SAM68 regulates neuronal activity-dependent alternative splicing of neurexin-1.

SAM68 regulates neuronal activity-dependent alternative splicing of neurexin-1.
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DOI:
10.1016/j.cell.2011.11.028
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发表时间:
2011-12-23
期刊:
影响因子:
64.5
通讯作者:
Scheiffele P
Scheiffele P
中科院分区:
生物学1区
文献类型:
--
作者:
Iijima T;Wu K;Witte H;Hanno-Iijima Y;Glatter T;Richard S;Scheiffele P

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突触和神经元回路的组装依赖于一系列分子识别事件及其通过神经元活动的修改。神经毒素是一个高度多态性的突触受体家族,通过广泛的选择性剪接而多样化。神经毒素变体表现出独特的异构体特异性生化相互作用和突触组装功能,但控制剪接异构体选择的机制尚不清楚。我们证明 Nrxn1 选择性剪接在小鼠大脑中受到时间和空间控制。神经元活动通过钙/钙调蛋白依赖性激酶 IV 信号传导触发 Nrxn1 剪接异构体选择的转变。 Nrxn1 的活性依赖性选择性剪接需要 KH 结构域 RNA 结合蛋白 SAM68,该蛋白与 Nrxn1 前 mRNA 中的 RNA 反应元件结合。我们的研究结果表明 SAM68 是中枢神经系统中 Nrxn1 分子多样性和活性依赖性选择性剪接动态控制的关键调节因子。
The assembly of synapses and neuronal circuits relies on an array of molecular recognition events and their modification by neuronal activity. Neurexins are a highly polymorphic family of synaptic receptors diversified by extensive alternative splicing. Neurexin variants exhibit distinct isoform-specific biochemical interactions and synapse assembly functions but the mechanisms governing splice isoform choice are not understood. We demonstrate that Nrxn1 alternative splicing is temporally and spatially controlled in the mouse brain. Neuronal activity triggers a shift in Nrxn1 splice isoform choice via calcium/calmodulin-dependent kinase IV signaling. Activity-dependent alternative splicing of Nrxn1 requires the KH-domain RNA binding protein SAM68 which associates with RNA response elements in the Nrxn1 pre-mRNA. Our findings uncover SAM68 as a key regulator of dynamic control of Nrxn1 molecular diversity and activity-dependent alternative splicing in the central nervous system.
去极化和CAM激酶IV通过两个必需的RNA元素调节NMDA受体剪接。
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