PQM-1补充了DAF-16,作为DAF-2中介发育和寿命的关键转录调节剂
Ronald G Tepper1, Jasmine Ashraf2, Rachel Kaletsky2
1Department of Biological Sciences, Columbia University, New York, NY 10027, USA.
Cell
|August 6, 2013
概括
降低胰岛素/IGF-1类信号传导 (IIS) 通过改变基因表达来延长寿命. 这项研究确定PQM-1是控制发育基因的关键因素,揭示了在调节压力和衰老方面与DAF-16的对抗关系.
科学领域:
- 遗传学和分子生物学
- 衰老研究研究 衰老研究
- 发展生物学 发展生物学
背景情况:
- 已知减少的胰岛素/IGF-1类信号传导 (IIS) 可以延长模型生物的寿命.
- 这种寿命延长是由DAF-16/FOXO转录因子调节的,该转录因子调节应激反应 (I类) 和发育 (II类) 基因.
- 通过DAF-16控制这些基因类的精确机制以及涉及的因素仍然不完全理解.
研究的目的:
- 确定负责调节IIS下游发展 (II类) 基因的转录激活剂.
- 在衰老和发育的背景下阐明PQM-1,DAF-16和IIS之间的关系.
- 了解关键转录因子的核定位如何随着年龄和IIS水平的变化.
主要方法:
- 整合全基因组的mRNA表达数据与C. elegans的全基因组转录因子结合数据.
- ChIP-seq分析以绘制转录因子的体内结合位点的地图.
- 对基因表达变化的分析,以应对改变的IIS和转录因子活性.
- 使用显微镜和基因操纵评估转录因子的核定位.
主要成果:
- PQM-1被确定为转录激活剂,直接与DAF-16-关联元素 (DAE) 结合,以控制发育 (II类) 基因.
- DAF-16通过DAF-16结合元件 (DBE) 直接调节I类基因,而PQM-1则调节II类基因.
- 失去PQM-1功能会抑制IIS介导的寿命,并减缓发育.
- PQM-1和DAF-16的核定位由IIS反向调节,它们表现出相互对抗的定位.
- 随着年龄的增长,核PQM-1的逐渐丧失与其目标基因表达的下降有关.
结论:
- PQM-1是发育基因的关键转录激活剂,在对IIS的反应中对DAF-16产生对抗作用.
- IIS对PQM-1和DAF-16核定位的对立调节提供了一个平衡应激反应和发展的机制.
- 随着年龄的增长,核PQM-1的损失会导致其目标基因在衰老过程中表达的下降.
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