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Ciofani M , Knowles GC , Wiest DL , von Boehmer H , Zuniga-Pflucker JC
Stage-specific and differential notch dependency at the alpha beta and gamma delta T lineage bifurcation
IMMUNITY. 2006 Jul;25(1) :105-116
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Abstract
Signals transduced by Notch receptors are indispensable for T cell specification and differentiation of up T lineage cells. However, the role of Notch signals during alpha beta versus gamma delta T lineage decision remains controversial. Here, we addressed this question by employing a clonal analysis of CD4(-)CD8(-) (DN) progenitor potential to position the divergence of alpha beta and gamma delta T cell lineages to the late DN2 to DN3 developmental stages. Accordingly, alpha beta and gamma delta precursor frequencies within these T cell progenitor subsets were determined, both in the presence and absence of Notch signaling through Delta-like 1. Notch signals were found to be critical for the DN to CD4(+)CD8(+) (DP) transition, irrespective of the identity (pT alpha beta or gamma delta) of the inducing T cell receptor complex, whereas gamma delta T cells developed from gamma delta TCR-expressing T cell progenitors in the absence of further Notch ligand interaction. Collectiv! ely, our findings demonstrate a differential, stage-specific requirement for Notch receptor-ligand interactions in the differentiation of up and gamma delta T cells from T cell progenitors.
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