Huntington’s Disease – Causes, Risk Factors, Diagnosis, and More
Huntington’s disease is a rare genetic condition characterized by the progressive degeneration of neurons in the brain’s nerve cells, impacting one’s cognitive and physical abilities. It starts with difficulty in making decisions, recurring depression, mood swings, and finally, severe cases of memory loss, slurred speech, and uncontrollable twitching (chorea). In most cases, the symptoms begin around 30-40, and in rare early-onset or juvenile Huntington’s disease can happen in children below the age of 18. Causes and risk factors Genetic mutation is the only known cause of Huntington’s Disease. The inheritance of the fourth chromosome carries a mutation on the HD gene, huntingtin, a protein necessary for the proper functioning of the neurons. It helps in the storage of long-term memory. This disease is classified under autosomal dominant disorders, wherein an individual is affected when they carry only one copy of the defective chromosome. This means that the affected individual’s children always carry a 50% chance of inheriting this disease. HD has a prevalence range of 3-7 per 100,000 people, more common in people with European ancestry. Even though both genders are equally inheritable to this condition, studies show women experience higher severity of depression and have shown a quicker decline in cognitive and motor abilities.