A conserved enhancer regulates Il9 expression in multiple lineages.

A conserved enhancer regulates Il9 expression in multiple lineages.
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DOI:
10.1038/s41467-018-07202-0
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发表时间:
2018-11-15
影响因子:
16.6
通讯作者:
Kaplan MH
Kaplan MH
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Koh B;Abdul Qayum A;Srivastava R;Fu Y;Ulrich BJ;Janga SC;Kaplan MH

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细胞因子基因受多种调控元件调控,这些调控元件赋予组织特异性和活化依赖性表达。编码IL-9的基因的顺式调节元件尚未确定,IL-9是一种促进过敏、自身免疫性炎症和肿瘤免疫的细胞因子。在这里,我们确定了一个增强子(CNS-25)的IL 9基因的上游结合大多数转录因子(TF),促进IL 9基因表达。小鼠生殖系中增强子的缺失改变了转录因子与剩余的IL-9调节元件的结合,并导致包括Th 9细胞在内的多种细胞类型中IL-9产生减少,并减弱IL-9依赖性免疫应答。此外,在原代人Th 9培养物中同源增强子(CNS-18)的缺失导致IL-9产生的显著降低。因此,IL 9 CNS-25/IL 9 CNS-18是IL-9产生的关键和保守的调节元件。白细胞介素-9(IL-9)在变态反应、自身免疫和肿瘤免疫中起重要作用,但其表达调控机制尚不清楚。在这里,作者显示了增强子(小鼠中的CNS-25和人中的CNS-18)对于IL-9表达的基本功能,该增强子的缺失严重阻碍了小鼠或人细胞中IL-9的产生。
Cytokine genes are regulated by multiple regulatory elements that confer tissue-specific and activation-dependent expression. The cis-regulatory elements of the gene encoding IL-9, a cytokine that promotes allergy, autoimmune inflammation and tumor immunity, have not been defined. Here we identify an enhancer (CNS-25) upstream of the Il9 gene that binds most transcription factors (TFs) that promote Il9 gene expression. Deletion of the enhancer in the mouse germline alters transcription factor binding to the remaining Il9 regulatory elements, and results in diminished IL-9 production in multiple cell types including Th9 cells, and attenuates IL-9-dependent immune responses. Moreover, deletion of the homologous enhancer (CNS-18) in primary human Th9 cultures results in significant decrease of IL-9 production. Thus, Il9 CNS-25/IL9 CNS-18 is a critical and conserved regulatory element for IL-9 production. Interleukin-9 (IL-9) is important for allergy, autoimmunity and tumor immunity, but how its expression is regulated is unclear. Here the authors show the essential function of an enhancer, CNS-25 in mouse and CNS-18 in human, for IL-9 expression, with the deletion of this enhancer severely hampering IL-9 production in mice or human cells.
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