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Regulation of the Ifng locus in the context of T-lineage specification and plasticity Balasubramani A; Mukasa R; Hatton RD; Weaver CTImmunol Rev 2010[Nov]; 238 (1): 216-32Study of the development of distinct CD4(+) T-cell subsets from naive precursors continues to provide excellent opportunities for dissection of mechanisms that control lineage-specific gene expression or repression. Whereas it had been thought that the induction of transcription networks that control T-lineage commitment were highly stable, reinforced by epigenetic processes that confer heritability of functional phenotypes by the progeny of mature T cells, recent findings support a more dynamic view of T-lineage commitment. Here, we highlight advances in the mapping and functional characterization of cis elements in the Ifng locus that have provided new insights into the control of the chromatin structure and transcriptional activity of this signature T-helper 1 cell gene. We also examine epigenetic features of the Ifng locus that have evolved to enable its reprogramming for expression by other T-cell subsets, particularly T-helper 17 cells, and contrast features of the Ifng locus with those of the Il17a-Il17f locus, which appears less promiscuous.|Animals[MESH]|Cell Differentiation/genetics[MESH]|Cell Lineage[MESH]|Chromatin Assembly and Disassembly/immunology[MESH]|Epigenesis, Genetic/*immunology[MESH]|Gene Expression Regulation, Developmental[MESH]|Genetic Loci[MESH]|Humans[MESH]|Interferon-gamma/*genetics/immunology[MESH]|Interleukin-17/*genetics[MESH]|T-Lymphocyte Subsets/*immunology[MESH]|Th1 Cells/*immunology[MESH] |
