Elvira Nikalayevich, Gaëlle Letort, Ghislain de Labbey, Elena Todisco, Anastasia Shihabi, Hervé Turlier, Raphaël Voituriez, Mohamed Yahiatene, Xavier Pollet-Villard, Metello Innocenti, Melina Schuh, Marie-Emilie Terret, Marie-Hélène Verlhac
The cortex controls cell shape. In mouse oocytes, the cortex thickens in an Arp2/3-complex-dependent manner, ensuring chromosome positioning and segregation. Surprisingly, we identify that mouse oocytes lacking the Arp2/3 complex undergo cortical actin remodeling upon division, followed by cortical contractions that are unprecedented in mammalian oocytes. Using genetics, imaging, and machine learning, we show that these contractions stir the cytoplasm, resulting in impaired organelle organization and activity...
February 20, 2024: Developmental Cell