Department of Molecular Biosciences, Northwestern University, 2200 Campus Drive, Evanston, IL 60208, USA.
Department of Molecular Biosciences, Northwestern University, 2200 Campus Drive, Evanston, IL 60208, USA.
Cytokine Growth Factor Rev. 2018 Dec;44:11-17. doi: 10.1016/j.cytogfr.2018.10.003. Epub 2018 Oct 22.
In response to virus infections, a cell-autonomous, transcription-based antiviral program is engaged to create resistance, impair pathogen replication, and alert professional cells in innate and adaptive immunity. This dual phase antiviral program consists of type I interferon (IFN) production followed by the response to IFN signaling. Pathogen recognition leads to activation of IRF and NFκB factors that function independently and together to recruit cellular coactivators that remodel chromatin, modify histones and activate RNA polymerase II (Pol II) at target gene loci, including the well-characterized IFNβ enhanceosome. In the subsequent response to IFN, a receptor-mediated JAK-STAT signaling cascade directs the assembly of the IRF9-STAT1-STAT2 transcription factor complex called ISGF3, which recruits its own cohort of remodelers, coactivators, and Pol II machinery to activate transcription of a wide range of IFN-stimulated genes. Regulation of the IFN and antiviral gene regulatory networks is not only important for driving innate immune responses to infections, but also may inform treatment of a growing list of chronic diseases that are characterized by hyperactive and constitutive IFN and IFN-stimulated gene (ISG) expression. Here, gene-specific and genome-wide investigations of the chromatin landscape at IFN and ISGs is discussed in parallel with IRF- and STAT- dependent regulation of Pol II transcription.
针对病毒感染,细胞自主的基于转录的抗病毒程序被激活以产生抗性,损害病原体复制,并激活先天和适应性免疫中的专业细胞。这个双相抗病毒程序由 I 型干扰素 (IFN) 的产生以及对 IFN 信号的反应组成。病原体识别导致 IRF 和 NFκB 因子的激活,这些因子独立和共同作用,募集细胞共激活因子,重塑染色质,修饰组蛋白,并在靶基因座上激活 RNA 聚合酶 II (Pol II),包括特征明确的 IFNβ 增强子。在随后对 IFN 的反应中,受体介导的 JAK-STAT 信号级联反应指导称为 ISGF3 的 IRF9-STAT1-STAT2 转录因子复合物的组装,该复合物募集其自身的重塑因子、共激活因子和 Pol II 机器,以激活广泛的 IFN 刺激基因的转录。IFN 和抗病毒基因调控网络的调节不仅对驱动对感染的先天免疫反应很重要,而且可能为越来越多的以过度活跃和组成性 IFN 和 IFN 刺激基因 (ISG) 表达为特征的慢性疾病的治疗提供信息。在这里,将讨论 IFN 和 ISG 处染色质景观的基因特异性和全基因组研究,以及 IRF 和 STAT 对 Pol II 转录的依赖性调节。