatives, prenatal testing for a pregnancy at increased risk, and preimplantation genetic diagnosis are possible options.

PMID: 27489925

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