Acrosome reaction is subfamily specific in sea star fertilization

Acrosome reaction is subfamily specific in sea star fertilization.

In the fertilization process of sea stars, sperm is activated to go through the acrosome reaction before cell fusion. We focused on induction of the acrosome reaction as a key process in fertilization. Six species of sea stars were used in this study: Asterias amurensis, Asterias rubens, Asterias forbesi, Aphelasterias japonica, Distolasterias nipon, and Asterina pectinifera. Acrosome reaction ...

The Fertilization Reaction in the Sea-urchin

The Acrosome Reaction In

Suspensions of Mytilus edulis eggs were fixed with osmium tetroxide at various intervals between 1 and l0 seconds after heavy insemination, and sectioned for electron microscopy to follow the natural process of acrosome reaction in the spermatozoa around the eggs. Sperm suspensions were also fixed after the addition of I0 per cent by volume of M/3 calcium chloride. Within the first second after...

Regulating the acrosome reaction.

The acrosome reaction is a secretory event that must be completed by the sperm of many animal species prior to fusion with eggs. In mammals, exocytosis in triggered by ZP3, a glycoprotein component of the egg pellucida, following gamete contact. ZP3 promotes a sustained influx of Ca2+ into sperm that is necessary for the acrosome reaction. Here, we discuss the mechanism by which ZP3 generates C...

Capacitation as a regulatory event that primes spermatozoa for the acrosome reaction and fertilization.

Capacitation is defined as the series of transformations that spermatozoa normally undergo during their migration through the female genital tract, in order to reach and bind to the zona pellucida, undergo the acrosome reaction, and fertilize the egg. During this process, extensive changes occur in all sperm compartments (head and flagellum; membrane, cytosol, cytoskeleton), factors originating...