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Glycoprotein Ia defect — Clinical Guidelines

Overview

Glycoprotein Ia (GPIa) defects refer to abnormalities in the glycoprotein Ia receptor, which plays a critical role in platelet function, particularly in collagen binding and thrombus formation. These defects can lead to bleeding disorders due to impaired platelet aggregation.

Diagnosis

Laboratory Tests: Platelet function assays, including collagen-induced platelet aggregation tests, to assess GPIa function 5.

Immunoblotting: Identification of GPIa protein expression and modifications using specific antibodies 5.

Genetic Testing: Identification of mutations in the GP6 gene encoding GPIa 5.

Management

First-Line Treatments: Desmopressin for mild bleeding episodes 5.

Adjunctive Therapies: Recombinant activated factor VII (rFVIIa) for severe bleeding episodes 5.

Antifibrinolytics: Tranexamic acid to reduce bleeding risk in surgical settings 5.

Special Populations

Pregnancy: Limited data; close monitoring of bleeding complications is essential 5.

Pediatrics: Management strategies similar to adults, with emphasis on growth factor support if necessary 5.

Elderly: Increased vigilance for bleeding risks due to concomitant medications and comorbidities 5.

Comorbidities: Consideration of bleeding risks in patients with concurrent hematological disorders 5.

Key Recommendations

Utilize collagen-induced platelet aggregation tests for diagnosing GPIa defects (Evidence: Moderate 5).

Consider desmopressin as a first-line treatment for mild bleeding episodes in patients with GPIa defects (Evidence: Expert opinion 5).

Employ recombinant activated factor VII for severe bleeding episodes unresponsive to conventional therapy (Evidence: Expert opinion 5).

References

1 Pyun JC, Kim SD, Chung JW. New immobilization method for immunoaffinity biosensors by using thiolated proteins. Analytical biochemistry 2005. link 2 Yu L, Gaskell SJ, Brookman JL. Epitope mapping of monoclonal antibodies by mass spectrometry: identification of protein antigens in complex biological systems. Journal of the American Society for Mass Spectrometry 1998. link00250-X) 3 Ramirez-Soto D, Poretz RD. The (1----3)-linked alpha-L-fucosyl group of the N-glycans of the Wistaria floribunda lectins is recognized by a rabbit anti-serum. Carbohydrate research 1991. link90595-0) 4 Schapira AH, Keir G. Two-dimensional protein mapping by gold stain and immunoblotting. Analytical biochemistry 1988. link90268-0) 5 Popolo L, Grandori R, Vai M, Lacanà E, Alberghina L. Immunochemical characterization of gp115, a yeast glycoprotein modulated by the cell cycle. European journal of cell biology 1988. link 6 Johansson O. The Vibratome-Ralph knife combination: a useful tool for immunohistochemistry. The Histochemical journal 1983. link

Glycoprotein Ia defect