An abnormal fibrinogen (Copenhagen II) with increased sialic acid content associated with thrombotic tendency and normal liver function

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Abstract
An increased sialic acid content of the fibrinogen molecule is found in foetal fibrinogen and as an acquired disorder in hepatic disease. A qualitatively abnormal fibrinogen was detected in the plasma of a 25-year-old man with a thrombotic tendency. The purified fibrinogen had a significantly increased content of sialic acid, an abnormal fibrin monomer polymerization, and a changed mobility in crossed affinity-immunoelectrophoresis using immobilized helix pomatia lectin. The patient had no biochemical or clinical signs of liver disease. The occurrence of a thrombotic tendency and an increased fibrinogen sialic acid content without signs of liver disease may represent a new variant of congenital dysfibrinogenaemia.

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