Alternative Splicing Coupled Nonsense-Mediated Decay Generates Neuronal Cell Type-Specific Expression of SLM Proteins

Alternative Splicing Coupled Nonsense-Mediated Decay Generates Neuronal Cell Type-Specific Expression of SLM Proteins
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选择性剪接耦合无义介导的衰变产生 SLM 蛋白的神经元细胞类型特异性表达

DOI:
10.1523/jneurosci.3395-14.2014
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发表时间:
2014
期刊:
The Journal of Neuroscience
影响因子:
--
通讯作者:
P. Scheiffele
P. Scheiffele
中科院分区:
--
文献类型:
--
作者:
Lisa Traunmüller;C. Bornmann;P. Scheiffele

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神经元群体独特的生理和形态特性对于神经元回路的适当功能至关重要。选择性剪接代表了一种有吸引力的机制,用于产生引导神经元发育和功能的细胞类型特异性分子库。然而,连接神经元的身份选择性剪接程序的机制知之甚少。我们报告说,细胞类型特异性,相互排斥的表达的两个选择性剪接调节,SLM1和SLM2,在小鼠海马是通过交叉抑制机制。SLM2在体内的缺失改变了它的副产物Slm1的选择性剪接并稳定了它的mRNA,导致在先前表达SLM2的细胞中表达SLM1。尽管SLM 1的这种异位上调,但SLM 2的缺失严重破坏了Nrxn 1、Nrxn 2和Nrxn 3的选择性剪接调节,突出表明这两个SLM旁系同源物具有部分不同的功能。我们的研究揭示了一个层次,SLM2依赖的机制,建立细胞类型特异性表达的神经元剪接调节剂在体内。
The unique physiological and morphological properties of neuronal populations are crucial for the appropriate functioning of neuronal circuits. Alternative splicing represents an attractive mechanism for generating cell type-specific molecular repertoires that steer neuronal development and function. However, the mechanisms that link neuronal identity to alternative splicing programs are poorly understood. We report that cell type-specific, mutually exclusive expression of two alternative splicing regulators, SLM1 and SLM2, in the mouse hippocampus is achieved by a cross-repression mechanism. Deletion of SLM2 in vivo modifies alternative splicing of its paralog Slm1 and stabilizes its mRNA, resulting in expression of SLM1 in previously SLM2-expressing cells. Despite this ectopic upregulation of SLM1, loss of SLM2 severely disrupts the alternative splicing regulation of Nrxn1, Nrxn2, and Nrxn3, highlighting that the two SLM paralogs have partially divergent functions. Our study uncovers a hierarchical, SLM2-dependent mechanism for establishing cell type-specific expression of neuronal splicing regulators in vivo.
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