Neurogenin2 regulates the initial axon guidance of cortical pyramidal neurons projecting medially to the corpus callosum.

Neurogenin2 regulates the initial axon guidance of cortical pyramidal neurons projecting medially to the corpus callosum.
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Neurogenin2调节在callosum中间投射的皮质锥体神经元的初始轴突引导。

DOI:
10.1186/1749-8104-6-30
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发表时间:
2011-08-24
期刊:
影响因子:
3.6
通讯作者:
Polleux F
Polleux F
中科院分区:
生物学3区
文献类型:
--
作者:
Hand R;Polleux F

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哺乳动物中枢神经系统的形成需要在多种神经元亚型之间建立复杂的神经回路。在这里,我们报告原神经转录因子 Neurogenin2 (Ngn2) 对于皮质轴突投射的正确规范至关重要。小鼠 Ngn2 基因缺失导致向中线投射的胼胝体轴突减少以及中线交叉异常。 shRNA 介导的 Ngn2 敲低揭示了其细胞自主性要求,需要将轴突从 2/3 层锥体神经元正确投射到体内中线。我们发现体内 Ngn2 的急性缺失会诱导浅层 2/3 神经元的轴突横向投射到异常的皮质和皮质下目标。这些和之前的结果表明,Ngn2 对于定义皮质锥体神经元表型的基本特征的协调规范是必需的,包括它们的迁移特性、树突形态和轴突投影。
The formation of the mammalian central nervous system requires the establishment of complex neural circuits between a diverse array of neuronal subtypes. Here we report that the proneural transcription factor Neurogenin2 (Ngn2) is crucial for the proper specification of cortical axon projections. The genetic loss of Ngn2 in mice results in fewer callosal axons projecting towards the midline as well as abnormal midline crossing. shRNA-mediated knockdown of Ngn2 revealed its cell-autonomous requirement for the proper projection of axons from layer 2/3 pyramidal neurons to the midline in vivo. We found that the acute loss of Ngn2 in vivo induces the axon of superficial layer 2/3 neurons to project laterally towards aberrant cortical and subcortical targets. These and previous results demonstrate that Ngn2 is required for the coordinated specification of cardinal features defining the phenotype of cortical pyramidal neurons, including their migration properties, dendritic morphology and axonal projection.
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