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Biophysical Characterization of Flagellar Motor Functions
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Flagellar synchronization through direct hydrodynamic interactions.

Douglas R Brumley1, Kirsty Y Wan2, Marco Polin1

  • 1Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, United Kingdom Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, United States.

Elife
|July 31, 2014
PubMed
Summary
This summary is machine-generated.

Hydrodynamic coupling between flagella enables robust synchrony in Volvox carteri cells, even with different beating frequencies. This fluid-mediated interaction is key to coordinated movement and cellular functions.

Keywords:
Volvoxflagellasynchronization

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Area of Science:

  • Biophysics
  • Cell Biology
  • Fluid Dynamics

Background:

  • Coordinated beating of multiple flagella is essential for cellular functions like motility and development.
  • The underlying mechanisms of flagellar synchrony, particularly in the absence of direct cellular connections, are not fully understood.
  • Hydrodynamic interactions are hypothesized to play a significant role in coordinating flagellar activity.

Purpose of the Study:

  • To experimentally investigate the role of hydrodynamic coupling in flagellar synchrony.
  • To determine how flagellar separation, orientation, and intrinsic beating frequencies influence coordinated motion.
  • To provide unequivocal proof of fluid-mediated flagellar synchronization.

Main Methods:

  • Utilized high-speed imaging to study two micropipette-held somatic cells of Volvox carteri.
  • Manipulated cell separation and relative flagellar orientation to analyze hydrodynamic coupling effects.
  • Employed precise flagellar tracking to detect waveform changes and quantify synchrony over time.

Main Results:

  • Demonstrated that hydrodynamic coupling between flagella can achieve robust synchrony, even with differing intrinsic beating frequencies.
  • Observed spatial dependence of interflagellar coupling, with synchrony degrading at greater separations due to stochastic processes.
  • Identified in-phase and antiphase flagellar states, consistent with theoretical predictions, influenced by relative flagellar orientation.

Conclusions:

  • Flagella coupled solely through fluid dynamics can achieve robust, long-term synchrony.
  • Hydrodynamic forces are sufficient to overcome differences in intrinsic flagellar properties for coordinated beating.
  • This study elucidates a fundamental mechanism for collective flagellar coordination in biological systems.