Function of a Foxp3 cis-element in protecting regulatory T cell identity.

Function of a Foxp3 cis-element in protecting regulatory T cell identity.
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FOXP3顺式元素在保护调节T细胞身份中的功能。

DOI:
10.1016/j.cell.2014.07.030
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发表时间:
2014-08-14
期刊:
影响因子:
64.5
通讯作者:
Zheng Y
Zheng Y
中科院分区:
生物学1区
文献类型:
--
作者:
Li X;Liang Y;LeBlanc M;Benner C;Zheng Y

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多细胞生物的稳态需要终末分化的细胞来保持其谱系特异性。然而,目前还不清楚是否存在机制,以积极保护细胞的身份,以应对环境的线索,赋予功能可塑性。由转录因子Foxp 3指定的调节性T(Treg)细胞对于免疫系统稳态是必不可少的。在这里,我们报告了保守的非编码序列2(CNS 2),一个富含CpG的Foxp 3内含子顺式元件,在成熟的T细胞中特异性去甲基化,有助于维持免疫稳态,并通过保护Treg身份来限制自身免疫性疾病的发展,以响应塑造成熟Treg功能并驱动其初始分化的信号。在活化的TCR中,CNS 2通过感应TCR/NFAT活化来帮助保护Foxp 3表达免受不稳定的细胞因子条件的影响,这促进了CNS 2和Foxp 3启动子之间的相互作用。因此,表观遗传标记的顺式元件可以保护细胞的身份,通过感知关键的环境线索,细胞身份的形成和功能可塑性,而不干扰初始细胞分化。
The homeostasis of multicellular organisms requires terminally differentiated cells to preserve their lineage specificity. However, it is unclear if mechanisms exist to actively protect cell identity in response to environmental cues that confer functional plasticity. Regulatory T (Treg) cells, specified by the transcription factor Foxp3, are indispensable for immune system homeostasis. Here, we report that conserved non-coding sequence 2 (CNS2), a CpG-rich Foxp3 intronic cis-element specifically demethylated in mature Tregs, helps maintain immune homeostasis and limit autoimmune disease development by protecting Treg identity in response to signals that shape mature Treg functions and drive their initial differentiation. In activated Tregs, CNS2 helps protect Foxp3 expression from destabilizing cytokine conditions by sensing TCR/NFAT activation, which facilitates the interaction between CNS2 and Foxp3 promoter. Thus, epigenetically marked cis-elements can protect cell identity by sensing key environmental cues central to both cell identity formation and functional plasticity without interfering with initial cell differentiation.
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