Transcriptomes and metabolism define mouse and human MAIT cell heterogeneity
Chandra, S.; Ascui, G.; Riffelmacher, T.; Chawla, A.; Ramirez-Suastegui, C.; Castelan, V. C.; Seumois, G.; Simon, H.; Murray, M. P.; Seo, G.-Y.; Premlal, A. L. R.; Verstichel, G.; Li, Y.; Lin, C.-H.; Greenbaum, J.; Lamberti, J.; Murthy, R.; Nigro, J.; Cheroutre, H.; Ottensmeier, C. H.; Hedrick, S. M.; Lu, L.-F.; Vijayanand, P.; Kronenberg, M.
Show abstract
Mucosal-associated invariant T (MAIT) cells are a subpopulation of T lymphocytes that respond to microbial metabolites. We performed single-cell RNA sequencing and metabolic analyses of MAIT cell subsets in thymus and peripheral tissues from mice and humans to define the heterogeneity and developmental pathway of these innate-like lymphocytes. We show that the predominant mouse subset, which produces IL-17 (MAIT17), and the subset that produces IFN{gamma} (MAIT1), have greatly different transcriptomes and metabolic states in the thymus and periphery. A splenic MAIT subset has a transcriptome similar to circulating lymphocytes, and in mice these also are found in recent thymic emigrants, suggesting partially mature cells emigrate from the thymus. Human MAIT cells are predominantly MAIT1 cells, but have a different metabolism from their mouse counterparts with increased fatty acid uptake and storage. Although mouse and human subsets are similar in thymus, in the periphery they diverge, likely reflecting environmental influences.
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