A non-canonical BRD9-containing BAF chromatin remodeling complex regulates naive pluripotency in mouse embryonic stem cells.

A non-canonical BRD9-containing BAF chromatin remodeling complex regulates naive pluripotency in mouse embryonic stem cells.
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DOI:
10.1038/s41467-018-07528-9
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发表时间:
2018-12-03
影响因子:
16.6
通讯作者:
Hargreaves DC
Hargreaves DC
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Gatchalian J;Malik S;Ho J;Lee DS;Kelso TWR;Shokhirev MN;Dixon JR;Hargreaves DC

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单个亚基在哺乳动物BRG1相关因子(BAF)复合体在维持胚胎干细胞(ESC)多能性中的靶向和功能方面的作用尚未阐明。在这里,我们发现溴域包含蛋白9(BRD9)和胶质瘤抑制候选区域基因1(GLTSCR1)或其类似GLTSCR1L在小鼠ESCs中定义了一个更小的、非规范的BAF复合体(GBAF复合体),它不同于典型的ESC BAF复合体(EsBAF)。GBAF和esBAF复合体针对不同的基因组特征,GBAF与朴素多能性的关键调控因子共定位,这与其维持朴素多能性基因表达的独特功能是一致的。BRD9以溴域依赖的方式与BRD4相互作用,这导致GBAF复合体被招募到染色质,解释了这些表观遗传调控因子之间的功能相似性。总之,我们的结果强调了BAF复合体的异质性在维持多能性转录网络中的生物学重要性。BAF复合体是一种多亚单位的染色质重塑复合体,在转录调控中发挥重要作用。在这里,作者提供了BRD9和GLTSCR1/BICRA或其类似GLTSCR1样/BICRA的证据,定义了一个非规范的BAF复合体,调节小鼠胚胎干细胞的原始多能性。
The role of individual subunits in the targeting and function of the mammalian BRG1-associated factors (BAF) complex in embryonic stem cell (ESC) pluripotency maintenance has not yet been elucidated. Here we find that the Bromodomain containing protein 9 (BRD9) and Glioma tumor suppressor candidate region gene 1 (GLTSCR1) or its paralog GLTSCR1-like (GLTSCR1L) define a smaller, non-canonical BAF complex (GBAF complex) in mouse ESCs that is distinct from the canonical ESC BAF complex (esBAF). GBAF and esBAF complexes are targeted to different genomic features, with GBAF co-localizing with key regulators of naive pluripotency, which is consistent with its specific function in maintaining naive pluripotency gene expression. BRD9 interacts with BRD4 in a bromodomain-dependent fashion, which leads to the recruitment of GBAF complexes to chromatin, explaining the functional similarity between these epigenetic regulators. Together, our results highlight the biological importance of BAF complex heterogeneity in maintaining the transcriptional network of pluripotency. The BAF complex is a multi-subunit chromatin remodeling complex that plays important roles in transcription regulation. Here the authors provide evidence that BRD9 and GLTSCR1/BICRA or its paralog GLTSCR1-like/BICRAL define a non-canonical BAF complex that regulates naive pluripotency in mouse embryonic stem cells.
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