Cellular Dynamics of Oocyte Maturation and Fertilization
Summary
The process of oocyte maturation and subsequent fertilization involves a coordinated series of cellular and molecular events that prepare the egg for successful monospermic union and embryogenesis. Oocyte maturation encompasses the resumption of meiosis, marked by germinal vesicle breakdown, cytoplasmic ripening and extensive reorganisation of the cortical actin cytoskeleton. These structural transformations underpin the emergence of specialised microvilli, redistribution of endoplasmic reticulum calcium stores and competence to mount rapid Ca2+ oscillations at sperm entry. Upon fertilization, a well-timed calcium wave triggers cortical granule exocytosis, remodeling of the vitelline layer into a fertilization envelope and the establishment of the block to polyspermy. Lipid signalling molecules such as phosphatidylinositol 4,5-bisphosphate and inositol trisphosphate receptors orchestrate spatial regulation of Ca2+ release, while dynamic actin filaments ensure proper sperm-egg contact, membrane fusion and cortical reaction. Comparative studies across echinoderms and mammals have highlighted both conserved mechanisms and species-specific adaptations, informing assisted-reproduction technologies and offering insight into fundamental controls of cell division and developmental competence.
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Cellular Dynamics of Oocyte Maturation and Fertilization publication trend
The graph below shows the total number of articles in cellular dynamics of oocyte maturation and fertilization across all publications each year (not limited to Nature Index journals).
Technical terms
Oocyte: A female germ cell arrested in meiotic prophase until hormonal cues trigger maturation.
Germinal vesicle breakdown (GVBD): The dissolution of the oocyte nucleus, signalling resumption of meiosis.
Cortical actin cytoskeleton: A subplasmalemmal network of actin filaments that controls cell surface morphology and exocytosis.
Cortical granule exocytosis: The release of vesicles from the egg cortex that transforms the vitelline layer into the fertilization envelope.
Ca2+ oscillations: Repetitive rises and falls in cytosolic calcium concentration that drive egg activation and block polyspermy.
Polyspermy: The entry of multiple sperm into an egg, normally prevented by post-fertilization cortical modifications.
References
- Cellular and molecular aspects of oocyte maturation and fertilization: a perspective from the actin cytoskeleton. Zoological Letters (2020).
- The Effect of Acidic and Alkaline Seawater on the F-Actin-Dependent Ca2+ Signals Following Insemination of Immature Starfish Oocytes and Mature Eggs. Cells (2023).
- Dithiothreitol Affects the Fertilization Response in Immature and Maturing Starfish Oocytes. Biomolecules (2023).
- Regulation of the Actin Cytoskeleton-Linked Ca2+ Signaling by Intracellular pH in Fertilized Eggs of Sea Urchin. Cells (2022).
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