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Case Reports
Journal Article
Hypodysfibrinogenemia with a Heterozygous Mutation of γCys326Ser by the Novel Transversion of TGT to TCT in a Patient with Pulmonary Thromboembolism and Right Ventricular Thrombus.
Cardiology 2017
We encountered a 45-year-old Japanese man who suffered from pulmonary thromboembolism and huge right ventricular thrombus after inferior vena cava (IVC) filter implantation without apparent thrombus in either the deep veins or inside the IVC filter. The biochemical data showed a discrepancy in the level of fibrinogen between the immunological and thrombin time methods, suggesting hypodysfibrinogenemia. The sequencing of the fibrinogen γ-chain gene (FGG) revealed a novel heterozygous missense mutation in exon 8 - a TGT to TCT transversion in codon 326 - resulting in an amino acid substitution of serine for cysteine (γCys326Ser). The characterization of the protein did not show known mechanisms for thrombosis in dysfibrinogenemia, such as dimer or albumin-binding complex formation. In summary, the current case with a life-threatening thrombotic event was found to have a novel heterozygous missense mutation resulting in γCys326Ser, which was suggested as a predisposing factor of the thrombosis. Known mechanisms responsible for thrombosis in the current case were not demonstrated, suggesting other mechanisms including superimposing inherited and/or acquired risk factors. When a patient presents with unusual thrombosis such as breakthrough pulmonary embolism and huge thrombus in the right ventricle, as in the current case, the laboratory process for heritable thrombophilia should be considered.
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