Genetic Diversity of Plasmodium falciparum Populations

Genetic diversity in Plasmodium falciparum underpins the parasite’s capacity to evade immune responses, adapt to drug pressure and sustain transmission across diverse epidemiological landscapes. Variation arises through point mutations, gene deletions, recombination and selection acting on surface antigens such as merozoite surface proteins (MSPs) and invasion ligands (for example PfEBA-175), as well as neutral microsatellite loci. Patterns of diversity reflect transmission intensity, geographic structure and intervention history, with high-transmission regions harbouring extensive polymorphism and multiple concurrent genotypes within hosts. Monitoring allelic frequencies and multiplicity of infection (MOI) informs vaccine development, drug efficacy trials and elimination strategies by revealing population structure, gene flow and potential emergence of resistant or vaccine-escape variants. Advances in genomic and single-cell approaches have further enhanced resolution of within-host and between-population diversity, enabling real-time surveillance in endemic settings worldwide.

Research from Nature Portfolio

Recent studies have characterised polymorphism in region II of PfEBA-175 across Southeast Asian isolates, demonstrating contrasting diversity profiles between Myanmar and Vietnam. Myanmar populations exhibit high levels of point mutations, deletions and recombination events, while Vietnam isolates show limited variation; nevertheless five amino acid substitutions recur globally, emphasising convergent selection and implications for a cross-regional vaccine design. Complementary single-cell RNA sequencing work in a West African endemic setting has mapped transcriptional states of individual parasite strains, revealing within-host heterogeneity and strain-specific gene expression patterns linked to transmission potential. These advances illustrate how high-resolution genomic tools can dissect the complexity of parasite populations at both the molecular and cellular scale, informing targeted interventions.

Genetic Diversity of Plasmodium falciparum Populations publication trend

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

Technical terms

Polymorphism: The presence of two or more genetic variants at a locus within a population.

Multiplicity of infection (MOI): The number of genetically distinct parasite clones co-infecting a single host.

Expected heterozygosity: A measure of genetic diversity reflecting the probability that two randomly chosen alleles at a locus are different.

Allelic family: A group of related gene variants sharing characteristic sequence motifs, for example in MSP genes.

Single-cell RNA sequencing: A method to profile transcriptomes of individual cells, revealing heterogeneity among parasite strains within a host.

References

1. Genetic polymorphism and natural selection of the erythrocyte binding antigen 175 region II in Plasmodium falciparum populations from Myanmar and Vietnam. Scientific Reports (2023).
2. Tackling malaria transmission at a single cell level in an endemic setting in sub-Saharan Africa. Nature Communications (2022).
3. Plasmodium falciparum genetic diversity and multiplicity of infection based on msp-1, msp-2, glurp and microsatellite genetic markers in sub-Saharan Africa: a systematic review and meta-analysis. Malaria Journal (2024).
4. Extensive diversity in the allelic frequency of Plasmodium falciparum merozoite surface proteins and glutamate-rich protein in rural and urban settings of southwestern Nigeria. Malaria Journal (2018).