CCCTC-binding factor and the transcription factor T-bet orchestrate T helper 1 cell-specific structure and function at the interferon-gamma locus.

CCCTC-binding factor and the transcription factor T-bet orchestrate T helper 1 cell-specific structure and function at the interferon-gamma locus.
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CCCTC结合因子和转录因子T-BET在干扰素 - 伽马基因座处编排T辅助辅助辅助辅助因子1细胞特异性结构和功能。

DOI:
10.1016/j.immuni.2009.08.021
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发表时间:
2009-10-16
期刊:
影响因子:
32.4
通讯作者:
Wilson, Christopher B.
Wilson, Christopher B.
中科院分区:
医学1区
文献类型:
--
作者:
Sekimata, Masayuki;Perez-Melgosa, Mercedes;Miller, Sara A.;Weinmann, Amy S.;Sabo, Peter J.;Sandstrom, Richard;Dorschner, Michael O.;Stamatoyannopoulos, John A.;Wilson, Christopher B.

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细胞类型特异性的染色质构象差异是如何实现的,以及它们对基因表达的贡献还不完全清楚。在这里,我们确定了一个隐藏的干扰素-γ(Ifng)转录的上游协调者,它嵌入在人IL 26基因中,破坏了单个CTCF结合位点,并保留在所有哺乳动物中,甚至在啮齿动物中几乎完全缺失IL 26后仍然存活。CTCF和粘附素以细胞类型非特异性方式在体内占据该元件。该元件与位于第一内含子内和Ifng下游的另外两个位点近似,其中CTCF、粘附素和T-bet以Th 1特异性方式结合。这些相互作用、基因座内其他元件彼此之间以及与Ifng的近似以及稳健的Ifng表达依赖于CTCF和T-bet。结果表明,建筑(CTCF)和转录增强(T-bet)的因素和它们所结合的元素之间的合作是必要的适当的Th 1特异性表达Ifng。
How cell type-specific differences in chromatin conformation are achieved, and their contribution to gene expression are incompletely understood. Here we identify a cryptic upstream orchestrator of interferon-γ (Ifng) transcription, which is embedded within the human IL26 gene, compromised of a single CTCF-binding site and retained in all mammals, even surviving near-complete deletion of IL26 in rodents. CTCF and cohesins occupy this element in vivo in a cell-type non-specific manner. This element is approximated with two other sites located within the first intron and downstream of Ifng, where CTCF, cohesins and T-bet bind in a Th1-specific manner. These interactions, approximation of other elements within the locus to each other and to Ifng, and robust Ifng expression are dependent on CTCF and T-bet. The results demonstrate that cooperation between architectural (CTCF) and transcriptional enhancing (T-bet) factors and the elements to which they bind is required for proper Th1-specific expression of Ifng.
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