Authors
Vos BE, Vadapalli Y, Muenker TM, Astad Jentoft IM, Todisco E, Eskandari MA, Schuh M, Lenart P, Betz T
Journal
Biophysical Journal
Citation
Biophys J. 2025 Aug 18:S0006-3495(25)00524-7.
Abstract
The mechanical properties of the cytoplasm and nucleoplasm are crucial for the correct and robust functioning of a cell and play a key role in understanding how mechanical signals are transferred to the nucleus. Here, we demonstrate remarkable shape mimicry between the cellular and nuclear shape of oocytes, following the externally applied deformation without direct contact between the cell cortex and the nucleus. This effect arises from a surprisingly soft and fluid-like nucleoplasm that barely resists external strain, while the viscoelastic cytoplasm drives shape transmission. Comparative studies in jellyfish, starfish, and mouse oocytes reveal that lower cytoplasmic elasticity in jellyfish leads to reduced nuclear shape mimicry, highlighting the role of cytoplasmic mechanics in nuclear deformation.
