Sperm-Egg Interaction Mechanisms in Mammalian Fertilization
Summary
The process of mammalian fertilization entails a finely orchestrated sequence of events whereby a capacitated spermatozoon navigates the female reproductive tract, binds to and penetrates the egg’s protective coats, and ultimately fuses with the oocyte membrane. Following capacitation in the oviduct, sperm undergo biochemical and biophysical modifications that expose key adhesion molecules on the plasma membrane. Initial recognition involves carbohydrate–protein interactions with the zona pellucida (ZP), a glycoprotein-rich extracellular matrix surrounding the oocyte. Binding triggers the acrosome reaction, an exocytotic event that releases hydrolytic enzymes such as acrosin and matrix metalloproteinases, facilitating local digestion of the ZP. Penetration of the ZP permits access to the perivitelline space and brings sperm into proximity with the oolemma, where species-specific recognition is mediated by complementary receptor–ligand pairs. Engagement of the sperm-specific protein Izumo1 with the oocyte receptor Juno precipitates membrane apposition and fusion, culminating in the formation of the zygote. These interactions are subject to stringent regulation, ensuring monospermy and genomic integrity. A deeper molecular understanding of these steps has direct implications for addressing infertility, improving assisted reproductive technologies and developing non-hormonal contraceptives.
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Sperm-Egg Interaction Mechanisms in Mammalian Fertilization publication trend
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Technical terms
Capacitation: A series of physiological changes in sperm that enhance motility and prepare membrane proteins for zona pellucida binding.
Zona pellucida (ZP): The glycoprotein coat surrounding the oocyte that mediates species-specific sperm binding and induces the acrosome reaction.
Acrosome reaction: Exocytosis of the acrosomal vesicle in sperm, releasing hydrolytic enzymes to facilitate zona pellucida penetration.
Glycoprotein: A protein covalently linked to carbohydrate chains, often serving as recognition ligands or receptors in cell–cell interactions.
Izumo1–Juno interaction: A receptor–ligand pair on sperm and oocyte membranes, respectively, essential for membrane fusion leading to fertilization.
References
- Ligands and Receptors Involved in the Sperm-Zona Pellucida Interactions in Mammals. Cells (2021).
- Sperm from mice carrying a targeted mutation of the acrosin gene can penetrate the oocyte zona pellucida and effect fertilization.. Journal of Biological Chemistry (1994).
- MMP2 and acrosin are major proteinases associated with the inner acrosomal membrane and may cooperate in sperm penetration of the zona pellucida during fertilization. Cell and Tissue Research (2012).
- Acrosin Accelerates the Dispersal of Sperm Acrosomal Proteins during Acrosome Reaction*. Journal of Biological Chemistry (1998).
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