A regulatory network involving Foxn4, Mash1 and delta-like 4/Notch1 generates V2a and V2b spinal interneurons from a common progenitor pool.

A regulatory network involving Foxn4, Mash1 and delta-like 4/Notch1 generates V2a and V2b spinal interneurons from a common progenitor pool.
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DOI:
10.1242/dev.005868
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发表时间:
2007-10
期刊:
Development (Cambridge, England)
影响因子:
--
通讯作者:
Richardson WD
Richardson WD
中科院分区:
其他
文献类型:
--
作者:
Del Barrio MG;Taveira-Marques R;Muroyama Y;Yuk DI;Li S;Wines-Samuelson M;Shen J;Smith HK;Xiang M;Rowitch D;Richardson WD

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在发育中的中枢神经系统中,细胞多样性部分取决于组织信号,这些信号建立区域限制的祖细胞结构域,每个祖细胞结构域产生不同类型的分化神经元。然而,每个祖细胞结构域内的神经元亚型特化的机制仍然知之甚少。腹侧脊髓中的p2祖细胞结构域产生两种中间神经元(IN)亚型V2 a和V2 b,它们整合到控制运动活动和运动的局部神经元网络中。Foxn 4是一种叉头转录因子,在V2 a和V2 b IN的共同祖细胞中表达,并直接为V2 b所需,但不为V2 a发育所需。我们在使用小鼠和鸡进行的实验中显示,Foxn 4诱导δ样4(Dll 4)和Mash 1(Ascl 1)的表达。然后Dll 4通过Notch 1发出信号以细分p2祖细胞库。Foxn 4、Mash 1和激活的Notch 1触发了导致V2 b IN的遗传级联反应,而没有激活的Notch 1的互补祖细胞组产生V2 a IN。因此,Foxn 4在V2 IN的发育中起双重作用:(1)通过启动Notch-Delta信号传导,它引入了V2 a和V2 b IN从其共同祖细胞发育所需的不对称性;(2)它同时激活V2 b基因程序。
In the developing central nervous system, cellular diversity depends in part on organising signals that establish regionally restricted progenitor domains, each of which produces distinct types of differentiated neurons. However, the mechanisms of neuronal subtype specification within each progenitor domain remain poorly understood. The p2 progenitor domain in the ventral spinal cord gives rise to two interneuron (IN) subtypes, V2a and V2b, which integrate into local neuronal networks that control motor activity and locomotion. Foxn4, a forkhead transcription factor, is expressed in the common progenitors of V2a and V2b INs and is required directly for V2b but not for V2a development. We show here in experiments conducted using mouse and chick that Foxn4 induces expression of delta-like 4 (Dll4) and Mash1 (Ascl1). Dll4 then signals through Notch1 to subdivide the p2 progenitor pool. Foxn4, Mash1 and activated Notch1 trigger the genetic cascade leading to V2b INs, whereas the complementary set of progenitors, without active Notch1, generates V2a INs. Thus, Foxn4 plays a dual role in V2 IN development: (1) by initiating Notch-Delta signalling, it introduces the asymmetry required for development of V2a and V2b INs from their common progenitors; (2) it simultaneously activates the V2b genetic programme.
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