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Huntington's disease (HD) is an autosomal dominant genetic disorder, meaning that individuals with one copy of the mutated gene will develop the disease. There are no true "carrier forms" of HD, as those who carry the mutated gene will eventually manifest symptoms, typically in mid-adulthood. However, individuals can be asymptomatic for a period, but they still possess the gene and can pass it on to their offspring. Lethal forms of HD are not recognized; rather, the disease progresses over time, leading to severe disability and ultimately death, often 15 to 20 years after the onset of symptoms.

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