Rbfox Splicing Factors Promote Neuronal Maturation and Axon Initial Segment Assembly.

Rbfox Splicing Factors Promote Neuronal Maturation and Axon Initial Segment Assembly.
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DOI:
10.1016/j.neuron.2018.01.020
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发表时间:
2018-02-21
期刊:
影响因子:
16.2
通讯作者:
Zhang C
Zhang C
中科院分区:
医学1区
文献类型:
--
作者:
Jacko M;Weyn-Vanhentenryck SM;Smerdon JW;Yan R;Feng H;Williams DJ;Pai J;Xu K;Wichterle H;Zhang C

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神经元的成熟需要巨大的形态和功能变化,但这一过程的分子机制还不清楚。在这里,我们研究了Rbfox 1 -3蛋白的作用,这是一个在多种神经发育障碍中突变的组织特异性剪接调节因子家族。我们生成了Rbfox三重敲除(tKO)腹侧脊髓神经元,以定义Rbfox调控下的替代外显子的全面网络,并研究其在发育中的神经元中的功能重要性。Rbfox tKO神经元在许多细胞骨架、膜和突触蛋白的选择性剪接中表现出缺陷,并显示出不成熟的电生理活性。轴突起始段(AIS)是对动作电位起始重要的亚细胞结构,在Rbfox耗尽后减少。我们在锚蛋白G(AIS“相互作用中心”蛋白)中鉴定了Rbfox调节的剪接开关,其调节锚蛋白G-β血影蛋白亲和力和AIS组装。我们的数据表明,Rbfox调控的剪接程序在有丝分裂后神经元的结构和功能成熟中起着至关重要的作用。Jacko等人鉴定了一个全面的神经元Rbfox剪接程序,富集了细胞骨架、膜和突触基因。Rbfox 1/2/3三重敲除运动神经元表现出兴奋性和轴突起始段组装的缺陷,由Ankyrin G中的发育剪接开关调节。
Neuronal maturation requires dramatic morphological and functional changes, but the molecular mechanisms governing this process are not well understood. Here, we studied the role of Rbfox1-3 proteins, a family of tissue-specific splicing regulators mutated in multiple neurodevelopmental disorders. We generated Rbfox triple knockout (tKO) ventral spinal neurons to define a comprehensive network of alternative exons under Rbfox regulation and to investigate their functional importance in the developing neurons. Rbfox tKO neurons exhibit defects in alternative splicing of many cytoskeletal, membrane, and synaptic proteins, and display immature electrophysiological activity. The axon initial segment (AIS), a subcellular structure important for action potential initiation, is diminished upon Rbfox depletion. We identified an Rbfox-regulated splicing switch in ankyrin G, the AIS “interaction hub” protein, that regulates ankyrin G-beta spectrin affinity and AIS assembly. Our data show that the Rbfox-regulated splicing program plays a crucial role in structural and functional maturation of postmitotic neurons. Jacko et al. identified a comprehensive neuronal Rbfox splicing program, enriched for cytoskeletal, membrane, and synaptic genes. Rbfox1/2/3 triple knockout motor neurons exhibit defects in excitability and axon initial segment assembly, regulated by a developmental splicing switch in Ankyrin G.
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