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TCN1
TCN1 encodes the protein haptocorrin, also known as transcobalamin I, which binds vitamin B12 (cobalamin) in the saliva and protects it from degradation in the acidic environment of the stomach. This initial binding allows B12 to reach the small intestine, where it is then transferred to intrinsic factor for absorption. Variants in the TCN1 gene may affect the stability or availability of B12 in the digestive tract, potentially contributing to suboptimal B12 status. Although not directly involved in cellular B12 transport like TCN2, TCN1 plays a critical early role in vitamin B12 handling.
Description
What is the role of the TCN1 gene?
TCN1 encodes haptocorrin, a protein that binds and protects vitamin B12 in the stomach, aiding its delivery to the small intestine for absorption.
How does TCN1 affect vitamin B12 status?
Variants in TCN1 may impair the ability to bind or protect B12 efficiently, potentially influencing total B12 levels in the body.
Is TCN1 involved in cellular uptake of B12?
No, TCN1 is involved in the initial transport of B12 through the digestive tract, while TCN2 is responsible for delivering B12 into cells.
Can TCN1 polymorphisms lead to symptoms of B12 deficiency?
Indirectly, yes. If B12 is not properly protected or transported early in the digestive process, it may lead to reduced availability and symptoms such as fatigue or neurological issues.
