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An alternative outcome is exhaustion, a state of T cell dysfunction that occurs in the context of chronic infections and cancer. Although it is evident that exhausted CD8<jats:sup>+<\/jats:sup> T (T<jats:sub>EX<\/jats:sub>) cells are phenotypically and molecularly distinct from effector and memory CD8<jats:sup>+<\/jats:sup> T cells, the factors regulating the earliest events in the differentiation process of T<jats:sub>EX<\/jats:sub> cells remain incompletely understood. Here, we performed single-cell RNA-sequencing and single-cell ATAC-sequencing of CD8<jats:sup>+<\/jats:sup> T cells responding to LCMV-Armstrong (LCMV-Arm) or LCMV-Clone 13 (LCMV-Cl13), which result in acute or chronic infections, respectively. Compared to CD8<jats:sup>+<\/jats:sup> T cells that had undergone their first division in response to LCMV-Arm (Div1<jats:sub>ARM<\/jats:sub>) cells, CD8<jats:sup>+<\/jats:sup> T cells that had undergone their first division in response to LCMV-Cl13 (Div1<jats:sub>CL13<\/jats:sub>) expressed higher levels of genes encoding transcription factors previously associated with exhaustion, along with higher levels of Ezh2, the catalytic component of the Polycomb Repressive Complex 2 (PRC2) complex, which mediates epigenetic silencing. Modulation of Ezh2 resulted in altered expression of exhaustion-associated molecules by CD8<jats:sup>+<\/jats:sup> T cells responding to LCMV-Cl13, though the specific cellular and infectious contexts, rather than simply the level of Ezh2 expression, likely determine the eventual outcome. Taken together, these findings suggest that the differentiation paths of CD8<jats:sup>+<\/jats:sup> T cells responding to acute versus chronic infections may diverge earlier than previously appreciated.<\/jats:p>","DOI":"10.1371\/journal.pbio.3001983","type":"journal-article","created":{"date-parts":[[2023,1,30]],"date-time":"2023-01-30T19:47:25Z","timestamp":1675108045000},"page":"e3001983","update-policy":"https:\/\/doi.org\/10.1371\/journal.pbio.corrections_policy","source":"Crossref","is-referenced-by-count":27,"title":["Early transcriptional and epigenetic divergence of CD8+ T cells responding to acute versus chronic infection"],"prefix":"10.1371","volume":"21","author":[{"given":"Lauren K.","family":"Quezada","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenhao","family":"Jin","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yi 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