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The dynamics of CD4 + T cell memory development remain to be examined at genome scale. In malaria-endemic regions, antimalarial chemoprevention protects long after its cessation and associates with effects on CD4 + T cells. We applied single-cell RNA sequencing and computational modelling to track memory development during Plasmodium infection and treatment. In the absence of central memory precursors, two trajectories developed as T helper 1 (T H 1) and follicular helper T (T FH ) transcriptomes contracted and partially coalesced over three weeks. Progeny of single clones populated T H 1 and T FH trajectories, and fate-mapping suggested that there was minimal lineage plasticity. Relationships between T FH and central memory were revealed, with antimalarials modulating these responses and boosting T H 1 recall. Finally, single-cell epigenomics confirmed that heterogeneity among effectors was partially reset in memory. Thus, the effector-to-memory transition in CD4 + T cells is gradual during malaria and is modulated by antiparasitic drugs. Graphical user interfaces are presented for examining gene-expression dynamics and gene-gene correlations ( http://haquelab.mdhs.unimelb.edu.au/cd4_memory/ ).

Transcriptome dynamics of CD4+ T cells during malaria maps gradual transit from effector to memory