We report a serum-free, 3-D murine artificial thymic organoid (ATO) system that mimics normal murine thymopoiesis from four different mouse strains with the production of all T cell populations, from early thymic progenitors to functional single positive (CD8SP and CD4SP) TCRaband TCRyd cells. RNA sequencing aligned ATO-derived populations with phenotypically identical primary thymocytes. ATOs initiated with Rag1-/- marrow produced the same differentiation block as seen in the endogenous thymus, and Notch signaling patterns in ATOs mirrored primary thymopoiesis.  ATOs initiated with defined hematopoietic stem cells (HSCs) and progenitors from marrow and thymus recapitulated subsequent stages and the normal kinetics of T cell differentiation. Remarkably, a single HSC deposited into ATOs generated a complete trajectory of T cell differentiation producing a similar diverse TCR repertoire across clones.  ATOs represent a technically simple, highly reproducible and powerful experimental platform for the study of clonal thymopoiesis from HSCs. SOURCE: Gay,Miriam,Crooks (gcrooks@mednet.ucla.edu) -  University of California Los Angeles

Pluto Bioinformatics

GSE146224: Recapitulation of murine thymopoiesis in vitro from single hematopoietic stem cells