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Monocytes are integral to the immune response, yet their transcriptional and functional responses in primary <jats:italic>Plasmodium falciparum<\/jats:italic> infection and in clinical malaria are poorly understood.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The transcriptional and functional profiles of monocytes were examined in controlled human malaria infection with <jats:italic>P.\u00a0falciparum<\/jats:italic> blood stages and in children and adults with acute malaria. Monocyte gene expression and functional phenotypes were examined by RNA sequencing and flow cytometry at peak infection and compared to pre\u2010infection or at convalescence in acute malaria.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In subpatent primary infection, the monocyte transcriptional profile was dominated by an interferon (IFN) molecular signature. Pathways enriched included type I IFN signalling, innate immune response and cytokine\u2010mediated signalling. Monocytes increased TNF and IL\u201012 production upon <jats:italic>in vitro<\/jats:italic> toll\u2010like receptor stimulation and increased IL\u201010 production upon <jats:italic>in vitro<\/jats:italic> parasite restimulation. Longitudinal phenotypic analyses revealed sustained significant changes in the composition of monocytes following infection, with increased CD14<jats:sup>+<\/jats:sup>CD16<jats:sup>\u2212<\/jats:sup> and decreased CD14<jats:sup>\u2212<\/jats:sup>CD16<jats:sup>+<\/jats:sup> subsets. In acute malaria, monocyte CD64\/Fc\u03b3RI expression was significantly increased in children and adults, while HLA\u2010DR remained stable. Although children and adults showed a similar pattern of differentially expressed genes, the number and magnitude of gene expression change were greater in children.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Monocyte activation during subpatent malaria is driven by an IFN molecular signature with robust activation of genes enriched in pathogen detection, phagocytosis, antimicrobial activity and antigen presentation. The greater magnitude of transcriptional changes in children with acute malaria suggests monocyte phenotypes may change with age or exposure.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cti2.1144","type":"journal-article","created":{"date-parts":[[2020,6,19]],"date-time":"2020-06-19T00:21:02Z","timestamp":1592526062000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":24,"title":["Transcriptional profiling and immunophenotyping show sustained activation of blood monocytes in subpatent <i>Plasmodium falciparum<\/i> infection"],"prefix":"10.1002","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2253-1577","authenticated-orcid":false,"given":"Jessica R","family":"Loughland","sequence":"first","affiliation":[{"name":"QIMR Berghofer Medical Research Institute  Brisbane QLD Australia"},{"name":"Menzies School of Health Research  Darwin NT 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