ABO blood group antigen (ABO antigen)

The ABO blood group antigens are specific oligosaccharide structures found on the surface of erythrocytes (red blood cells) and other tissues[1][2][3][4][5]. They are determined by the inherited ABO gene locus, which encodes glycosyltransferases responsible for synthesizing either the A or B antigen, or neither (type O)[1][4][5]. Individuals naturally develop antibodies against A or B antigens not present on their cells, which plays a crucial role in determining compatibility during blood transfusion and transplantation[2][3][7][8]. While the presence or absence of these antigens acts as critical markers for immune recognition, they are not considered therapeutic targets themselves; rather, they function in transfusion medicine as important biomarkers for compatibility[1][2][7]. Targeting or interfering with these antigens directly is not a therapeutic strategy, but their mismatch can trigger life-threatening immune reactions[3][5][7]. Therefore, "A and B antigens on recipient erythrocytes" is not itself a therapeutic target in the classic sense and the commonly correct canonical name would refer to the class ("ABO blood group antigen") rather than a singular entity. The submitted entry is overly specific, lacks standard nomenclature, and combines two antigens in a manner not typically used in molecular biology or pharmacology. Key points regarding this entry: - Not a therapeutic target: The antigens themselves are not druggable proteins or receptors but are immunologically significant carbohydrates on RBC surfaces[1][5][7]. - Incorrect/misapplied entry: The query refers to antigens as a "target" in a sense relevant only for immunological recognition (e.g., transfusion medicine), not classical drug targeting. - Role in medicine: They determine blood compatibility and must be matched to prevent immune-mediated destruction of transfused cells[1][3][7]. - Alloantibodies: Patients may have anti-A and/or anti-B antibodies, leading to hemolytic transfusion reactions if given mismatched blood[1][3][5][7]. This information allows standardized, structured representation and highlights the unsuitability of "A and B antigens on recipient erythrocytes" as a therapeutic target per se.

Other names

A antigenB antigenABO antigenBlood group A antigenBlood group B antigen

Not applicable; anti-A and anti-B antibodies mediate immune recognition and destruction of incompatible erythrocytes