Nolz1 is induced by retinoid signals and controls motoneuron subtype identity through distinct repressor activities.

Nolz1 is induced by retinoid signals and controls motoneuron subtype identity through distinct repressor activities.
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DOI:
10.1242/dev.028043
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发表时间:
2009-01
期刊:
Development (Cambridge, England)
影响因子:
--
通讯作者:
Sockanathan S
Sockanathan S
中科院分区:
其他
文献类型:
--
作者:
Ji SJ;Periz G;Sockanathan S

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最终神经元身份的获得和维持部分取决于有丝分裂后神经元中命运指定程序的实施;然而,所涉及的机制仍不清楚。在发育中的脊髓中,视黄酸 (RA) 信号通路指定有丝分裂后运动神经元 (MN) 的柱状和分裂特性。在这里,我们发现 RA 信号诱导分化的雏鸡 MN 中 NET 转录调节因子 Nolz1 的表达,它调节未来 Lim3 阴性运动柱的渐进规范。 Nolz1 通过下调 Lim3 表达并维持 MN 身份和生存所需的关键同源域蛋白的表达来控制前肢和胸部 Lim3 阴性运动柱的初始形成。在前肢水平,Nolz1 通过诱导有丝分裂后 LMC 决定子 Hoxc6 的表达来指定横向运动柱 (LMC) 身份,并通过 Lim1 诱导实现横向 LMC 身份的部分规范。 Nolz1 功能的特异性取决于不同的阻遏蛋白活性,这些活性部分需要 Grg5 的调节活性,Grg5 是 Gro-TLE 共阻遏蛋白家族的非典型成员。因此,RA 信号通过诱导关键转录调节因子的表达来调节 MN 亚型规范中的多种事件,该转录调节因子通过功能不同的阻遏复合物控制多种发育途径。
The acquisition and maintenance of final neuronal identity depends in part upon the implementation of fate-specification programs in postmitotic neurons; however, the mechanisms involved remain unclear. In the developing spinal cord, retinoic acid (RA) signaling pathways specify the columnar and divisional identities of postmitotic motoneurons (MNs). Here we show that RA signals induce expression of the NET transcriptional regulator Nolz1 in differentiated chick MNs, where it regulates the progressive specification of prospective Lim3-negative motor columns. Nolz1 controls the initial formation of forelimb and thoracic Lim3- negative motor columns by downregulating Lim3 expression and maintaining the expression of key homeodomain proteins necessary for MN identity and survival. At forelimb levels, Nolz1 specifies lateral motor column (LMC) identity by inducing the expression of the postmitotic LMC determinant Hoxc6, and implements the partial specification of lateral LMC identity through Lim1 induction. The specificity of Nolz1 function depends upon distinct repressor activities that require, in part, the modulatory activity of Grg5, an atypical member of the Gro-TLE family of co-repressors. Thus, RA signals regulate diverse events in MN subtype specification by inducing the expression of a key transcriptional regulator that controls multiple developmental pathways via functionally distinct repressor complexes.
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