| Disease with characteristics of a variable clinical picture which can include dementia, psychiatric disorders, parkinsonism, dystonia, chorea, spasticity and epilepsy. Worldwide prevalence is unknown. Fewer than 100 families have been reported to date. Clinical features overlap with many neurodegenerative syndromes and specifically Huntington disease. Caused by a CAG repeat expansion in the TATA box-binding protein gene TBP (6q27). Prognosis is poor. More than 60% of patients present with dysphagia which frequently results in aspiration and death. Mean disease duration is less than 18 years and a few patients live beyond 60 years of age. |
