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Regulation of H3K4me3 at Transcriptional Enhancers Characterizes Acquisition of Virus-Specific CD8 + T Cell-Lineage-Specific Function.
Cell Reports 2017 December 20
Infection triggers large-scale changes in the phenotype and function of T cells that are critical for immune clearance, yet the gene regulatory mechanisms that control these changes are largely unknown. Using ChIP-seq for specific histone post-translational modifications (PTMs), we mapped the dynamics of ∼25,000 putative CD8+ T cell transcriptional enhancers (TEs) differentially utilized during virus-specific T cell differentiation. Interestingly, we identified a subset of dynamically regulated TEs that exhibited acquisition of a non-canonical (H3K4me3+ ) chromatin signature upon differentiation. This unique TE subset exhibited characteristics of poised enhancers in the naive CD8+ T cell subset and demonstrated enrichment for transcription factor binding motifs known to be important for virus-specific CD8+ T cell differentiation. These data provide insights into the establishment and maintenance of the gene transcription profiles that define each stage of virus-specific T cell differentiation.
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