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Congenital hypofibrinogenemia is a rare di … Congenital hypofibrinogenemia is a rare disorder in which one of the three genes responsible for producing fibrinogen, a critical blood clotting factor, is unable to make a functional fibrinogen glycoprotein because of an inherited mutation. In consequence, liver cells, the normal site of fibrinogen production, make small amounts of this critical coagulation protein, blood levels of fibrinogen are low, and individuals with the disorder may develop a coagulopathy, i.e. a diathesis or propensity to experience episodes of abnormal bleeding. However, individuals with congenital hypofibringenemia may also have episodes of abnormal blood clot formation, i.e. thrombosis. This seemingly paradoxical propensity to develop thrombosis in a disorder causing a decrease in a critical protein for blood clotting may be due to the function of fibrin (the split product of fibrinogen that is the basis for forming blood clots) to promote the lysis or disintegration of blood clots. Lower levels of fibrin may reduce the lysis of early fibrin strand depositions and thereby allow these depositions to develop into clots. Congenital hypofibrinogenemia must be distinguished from: a) congenital afibrinogenemia, a rare disorder in which blood fibrinogen levels are either exceedingly low or undetectable due to mutations in both fibrinogen genes; b) congenital hypodysfibrinogenemia, a rare disorder in which one or more genetic mutations cause low levels of blood fibrinogen, at least some of which is dysfunctional and thereby contributes to excessive bleeding; and c) acquired hypofibrinogenemia, a non-hereditary disorder in which blood fibrinogen levels are low because of e.g. severe liver disease or because of excessive fibrinogen consumption resulting from, e.g. disseminated intravascular coagulation. Certain gene mutations causing congenital hypfibrinogenemia disrupt the ability of liver cells to secrete fibrinogen. In these instances, the un-mutated gene maintains blood fibrinogen at reduce levels but the mutated gene produces a fibrinogen that accumulates in liver cells sometimes to such extents that it becomes toxic. In the latter cases, liver disease may ensue in a syndrome termed fibrinogen storage disease.yndrome termed fibrinogen storage disease.
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Congenital hypofibrinogenemia is a rare di … Congenital hypofibrinogenemia is a rare disorder in which one of the three genes responsible for producing fibrinogen, a critical blood clotting factor, is unable to make a functional fibrinogen glycoprotein because of an inherited mutation. In consequence, liver cells, the normal site of fibrinogen production, make small amounts of this critical coagulation protein, blood levels of fibrinogen are low, and individuals with the disorder may develop a coagulopathy, i.e. a diathesis or propensity to experience episodes of abnormal bleeding. However, individuals with congenital hypofibringenemia may also have episodes of abnormal blood clot formation, i.e. thrombosis. This seemingly paradoxical propensity to develop thrombosis in a disorder causing a decrease in a critical protein for blood clecrease in a critical protein for blood cl
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