Prion-like domains drive CIZ1 assembly formation at the inactive X chromosome.

Prion-like domains drive CIZ1 assembly formation at the inactive X chromosome.
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DOI:
10.1083/jcb.202103185
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发表时间:
2022-04-04
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Coverley D
Coverley D
中科院分区:
其他
文献类型:
--
作者:
Sofi S;Williamson L;Turvey GL;Scoynes C;Hirst C;Godwin J;Brockdorff N;Ainscough J;Coverley D

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本文剖析了在非活性X染色体上形成核内CIZ 1蛋白组装体对富含谷氨酰胺的朊病毒样结构域的需求。它突出了选择性剪接的影响,并暗示多聚谷氨酰胺结构域在维持表观遗传状态。CIZ 1以Xist lncRNA依赖性方式在雌性成纤维细胞中的失活X染色体(Xi)处形成大的组装体,并且是精确维持多梳靶基因组范围所需的。在这里,我们解决装配形成的要求,并表明CIZ 1经历了两个直接的相互作用与Xist,通过独立的N-和C-末端结构域。与Xist的相互作用,在Xi的组装,以及体外形成的自组装的复杂性由两个选择性剪接的富含谷氨酰胺的朊病毒样结构域(PLD 1和2)调节。PLD 2在野生型细胞中的现有CIZ 1-Xi组装中被抑制积累,但在其中H3 K27 me 3和H2 AK 119 ub的靶向、组装和富集从头发生的CIZ 1缺失细胞中是必需的。相比之下,PLD 1是从头组装和在预先存在的组件处积累所需的,并且在体外驱动稳定的纤维状网络的形成。它们共同赋予了对RNA的亲和力以及与Xist的重复E的复杂关系。这些数据表明,两个PLD的选择性剪接调节CIZ 1构建大型RNA-蛋白质组装体的能力。
This paper dissects the requirement for glutamine-rich prion-like domains in the formation of intranuclear CIZ1 protein assemblies at the inactive X chromosome. It highlights the influence of alternative splicing and implicates a polyglutamine domain in maintenance of the epigenetic state. CIZ1 forms large assemblies at the inactive X chromosome (Xi) in female fibroblasts in an Xist lncRNA-dependent manner and is required for accurate maintenance of polycomb targets genome-wide. Here we address requirements for assembly formation and show that CIZ1 undergoes two direct interactions with Xist, via independent N- and C-terminal domains. Interaction with Xist, assembly at Xi, and complexity of self-assemblies formed in vitro are modulated by two alternatively spliced glutamine-rich prion-like domains (PLD1 and 2). PLD2 is dispensable for accumulation at existing CIZ1–Xi assemblies in wild-type cells but is required in CIZ1-null cells where targeting, assembly, and enrichment for H3K27me3 and H2AK119ub occur de novo. In contrast, PLD1 is required for both de novo assembly and accumulation at preexisting assemblies and, in vitro, drives formation of a stable fibrillar network. Together they impart affinity for RNA and a complex relationship with repeat E of Xist. These data show that alternative splicing of two PLDs modulates CIZ1’s ability to build large RNA–protein assemblies.
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