Fibrin (also called Factor Ia) is a fibrous protein involved in the clotting of blood, and is non globular. It is a fibrillar protein that is polymerised to form a "mesh" that forms a hemostatic plug or clot (in conjunction with platelets) over a wound site.
Fibrin is made from fibrinogen, a soluble plasma glycoprotein that is synthesised by the liver.
Excessive generation of fibrin due to activation of the coagulation cascade leads to thrombosis, while ineffective generation or premature lysis of fibrin predisposes to hemorrhage.
Dysfunction or disease of the liver can lead to a decrease in fibrinogen production or the production of abnormal fibrinogen molecules with reduced activity (dysfibrinogenaemia). Hereditary abnormalities of fibrinogen (the gene is carried on chromosome 4) are of both quantitative and qualitative in nature and include; afibrinogenaemia, hypofibrinogenaemia, dysfibrinogenaemia, and hypodysfibrinogenaemia.
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