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:
影响因子:
--
通讯作者:
P. Scheiffele
中科院分区:
文献类型:
--
作者:
Lisa Traunmüller;C. Bornmann;P. Scheiffele
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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