A force balance model for a cell size‐dependent meiotic nuclear oscillation in fission yeast

Author:

Fujita Ikumi1ORCID,Kimura Akatsuki23ORCID,Yamashita Akira45ORCID

Affiliation:

1. Laboratory for Cell Asymmetry, Center for Biosystems Dynamics Research RIKEN Kobe Japan

2. Cell Architecture Laboratory National Institute of Genetics Mishima Japan

3. Department of Genetics, School of Life Science SOKENDAI (The Graduate University for Advanced Studies) Mishima Japan

4. Interdisciplinary Research Unit National Institute for Basic Biology Okazaki Japan

5. Center for Low‐temperature Plasma Sciences Nagoya University Nagoya Japan

Abstract

AbstractFission yeast undergoes premeiotic nuclear oscillation, which is dependent on microtubules and is driven by cytoplasmic dynein. Although the molecular mechanisms have been analyzed, how a robust oscillation is generated despite the dynamic behaviors of microtubules has yet to be elucidated. Here, we show that the oscillation exhibits cell length‐dependent frequency and requires a balance between microtubule and viscous drag forces, as well as proper microtubule dynamics. Comparison of the oscillations observed in living cells with a simulation model based on microtubule dynamic instability reveals that the period of oscillation correlates with cell length. Genetic alterations that reduce cargo size suggest that the nuclear movement depends on viscous drag forces. Deletion of a gene encoding Kinesin‐8 inhibits microtubule catastrophe at the cell cortex and results in perturbation of oscillation, indicating that nuclear movement also depends on microtubule dynamic instability. Our findings link numerical parameters from the simulation model with cellular functions required for generating the oscillation and provide a basis for understanding the physical properties of microtubule‐dependent nuclear movements.

Funder

Japan Society for the Promotion of Science

Publisher

Springer Science and Business Media LLC

Subject

Genetics,Molecular Biology,Biochemistry

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