Sperm-egg interaction in the painted frog (Discoglossus pictus): an ultrastructural study

Molecular Reproduction and Development
C CampanellaU Atripaldi

Abstract

The ultrastructure of sperm changes and penetration in the egg was studied in the anuran Discoglossus pictus, whose sperm have an acrosome cap with a typical tip, the apical rod. The first stage of the sperm apical rod and acrosome reaction (AR) consists in vesiculation between the plasma membrane and the outer acrosome membrane. The two components of the acrosome cap are released in sequence. The innermost component (component B) is dispersed first. The next acrosome change is the dispersal of the outermost acrosome content (component A). At 30 sec postinsemination, when the loss of component B is first observed, holes are seen in the innermost jelly coat (J1), surrounding the penetrating sperm. Therefore, this acrosome constituent might be related to penetration through the innermost egg investments. At 1 min postinsemination, during sperm penetration into the egg, a halo of finely granular material is observed around the inner acrosome membrane of the spermatozoon, suggesting a role for component A at this stage of penetration. Gamete-binding and fusion take place between D1 (the egg-specific site for sperm interaction) and the perpendicularly oriented sperm. Spermatozoa visualized at their initial interaction (15 sec postin...Continue Reading

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Citations

Jun 17, 2008·Development, Growth & Differentiation·Noritaka HirohashiMotonori Hoshi
May 28, 2009·Development, Growth & Differentiation·Keita NagaiYasuhiro Iwao
Jan 10, 2003·Zoological Science·Akihiko Watanabe, Kazuo Onitake
Oct 22, 2008·Molecular Reproduction and Development·Akihiko WatanabeKazuo Onitake
Apr 20, 2004·Molecular Reproduction and Development·Vincenzo InfanteChiara Campanella
Jun 23, 2010·Molecular Reproduction and Development·Hideo KuboYasuhiro Iwao
Oct 28, 2006·Journal of Experimental Zoology. Part A, Comparative Experimental Biology·Shigekazu TakahashiKazuo Onitake
Mar 17, 2007·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Wataru HiyoshiKazuo Onitake
Jun 20, 2019·Molecular Reproduction and Development·Daisuke EndoAkihiko Watanabe
Sep 13, 2011·Micron : the International Research and Review Journal for Microscopy·Marcela Fátima MedinaSilvia Nélida Fernández

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