Epigenetic cell fate in Candida albicans is controlled by transcription factor condensates acting at super-enhancer-like elements.

Epigenetic cell fate in Candida albicans is controlled by transcription factor condensates acting at super-enhancer-like elements.
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DOI:
10.1038/s41564-020-0760-7
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发表时间:
2020-11
影响因子:
28.3
通讯作者:
Bennett RJ
Bennett RJ
中科院分区:
生物学1区
文献类型:
--
作者:
Frazer C;Staples MI;Kim Y;Hirakawa M;Dowell MA;Johnson NV;Hernday AD;Ryan VH;Fawzi NL;Finkelstein IJ;Bennett RJ

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真核细胞中的细胞身份是由转录调控网络(TRN)控制的,它定义了细胞类型特异的基因表达。在机会性真菌病原体白色念珠菌中,TRNS调节两种不同的细胞状态--白色和不透明--之间的表观遗传转换,这两种状态表现出不同的宿主相互作用。在这里,我们揭示了调节细胞特性的转录因子(TF)含有PrLD,它能够使液-液分离并形成相分离的冷凝物。正如在单个DNA分子上观察到的那样,多个白色不透明的TF可以共同组装成复杂的凝聚体。此外,PrLD之间的异型相互作用支持在活的真核细胞内的一个合成位点上组装多因子缩合物。Wor1 PrLD的突变表明,酸性残基的替代破坏了它在活细胞中分离和共招募其他TF的能力,以及它在决定白色念珠菌细胞命运中的作用。总之,这些研究表明,PrLD支持控制真菌细胞身份的TF复合体的组装,并突出了与调节哺乳动物细胞命运的“超级增强剂”的相似之处。
Cell identity in eukaryotes is controlled by transcriptional regulatory networks (TRNs) that define cell type-specific gene expression. In the opportunistic fungal pathogen Candida albicans, TRNs regulate epigenetic switching between two alternative cell states, ‘white’ and ‘opaque’, that exhibit distinct host interactions. Here, we reveal that the transcription factors (TFs) regulating cell identity contain prion-like domains (PrLDs) that enable liquid-liquid demixing and the formation of phase-separated condensates. Multiple white-opaque TFs can co-assemble into complex condensates as observed on single DNA molecules. Moreover, heterotypic interactions between PrLDs supports the assembly of multifactorial condensates at a synthetic locus within live eukaryotic cells. Mutation of the Wor1 PrLD revealed that substitution of acidic residues abolished its ability to phase separate and to co-recruit other TFs in live cells, as well as its function in C. albicans cell fate determination. Together, these studies reveal that PrLDs support the assembly of TF complexes that control fungal cell identity and highlight parallels with the ‘super-enhancers’ that regulate mammalian cell fate.
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