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VAR2CSA Antibodies in Non-Pregnant Populations

Journal

TRENDS IN PARASITOLOGY
Volume 37, Issue 1, Pages 65-76

Publisher

CELL PRESS
DOI: 10.1016/j.pt.2020.09.012

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Funding

  1. Faculty Saint-Jean Research Office, University of Alberta
  2. Canadian Institutes of Health Research [168944]

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The detection of VAR2CSA IgGs in non-pregnant populations raises questions about their specificity and acquisition mechanisms, necessitating further investigation into their biological relevance and potential acquisition mechanisms in these populations.
The Plasmodium falciparum protein VAR2CSA is a critical mediator of placental malaria, and VAR2CSA antibodies (IgGs) are important to protect pregnant women. Although infrequently detected outside pregnancy, VAR2CSA IgGs were reported in men and children from Colombia and Brazil and in select African populations. These findings raise questions about the specificity of VAR2CSA IgGs and the mechanisms by which they are acquired outside pregnancy. Here we review the data on VAR2CSA IgGs in men and children from different malaria-endemic regions. We discuss experimental factors that may affect interpretation of the serological data and consider the biological relevance of VAR2CSA IgGs in non-pregnant populations. We propose potential mechanisms for the acquisition of VARCSA IgGs outside of pregnancy. We identify knowledge gaps and research priorities.

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