Hereditary ATTR (hATTR) amyloidosis—a family condition
hATTR amyloidosis is passed down through family members and is an autosomal dominant condition, meaning a person only needs to inherit one copy of the affected gene from one parent in order to develop the condition.
More than 120 different TTR gene mutations have been discovered
- Genetic diseases such as hATTR amyloidosis are more common in specific populations. African American, Brazilian, French, Irish, Japanese, Portuguese, and Swedish ethnicities are more likely to have certain TTR gene mutations
- The most common mutations in the US are Val122Ile, Thr60Ala, and Val30Met
Genes are located on structures known as chromosomes. Every individual has two copies of the TTR gene, one inherited from each parent. When one parent carries an autosomal dominant mutation, any child will have a 50% chance of inheriting that mutation.
A family member may inherit the TTR gene with a mutation, but having the mutation does not mean that he or she will develop hATTR amyloidosis.
We’re a very close family, we share everything…if there’s a new symptom, we all want to know about it.—Sandie
Symptoms may vary widely among individuals with hATTR amyloidosis
Within your family, each individual who develops the condition may experience different symptoms, even if he or she has the same mutation.
Although hATTR amyloidosis is a hereditary condition, some families may be unaware of a history of the condition in their family.