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Article: Effect of in vitro culture of mammalian embryos on the architecture of the zona pellucida.
- Article from:
- The Biological Bulletin
- Article date:
- October 1, 1997
- Author:
CopyrightCOPYRIGHT 1997 Marine Biological Laboratory. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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The mammalian zona pellucida (zona) is composed of glycoprotein filaments organized in three layers that differ in their orientation and birefringence (1). Relative to the embryo, filaments of the inner zona are oriented radially, whereas filaments of the outer zona are oriented tangentially. The inner and outer layers are separated by a layer of minimal birefringence, suggesting random orientation of filaments in the mid-zona. Before implantation, the blastocyst must hatch from the zona. In vitro culture of embryos reduces their rate of implantation, which limits the effectiveness of in vitro fertilization for treatment of infertility in humans. We hypothesized that in ...
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... ... progressively increased during culture, and the maximum size (72.0 [+ or -] 2.4 [micro]m) was reached on day 10 of the in vitro culture. The chromatin configuration in the germinal vesicle (GV) oocyte progressively shifted from a non-surrounded nucleolus ...
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