The many modes of flagellar and ciliary beating: Insights from a physical analysis
| Autor: | Kathleen A. Lesich, Charles B. Lindemann |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Axoneme
Dynein Bending Review Article Flagellum Biology sperm 03 medical and health sciences 0302 clinical medicine Planar Structural Biology Cilia Review Articles Cytoskeleton 030304 developmental biology 0303 health sciences doublets dynein Plane (geometry) Cilium Torsion (mechanics) Dyneins Cell Biology Classical mechanics Flagella central pair 030217 neurology & neurosurgery |
| Zdroj: | Cytoskeleton (Hoboken, N.j.) |
| ISSN: | 1949-3592 |
| Popis: | The mechanism that allows the axoneme of eukaryotic cilia and flagella to produce both helical and planar beating is an enduring puzzle. The nine outer doublets of eukaryotic cilia and flagella are arranged in a circle. Therefore, each doublet pair with its associated dynein motors, should produce torque to bend the flagellum in a different direction. Sequential activation of each doublet pair should, therefore result in a helical bending wave. In reality, most cilia and flagella have a well‐defined bending plane and many exhibit an almost perfectly flat (planar) beating pattern. In this analysis we examine the physics that governs flagellar bending, and arrive at two distinct possibilities that could explain the mechanism of planar beating. Of these, the mechanism with the best observational support is that the flagellum behaves as two ribbons of doublets interacting with a central partition. We also examine the physics of torsion in flagella and conclude that torsion could play a role in transitioning from a planar to a helical beating modality in long flagella. Lastly, we suggest some tests that would provide theoretical and/or experimental evaluation of our proposals. |
| Databáze: | OpenAIRE |
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