Nonlinear amplitude dynamics in flagellar beating

David Oriola, Hermes Gadêlha, Jaume Casademunt

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

The physical basis of flagellar and ciliary beating is a major problem in biology which is still far from completely understood. The fundamental cytoskeleton structure of cilia and flagella is the axoneme, a cylindrical array of microtubule doublets connected by passive cross-linkers and dynein motor proteins. The complex interplay of these elements leads to the generation of self-organized bending waves. Although many mathematical models have been proposed to understand this process, few attempts have been made to assess the role of dyneins on the nonlinear nature of the axoneme. Here, we investigate the nonlinear dynamics of flagella by considering an axonemal sliding control mechanism for dynein activity. This approach unveils the nonlinear selection of the oscillation amplitudes, which are typically either missed or prescribed in mathematical models. The explicit set of nonlinear equations are derived and solved numerically. Our analysis reveals the spatio-temporal dynamics of dynein populations and flagellum shape for different regimes of motor activity, medium viscosity and flagellum elasticity. Unstable modes saturate via the coupling of dynein kinetics and flagellum shape without the need of invoking a nonlinear axonemal response. Hence, our work reveals a novel mechanism for the saturation of unstable modes in axonemal beating.
Original languageEnglish
Number of pages13
JournalRoyal Society Open Science
Volume4
Issue number3
Early online date8 Mar 2017
DOIs
Publication statusPublished - Mar 2017

Keywords

  • self-organization
  • spermatozoa
  • flagellar beating
  • dynein

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