The vertebral column and skeletal musculature derive from embryonic structures called somites, which form sequentially from head to tail. Normal musculoskeletal development requires the correct number of cells in each somite and that each somite acquires its correct axial address. Perturbations can lead to malformations of the spine ranging from complete disarray of the vertebral elements (e.g. spondylocostal and spondylothoracic dysostoses and dysplasias) to deviations of the spine (lordosis, kyphosis, and scoliosis) and misspecification of the regional identity of skeletal elements (e.g. Klippel-Feil syndrome). Research in the last two decades has uncovered molecular oscillators and gradients of growth factors hypothesized to control somite size and identity. However, little is known about how (or if) these molecular players relate to cell behaviors like cell adhesion, proliferation and migration that result in somite patterning. In part this uncertainty is due to the spatiotemporal complexity of somitogenesis, the number of mechanisms involved and the relative lack of cross-talk between model and experiment in the past. This project undertakes a multiscale approach to address all three issues. The NIH-led Interagency Modeling and Analysis Group (IMAG) has identified as key goals the development of open-source, multi-scale biological simulation environments and the deployment of demonstration projects that integrate models operating at different scales. This project will build comprehensive 3D multiscale predictive models of vertebrate somitogenesis able to generate and test specific hypotheses concerning the mechanisms of interspecies differences (as a model of individual to individual variability and robustness) and perturbations. It will refine a tissue simulation environment (CC3D) to improve its usability to the community, perform new biological experiments to collect data as inputs for 3D somitogenesis models and to test model predictions, and deploy models and experimental data using emerging standards for sharing of multicellular information (CBO, CBMSL). Specifically, it will: 1) develop new 3D models to integrate behaviors at molecular, cellular and tissue scales to reproduce the normal dynamics of segmentation and test them by quantitative measurements using advanced time-lapse fluorescence microscopy and microfluidics-based gradient-cell technology;2) use a novel experimental paradigm that allows segmentation to be studied independently of the molecular "segmentation clock", for challenging and validating the segmentation models;3) extend the models and experiments to understand how somites acquire positional identities and 4) open-source release data and models in sharable formats. In addition to generating a predictive model for vertebral column development and its anomalies, this project should enable future studies of the development of other organs and establish the role of multi-scale modeling in biomedical science. Its emphasis on model and data share ability will promote efficient sharing of resources, tools and models among biomodelers and experimentalists, significantly reducing duplication of effort.
Errors in somite segmentation during embryogenesis can lead to malformations and deviations of the spine (e.g., scoliosis, lordosis, kyphosis, spondylocostal and spondylothoracic dysostoses and dysplasias and Klippel-Feil syndrome). Surprisingly little is known about the mechanisms that control somite size, shape, axial identity and pattern in normal development, and consequently about the etiology of congenital disorders of the spine. This project closely couples modeling at multiple scales (molecules, cells, and tissue and body pattern) with novel experimental approaches to validation to produce models that will elucidate disease etiology and identify candidates for genetic screening and diagnostic methods.
|Dias, Ana S; de Almeida, Irene; Belmonte, Julio M et al. (2014) Somites without a clock. Science 343:791-5|
|Sluka, James P; Shirinifard, Abbas; Swat, Maciej et al. (2014) The cell behavior ontology: describing the intrinsic biological behaviors of real and model cells seen as active agents. Bioinformatics 30:2367-74|
|Wynn, Michelle L; Rupp, Paul; Trainor, Paul A et al. (2013) Follow-the-leader cell migration requires biased cell-cell contact and local microenvironmental signals. Phys Biol 10:035003|
|Swat, Maciej H; Thomas, Gilberto L; Belmonte, Julio M et al. (2012) Multi-scale modeling of tissues using CompuCell3D. Methods Cell Biol 110:325-66|
|Wynn, Michelle L; Kulesa, Paul M; Schnell, Santiago (2012) Computational modelling of cell chain migration reveals mechanisms that sustain follow-the-leader behaviour. J R Soc Interface 9:1576-88|
|Andasari, Vivi; Roper, Ryan T; Swat, Maciej H et al. (2012) Integrating intracellular dynamics using CompuCell3D and Bionetsolver: applications to multiscale modelling of cancer cell growth and invasion. PLoS One 7:e33726|
|Hester, Susan D; Belmonte, Julio M; Gens, J Scott et al. (2011) A multi-cell, multi-scale model of vertebrate segmentation and somite formation. PLoS Comput Biol 7:e1002155|
|Zhang, Ying; Thomas, Gilberto L; Swat, Maciej et al. (2011) Computer simulations of cell sorting due to differential adhesion. PLoS One 6:e24999|
|Szabo, A; Rupp, P A; Rongish, B J et al. (2011) Extracellular matrix fluctuations during early embryogenesis. Phys Biol 8:045006|
|Flach, Edward H; Schnell, Santiago (2010) Stability of open pathways. Math Biosci 228:147-52|
Showing the most recent 10 out of 43 publications