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• W2136674543 abstract "The stability of a lineage program (cellular memory) is dependent on mechanisms that epigenetically maintain active or repressed states of gene expression (transcriptional memory). Although epigenetic silencing of genes has been clearly demonstrated from yeast to mammals, heritable maintenance of active transcription has been less clearly defined. To investigate the potential role of active transcriptional memory during lineage diversification, we employed targeted mutation of a positive-acting cis element in the Cd4 locus to determine the impact on CD4 expression and the differentiation of CD4(+) helper T cells in mice. We show that the proximal enhancer (E4(P)) of Cd4 is essential for CD4 expression in immature CD4(+)8(+) thymocytes. Furthermore, its loss resulted in reduced and unstable expression of CD4 in mature T cells. However, if the enhancer was deleted after cells had already committed to the helper T-cell lineage, CD4 expression remained high and was stable upon cell division. Active histone modifications, once initiated by E4(P), were also propagated independently of the enhancer. Thus, E4(P) is responsible for establishing an epigenetically inherited active Cd4 locus in the helper T-cell lineage. To our knowledge, this is the first genetic demonstration of active transcriptional memory in mammalian cells." @default.
• W2136674543 created "2016-06-24" @default.
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• W2136674543 date "2010-04-01" @default.
• W2136674543 modified "2023-09-25" @default.
• W2136674543 title "Epigenetic propagation of CD4 expression is established by the <i>Cd4</i> proximal enhancer in helper T cells" @default.
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• W2136674543 doi "https://doi.org/10.1101/gad.1901610" @default.
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