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The order and logic of CD4 versus CD8 lineage choice and differentiation in mouse thymus

MM. Karimi, Y. Guo, X. Cui, HA. Pallikonda, V. Horková, YF. Wang, SR. Gil, G. Rodriguez-Esteban, I. Robles-Rebollo, L. Bruno, R. Georgieva, B. Patel, J. Elliott, MH. Dore, D. Dauphars, MS. Krangel, B. Lenhard, H. Heyn, AG. Fisher, O. Štěpánek, M....

. 2021 ; 12 (1) : 99. [pub] 20210104

Language English Country Great Britain

Document type Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't

Persistent link   https://www.medvik.cz/link/bmc21011631

Grant support
MC_U120027516 Medical Research Council - United Kingdom
MC_UP_1102/1 Medical Research Council - United Kingdom
099276/Z/12/Z Wellcome Trust - United Kingdom
R35 GM136284 NIGMS NIH HHS - United States

CD4 and CD8 mark helper and cytotoxic T cell lineages, respectively, and serve as coreceptors for MHC-restricted TCR recognition. How coreceptor expression is matched with TCR specificity is central to understanding CD4/CD8 lineage choice, but visualising coreceptor gene activity in individual selection intermediates has been technically challenging. It therefore remains unclear whether the sequence of coreceptor gene expression in selection intermediates follows a stereotypic pattern, or is responsive to signaling. Here we use single cell RNA sequencing (scRNA-seq) to classify mouse thymocyte selection intermediates by coreceptor gene expression. In the unperturbed thymus, Cd4+Cd8a- selection intermediates appear before Cd4-Cd8a+ selection intermediates, but the timing of these subsets is flexible according to the strength of TCR signals. Our data show that selection intermediates discriminate MHC class prior to the loss of coreceptor expression and suggest a model where signal strength informs the timing of coreceptor gene activity and ultimately CD4/CD8 lineage choice.

References provided by Crossref.org

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