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首页> 外文期刊>The FEBS journal >'Big frog, small frog'--maintaining proportions in embryonic development: delivered on 2 July 2008 at the 33rd FEBS Congress in Athens, Greece
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'Big frog, small frog'--maintaining proportions in embryonic development: delivered on 2 July 2008 at the 33rd FEBS Congress in Athens, Greece

机译:“大青蛙,小青蛙”-保持胚胎发育的比例:2008年7月2日在希腊雅典举行的第33届FEBS大会上发表

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摘要

We discuss mechanisms that enable the scaling of pattern with size during the development of multicellular organisms. Recently, we analyzed scaling in the context of the early Xenopus embryo, focusing on the determination of the dorsal-ventral axis by a gradient of BMP activation. The ability of this system to withstand extreme perturbation was exemplified in classical experiments performed by Hans Spemann in the early 20th century. Quantitative analysis revealed that patterning is governed by a noncanonical 'shuttling-based' mechanism, and defined the feedback enabling the scaling of pattern with size. Robust scaling is due to molecular implementation of an integral-feedback controller, which adjusts the width of the BMP morphogen gradient with the size of the system. We present an 'expansion-repression' feedback topology which generalizes this concept for a wider range of patterning systems, providing a general, and potentially widely applicable model for the robust scaling of morphogen gradients with size.
机译:我们讨论了使多细胞生物体发育过程中模式随大小缩放的机制。最近,我们在非洲爪蟾早期胚胎的背景下分析了结垢,重点是通过BMP激活梯度确定背腹轴。汉斯·斯佩曼(Hans Spemann)在20世纪初期进行的经典实验证明了该系统抵御极端干扰的能力。定量分析表明,图案形成是受非规范的“基于梭动”的机制支配的,并定义了反馈,使得图案可以随尺寸缩放。稳健的缩放是由于积分反馈控制器的分子实现所致,该控制器会根据系统的大小来调整BMP形态发生剂梯度的宽度。我们提出了一种“扩展-抑制”反馈拓扑,该拓扑将这一概念推广到更广泛的构图系统中,从而为形态发生剂梯度随尺寸的鲁棒缩放提供了一个通用的,可能广泛适用的模型。

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