Huntington disease is an autosomal dominant disorder, meaning that a person needs one copy of the defective gene to develop the disorder.

1. Huntington Disease – The Most
Common Hereditary Brain Disorders

2. Huntington disease is an autosomal dominant disorder, meaning that a person
needs one copy of the defective gene to develop the disorder. This altered HTT
gene passes on between generations, being passed down from parent to child.
This disease leads to brain changes causing abnormal involuntary movements,
decreased thinking and reasoning skills, and mood changes such as irritability and
depression.

3. Symptoms of Huntington Disease
Huntington disease is now considered as one of the most common
hereditary brain disorders. It tends to progress over a 10 to 20 year
period, affecting both the basal ganglia and the brain cortex. The basal
ganglia are responsible for controlling coordination.

4. How to test if you
are at risk?
To test if you’re at risk of developing Huntington’s
disease there is a presymptomatic testing done to
measure the number of repeats in the
Huntington’s disease gene. This test is a blood
test and is done on people who do not have any
symptoms of Huntington’s disease.

5. Huntington’s
Genetic Risk Factors
With regards to ethnicity, Huntington’s disease is
less common for those with a Japanese, Chinese,
or African descent. It commonly affects those of
European ancestry, as 3 to 7 per 100,000 people
are affected by Huntington’s disease. This disease
is commonly found in the United States and
Australia.

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