疯狂的边缘周期性口抑制是小细分时钟的基础
J K Dale1, M Maroto, M-L Dequeant
1Laboratoire de génétique et de physiologie du développement, Institut de biologie du développement de Marseille, France.
Nature
|January 17, 2003
概括
疯狂的边缘 (Lfng) 蛋白在胚胎中振荡,调节细分钟基因表达. 这一发现揭示了一个负反循环,这对于脊椎动物的身体规划发展至关重要.
科学领域:
- 发展生物学 发展生物学
- 分子生物学分子生物学
- 遗传学 是一个遗传学.
背景情况:
- 脊椎动物的细分是通过索米特形成开始的.
- 细分时钟,一个分子振荡器在介质体中皮肤,调节 somitogenesis 周期性.
- 这个时钟控制了与Notch路径相关的循环基因表达,但它的机制仍然不清楚.
研究的目的:
- 为了阐明细分钟的分子机制.
- 为了研究疯狂的边缘 (Lfng) 在somitogenesis中的作用.
- 了解Lfng如何影响循环基因表达和Notch信号传递.
主要方法:
- 研究了小前体质中皮的Lfng蛋白振荡.
- 过度表达的Lfng在对轴性中皮层中.
- 分析了Lfng操纵对循环基因表达和细分的影响.
主要成果:
- 发现 Lfng 蛋白在小的表皮质中发生振荡.
- Lfng过度表达破坏了循环基因表达,包括内源性Lfng.
- 过度表达导致了细分缺陷,模仿了Notch路径抑制.
结论:
- Lfng建立了一个负反循环,定期抑制Notch信号.
- 这种反循环对于循环基因的节奏表达至关重要.
- Lfng-Notch反循环为鸟类分段时钟提供了分子基础.
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