Immunogenetics of Plasmodium falciparum Malaria

Plasmodium falciparum malaria exerts one of the strongest selective pressures on the human genome, driving polymorphisms that modulate infection outcome and disease severity. Immunogenetics in this context encompasses the interaction between host genetic variants—such as blood-group antigens, complement receptor polymorphisms and human leucocyte antigen alleles—and the parasite’s antigenic repertoire. Key parasite ligands, notably the variant surface antigens PfEMP1, RIFIN and STEVOR, adhere to erythrocyte and endothelial receptors to mediate sequestration, rosetting and immune evasion. Host variants in genes encoding erythrocyte surface molecules (for example ABO blood groups and CR1), immunoglobulin Fc receptors and HLA class I and II molecules influence recognition, clearance and inflammatory responses. Genome-wide association studies and fine-mapping of single-nucleotide polymorphisms have uncovered loci that confer protection or susceptibility to severe malaria, illuminating pathways of complement activation, antigen presentation and cytokine regulation. Advances in bioinformatic mining of regulatory elements and functional assays in primary cells have begun to resolve how non-coding variants modulate expression of immune receptors. A comprehensive understanding of these host–parasite interactions has practical implications for vaccine design, therapeutic antibody development and targeted interventions in genetically at-risk populations across endemic regions.

Research from Nature Portfolio

Recent studies have characterised regulatory variants that underlie expression levels of complement receptor 1 (CR1) on erythrocytes. Bioinformatic analysis of transcription factor binding and enhancer landscapes identified two intronic elements whose disruption by naturally occurring single-nucleotide variants leads to reduced CR1 expression. Functional assays in donor erythrocytes demonstrated a dose-dependent correlation between genotype and CR1 mRNA as well as surface protein levels. Haplotype analysis across populations revealed that common markers insufficiently predict the low-expression phenotype in certain ancestries, resolving long-standing debates over genetic determinants of inherited CR1 variation. These findings establish a systematic framework for investigating how other blood-group regulators contribute to host protection against severe P. falciparum malaria.

Immunogenetics of Plasmodium falciparum Malaria publication trend

The graph below shows the total number of articles in immunogenetics of plasmodium falciparum malaria across all publications each year (not limited to Nature Index journals).

Technical terms

Antigenic variation: Process by which the parasite alters surface protein expression to evade host immunity.

Rosetting: Adhesion of infected erythrocytes to uninfected erythrocytes, forming clusters associated with microvascular obstruction.

PfEMP1: Polymorphic erythrocyte membrane protein 1 family mediating cytoadherence and immune evasion.

Complement receptor 1 (CR1): Erythrocyte surface receptor that binds complement fragments and influences rosetting.

Human leucocyte antigen (HLA): Group of genes encoding proteins that present antigenic peptides to T cells.

Genome-wide association study (GWAS): Unbiased approach to identify genetic variants associated with disease traits across the genome.

Single-nucleotide polymorphism (SNP): Variation at a single base in the DNA sequence among individuals.

References

1. Elucidation of the low-expressing erythroid CR1 phenotype by bioinformatic mining of the GATA1-driven blood-group regulome. Nature Communications (2023).
2. Non-O ABO blood group genotypes differ in their associations with Plasmodium falciparum rosetting and severe malaria. PLOS Genetics (2023).
3. Structural Basis for the ABO Blood-Group Dependence of Plasmodium falciparum Rosetting. PLOS Pathogens (2012).
4. Genetic polymorphisms linked to susceptibility to malaria. Malaria Journal (2011).