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  • Title: A case of thrombomodulin mutation causing defective thrombin binding with absence of protein C and TAFI activation.
    Author: Okada M, Tominaga N, Honda G, Nishioka J, Akita N, Hayashi T, Suzuki K, Moriuchi H.
    Journal: Blood Adv; 2020 Jun 23; 4(12):2631-2639. PubMed ID: 32556284.
    Abstract:
    Thrombomodulin functions as an anticoagulant through thrombin binding and protein C activation. We herein report the first case of hereditary functional thrombomodulin deficiency presenting with recurrent subcutaneous hemorrhage and old cerebral infarction. The patient had a homozygous substitution of glycine by aspartate at amino acid residue 412 (Gly412Asp) in the thrombin-binding domain of the thrombomodulin gene (designated thrombomodulin-Nagasaki). In vitro assays using a recombinant thrombomodulin with the same mutation as the patient showed a total lack of thrombin binding and activation of protein C and thrombin-activatable fibrinolysis inhibitor (TAFI). Marked clinical and laboratory improvement was obtained with recombinant human soluble thrombomodulin therapy.
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