Resumo

LAURICELLA, Ana María; SITTINGER, Katja; GEISEN, Christof  e  KORDICH, Lucía Clelia. “Dysfibrinogenemia Jujuy”, associated to bleeding Disorders. Acta bioquím. clín. latinoam. [online]. 2016, vol.50, n.2, pp.215-221. ISSN 0325-2957.

The aim of this work was to study a young female with moderate bleeding symptoms, to characterize the plasma fibrin and to identify the possible molecular alteration in the fibrinogen of the patient and her family. A dysfibrinogenemia was diagnosed in the patient, the mother and the half-brother, both the latter asymptomatic. Kinetic parameters obtained from fibrin formation and lysis assays of the patient’s plasma samples were significantly different compared to the ones obtained with control plasma. A prolonged lag phase  indicated slow and defective fibrinopeptide releases, whereas a minor slope suggested an impaired fibrin assembly. A lower ODMax revealed a fibrin network composed of thinner fibers. Fibrinolysis induced by streptokinase resulted faster than control. DNA sequencing showed a homozygous deletion leading to AaGly14del (according to http://www.geht.org/databaseang/fibrinogen). The mother and the half-brother resulted heterozygous for the same mutation. This previously undescribed alteration was named fibrinogen Jujuy. The mutate fibrinogen might not be correctly fixed to the active site of thrombin resulting in slow cleavage and release of fibrinopeptides, rendering thinner fibers, more susceptible to lysis than control. This mechanism may explain the moderate bleeding symptoms of the patient.

Palavras-chave : Dysfibrinogenemia; Coagulation tests; Fibrin formation; Fibrin lysability.

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