Find sites offering information, advice and assistance. Huntington's disease affects muscle coordination and is caused by a faulty gene on chromosome 4. This gene produces a protein called Huntingtin that can lead to damage of the nerve cells in the brain. Children of parent that have Huntington's disease have a 50-50 chance of inheriting the gene. Huntington's disease symptoms are abnormal or disabling body movements called chorea and can result in a severe lack of coordination. Find official and unofficial Huntington's disease facts, symptoms diagnosis, treatment and causes details listed in the sites below and click on the individual titles to visit each website.