Horizon 1 1 17 ACL : Articles dans des revues avec comité de lecture répertoriées par l'AERES Infection and Immunity 2466-2474 2015 fdi:010087122 ENG Infection and Immunity 0019-9567 ISI:000356243000024 6 10.1128/iai.03116-14 https://www.documentation.ird.fr/hor/fdi:010087122 https://www.documentation.ird.fr/intranet/publi/2023-02/010087122.pdf 83 Horizon (IRD) Plasmodium falciparum multidomain protein VAR2CSA stands today as the leading vaccine candidate against pregnancy-associated malaria (PAM). Most of the studies aiming to decrypt how naturally acquired immunity develops have assessed the immune recognition of individual VAR2CSA Duffy-binding-like (DBL) domains, thus overlooking the presence of conformational epitopes resulting from the overall folding of the full-length protein. In order to characterize the development of humoral immunity toward VAR2CSA, we made use of a large cohort of 293 Senegalese pregnant women to assess the level of recognition by plasma IgG of the full-length VAR2CSA protein of the 3D7 parasite strain (3D7-VAR2CSA), the CSA-binding multidomains 3D7-DBL1X to -DBL3X (3D7-DBL1X-3X), and the CSA nonbinding multidomains 3D7-DBL4 epsilon to -DBL6 epsilon (3D7-DBL4 epsilon-6 epsilon), as well as individual 3D7-DBL domains. Our results revealed a parity-dependent recognition of the full-length 3D7-VAR2CSA and of the CSA-binding region, 3D7-DBL1X-3X. Indeed, multigravid women possess significantly higher levels of antibodies directed against these constructs than primigravidae. Our results suggest an important role of antibodies targeting the CSA-binding region in the development of immunity against PAM, therefore providing new insights on how natural protection might be acquired and further information for the design of VAR2CSA-based vaccines. 050 ; 052 UR216