论文标题
在体内生成时钟中停滞振荡的混合反应扩散和时钟和波前模型
Hybrid reaction-diffusion and clock-and-wavefront model for the arrest of oscillations in the somitogenesis segmentation clock
论文作者
论文摘要
时钟和波前范式可以说是解释胚胎生成过程的最广泛接受的模型。根据该模型,体内发生是基于遗传振荡器(称为分割时钟)与分化波前之间的相互作用,该波浪提供了指示每对分别形成每对情节的位置信息。在引入时钟和波前范式之后不久,Meinhardt在概念上提出了一个概念上不同的数学模型,尤其是形态发生,尤其是生殖。最近,Cotterell等人。通过系统地列举和研究执行分割的小型网络,重新发现了同等模型。 Cotterell等。称其为进行性振荡反应扩散(PORD)模型。在Meinhardt-pord模型中,体积发生是由短程相互作用驱动的,前部的后部运动是一种局部的新兴现象,不受全局位置信息的控制。使用此模型,可以解释一些与时钟和波前模型不兼容的实验观察结果。但是,Meinhardt-Pord模型本身具有一些重要的缺点。也就是说,它对波动非常敏感,并取决于非常具体的初始条件(这在生物学上不现实)。在这项工作中,我们提出了一个等效的meinhardt-pord模型,然后对其进行修改,将其与一个由递增的形态梯度组成的波前进行对。通过这样做,我们在Meinhardt-Pord和Clock-WaveFront的模型之间获得了混合模型,该模型克服了两个原始模型的大部分缺陷。
The clock and wavefront paradigm is arguably the most widely accepted model for explaining the embryonic process of somitogenesis. According to this model, somitogenesis is based upon the interaction between a genetic oscillator, known as segmentation clock, and a differentiation wavefront, which provides the positional information indicating where each pair of somites is formed. Shortly after the clock and wavefront paradigm was introduced, Meinhardt presented a conceptually different mathematical model for morphogenesis in general, and somitogenesis in particular. Recently, Cotterell et al. rediscovered an equivalent model by systematically enumerating and studying small networks performing segmentation. Cotterell et al. called it a progressive oscillatory reaction-diffusion (PORD) model. In the Meinhardt- PORD model, somitogenesis is driven by short-range interactions and the posterior movement of the front is a local, emergent phenomenon, which is not controlled by global positional information. With this model, it is possible to explain some experimental observations that are incompatible with the clock and wavefront model. However the Meinhardt-PORD model has some important disadvantages of its own. Namely, it is quite sensitive to fluctuations and depends on very specific initial conditions (which are not biologically realistic). In this work, we propose an equivalent Meinhardt-PORD model, and then amend it to couple it with a wavefront consisting of a receding morphogen gradient. By doing so, we get a hybrid model between the Meinhardt-PORD and the clock-and-wavefront ones, which overcomes most of the deficiencies of the two originating models.