Amelocerebrohypohidrotic syndrome

Amelocerebrohypohidrotic syndrome, also known as Kohlschütter-Tönz syndrome (KTS), is a rare neurodegenerative disorder characterized by the combination of amelogenesis imperfecta (yellow-brown discoloration and abnormal enamel formation of the teeth), epilepsy, and intellectual disability. The condition was first described by Kohlschütter and colleagues in 1974. It primarily affects the central nervous system, teeth, and sweat glands (with reduced sweating or hypohidrosis being a variable feature). The syndrome typically presents in infancy or early childhood with seizures that may be difficult to control, progressive psychomotor regression or developmental delay, and characteristic dental enamel defects known as amelogenesis imperfecta, which gives the teeth a distinctly abnormal yellow-brown appearance. The condition is caused by mutations in the ROGDI gene (also referred to as leucine zipper-containing protein), located on chromosome 16p13.3. The ROGDI protein is believed to play a role in neuronal function, though its precise biological mechanism is not yet fully understood. The epilepsy associated with this syndrome can be severe and often refractory to standard antiepileptic medications. Affected individuals typically experience progressive cognitive decline and spasticity over time. There is currently no cure or disease-specific treatment for Kohlschütter-Tönz syndrome. Management is supportive and symptomatic, focusing on seizure control with antiepileptic drugs, dental care and restorative treatments for enamel defects, physical therapy, and developmental support. The prognosis varies but is generally guarded, with many patients experiencing significant neurological deterioration. Early diagnosis through clinical recognition of the triad of epilepsy, intellectual disability, and amelogenesis imperfecta, combined with genetic testing for ROGDI mutations, is important for appropriate management and genetic counseling.

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