阿托纳尔是Drosophila光受体的proneural基因
A P Jarman1, E H Grell, L Ackerman
1Howard Hughes Medical Institute, University of California at San Francisco 94143-0724.
Nature
|June 2, 1994
概括
基因atonal (ato) 对于选择Drosophila眼中的第一个光受体 (R8) 是至关重要的. 这种亲神经机制与其他光感应器发育不同,突出显示了眼睛发育中的双重神经生成策略.
科学领域:
- 发育生物学 发展生物学
- 神经科学是一个神经科学.
- 遗传学 是一个遗传学.
背景情况:
- 果虫外周神经系统具有多种不同的感官元素,包括外部感官器官,弦体器官和光感受器.
- 脑前神经基因 (如阿切特-斯库特控制前体选择) 适用于外部感官器官,但不适用于弦体器官或光感受器.
- 这表明既未知的proneural基因或可替代的神经发生机制为chordotonal器官和光受体.
研究的目的:
- 为了研究负责Drosophila中光受体发育的proneural基因.
- 为了确定是否atonal (ato) 在光受体前体选择中发挥作用.
- 阐明Drosophila眼中的光受体模式形成背后的机制.
主要方法:
- 在Drosophila眼睛发育过程中分析了atonal (ato) 基因功能.
- 检查眼睛形象盘中的形态遗传的光受体形成.
- 研究在R8光受体选择和随后R1-7光受体发展中的作用.
主要成果:
- 鉴定出阿托纳尔 (ato) 是Drosophila中光受体发育必不可少的前神经基因.
- 对于R8光受体的选择而言,在形态遗传道上需要阿顿功能,R8光受体是第一个分化光受体.
- 虽然R1-7光受体的形成不需要直接的atonal,它取决于先前选择R8的atonal.
结论:
- 草虫的光受体发育利用了两种不同的机制:一种是通过atonal介导的R8选择的proneural机制,另一种是R1-7光受体的本地招募.
- 这项研究揭示了Drosophila复合眼中神经发生的双重策略,其中atonal起着关键作用.
- 这些发现有助于了解感官器官发育中的模式形成和细胞命运规范的遗传控制.
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