title: T cell receptor-instructed alphabeta versus gammadelta lineage commitment revealed by single-cell analysis.
abstract: alphabeta and gammadelta T cell lineages develop in the thymus from a common precursor. It is unclear at which stage of development commitment to these lineages takes place and in which way T cell receptor signaling contributes to the process. Recently, it was demonstrated that strong TCR signals favor gammadelta lineage development, whereas weaker TCR signals promote alphabeta lineage fate. Two models have been proposed to explain these results. The first model suggests that commitment occurs after TCR expression and TCR signaling directly instructs lymphocytes to adopt one or the other lineage fate. The second model suggests that commitment occurs before TCR expression and that TCR signaling merely confirms the lineage choice. By tracing the fate of single T cell precursors, this study shows that there is no commitment to either the alphabeta or gammadelta lineage before TCR expression and that modulation of TCR signaling in progeny of a single TCR-expressing cell changes lineage commitment.
authors.affiliation: Laboratory of Lymphocyte Biology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: Taras
authors.initials: T
authors.lastname: Kreslavsky
authors.forename: Annette I
authors.initials: AI
authors.lastname: Garbe
authors.forename: Andreas
authors.initials: A
authors.lastname: Krueger
authors.forename: Harald
authors.initials: H
authors.lastname: von Boehmer
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D005434:Flow Cytometry; D015321:Gene Rearrangement; D006801:Humans; D007249:Inflammation / Q000235:genetics / Q000382:microbiology; D051379:Mice; D008807:Mice, Inbred BALB C; D008822:Mice, Transgenic; D016133:Polymerase Chain Reaction; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics*; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000235:genetics*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D016693:Receptors, Antigen, T-Cell, alpha-beta; D016692:Receptors, Antigen, T-Cell, gamma-delta