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  • A polymorphic disorder with characteristics of ataxia, sensorineural deafness and narcolepsy with cataplexy and dementia. Disease onset occurs in adulthood from the ages of 30-40. Mild brain atrophy with cerebellum involvement is visible with magnetic resonance imaging. Caused by a mutation in the DNA methyltransferase (DNMT1) gene located on chromosome 19p13.2. It encodes an enzyme essential for the repression of transcriptional activity in numerous postmitotic cells.
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