Toll-Like Receptor Polymorphisms and Malaria Susceptibility
Summary
Toll-like receptors (TLRs) constitute a family of innate immune sensors that detect conserved molecular patterns on pathogens and initiate inflammatory and antimicrobial responses. Genetic polymorphisms in TLR genes can alter receptor structure, expression or signalling capacity, thereby influencing individual susceptibility to malaria and the severity of disease. Variants in TLR4, TLR2, TLR9 and other family members have been associated with differences in parasite clearance, cytokine profiles and the risk of severe complications such as cerebral malaria or high parasitaemia. Population studies across Africa, Asia and South America reveal that certain alleles confer protection by dampening excessive inflammation, whereas others increase risk by impairing effective parasite recognition. These findings underscore the role of host genetics in shaping malaria pathogenesis, the evolutionary pressure exerted by Plasmodium species and the potential for stratified therapeutic interventions. Understanding TLR polymorphisms not only illuminates mechanisms of innate immunity in malaria but also informs vaccine design, the development of adjuvants and the identification of at-risk groups for targeted prevention strategies.
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Toll-Like Receptor Polymorphisms and Malaria Susceptibility publication trend
The graph below shows the total number of articles in toll-like receptor polymorphisms and malaria susceptibility across all publications each year (not limited to Nature Index journals).
Technical terms
Toll-Like Receptor (TLR): A class of membrane-bound or endosomal proteins that recognise conserved molecular patterns on pathogens and trigger innate immune responses.
Polymorphism: A naturally occurring genetic variation at a specific locus within a population.
Single Nucleotide Polymorphism (SNP): A variation involving a single base pair in the DNA sequence among individuals.
Parasitaemia: The concentration or proportion of parasitic organisms, such as Plasmodium, present in the bloodstream.
Innate Immunity: The non-specific first line of defence against pathogens, involving pattern recognition receptors and rapid inflammatory responses.
References
- Genetic variants of TLR4, including the novel variant, rs5030719, and related genes are associated with susceptibility to clinical malaria in African children. Malaria Journal (2023).
- A meta-analysis of TLR4 and TLR9 SNPs implicated in severe malaria. Revista da Sociedade Brasileira de Medicina Tropical (2017).
- Association of TLR variants with susceptibility to Plasmodium vivax malaria and parasitemia in the Amazon region of Brazil. PLOS ONE (2017).
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