Synonyms
Short Description or Definition
Joubert syndrome (JS) is a rare neurodevelopmental disorder defined principally by abnormalities of the cerebellum and brain stem (Kroes et al., 2011; Maria, Boltshauser, Palmer, & Tran, 1999; Parisi, 2009). In addition to classic JS, a number of syndromes which all exhibit the “molar tooth sign” (MTS) on brain imaging are subsumed under the term Joubert Syndrome and Related Disorders (JSRD) and include COACH syndrome (with colobomas, hepatic fibrosis), Senior-Loken syndrome (with kidney disease), Dekaban-Arima syndrome, Varadi-Papp syndrome, and Malta syndrome.
Categorization
JSRD can be classified into six phenotypic subgroups: pure JS, JS with ocular defect, JS with renal defect, JS with oculorenal defects, JS with hepatic defect, and JS with orofaciodigital defects. The JSRD have been considered autosomal recessive based on recurrence risks around 25% and a 1:1 male to female ratio.
Epidemiology
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References and Readings
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Websites: Joubert Syndrome & Related Disorders Foundation (www.joubertfoundation.com)
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Farmer, J., Miles, J.H., Takahashi, N. (2013). Joubert Syndrome. In: Volkmar, F.R. (eds) Encyclopedia of Autism Spectrum Disorders. Springer, New York, NY. https://doi.org/10.1007/978-1-4419-1698-3_1088
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DOI: https://doi.org/10.1007/978-1-4419-1698-3_1088
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