Blood Group Distribution and Genetic Variability
Summary
Blood group systems, notably ABO and Rhesus (Rh), display marked variation across global populations, reflecting both historical migrations and selective pressures such as infectious disease. The ABO system is determined by three major alleles encoding glycosyltransferases that generate A, B or O antigens on erythrocytes, whereas the Rh system centres on the D antigen, whose presence or absence defines Rh positivity or negativity. Allele frequencies for these systems vary regionally: type O predominates in many Indigenous American and African groups, whereas type A rises in parts of Europe and Asia. Rh-negative frequencies range from under 1% in parts of East Asia to over 15% in northern Europe. These patterns inform blood-transfusion strategies, maternal-foetal care to prevent haemolytic disease, and genetic epidemiology. Advances in high-throughput sequencing have unveiled novel rare ABO variants and complex haplotypes at the RHD locus, elucidating mechanisms of gene conversion, deletion and hybrid formation. Comparative population studies integrate allele frequency data with measures of gene diversity and structure, shedding light on demographic history and adaptation. Practical applications span optimised donor registry management, precise prenatal screening protocols and investigations of blood-group associations with disease susceptibility, including cardiovascular and infectious conditions. Ongoing work seeks to map the full spectrum of polymorphisms, understanding their functional impact and evolutionary origin.
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Blood Group Distribution and Genetic Variability publication trend
The graph below shows the total number of articles in blood group distribution and genetic variability across all publications each year (not limited to Nature Index journals).
Technical terms
ABO blood group system: A classification based on the presence of A and B antigens on red blood cells determined by ABO gene alleles.
Rhesus (Rh) factor: A blood-group antigen system centred on the D antigen; its presence defines Rh positivity.
Allele frequency: The relative proportion of a specific gene variant in a population.
Gene diversity: A measure of genetic variation reflecting the probability that two randomly chosen alleles are different.
References
- Frequencies and ethnic distribution of ABO and RhD blood groups in the Volta region of Ghana, towards effective blood bank services. African Health Sciences (2022).
- Distribution characteristics of ABO and RhD blood groups among the voluntary blood donors in Chongqing. Medicine (2020).
- Blood Groups Distribution and Gene Diversity of the ABO and Rh (D) Loci in the Mexican Population. BioMed Research International (2018).
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