Journal
CELL HOST & MICROBE
Volume 26, Issue 5, Pages 579-+Publisher
CELL PRESS
DOI: 10.1016/j.chom.2019.10.012
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Funding
- National Health and Medical Research Council (NHMRC) of Australia [GNT1005653, 1043345]
- Victorian Endowment of Science Knowledge and Innovation (veski), Australia [GNT1005653, 1043345]
- Melbourne International Research Scholarship from the University of Melbourne, Australia
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Extreme diversity of the major Plasmodium falciparum antigen, PfEMP1, poses a barrier to identifying targets of immunity to malaria. Here, we used protein microarrays containing hundreds of variants of the DBL alpha domain of PfEMP1 to cover the diversity of Papua New Guinean (PNG) parasites. Probing the plasma of a longitudinal cohort of malaria-exposed PNG children showed that group 2 DBL alpha antibodies were moderately associated with a lower risk of uncomplicated malaria, whereas individual variants were only weakly associated with clinical immunity. In contrast, antibodies to 85 individual group 1 and 2 DBL alpha variants were associated with a 70%-100% reduction in severe malaria. Of these, 17 variants were strong predictors of severe malaria. Analysis of full-length PfEMP1 sequences from PNG samples shows that these 17 variants are linked to pathogenic CIDR domains. This suggests that whereas immunity to uncomplicated malaria requires a broad repertoire of antibodies, immunity to severe malaria targets a subset of conserved variants. These findings provide insights into antimalarial immunity and potential antibody biomarkers for disease risk.
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