GP1BA

GP1BA Full Name

glycoprotein Ib (platelet), alpha polypeptide

GP1BA Introduction

GP1BA (glycoprotein Ib alpha, GPIbα) encodes the primary ligand-binding subunit of the platelet GPIb-IX-V receptor complex, a key mediator of platelet adhesion under high shear stress. This receptor enables platelets to rapidly tether to sites of vascular injury, initiating the clotting process. Certain genetic variants in GP1BA can subtly disrupt the assembly of the GPIb-IX-V complex, leading to impaired platelet function. Interestingly, many of these variants result in only mild or atypical bleeding, making diagnosis challenging and emphasizing the gene's critical yet nuanced role in maintaining normal platelet activity.

Functionally, GPIbα interacts with von Willebrand factor exposed on damaged blood vessels, triggering platelet rolling, activation, and aggregation. Mutations in specific regions, such as the leucine-rich repeats, can cause macrothrombocytopenia, where platelet counts are reduced and platelets appear abnormally large, while megakaryocyte development remains largely normal. This complex interplay of genetic alteration and platelet behavior highlights why standard clinical evaluations often fail to distinguish subtle platelet disorders, and why targeted genetic testing has become essential for accurate diagnosis.

Beyond inherited platelet diseases, GP1BA represents a promising target for therapeutic intervention. Selective inhibition of GP1BA can block pathological platelet adhesion, offering potential strategies to prevent thrombosis, such as heart attacks or strokes, while minimizing bleeding risks compared with traditional antiplatelet therapies. Additionally, certain GP1BA variants are increasingly recognized for their relevance in precision medicine, guiding both risk assessment and personalized treatment approaches. As both a disease-related gene and a druggable target, GP1BA continues to draw attention from researchers and clinicians seeking better diagnostic tools and safer, more effective antithrombotic therapies.

Alternate Names for GP1BA

GP1BA; glycoprotein Ib (platelet), alpha polypeptide; BSS; GP1B; VWDP; CD42B; GPIbA; BDPLT1; BDPLT3; DBPLT3; CD42b-alpha; platelet glycoprotein Ib alpha chain; GP-Ib alpha; antigen CD42b-alpha; platelet membrane glycoprotein 1b-alpha subunit;

• 1.Dib F, et al.; Biological, clinical features and modelling of heterozygous variants of glycoprotein Ib platelet subunit alpha (GP1BA) and glycoprotein Ib platelet subunit beta (GP1BB) genes responsible for constitutional thrombocytopenia. Br J Haematol. 2022, 199(5):744-753.
  2.Ghalloussi D, et al.; A new heterozygous mutation in GP1BA gene responsible for macrothrombocytopenia. Br J Haematol. 2018,183(3):503-506.