细胞周期基因的时空调节通过 SHORTROOT 链接模式和生长
R Sozzani1, H Cui, M A Moreno-Risueno
1Department of Biology and IGSP Center for Systems Biology, Duke University, Durham, North Carolina 27708, USA.
Nature
|July 3, 2010
概括
植物的发育需要受控的细胞分裂. SHORTROOT (SHR) 和SCARECROW (SCR) 直接激活D型循环蛋白,调节形成性细胞分裂,这对于Arabidopsis的根基组织模式至关重要.
科学领域:
- 植物发育生物学植物发育生物学
- 分子遗传学 分子遗传学
- 细胞周期调节细胞周期调节
背景情况:
- 多细胞生物的发育依赖于协调的细胞分裂来实现生长和模式.
- 模式形成的分子机制,特别是形成性细胞分裂,尚未完全理解.
- 在阿拉比多普西斯,根基组织的形成涉及SHORTROOT (SHR) 和SCARECROW (SCR) 蛋白质.
研究的目的:
- 阐明SHR和SCR调节Arabidopsis根发育中的形成性细胞分裂的分子机制.
- 研究特定细胞周期基因在SHR/SCR介导的模式形成中的作用.
主要方法:
- 细胞类型特定的SHR和SCR的转录概况.
- 基于染色体免疫沉的微阵列 (ChIP-chip) 实验.
- 在改变D型环林表达时形成性分裂缺陷的分析.
主要成果:
- SHR和SCR直接以时空方式激活特定的细胞分裂基因.
- 在关键形成分裂开始时,SHR和SCR直接激活D型环林基因.
- 调节D型环林表达导致形成性划分和根模式的缺陷.
结论:
- 植物的模式形成是通过精确的细胞循环基因的转录控制来实现的.
- SHR和SCR直接将发育调节与器官模式的细胞循环机制联系起来.
- 这项研究揭示了连接发育调节器,细胞循环组件和器官模式的直接机制.
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