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通过直接调节细胞因素诱导反应调节器,WUSCHEL控制了细胞系统的功能
Andrea Leibfried1, Jennifer P C To, Wolfgang Busch
1Max Planck Institute for Developmental Biology, AG Lohmann, D-72076 Tübingen, Germany.
Nature
|December 24, 2005
概括
在植物中,WUSCHEL (WUS) 蛋白抑制细胞因素信号基因 (ARR). 这种抑制对于维持干细胞种群在发芽角干细胞系统中至关重要,以确保适当的植物发育.
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.
- 分子遗传学 分子遗传学
背景情况:
- 植物发芽的顶端干细胞系统 (SAM) 携带干细胞进行连续生长.
- 克拉瓦塔 (CLV) /乌舍尔 (WUS) 网络和植物激素调节SAM干细胞的命运.
- 细胞因素信号传递,涉及RABIDOPSIS RESPONSE REGULATOR (ARR) 基因,形成了美系统调节中的负反循环.
研究的目的:
- 研究CLV/WUS网络与SAM的激素控制之间的机制联系.
- 确定WUS在调节细胞因素信号组件中的作用.
- 阐明WUS介导的ARR基因抑制如何影响美里系统功能.
主要方法:
- 对WUSCHEL (WUS) 的直接转录压制目标的分析.
- 对阿拉比多普西斯反应调节器 (ARR) 基因 (ARR5,ARR6,ARR7,ARR15) 的基因表达分析.
- 对具有改变ARR7功能和玉米ARR同类物质的阿拉比多普西斯突变体的表型分析.
主要成果:
- 武舍尔 (WUS) 直接抑制ARR5,ARR6,ARR7和ARR15的转录.
- 建议通过WUS抑制ARR基因对于维持干细胞种群至关重要.
- 一种构成性活跃的ARR7突变导致异常发芽的顶端干细胞系统,而一种玉米ARR功能丧失突变则表现出扩大的干细胞系统.
结论:
- 伍舍尔 (WUS) 直接将CLV/WUS干细胞调节网络与细胞因素信号连接起来.
- 负细胞因子反调节器 (ARRs) 的WUS介导的抑制对于适当的射击角髓系统功能和大小至关重要.
- 这种调控机制确保了干细胞增殖和分化之间的平衡.
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