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Huntingtin (Htt) is the protein coded for in humans by the HTT gene, also known as the IT15 ("interesting transcript 15") gene. [5] Mutated HTT is the cause of Huntington's disease (HD), and has been investigated for this role and also for its involvement in long-term memory storage.
The area of the brain most damaged in early Huntington's disease is the dorsal striatum made up of the caudate nucleus and the putamen. Initially, damage to the brain is regionally specific with the dorsal striatum in the subcortical basal ganglia being primarily affected, followed later by cortical involvement in all areas.
Huntington's disease (HD) is an inherited disorder that causes progressive degeneration of neurons within the cerebral cortex and striatum of the brain [98] resulting in loss of motor functions (involuntary muscle contractions), decline in cognitive ability (eventually resulting in dementia), and changes in behavior.
These often are translated into polyglutamine-containing proteins that form inclusions and are toxic to neuronal cells. Examples of the disorders caused by this mechanism include Huntington's disease and Huntington disease-like 2, spinal-bulbar muscular atrophy, dentatorubral-pallidoluysian atrophy, and spinocerebellar ataxia 1–3, 6–8, and 17.
Brain cells make up the functional tissue of the brain. The rest of the brain tissue is the structural stroma that includes connective tissue such as the meninges , blood vessels , and ducts. The two main types of cells in the brain are neurons , also known as nerve cells, and glial cells , also known as neuroglia. [ 1 ]
Huntington's disease-like syndromes (HD-like syndromes, or HDL syndromes) are a family of inherited neurodegenerative diseases that closely resemble Huntington's disease (HD) in that they typically produce a combination of chorea, cognitive decline or dementia and behavioural or psychiatric problems.
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Once the number of copies reaches over 100, the disease will manifest earlier in life (although the individual will still reach adulthood before the symptoms are evident) and the symptoms will be more severe – including electrical myotonia. As the number progresses upwards past 400, the symptoms show themselves during childhood or infancy.
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