运动神经元中的树突模式和连接性的目标诱导的转录控制由ETS基因Pea3进行
Eline Vrieseling1, Silvia Arber
1Biozentrum, Department of Cell Biology, University of Basel, Klingelbergstrasse 70, 4056 Basel, Switzerland.
Cell
|December 28, 2006
概括
脊柱运动神经元通过树突模式建立特定的连接. 由GDNF诱导的Pea3转录因子控制着树突的生长和运动神经元池中的感官输入选择性.
科学领域:
- 神经科学是一个神经科学.
- 发展生物学 发展生物学
- 脊髓研究研究 脊髓研究
背景情况:
- 神经元连接依赖于精确的轴突 - 树突位置来控制激活.
- 脊柱运动神经元 (MN) 连接到特定的肌肉,并从自感分支 (IaPA) 接收不同的输入.
- 在MN亚种群中控制选择性树突模式和输入特异性的机制尚未完全理解.
研究的目的:
- 研究脊柱运动神经元池是如何形成选择性树突模式的.
- 阐明IaPAs与特定MN池的选择性连接背后的分子机制.
- 识别控制树方向和感官输入特异性的遗传因素.
主要方法:
- 在不同脊柱运动神经元池中对状物形态的比较分析.
- 基因操纵以评估转录因子在MN发育中的作用.
- 电生理学记录以评估突触输入和响应延迟.
主要成果:
- 确定了两个不同的MN池树形态:放射性和那些避开中央灰质的树形态.
- 带有放射性树突的MN池表现出对感官刺激的单突触反应,与其他不同.
- 遗传证据表明,GDNF诱导的Pea3对于特定的宫MN池中的树突图案和IaPA连接至关重要.
结论:
- 目标衍生信号,如GDNF,诱导转录程序 (Pea3),这决定了MN树突的方向.
- 这些目标诱导的程序对于在脊髓中建立特定的感觉运动连接至关重要.
- 由转录因子控制的状结构在功能电路形成中起着关键作用.
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