Three cases of abnormal fibrinogens: Šumperk (Bβ His67Leu), Uniãov (Bβ Gly414Ser), and Brno (γArg275His)

Congenital dysfibrinogenemia is a rare disease characterised by inherited abnormality in the fibrinogen molecule, resulting in functional defects. Two patients, a 26-year-old woman and a 61-year-old man, both with history of thrombotic events, had abnormal coagulation test results. DNA sequencing showed the heterozygous gamma Y363N mutation (Fibrinogen Praha III) and the heterozygous Aalpha N106D mutation (Fibrinogen Plzen), respectively. Fibrin polymerisation, after addition of either thrombin or reptilase, showed remarkably delayed polymerisation in both cases. Fibrinolysis experiments showed slower tPA initiated lysis of clots. SDS-PAGE did not show any difference between normal and Praha III and Plzen fibrinogens. Both mutations had a significant effect on platelet aggregation. In the presence of either ADP or TRAP, both mutations caused the decrease of platelet aggregation. SEM revealed abnormal clot morphology, with a large number of free ends and narrower fibres of both fibrin Praha III and Plzen. Praha III mutation was situated in the polymerisation pocket "a". The replacement of the bulky aromatic side chain of tyrosine by the polar uncharged small side chain of asparagine may lead to a conformational change, possibly altering the conformation of the polymerisation pocket. The Plzen mutation is situated in the coiled-coil connector and this replacement of polar uncharged asparagine residue by polar acidic aspartate changes the alpha-helical conformation of the coiled-coil connector; and may destabilise hydrogen bonds in its neighborhood. Although both mutations are situated in different regions of the molecule, both mutations have a very similar effect on fibrinogen functions and both are connected with thromboses.

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Functional characterisation of plasma fibrin clots in Polish carriers of fibrinogen γArg275His mutation (fibrinogen Zabrze)

Undas¹,

Pastuszczak²,

Iwaniec³

et al. 2010

Thromb Haemost

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Dear Sirs, The molecular substitution γArg275His (γ275His fibrinogen), or γArg301His when amino acids are numbered from the initiator Met, is one of the most frequent mutations within the fibrinogen γ chain (about 20 carriers worldwide) (1). The γ275His mutation has been identified in asymptomatic patients (e.g. fibrinogens Barcelona IV [2], Essen I [3], Osaka III [4], Perugia I [3] and Brno [5]), or in patients with venous or arterial thrombotic events (e.g. Barcelona III [2], Bergamo II [3], and Haifa I [6]). Bleeding tendency has been reported only in fibrinogen Saga I (7) and fibrinogen Cordoba I (8). It has been suggested that γArg275His dysfibrinogenaemia predisposes to thrombosis (9). Replacement of γArg275 by histidine alters the interactions of D regions, impairs the formation of a hydrogen bond adequate for tight D:D interactions, and plays a key role in the initial alignment of fibrin monomers into protofibrils (10).

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Three cases of abnormal fibrinogens: Šumperk (Bβ His67Leu), Uniãov (Bβ Gly414Ser), and Brno (γArg275His)

Cited by 4 publications

References 17 publications

FGB mutations leading to congenital quantitative fibrinogen deficiencies: An update and report of four novel mutations

FGB mutations leading to congenital quantitative fibrinogen deficiencies: An update and report of four novel mutations

Two cases of congenital dysfibrinogenemia associated with thrombosis – Fibrinogen Praha III and Fibrinogen Plzeň

Functional characterisation of plasma fibrin clots in Polish carriers of fibrinogen γArg275His mutation (fibrinogen Zabrze)

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