What is the main risk factor for developing Huntington's disease?

• A. Age-related degeneration
• B. Genetic inheritance of the mutated HTT gene
• C. Environmental toxins exposure
• D. Viral infections in childhood

Answer: (B)

Huntington's disease is primarily caused by a genetic mutation in the HTT gene, which is responsible for producing the huntingtin protein. This mutation leads to the production of an abnormal version of the protein that gradually causes the degeneration of neurons in certain areas of the brain, particularly those involved in movement and cognitive function. The disease follows an autosomal dominant inheritance pattern, meaning that only one copy of the mutated gene inherited from a parent is necessary for an individual to develop the disorder.

The presence of the mutated HTT gene poses the highest risk factor for developing Huntington's disease, regardless of other factors. While age-related degeneration and environmental influences may play roles in various neurological conditions, they are not direct risk factors for Huntington's. Similarly, childhood viral infections do not have a recognized link to the development of this specific genetic disorder. Understanding the clear genetic basis of Huntington's disease underscores the significance of the HTT gene mutation as the primary risk factor.