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Huntington disease is a progressive brain disorder that causes uncontrolled movements, emotional problems, and loss of thinking ability (cognition).Adult-onset Huntington disease, the most common form of this disorder, usually appears in a person's thirties or forties.n rare cases, an individual with Huntington disease does not have a parent with the disorder. As the altered HTT gene is passed from one generation to the next, the size of the CAG trinucleotide repeat often increases in size.
An earlier onset form called juvenile HD, occurs under age 20. Symptoms of juvenile HD differ somewhat from adult onset HD and include unsteadiness, rigidity, difficulty at school, and seizures. More than 30,000 Americans have HD. Huntingtonâs disease is caused by a mutation in the gene for a protein called huntingtin. The defect causes the cytosine, adenine, and guanine (CAG) building blocks of DNA to repeat many more times than is normal. Each child of a parent with HD has a 50-50 chance of inheriting the HD gene.