Mga safeguards embryonic stem cells from acquiring extraembryonic endoderm fates.

Mga safeguards embryonic stem cells from acquiring extraembryonic endoderm fates.
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Mga 保护胚胎干细胞免于获得胚胎外内胚层命运

DOI:
10.1126/sciadv.abe5689
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发表时间:
2021-01
期刊:
影响因子:
13.6
通讯作者:
Hao K
Hao K
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Qin J;Wang C;Zhu Y;Su T;Dong L;Huang Y;Hao K

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Mga作为一个看门人,阻止胚胎干细胞进入内胚层谱系。多梳组(PcG)蛋白形成多蛋白复合物,影响干细胞的身份和命运的决定仍然在很大程度上未探索的机制。在这里,通过在胚胎干细胞(ESC)中进行基于CRISPR的功能丧失筛选,我们鉴定了参与内胚层转录因子Gata 6抑制的PcG基因Mga。我们报告Mga的缺失导致小鼠围着床期胚胎死亡。我们进一步证明,Mga-空ESC表现出受损的自我更新和自发分化为原始内胚层(PE)。我们的数据支持一种模型,其中Mga可能作为PRC1.6组装的支架,并引导这种多聚体复合物到达特定的基因组靶点,包括编码内胚层因子Gata 4,Gata 6和Sox 17的基因。我们的研究结果揭示了Mga在ESC中的意想不到的功能,其中它作为看门人通过直接抑制一组内胚层分化主基因的表达来防止ESC进入PE谱系。
Mga functions as a gatekeeper to prevent embryonic stem cells from entering into the endodermal lineage. Polycomb group (PcG) proteins form multiprotein complexes that affect stem cell identity and fate decisions by still largely unexplored mechanisms. Here, by performing a CRISPR-based loss-of-function screen in embryonic stem cells (ESCs), we identify PcG gene Mga involved in the repression of endodermal transcription factor Gata6. We report that deletion of Mga results in peri-implantation embryonic lethality in mice. We further demonstrate that Mga-null ESCs exhibit impaired self-renewal and spontaneous differentiation to primitive endoderm (PE). Our data support a model in which Mga might serve as a scaffold for PRC1.6 assembly and guide this multimeric complex to specific genomic targets including genes that encode endodermal factors Gata4, Gata6, and Sox17. Our findings uncover an unexpected function of Mga in ESCs, where it functions as a gatekeeper to prevent ESCs from entering into the PE lineage by directly repressing expression of a set of endoderm differentiation master genes.
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