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2017 ; 46
(4
): 596-608
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gab.com Text
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English Wikipedia
Polycomb Repressive Complex 2-Mediated Chromatin Repression Guides Effector
CD8(+) T Cell Terminal Differentiation and Loss of Multipotency
#MMPMID28410989
Gray SM
; Amezquita RA
; Guan T
; Kleinstein SH
; Kaech SM
Immunity
2017[Apr]; 46
(4
): 596-608
PMID28410989
show ga
Understanding immunological memory formation depends on elucidating how
multipotent memory precursor (MP) cells maintain developmental plasticity and
longevity to provide long-term immunity while other effector cells develop into
terminally differentiated effector (TE) cells with limited survival. Profiling
active (H3K27ac) and repressed (H3K27me3) chromatin in naive, MP, and TE CD8(+)
T cells during viral infection revealed increased H3K27me3 deposition at numerous
pro-memory and pro-survival genes in TE relative to MP cells, indicative of fate
restriction, but permissive chromatin at both pro-memory and pro-effector genes
in MP cells, indicative of multipotency. Polycomb repressive complex 2 deficiency
impaired clonal expansion and TE cell differentiation, but minimally impacted
CD8(+) memory T cell maturation. Abundant H3K27me3 deposition at pro-memory genes
occurred late during TE cell development, probably from diminished transcription
factor FOXO1 expression. These results outline a temporal model for loss of
memory cell potential through selective epigenetic silencing of pro-memory genes
in effector T cells.