Akirin specifies NF-κB selectivity of Drosophila innate immune response via chromatin remodeling.

Akirin specifies NF-κB selectivity of Drosophila innate immune response via chromatin remodeling.
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DOI:
10.15252/embj.201488456
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发表时间:
2014-10-16
期刊:
The EMBO journal
影响因子:
--
通讯作者:
Matt N
Matt N
中科院分区:
其他
文献类型:
--
作者:
Bonnay F;Nguyen XH;Cohen-Berros E;Troxler L;Batsche E;Camonis J;Takeuchi O;Reichhart JM;Matt N

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哺乳动物中激活促炎基因和抗炎基因的NF-κ B依赖性转录网络仍不清楚。由于NF-κB因子在进化上是保守的,我们使用果蝇来理解这个网络。NF-κB转录因子Relish在革兰氏阴性菌免疫攻击后激活效应基因表达。在这里,我们显示,使用全基因组的方法,保守的核蛋白Akirin是一个NF-κB辅因子所需的一个子集的Relish依赖性基因的激活与H3 K4 ac表观遗传标记的存在。大规模无偏蛋白质组学分析显示Akirin通过募集Osa-containing-SWI/SNF-like Brahma complex(BAP)来协调NF-κB的转录选择性。果蝇中的免疫攻击表明Akirin是一组效应基因转录所必需的,但对于先天免疫应答的负调节基因的转录是必需的。因此,Akirins作为分子选择剂,指定NF-κB靶基因子集之间的选择。这种机制在哺乳动物中是保守的,它的发现为建立针对促炎基因的更特异、毒性更低的抗炎药物铺平了道路。
The network of NF-κB-dependent transcription that activates both pro- and anti-inflammatory genes in mammals is still unclear. As NF-κB factors are evolutionarily conserved, we used Drosophila to understand this network. The NF-κB transcription factor Relish activates effector gene expression following Gram-negative bacterial immune challenge. Here, we show, using a genome-wide approach, that the conserved nuclear protein Akirin is a NF-κB co-factor required for the activation of a subset of Relish-dependent genes correlating with the presence of H3K4ac epigenetic marks. A large-scale unbiased proteomic analysis revealed that Akirin orchestrates NF-κB transcriptional selectivity through the recruitment of the Osa-containing-SWI/SNF-like Brahma complex (BAP). Immune challenge in Drosophila shows that Akirin is required for the transcription of a subset of effector genes, but dispensable for the transcription of genes that are negative regulators of the innate immune response. Therefore, Akirins act as molecular selectors specifying the choice between subsets of NF-κB target genes. The discovery of this mechanism, conserved in mammals, paves the way for the establishment of more specific and less toxic anti-inflammatory drugs targeting pro-inflammatory genes.
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