Mir-17-3p controls spinal neural progenitor patterning by regulating Olig2/Irx3 cross-repressive loop.

Mir-17-3p controls spinal neural progenitor patterning by regulating Olig2/Irx3 cross-repressive loop.
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DOI:
10.1016/j.neuron.2011.01.014
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发表时间:
2011-02-24
期刊:
影响因子:
16.2
通讯作者:
Wichterle H
Wichterle H
中科院分区:
医学1区
文献类型:
--
作者:
Chen JA;Huang YP;Mazzoni EO;Tan GC;Zavadil J;Wichterle H

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神经模式依赖于转录交叉抑制相互作用,确保神经祖细胞身份明确分配给增殖细胞。脊髓运动神经元 (pMN) 和 V2 中间神经元 (p2) 的祖细胞由一对交叉抑制转录因子 Olig2 和 Irx3 指定。谱系追踪显示,许多 p2 祖细胞在脊髓发育过程中短暂表达 pMN 标记 Olig2。在这里,我们证明 p2 结构域中 Olig2 的抑制是由 mir-17-3p microRNA 介导的 Olig2 mRNA 沉默控制的。缺乏所有 microRNA 或仅 mir-17~92 簇的小鼠表现出 pMN/p2 边界的背侧移动以及 V2 中间神经元产生的损害。我们的研究结果表明,microRNA 介导的 Olig2 mRNA 抑制通过改变 Olig2 和 Irx3 转录因子之间交叉抑制相互作用的平衡,在腹侧脊髓祖细胞结构域的形成过程中发挥着关键作用。
Neural patterning relies on transcriptional cross-repressive interactions that ensure unequivocal assignment of neural progenitor identity to proliferating cells. Progenitors of spinal motor neurons (pMN) and V2 interneurons (p2) are specified by a pair of cross-repressive transcription factors Olig2 and Irx3. Lineage tracing revealed that many p2 progenitors transiently express the pMN marker Olig2 during spinal cord development. Here we demonstrate that the repression of Olig2 in p2 domain is controlled by mir-17-3p microRNA-mediated silencing of Olig2 mRNA. Mice lacking all microRNAs or just the mir-17~92 cluster manifest a dorsal shift in pMN/p2 boundary and impairment in the production of V2 interneurons. Our findings suggest that microRNA-mediated repression of Olig2 mRNA plays a critical role during the patterning of ventral spinal progenitor domains by shifting the balance of cross-repressive interactions between Olig2 and Irx3 transcription factors.
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