Designing synthetic regulatory networks capable of self-organizing cell polarization.

Designing synthetic regulatory networks capable of self-organizing cell polarization.
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设计能够自组织细胞极化的合成调节网络。

DOI:
10.1016/j.cell.2012.08.040
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发表时间:
2012-10-12
期刊:
影响因子:
64.5
通讯作者:
Lim WA
Lim WA
中科院分区:
生物学1区
文献类型:
--
作者:
Chau AH;Walter JM;Gerardin J;Tang C;Lim WA

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细胞如何利用基因编码的分子规则形成全局的、自组织的结构仍然是难以捉摸的。在这里,我们采用合成生物学方法来研究控制细胞极化的设计原理。首先,使用粗粒度计算模型,我们搜索所有可能实现极化的简单网络。所有解决方案都包含三个最小基序之一——正反馈、相互抑制或具有正反馈的抑制剂。仅靠这些最小的图案就可以在有限的条件下实现极化;结合两个或多个这些基序的电路明显更加稳健。以这些设计原则为蓝图,我们使用嵌合信号蛋白工具包在酵母中实验构建了人工极化网络,该工具包在空间上指导磷脂酰肌醇(3,4,5)-三磷酸(PIP3)的合成和降解。具有组合基序的电路产生了清晰的合成 PIP3 焦点,可以持续近一个小时。因此,通过利用定位调节的信号分子,我们可以设计简单的分子电路来可靠地执行空间自组织程序。
How cells form global, self-organized structures using genetically encoded molecular rules remains elusive. Here, we take a synthetic biology approach to investigate the design principles governing cell polarization. First, using a coarse-grained computational model, we searched for all possible simple networks that can achieve polarization. All solutions contained one of three minimal motifs – positive feedback, mutual inhibition, or inhibitor with positive feedback. These minimal motifs alone could achieve polarization under limited conditions; circuits that combined two or more of these motifs were significantly more robust. With these design principles as a blueprint, we experimentally constructed artificial polarization networks in yeast, using a toolkit of chimeric signaling proteins that spatially direct the synthesis and degradation of phosphatidylinositol (3,4,5)-trisphosphate (PIP3). Circuits with combinatorial motifs yielded clear foci of synthetic PIP3 that can persist for nearly an hour. Thus, by harnessing localization-regulated signaling molecules, we can engineer simple molecular circuits that reliably execute spatial self-organized programs.
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