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The ciliary structures were first seen in 1647 by Antonie Leeuwenhoek while observing the protozoans. In lower organisms, these appendages are responsible for cell movement, while in higher organisms, these appendages help in the movement of the extracellular fluids within the body cavities.
The cilia are made up of microtubules in a 9+2 arrangement, with nine microtubule doublet ring bundles, surrounding a pair of central singlet microtubule bundles. The doublet microtubule bundles are...
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Hydrodynamic phase locking in mouse node cilia.

Atsuko Takamatsu1, Kyosuke Shinohara2, Takuji Ishikawa3

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Mouse node cilia rotation creates leftward fluid flow crucial for embryonic left-right determination. Cooperative movement, even with just two cilia, is sufficient, with nonidentical cilia achieving synchronized states more readily.

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Area of Science:

  • Developmental biology
  • Biophysics
  • Fluid dynamics

Background:

  • Cilia-driven fluid flow in the node cavity is essential for establishing left-right asymmetry in vertebrate embryos.
  • While previously thought to require numerous cilia, recent studies suggest two cilia may suffice for initiating this process.

Purpose of the Study:

  • To investigate the cooperative dynamics of cilia movement through hydrodynamic interactions.
  • To determine the conditions under which cilia achieve phase-locked states for effective fluid propulsion.

Main Methods:

  • Computational modeling of cilia hydrodynamics.
  • Analysis of phase-locking phenomena in systems of two cilia.

Main Results:

  • Cilia exhibit cooperative movement, achieving phase-locked states with specific relative phases.
  • A system with two nonidentical cilia reaches phase-locked states more easily than a system with identical cilia.

Conclusions:

  • Hydrodynamic interactions facilitate cooperative cilia function, even with a minimal number of cilia.
  • Cilia asymmetry can enhance the efficiency of achieving coordinated movement for developmental signaling.