假定转录因子SHR在根模式中的细胞间运动
1Department of Biology, New York University, New York, New York 10003, USA.
Nature
|September 21, 2001
概括
短根蛋白 (SHR) 从细胞移动到邻近的细胞,调节植物根的发育. 这种信号传递对于细胞分裂至关重要,并确定了Arabidopsis的内皮细胞命运.
科学领域:
- 植物生物学 植物生物学
- 发育生物学是发展生物学.
- 遗传学 是一个遗传学.
背景情况:
- 植物的发育依赖于位置信息,但信号机制尚不清楚.
- 阿拉比多普西斯的根辐射模式是通过细胞分裂和命运获取而形成的.
- 短根 (shr) 突变体在皮质/内皮体发育和内皮体特异性方面表现出缺陷.
研究的目的:
- 研究短根 (SHR) 基因及其蛋白质产物在阿拉比多普西斯根发育中的作用.
- 阐明植物根中的细胞命运决定的信号机制.
主要方法:
- 对缩小突变的分析,以观察发育缺陷.
- 对SHRmRNA和蛋白质进行局部化研究.
- 使用SCARECROW (SCR) 促销器进行子宫外表达实验.
主要成果:
- SHR蛋白非细胞自主地从细胞移动到邻近的细胞,进入细胞核.
- 宫外SHR表达导致自身催化信号,改变细胞命运和增加细胞层.
- SHR对于内皮体的特异化和皮质/内皮体初始子细胞分裂至关重要.
结论:
- SHR蛋白作为来自石碑的移动信号.
- SHR是一个关键的调节器,激活内皮细胞命运和SCR介导的细胞分裂.
- 提出了一个模型,其中SHR既作为信号,又作为发育途径的诱导作用.
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