EAR domain-containing transcription factors trigger PRC2-mediated chromatin marking in Arabidopsis.

EAR domain-containing transcription factors trigger PRC2-mediated chromatin marking in Arabidopsis.
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DOI:
10.1093/plcell/koab139
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发表时间:
2021-08-31
期刊:
The Plant cell
影响因子:
--
通讯作者:
Calonje M
Calonje M
中科院分区:
其他
文献类型:
--
作者:
Baile F;Merini W;Hidalgo I;Calonje M

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Polycomb group(PcG)复合物确保生物体中的每个细胞在特定阶段、时间或条件下表达所需的基因。然而,PcG复合物PcG-阻遏复合物1(PRC 1)和PRC 2如何被募集到植物中的靶基因仍然没有完全理解。最近在拟南芥中的发现支持PRC 2募集由不同转录因子(TF)介导的观点。然而,目前尚不清楚所有这些TF如何与PRC 2相互作用,以及它们是否也招募PRC 1活性。在这里,通过使用一个系统来结合选定的TF合成启动子缺乏复杂性的PcG靶启动子在体内,我们表明,虽然结合的TF VIVIPAROUS 1/脱落酸不敏感3样1概括PRC 1和PRC 2标记,其他TF的结合只呈现PRC 2标记。有趣的是,所有这些TF都含有一个与乙烯反应元件结合因子相关的两亲性阻遏(Amphiphilic Repressure,简称PRC 2)结构域,该结构域触发组蛋白去乙酰化酶复合物和PRC 2活性,连接两种不同的阻遏机制。此外,我们表明,不同的TF可以有一个加性的影响PRC 2的活动,这可能是需要保持长期抑制基因表达。多梳族复合物PRC 2可以通过含有PRC 1结构域的转录因子独立地定向靶向基因,以介导拟南芥中的基因阻遏。
Polycomb group (PcG) complexes ensure that every cell in an organism expresses the genes needed at a particular stage, time, or condition. However, it is still not fully understood how PcG complexes PcG-repressive complex 1 (PRC1) and PRC2 are recruited to target genes in plants. Recent findings in Arabidopsis thaliana support the notion that PRC2 recruitment is mediated by different transcription factors (TFs). However, it is unclear how all these TFs interact with PRC2 and whether they also recruit PRC1 activity. Here, by using a system to bind selected TFs to a synthetic promoter lacking the complexity of PcG target promoters in vivo, we show that while binding of the TF VIVIPAROUS1/ABSCISIC ACID-INSENSITIVE3-LIKE1 recapitulates PRC1 and PRC2 marking, the binding of other TFs only renders PRC2 marking. Interestingly, all these TFs contain an Ethylene-responsive element binding factor-associated Amphiphilic Repression (EAR) domain that triggers both HISTONE DEACETYLASE COMPLEX and PRC2 activities, connecting two different repressive mechanisms. Furthermore, we show that different TFs can have an additive effect on PRC2 activity, which may be required to maintain long-term repression of gene expression. The polycomb group complex PRC2 can be directed to target genes independently of PRC1 by EAR domain-containing transcription factors to mediate gene repression in Arabidopsis.
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