Abstract
A quantitative description of the molecular networks that sustain morphogenesis is one of the main challenges of developmental biology. In particular, a molecular understanding of the segmentation of the antero-posterior axis in vertebrates has yet to be achieved. This process known as somitogenesis is believed to result from the interactions between a well-studied genetic oscillator and a less established posterior-moving determination wavefront. Here we describe a molecular model for somitogenesis that couples a moving morphogen wavefront with the somitogenetic oscillator. The wavefront is due to a switch between stable states that results from reciprocal negative feedbacks of Retinoic Acid (RA) on the activation of a kinase ErK and of ErK on RA synthesis. We suggest a molecular mechanism by which that switch can be triggered by the somitogenetic clock. The model quantitatively accounts for the shortening of the pre-somitic mesoderm (PSM) in zebrafish in response to the decrease during somitogenesis in the concentration of a morphogen (Fgf8). The generality and robustness of the model allows for its validation (or invalidation) in other model organisms.
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Acknowledgements
We thank A.Goldbeter and V.Hakim for constructive criticism of our model. This work was partially supported by Grants ANR-10-LABX-54 MEMO LIFE and ANR-11-IDEX-0001-02 PSL* Research University and PSL Grants SuperLINE and MicroGUT.
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Zhang, W., Mayr, V., Ducos, B. et al. A Model of Somitogenesis. J Stat Phys 175, 729–742 (2019). https://doi.org/10.1007/s10955-019-02265-9
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DOI: https://doi.org/10.1007/s10955-019-02265-9