Dementia due to Down syndrome (Q40245): Difference between revisions

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Latest revision as of 05:58, 13 August 2026

Dementia due to Down syndrome is a neurodegenerative disorder related to the impact of abnormal increased production and accumulation of amyloid precursor protein (APP) leading to formation of beta-amyloid plaques and tau tangles. APP gene expression is increased due to its location on chromosome 21, which is abnormally triplicated in Down syndrome. Cognitive deficits and neuropathological features are similar to those observed in Alzheimer disease. Onset is typically after the fourth decade of life with a gradual decline in functioning, and may impact 50% or more of individuals with Down syndrome.

Language	Label	Description	Also known as
default for all languages	6D85.9
English	Dementia due to Down syndrome	Dementia due to Down syndrome is a neurodegenerative disorder related to the impact of abnormal increased production and accumulation of amyloid precursor protein (APP) leading to formation of beta-amyloid plaques and tau tangles. APP gene expression is increased due to its location on chromosome 21, which is abnormally triplicated in Down syndrome. Cognitive deficits and neuropathological features are similar to those observed in Alzheimer disease. Onset is typically after the fourth decade of life with a gradual decline in functioning, and may impact 50% or more of individuals with Down syndrome.