Direct roles of SPEECHLESS in the specification of stomatal self-renewing cells.

Direct roles of SPEECHLESS in the specification of stomatal self-renewing cells.
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DOI:
10.1126/science.1256888
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发表时间:
2014-09-26
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Bergmann DC
Bergmann DC
中科院分区:
其他
文献类型:
--
作者:
Lau OS;Davies KA;Chang J;Adrian J;Rowe MH;Ballenger CE;Bergmann DC

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谱系特异性干细胞对于多细胞生物中特定细胞类型和组织的产生和维持至关重要。在拟南芥中,气孔谱系细胞的起始和增殖是由碱性螺旋-环-螺旋转录因子SPEECHLESS (SPCH)控制的。 SPCH 驱动的不对称和自我更新分裂使气孔产生和整体器官生长具有灵活性。然而,SPCH 如何指导气孔谱系细胞行为尚不清楚。在这里,我们改进了染色质免疫沉淀 (ChIP) 测定,并对拟南芥 SPCH 体内的全基因组靶标进行了分析。我们发现 SPCH 控制细胞命运和不对称细胞分裂的关键调节因子,并调节对肽和植物激素介导的细胞间通讯的反应。我们的结果描绘了调节植物中必需的成体干细胞谱系的分子途径。
Lineage-specific stem cells are critical for the production and maintenance of specific cell types and tissues in multicellular organisms. In Arabidopsis, the initiation and proliferation of stomatal lineage cells is controlled by the basic helix-loop-helix transcription factor SPEECHLESS (SPCH). SPCH-driven asymmetric and self-renewing divisions allow flexibility in stomatal production and overall organ growth. How SPCH directs stomatal lineage cell behaviors, however, is unclear. Here, we improved the chromatin immunoprecipitation (ChIP) assay and profiled the genome-wide targets of Arabidopsis SPCH in vivo. We found that SPCH controls key regulators of cell fate and asymmetric cell divisions and modulates responsiveness to peptide and phytohormone-mediated intercellular communication. Our results delineate the molecular pathways that regulate an essential adult stem cell lineage in plants.
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