The Features of Antigen Prevalence of Rhesus System in Donor Population

Abstract

Research materials and methods. 852 voluntary Georgian blood donors have been typed on red blood cells group antigens. The research materials have taken from the diagnostic laboratory of Health Centre of Batumi (Georgia republic). The immunoserological methods with monoclonal anti –AB, -B, -A, A1, -A2 (H), -C, -c, - D, -E, -e (Bio-Rad, cypress diagnostics) antibodies was used for typing blood. The ID cards, such as ABO/D + Reverse Grouping (Bio-Rad) were also used for typing of erythrocyte antigens. Result. Prevalence of Rh system antigens in the studied group is looks like so: e antigens – 94,6%, c antigens -85%, C-68,03, E antigens - 38,07%. The majority (84%) of the studied donors are Rh-positive (n=719), 133 (16%) donors are Rh-negative. C antigen most common is present in the combination with D antigen. 65, 8 % case donors had CD+ combination (n=561). E antigen in most cases is presented with a combination of D antigen. 36, 9% of the studied donors (n=306) had ED+ combination. A miserable number of studied donors had CD - (2,23%; n=19) and ED - (1,17%; n=9) combinations. We have studied the Rh phenotypes prevalence in blood donors. According to RHD, RHC, and RHE gene loci, there are 18 theoretically possible phenotypical groups. Among them half (nine) are Rh-positive and the rest of them are Rh-negative. The Rh-positive phenotypes are: CDE; CDEe; CDe; CcDE; CcDEe; CcDe; ccDE; cDEe and cDe. Rh-negative phenotypes are CdE; CdEe; Cde; CcdE; CcdEe; Ccde; cdE; cdEe; cde. We allocated 17 Rh phenotypes among studied donors. Only one phenotype CdE, which belongs to Rh negative group, was not present in studied donors. Other 17 phenotypes showed different frequencies. Some of them were only in a single case, for example, cdEe, cdE, CdEe phenotypes had only one donor. The majority of the phenotype in he studied donors (27,8±1,53%) was CcDe (n=237). CcDEe -19,3±1,35% (n=165); 125 donors have CDe phenotype (14,6±1,2); The frequency of cde was 13,1±1,5%, which means that 112 studied donors belonged to this phenotype group; 87 studied donors had cDEe phenotype characteristics (10,2%); The frequency of cDe was 4,9% (n=42); 19 donors had CDEe phenotype. Other phenotypes (CDE, Cde, CcdEe, Ccde) frequency was very low. Conclusion. Our studied donors are characterized by rather high polymorphism. The Georgian donor’s population is heterogenic, especially high heterogeneity are shown in Rh positive phenotypes. The obtained data is vital importance for the preparation of whole blood or certain blood components for the purpose of their rational usage in blood transfusion.