What’s In a Gene?
What is the TTR gene… and what does V122I actually do?
Let’s break this down simple, Fam.
Your body has thousands of genes.
A gene is a set of instructions.
One of those genes is called TTR.
The TTR gene gives instructions to your liver to make a protein called transthyretin.
That protein has an important job. It carries:
• Thyroid hormone (thyroxine), which helps control energy and metabolism
• Vitamin A (retinol), which supports vision and other body functions
Normally, four transthyretin proteins attach together to form one stable unit. When they stay together, they work the way they are supposed to.
Now here is where V122I matters.
If someone inherits the V122I change in the TTR gene, the protein that gets made is slightly different from the start.
That small difference makes the four-protein unit less stable.
Over time, that unit can break into single proteins.
Those single proteins can lose their normal shape.
When that happens, they can stick to other misfolded proteins.
When enough of those proteins stick together, they form amyloid deposits.
Those deposits can build up in organs, especially the heart.
When amyloid builds up in the heart muscle, it can make the heart stiff.
That stiffness is what can lead to symptoms later in life.
Important to understand:
Having the V122I gene change does NOT mean
• You are automatically sick
• You will definitely develop disease
• Your children will definitely develop disease
It means the protein has a higher chance of becoming unstable over many years.
If one parent carries the V122I change, each child has a 50 percent chance of inheriting that same gene change.
That is genetics. Not fate.
We all pass down genes. That is how families are built.
We pass down height.
We pass down traditions.
We pass down stories.
Sometimes we also pass down small differences in our genes.
Gene differences are common. Some do not affect health, and some can raise risk for certain conditions later in life.
The V122I change is one of those differences.
Knowing about it is not blame.
It is not shame.
It is information.
And information helps families protect the next generation.
For the Culture. For the Future.
From my personal experience learning about the TTR gene and the V122I variant, I found that understanding these genetic details can be empowering rather than frightening. The V122I change, a variant in the TTR gene common in certain communities, slightly alters the transthyretin protein, making it less stable over time. This instability can lead to amyloid deposits that affect vital organs such as the heart, potentially causing symptoms in later life. However, inheriting this gene change does not guarantee illness – it only increases the risk, emphasizing the importance of regular health monitoring and open family discussions. I remember when my family first learned about this gene variant; it sparked conversations about family health history that we had never fully explored. Sharing this information enabled us to support each other better and prompted us to consult healthcare professionals for appropriate testing and guidance. Understanding that children have a 50% chance of inheriting this gene from a parent helped us appreciate the significance of early genetic awareness. It’s also important to realize that genetics is not destiny. Lifestyle factors, medical advancements, and early detection can all influence health outcomes. Engaging with support communities and educational resources, like those tagged with #hATTRNextGen and #KnowYourRoots, provides valuable connection and information. For anyone discovering they carry the V122I variant, my advice is to view this as important information—not a burden. Being informed enables proactive choices to protect your health and your family’s future. Taking the time to learn about how the TTR gene works, discussing it openly, and seeking medical advice create a foundation for managing risks and promoting well-being across generations.