Sperm-Egg Interaction during Fertilization in Birds

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  • Ichikawa Yoshinobu
    Faculty of Agriculture, Shizuoka University, Japan
  • Matsuzaki Mei
    Faculty of Agriculture, Shizuoka University, Japan United Graduate School of Agricultural Science, Gifu University, Japan
  • Hiyama Gen
    Medical-Industrial Translational Research Center, Fukushima Medical University, Japann
  • Mizushima Shusei
    Graduate School of Science and Engineering for Research, University of Toyama, Japan
  • Sasanami Tomohiro
    Faculty of Agriculture, Shizuoka University, Japan United Graduate School of Agricultural Science, Gifu University, Japan

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Fertilization in animals that employ sexual reproduction is an indispensable event for the production of the next generation. A significant advancement in our understanding of the molecular mechanisms of sperm-egg interaction in mammalian species was achieved in the last few decades. However, the same level of knowledge has not been accumulated for birds because of egg size and the difficulty in mimicking the physiological polyspermy that takes place during normal fertilization. In this review, we summarize the current understanding of sperm-egg interaction mechanism during fertilization in birds, especially focusing on sperm-egg binding, sperm acrosome reaction and the authentic sperm protease required for the hole formation on the perivitelline membrane. We explain that the zona pellucida proteins (ZP1 and ZP3) in the perivitelline membrane play important roles in sperm-egg binding, induction of the acrosome reaction as well as sperm penetration by digestion of sperm protease. We anticipate that a deeper understanding of avian fertilization will open up new avenues to create powerful tools for a myriad of applications in the poultry industries including the production of transgenic and cloned birds.

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