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Regulation of DNA methylation dictates Cd4 expression during the development of helper and cytotoxic T cell lineages
Journal article   Peer reviewed

Regulation of DNA methylation dictates Cd4 expression during the development of helper and cytotoxic T cell lineages

MacLean Sellars, Jun R Huh, Kenneth Day, Priya D Issuree, Carolina Galan, Stephane Gobeil, Devin Absher, Michael R Green and Dan R Littman
Nature immunology, Vol.16(7), pp.746-754
07/2015
DOI: 10.1038/ni.3198
PMCID: PMC4474743
PMID: 26030024

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Abstract

During development, progenitor cells with binary potential give rise to daughter cells that have distinct functions. Heritable epigenetic mechanisms then lock in gene-expression programs that define lineage identity. Regulation of the gene encoding the T cell-specific coreceptor CD4 in helper and cytotoxic T cells exemplifies this process, with enhancer- and silencer-regulated establishment of epigenetic memory for stable gene expression and repression, respectively. Using a genetic screen, we identified the DNA-methylation machinery as essential for maintaining silencing of Cd4 in the cytotoxic lineage. Furthermore, we found a requirement for the proximal enhancer in mediating the removal of DNA-methylation marks from Cd4, which allowed stable expression of Cd4 in helper T cells. Our findings suggest that stage-specific methylation and demethylation events in Cd4 regulate its heritable expression in response to the distinct signals that dictate lineage 'choice' during T cell development.
Animals CD4 Antigens - genetics CD4 Antigens - immunology CD4 Antigens - metabolism CD4-Positive T-Lymphocytes - immunology CD4-Positive T-Lymphocytes - metabolism CD8-Positive T-Lymphocytes - immunology CD8-Positive T-Lymphocytes - metabolism Cell Differentiation - genetics Cell Differentiation - immunology Cell Lineage - genetics Cell Lineage - immunology Cells, Cultured Chromatin - genetics Chromatin - immunology Chromatin - metabolism DNA (Cytosine-5-)-Methyltransferase 1 DNA (Cytosine-5-)-Methyltransferases - genetics DNA (Cytosine-5-)-Methyltransferases - immunology DNA (Cytosine-5-)-Methyltransferases - metabolism DNA Methylation - immunology Flow Cytometry Gene Expression - immunology HEK293 Cells Humans Mice, Knockout Mice, Transgenic RNA Interference - immunology T-Lymphocytes, Cytotoxic - immunology T-Lymphocytes, Cytotoxic - metabolism T-Lymphocytes, Helper-Inducer - immunology T-Lymphocytes, Helper-Inducer - metabolism Transcription Factors - genetics Transcription Factors - immunology Transcription Factors - metabolism

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