Anchoring cortical granules in the cortex ensures trafficking to the plasma membrane for post-fertilization exocytosis

Abstract

Mammalian eggs require a single sperm for viable fertilization, and cortical granule exocytosis prevents additional sperm binding. Vogt et al. image at single granule resolution to document that cortical granule anchoring in the cortex ensures proper trafficking, exocytosis and polyspermy block.