Factor VII deficiency: Year of the Zebra 2026

Factor VII deficiency is a rare bleeding disorder in which the body, specifically the liver, doesn’t produce enough functional factor VII.

During coagulation, a group of specialized proteins known as clotting factors activate one another in a rapid chain reaction called the coagulation cascade.

Each clotting factor passes the signal on to the next one, eventually activating thrombin, which converts fibrinogen into fibrin.

Then, fibrin combines with itself many times, forming a mesh around the platelet plug that seals the injured vessel and creates a stable clot.

To prevent clots from forming unnecessarily, the coagulation cascade stays mostly inactive while blood vessels remain intact.

One important safeguard is tissue factor, a protein that’s normally hidden within the vessel walls.

When a blood vessel is damaged, tissue factor becomes exposed to the bloodstream.

As a result, circulating factor VII binds to the exposed tissue factor, forming a complex that starts the coagulation cascade.

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In factor VII deficiency, this first step doesn’t work as efficiently as it should, making it harder for the body to form stable clots and stop bleeding.

Most cases occur because of inherited mutations in the F7 gene, which codes for factor VII. The disorder usually follows an autosomal recessive inheritance pattern, meaning a person must inherit two altered copies of the gene, one from each parent, to develop the condition.

Rarely, factor VII deficiency can be acquired later in life due to conditions like severe liver disease.

Clinically, individuals with factor VII deficiency have an increased risk of bleeding, though the severity varies widely. Newborns may present with bleeding from the umbilical stump or after procedures such as circumcision.

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Children and adults might notice frequent nosebleeds,

easy bruising,