Blood Group Gerbich

Blood Group Gerbich Full Name

glycophorin C (Gerbich blood group)

Blood Group Gerbich Introduction

The Gerbich blood group system consists of antigens carried on two related integral membrane glycoproteins: Glycophorin C (GPC) and Glycophorin D (GPD). Both proteins are encoded by the single GYPC gene located on chromosome 2q14.3 through the use of alternative start codons. Unlike the more abundant Glycophorin A and B, which primarily contribute to the negative surface charge of the red blood cell (RBC), Glycophorin C plays a critical structural role. Its cytoplasmic domain interacts with the membrane skeleton protein 4.1R and p55. This interaction is the "vertical" linkage that tethers the lipid bilayer to the underlying spectrin-actin cytoskeleton, thereby maintaining the mechanical stability and the characteristic biconcave shape of the erythrocyte.

Figure 1. Schematic representation of an erythrocyte membrane skeleton. (Source: Terada N, et al. 2023)

The clinical relevance of the Gerbich system is threefold: membrane pathology, transfusion immunology, and infectious disease. The most severe manifestation is the Leach phenotype (Ge-null), where individuals completely lack GPC and GPD. Because the membrane-cytoskeleton anchor is missing, these patients exhibit Hereditary Elliptocytosis (HE); their red blood cells lose their biconcave shape and become oval or elliptical, leading to mild compensated hemolytic anemia. Immunologically, antibodies against high-prevalence Gerbich antigens (like Anti-Ge2 or Anti-Ge3) can cause transfusion reactions and, although rare, Hemolytic Disease of the Fetus and Newborn (HDFN). Furthermore, Glycophorin C serves as a specific receptor for the erythrocyte binding antigen-140 (EBA-140) of the malaria parasite Plasmodium falciparum. Consequently, the Ge-negative phenotype (common in parts of Melanesia) is believed to have arisen as an evolutionary protective mechanism against malaria, as the parasite cannot easily invade these cells.

Alternate Names for Blood Group Gerbich

GYPC; glycophorin C (Gerbich blood group); GE; GPC; GPD; GYPD; CD236; PAS-2; CD236R; PAS-2; glycophorin-C; glycophorin-D; glycoconnectin; glycoprotein beta; sialoglycoprotein D;

• 1. Terada N, et al. Recent Progress on Genetically Modified Animal Models for Membrane Skeletal Proteins: The 4.1 and MPP Families. Genes (Basel). 2023 Oct 15;14(10):1942.
  2. Anstee DJ. The functional importance of blood group-active molecules in human red blood cells. Vox Sang. 2011 Jan;100(1):140-9.