Recent thymic emigrants and mature naive T cells exhibit differential DNA methylation at key cytokine loci.

Recent thymic emigrants and mature naive T cells exhibit differential DNA methylation at key cytokine loci.
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DOI:
10.4049/jimmunol.1300181
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发表时间:
2013-06-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Fink PJ
Fink PJ
中科院分区:
其他
文献类型:
--
作者:
Berkley AM;Hendricks DW;Simmons KB;Fink PJ

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Recent thymic emigrants (RTEs) are the youngest T cells in the lymphoid periphery, and exhibit phenotypic and functional characteristics distinct from those of their more mature counterparts in the naïve peripheral T cell pool. We show here that the Il2 and Il4 promoter regions of naïve CD4+ RTEs are characterized by site-specific hypermethylation compared to those of both mature naïve (MN) T cells and the thymocyte precursors of RTEs. Thus, RTEs do not merely occupy a midpoint between the thymus and the mature T cell pool, but represent a distinct transitional T cell population. Furthermore, RTEs and MN T cells exhibit distinct CpG DNA methylation patterns both before and after activation. Compared to MN T cells, RTEs express higher levels of several enzymes that modify DNA methylation, and inhibiting methylation during culture allows RTEs to reach MN T cell levels of cytokine production. Collectively, these data suggest that the functional differences that distinguish RTEs from MN T cells are influenced by epigenetic mechanisms and provide clues to a mechanistic basis for post-thymic maturation.
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