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Cinemechanometry (CMM): A Method to Determine the Forces that Drive Morphogenetic Movements from Time-Lapse Images

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Abstract

Although cell-level mechanical forces are crucial to tissue self-organization in contexts ranging from embryo development to cancer metastases to regenerative engineering, the absence of methods to map them over time has been a major obstacle to new understanding. Here, we present a technique for constructing detailed, dynamic maps of the forces driving morphogenetic events from time-lapse images. Forces in the cell are considered to be separable into unknown active driving forces and known passive forces, where actomyosin systems and microtubules contribute primarily to the first group and intermediate filaments and cytoplasm to the latter. A finite-element procedure is used to estimate the field of forces that must be applied to the passive components to produce their observed incremental deformations. This field is assumed to be generated by active forces resolved along user-defined line segments whose location, often along cell edges, is informed by the underlying biology. The magnitudes and signs of these forces are determined by a mathematical inverse method. The efficacy of the approach is demonstrated using noisy synthetic data from a cross section of a generic invagination and from a planar aggregate that involves two cell types, edge forces that vary with time and a neighbor change.

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Acknowledgments

Funding for this project was provided by the Human Frontiers Science Program (HFSP). The authors thank Shane Hutson and Vito Conte for helpful discussions related to the manuscript.

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Authors and Affiliations

  1. Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, Canada

    P. Graham Cranston, Jim H. Veldhuis, Sriram Narasimhan & G. Wayne Brodland

  2. Department of Biology, University of Waterloo, Waterloo, ON, N2L 3G1, Canada

    G. Wayne Brodland

Authors
  1. P. Graham Cranston
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  2. Jim H. Veldhuis
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  3. Sriram Narasimhan
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  4. G. Wayne Brodland
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Correspondence to G. Wayne Brodland.

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Associate Editor Michael S. Detamore oversaw the review of this article.

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Cranston, P.G., Veldhuis, J.H., Narasimhan, S. et al. Cinemechanometry (CMM): A Method to Determine the Forces that Drive Morphogenetic Movements from Time-Lapse Images. Ann Biomed Eng 38, 2937–2947 (2010). https://doi.org/10.1007/s10439-010-9998-1

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  • DOI: https://doi.org/10.1007/s10439-010-9998-1

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