Congenital dysfibrinogenemias. A review

Area of Science:

• Hematology
• Genetics
• Biochemistry

Background:

• Inherited qualitative fibrinogen abnormalities, termed dysfibrinogenemias, are documented in 144 families.
• These conditions are typically inherited as autosomal dominant traits.
• While often asymptomatic, dysfibrinogenemias can manifest as bleeding, thrombosis, or impaired wound healing.

Purpose of the Study:

• To characterize the molecular basis and clinical implications of inherited dysfibrinogenemias.
• To understand the defects in the thrombin-fibrinogen reaction pathway caused by these abnormalities.

Main Methods:

• Functional assays to assess thrombin-fibrinogen reaction steps (fibrinopeptide cleavage, polymerization, fibrin cross-linking).
• Biochemical analysis of abnormal fibrinogen proteins.
• Physicochemical characterization of identified fibrinogen variants.

Main Results:

• Dysfibrinogenemias involve defects in fibrinogen's interaction with thrombin, affecting fibrinopeptide cleavage, polymerization, or cross-linking.
• Functional defects are attributed to single amino acid substitutions in the fibrinogen molecule.
• Distinct functional and biochemical profiles differentiate various dysfibrinogenemia cases.

Conclusions:

• Inherited dysfibrinogenemias represent a spectrum of genetic disorders affecting fibrinogen function.
• Molecular defects, primarily single amino acid substitutions, underlie these conditions.
• Clinical presentation and biochemical analysis are key to diagnosing and understanding dysfibrinogenemias.