Complex functional and structural coagulation abnormalities in the carbohydrate-deficient glycoprotein syndrome type...

Area of Science:

• Biochemistry
• Genetics
• Hematology

Background:

• Carbohydrate-deficient glycoprotein (CDG) syndrome type I is a rare autosomal recessive disorder.
• It presents with multisystemic issues, including life-threatening hemorrhages, venous thromboses, and stroke-like episodes in childhood.

Purpose of the Study:

• To investigate coagulation and fibrinolysis parameters in CDG syndrome type I patients.
• To correlate hemostatic factor levels and isoform patterns with clinical symptoms and liver enzyme levels.

Main Methods:

• Analysis of coagulation factors (II, V, X, XI), inhibitors (antithrombin, protein C), and fibrinolysis parameters in 15 CDG syndrome type I patients.
• Screening assays like APTT and PTC were performed.
• Isoform patterns of glycoproteins were examined.

Main Results:

• Reduced levels of factors II, V, X, XI, antithrombin, and protein C were observed in most patients.
• Over half the patients showed potentially risky levels of protein C and/or antithrombin.
• Partially carbohydrate-deficient isoforms were found in antithrombin, protein C, protein S, and alpha 2-antiplasmin, but not in factors II, X, or fibrinogen.
• Abnormal isoforms did not significantly impair functional activity.

Conclusions:

• CDG syndrome type I is associated with significant hemostatic factor deficiencies, posing clinical risks.
• Individual hemostatic parameter analysis is crucial for patient management, especially concerning clinical symptoms or surgery.
• The variability in glycoprotein defects may offer insights into the syndrome's pathogenesis.