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Published on: December 16, 2015
Developmentally programmed changes in cytoplasmic mechanics revealed by active microrheology in C. elegans embryos
Saaya Koizumi1,2, Ayama Tokuyasu3, Akinori W M Miyamoto3
1Genetics Program, Graduate Institute for Advanced Studies, SOKENDAI, Mishima, Japan.
Biorxiv : the Preprint Server for Biology
|June 4, 2026
Summary
Cytoplasmic mechanics stiffen during early development in Caenorhabditis elegans embryogenesis. This programmed stiffening occurs independently of cell division geometry, revealing dynamic changes in the cellular environment.
Area of Science:
- Developmental Biology
- Cell Biology
- Biophysics
Background:
- Cytoplasmic mechanical properties are typically assumed constant.
- Systematic changes in these properties during development are not well understood.
Purpose of the Study:
- To investigate developmental changes in cytoplasmic mechanics during early Caenorhabditis elegans embryogenesis.
- To determine if these changes are linked to cell division geometry.
Main Methods:
- Established active microrheology using magnetic droplets to measure cytoplasmic mechanics.
- Utilized passive microrheology with fluorescent beads to assess probe mobility.
- Inhibited cytokinesis to differentiate mechanical changes from geometric alterations.
Main Results:
- Active microrheology showed a progressive decrease in creep compliance from the 1-cell to 8-cell stage, indicating cytoplasmic stiffening.
- This stiffening persisted even when cytokinesis was inhibited.
- Passive microrheology revealed a consistent decrease in probe mobility over development.
Conclusions:
- Cytoplasmic mechanical properties undergo a gradual, developmentally programmed change during embryogenesis.
- These changes are not solely attributable to geometric alterations from cell division.
- The cellular mechanical environment dynamically evolves during early development.
