Foxn1 regulates key target genes essential for T cell development in postnatal thymic epithelial cells.

Foxn1 regulates key target genes essential for T cell development in postnatal thymic epithelial cells.
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DOI:
10.1038/ni.3537
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发表时间:
2016-10
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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胸腺上皮细胞的分化、生长和功能依赖于转录因子Foxn1的表达,然而其靶基因尚未被物理鉴定。利用新的静态和可诱导遗传模型系统和染色质研究,我们现在提供了出生后胸腺上皮直接Foxn1靶基因的全基因组图谱,并定义了Foxn1结合基序。我们详细介绍了Foxn1在这些细胞中的功能,并证明了Foxn1除了对与T细胞前体的吸引和谱系承诺有关的基因的转录控制外,还调节与抗原处理和胸腺细胞选择有关的基因的表达。因此,胸腺淋巴基质串扰和T细胞选择中的关键事件是由Foxn1编排的。
Thymic epithelial cell differentiation, growth and function depend on the expression of the transcription factor Foxn1, however its target genes have never been physically identified. Using novel static and inducible genetic model systems and chromatin studies, we provide now a genome wide map of direct Foxn1 target genes for postnatal thymic epithelia and define the Foxn1 binding motif. We detail the function of Foxn1 in these cells and demonstrate that in addition to the transcriptional control of genes involved in the attraction and lineage commitment of T cell precursors, Foxn1 regulates the expression of genes involved in antigen processing and thymocyte selection. Thus, critical events in thymic lympho-stromal cross-talk and T cell selection are indispensably choreographed by Foxn1.
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