An update on post-ejaculatory remodeling of the sperm surface before mammalian fertilization

Theriogenology
Bart M Gadella, A Boerke

Abstract

The fusion of a sperm with an oocyte to form new life is a highly regulated event. The activation-also termed capacitation-of the sperm cell is one of the key preparative steps required for this process. Ejaculated sperm has to make a journey through the female uterus and oviduct before it can approach the oocyte. The oocyte at that moment also has become prepared to facilitate monospermic fertilization and block immediately thereafter the chance for polyspermic fertilization. Interestingly, ejaculated sperm is not properly capacitated and consequently is not yet able to fertilize the oocyte. During the capacitation process, the formation of competent lipid-protein domains on the sperm head enables sperm-cumulus and zona pellucida interactions. This sperm binding allows the onset for a cascade reaction ultimately resulting in oocyte-sperm fusion. Many different lipids and proteins from the sperm surface are involved in this process. Sperm surface processing already starts when sperm are liberated from the seminiferous tubules and is followed by epididymal maturation where the sperm cell surface is modified and loaded with proteins to ensure it is prepared for its fertilization task. Although cauda epididymal sperm can fertilize...Continue Reading

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Apr 30, 2017·Molecular Reproduction and Development·Bart M Gadella
Oct 27, 2017·Reproduction, Fertility, and Development·Taylor PiniSimon Paul de Graaf
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Apr 4, 2021·Animals : an Open Access Journal From MDPI·Estíbaliz LacalleFelipe Martínez-Pastor

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