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Becattini, Simone; Latorre, Daniela; Mele, Federico; Foglierini, Mathilde; De Gregorio, Corinne; Cassotta, Antonino; Fernandez, Blanca; Kelderman, Sander; Schumacher, Ton N.; Corti, Davide; Lanzavecchia, Antonio; Sallusto, Federica
Science (American Association for the Advancement of Science), 01/2015, Volume: 347, Issue: 6220Journal Article
Distinct types of CD4+ T cells protect the host against different classes of pathogens. However, it is unclear whether a given pathogen induces a single type of polarized T cell. By combining antigenic stimulation and T cell receptor deep sequencing, we found that human pathogen- and vaccine-specific T helper 1 (TH1), TH2, and TH17 memory cells have different frequencies but comparable diversity and comprise not only clones polarized toward a single fate, but also clones whose progeny have acquired multiple fates. Single naïve T cells primed by a pathogen in vitro could also give rise to multiple fates. Our results unravel an unexpected degree of interclonal and intraclonal functional heterogeneity of the human T cell response and suggest that polarized responses result from preferential expansion rather than priming.
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