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XB-ART-3417
Dev Biol July 1, 2004; 271 (1): 210-22.

Multicellular computer simulation of morphogenesis: blastocoel roof thinning and matrix assembly in Xenopus laevis.

Longo D , Peirce SM , Skalak TC , Davidson L , Marsden M , Dzamba B , DeSimone DW .


Abstract
In the blastocoel roof (BCR) of the Xenopus laevis embryo, epibolic movements are driven by the radial intercalation of deep cell layers and the coordinate spreading of the overlying superficial cell layer. Thinning of the lateral margins of the BCR by radial intercalation requires fibronectin (FN), which is produced and assembled into fibrils by the inner deep cell layer of the BCR. A cellular automata (CA) computer model was developed to analyze the spatial and temporal movements of BCR cells during epiboly. Simulation parameters were defined based on published data and independent results detailing initial tissue geometry, cell numbers, cell intercalation rates, and migration rates. Hypotheses regarding differential cell adhesion and FN assembly were also considered in setting system parameters. A 2-dimensional model simulation was developed that predicts BCR thinning time of 4.8 h, which closely approximates the time required for the completion of gastrulation in vivo. Additionally, the model predicts a temporal increase in FN matrix assembly that parallels fibrillogenesis in the embryo. The model is capable of independent predictions of cell rearrangements during epiboly, and here was used to predict successfully the lateral dispersion of a patch of cells implanted in the BCR, and increased assembly of FN matrix following inhibition of radial intercalation by N-cadherin over-expression.

PubMed ID: 15196962
Article link: Dev Biol
Grant support: [+]

Species referenced: Xenopus laevis
Genes referenced: bcr cdh2 cdh3 fn1 myc
Antibodies: Cdh3 Ab1 Fn1 Ab1


Article Images: [+] show captions