The DEAD-box RNA-binding protein DDX6 regulates parental RNA decay for cellular reprogramming to pluripotency.

The DEAD-box RNA-binding protein DDX6 regulates parental RNA decay for cellular reprogramming to pluripotency.
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DOI:
10.1371/journal.pone.0203708
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发表时间:
2018
期刊:
影响因子:
3.7
通讯作者:
Gojo S
Gojo S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kami D;Kitani T;Nakamura A;Wakui N;Mizutani R;Ohue M;Kametani F;Akimitsu N;Gojo S

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细胞转变和分化过程需要支持新表型的mRNA,但也需要清除亲本表型的现有mRNA。从成纤维细胞到诱导多能干细胞(iPSC)的细胞重编程发生在间充质上皮转化(MET)的早期阶段,并涉及剧烈的形态学变化。我们研究了MET的分子机制,重点是RNA代谢。DDX 6是一种RNA解旋酶,除了RO 60和RNY 1(一种非编码RNA)之外,DDX 6对iPSC的形成也是必不可少的,它们形成了参与细胞内核苷酸传感的复合物。RO 60/RNY 1/DDX 6复合物在加工体形成之前形成,这是RNA代谢的核心。DDX 6表达的消除抑制iPSC的产生,这是由靶向支持间充质表型的亲本mRNA沿着microRNA(如miR-302 b-3 p)的RNA衰变介导的。这些结果表明,亲本mRNA清除是细胞重编程的先决条件,DDX 6在这一过程中起着核心作用。
Cellular transitions and differentiation processes require mRNAs supporting the new phenotype but also the clearance of existing mRNAs for the parental phenotype. Cellular reprogramming from fibroblasts to induced pluripotent stem cells (iPSCs) occurs at the early stage of mesenchymal epithelial transition (MET) and involves drastic morphological changes. We examined the molecular mechanism for MET, focusing on RNA metabolism. DDX6, an RNA helicase, was indispensable for iPSC formation, in addition to RO60 and RNY1, a non-coding RNA, which form complexes involved in intracellular nucleotide sensing. RO60/RNY1/DDX6 complexes formed prior to processing body formation, which is central to RNA metabolism. The abrogation of DDX6 expression inhibited iPSC generation, which was mediated by RNA decay targeting parental mRNAs supporting mesenchymal phenotypes, along with microRNAs, such as miR-302b-3p. These results show that parental mRNA clearance is a prerequisite for cellular reprogramming and that DDX6 plays a central role in this process.
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