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SCIENCE IMMUNOLOGY | RESEARCH RESOURCE T CELL MEMORY Copyright © 2020 The Authors, some rights reserved; Early precursors and molecular determinants of tissue- exclusive licensee + American Association resident memory CD8 T lymphocytes revealed by for the Advancement of Science. No claim single-cell RNA sequencing to original U.S. Nadia S. Kurd1*†, Zhaoren He2,3*, Tiani L. Louis1, J. Justin Milner3, Kyla D. Omilusik3, Government Works Wenhao Jin2, Matthew S. Tsai1, Christella E. Widjaja1, Jad N. Kanbar1, Jocelyn G. Olvera1, Tiffani Tysl1, Lauren K. Quezada1, Brigid S. Boland1, Wendy J. Huang2, Cornelis Murre3, Ananda W. Goldrath3, Gene W. Yeo2,4‡, John T. Chang1,5‡§ + During an immune response to microbial infection, CD8 T cells give rise to distinct classes of cellular progeny that coordinately mediate clearance of the pathogen and provide long-lasting protection against reinfection, including Downloaded from a subset of noncirculating tissue-resident memory (TRM) cells that mediate potent protection within nonlymphoid + tissues. Here, we used single-cell RNA sequencing to examine the gene expression patterns of individual CD8 T cells in the spleen and small intestine intraepithelial lymphocyte (siIEL) compartment throughout the course of their differentiation in response to viral infection. These analyses revealed previously unknown transcriptional + heterogeneity within the siIEL CD8 T cell population at several stages of differentiation, representing functionally distinct TRM cell subsets and a subset of TRM cell precursors within the tissue early in infection. Together, these http://immunology.sciencemag.org/ + findings may inform strategies to optimize CD8 T cell responses to protect against microbial infection and cancer. INTRODUCTION composed of distinct subsets that play unique roles in mediating CD8+ T cells responding to microbial challenge differentiate into protective immunity.
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