Cause
Huntington’s disease: a genetic disorder
Huntington’s disease is caused by a gene defect located in the Huntingtin gene chromosome 4. The defective gene causes the slow, progressive death of nerve cells in the brain. These changes are responsible for the various symptoms of the hereditary, autosomal dominant disease. Autosomal dominant means that only one parent needs to possess the abnormal gene in order for the child to have a 50% risk of inheriting the defective gene. Whoever possesses the defective gene will become sick sooner or later.