Fundamental origins and limits for scaling a maternal morphogen gradient.

Fundamental origins and limits for scaling a maternal morphogen gradient.
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母体形态发生素梯度缩放的基本起源和限制

DOI:
10.1038/ncomms7679
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发表时间:
2015-03-26
影响因子:
16.6
通讯作者:
Ma, Jun
Ma, Jun
中科院分区:
综合性期刊1区
文献类型:
--
作者:
He, Feng;Wei, Chuanxian;Wu, Honggang;Cheung, David;Jiao, Renjie;Ma, Jun

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组织扩张和图案化对发育是不可或缺的;然而,从数量上讲,母亲如何积累分子资源以投资于指导强大的胚胎图案化的未来,还是个未知数。在这里,我们发展了一个模型,组织扩张调制的母体形态标尺(TEM3S),以研究果蝇胚胎中标尺的前后部模式。使用卵巢和胚胎,我们测量了模型的一个核心量,即双体(BCD)形态原梯度的幅值A的标度能力。我们还直接评估了由模型得出的关于BCD梯度和图案化属性的预测。我们的结果表明,胚胎中BCD梯度的比例来自于母体组织扩张和卵巢中BCD基因拷贝数扩张之间的动态关系,并从根本上受到这种关系的制约。生命周期的两个过渡阶段之间的这种微妙的联系,源于有限的nA~3值,强调了TEM3S所描述的发育系统的一个关键特征。
Tissue expansion and patterning are integral to development; however, it is unknown quantitatively how a mother accumulates molecular resources to invest in the future of instructing robust embryonic patterning. Here we develop a model, Tissue Expansion-Modulated Maternal Morphogen Scaling (TEM3S), to study scaled anterior–posterior patterning inDrosophilaembryos. Using both ovaries and embryos, we measure a core quantity of the model, the scaling power of the Bicoid (Bcd) morphogen gradient’s amplitudenA. We also evaluate directly model-derived predictions about Bcd gradient and patterning properties. Our results show that scaling of the Bcd gradient in the embryo originates from, and is constrained fundamentally by, a dynamic relationship between maternal tissue expansion andbcdgene copy number expansion in the ovary. This delicate connection between the two transitioning stages of a life cycle, stemming from a finite value ofnA~3, underscores a key feature of developmental systems depicted by TEM3S.
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