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An Integrative Computational Model of Multiciliary Beating

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Abstract

The coordinated beating of motile cilia is responsible for ovum transport in the oviduct, transport of mucus in the respiratory tract, and is the basis of motility in many single-celled organisms. The beating of a single motile cilium is achieved by the ATP-driven activation cycles of thousands of dynein molecular motors that cause neighboring microtubule doublets within the ciliary axoneme to slide relative to each other. The precise nature of the spatial and temporal coordination of these individual motors is still not completely understood. The emergent geometry and dynamics of ciliary beating is a consequence of the coupling of these internal force-generating motors, the passive elastic properties of the axonemal structure, and the external viscous, incompressible fluid. Here, we extend our integrative model of a single cilium that couples internal force generation with the surrounding fluid to the investigation of multiciliary interaction. This computational model allows us to predict the geometry of beating, along with the detailed description of the time-dependent flow field both near and away from the cilia. We show that synchrony and metachrony can, indeed, arise from hydrodynamic coupling. We also investigate the effects of viscosity and neighboring cilia on ciliary beat frequency. Moreover, since we have precise flow information, we also measure the dependence of the total flow pumped per cilium per beat upon parameters such as viscosity and ciliary spacing.

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Authors and Affiliations

  1. Center for Computational Science, Tulane University, New Orleans, LA, 70118, USA

    Xingzhou Yang

  2. Department of Mathematics, Washington State University, Pullman, WA, 99163, USA

    Robert H. Dillon

  3. Department of Mathematics, Tulane University, New Orleans, LA, 70118, USA

    Lisa J. Fauci

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  1. Xingzhou Yang
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  2. Robert H. Dillon
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Correspondence to Xingzhou Yang.

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Yang, X., Dillon, R.H. & Fauci, L.J. An Integrative Computational Model of Multiciliary Beating. Bull. Math. Biol. 70, 1192–1215 (2008). https://doi.org/10.1007/s11538-008-9296-3

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