在Drosophila视觉系统中的随机和决定性规范之间的协调
Maximilien Courgeon1, Claude Desplan2
1Department of Biology, New York University, New York, NY 10003, USA.
Science (New York, N.Y.)
|October 5, 2019
概括
感官系统协调随机神经元命运与目标发育. 这项研究揭示了Drosophila R7光受体亚型如何与其精确指定的大脑点相匹配,确保正确的神经电路形成.
科学领域:
- 神经科学
- 发育生物学
- 遗传学
背景情况:
- 感官系统通过随机命运规范产生多种神经元类型.
- 随机神经元发育与确定性目标发育之间的协调仍然不清楚.
- 草R7光受体表现出随机的亚型规范,而它们的脑点则以决定性的方式发展.
研究的目的:
- 研究如何随机R7光受体亚型与它们在Drosophila中的确定性指定的脑标相匹配.
- 确定协调R7s及其Dm8神经元目标之间的神经元亚型匹配的机制.
主要方法:
- 特定于R7光受体亚型的Dm8神经元亚型的鉴定.
- 分析Dm8神经元的发育和过量产生.
- 在R7匹配后的Dm8神经元中对亡的研究.
- 在突触伴侣匹配中对细胞粘附分子Dpr11和DIPγ的功能分析.
主要成果:
- 确定了Dm8神经元的特定亚型,它们是R7光受体的目标.
- Dm8亚型由独立于R7发育的不同原始体决定性地产生.
- 超量Dm8神经元在与R7s相匹配后发生细胞亡.
- Dpr11和DIPγ细胞粘附分子对于匹配特定的R7-Dm8突触对至关重要.
结论:
- 现有机制可以确保随机指定的R7光受体和它们的决定性指定的Dm8目标之间的定性和定量匹配.
- 这种协调匹配允许视网膜中的随机神经细胞命运决定准确地传递给大脑,形成功能神经电路.
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