Mapping immune variation and var gene switching in naïve hosts infected with Plasmodium falciparum

Kathryn Milne, Alasdair Ivens, Adam J. Reid, Magda E. Lotkowska, Áine O'Toole, Geetha Sankaranarayanan , Diana Munoz Sandoval, Wiebke Nahrendorf, Clement Regnault , Nick J. Edwards, Sarah E. Silk, Ruth O. Payne, Angela M. Minassian, Navin Venkatraman, Mandy Sanders, Adrian V S Hill, Michael P. Barrett, Matthew Berriman, Simon J. Draper, Alexandra J RowePhilip J Spence

Research output: Contribution to journalArticlepeer-review

Abstract

Falciparum malaria is clinically heterogeneous and the relative contribution of parasite and host in shaping disease severity remains unclear. We explored the interaction between inflammation and parasite variant surface antigen (VSA) expression, asking whether this relationship underpins the variation observed in controlled human malaria infection (CHMI). We uncovered marked heterogeneity in the host response to blood challenge; some volunteers remained quiescent, others triggered interferon-stimulated inflammation and some showed transcriptional evidence of myeloid cell suppression. Significantly, only inflammatory volunteers experienced hallmark symptoms of malaria. When we tracked temporal changes in parasite VSA expression to ask whether variants associated with severe disease rapidly expand in naïve hosts we found no transcriptional evidence to support this hypothesis. These data indicate that parasite variants that dominate severe malaria do not have an intrinsic growth or survival advantage; instead, they presumably rely upon infection induced changes in their within-host environment for selection.
Original languageEnglish
Article numbere62800
Number of pages31
JournaleLIFE
Volume10
Early online date2 Mar 2021
DOIs
Publication statusE-pub ahead of print - 2 Mar 2021

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