Morphology of Filaments on the Chorion of Oocytes and Eggs in the Medaka(Developmental Biology)
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The morphology of filaments on the chorion of oocytes and eggs of the medaka, Oryzias latipes, was investigated as a step in the clarification of the mechanism for the determination of egg polarity. In mature oocytes, long attaching filaments arising from the vegetal pole area (VPA) of the egg membrane (chorion) were wound spirally on the axis between the animal and the vegetal poles of the egg, and covered the chorionic surface in the vegetal hemisphere. Short non-attaching filaments which were distributed on the chorionic surface in the area other than the VPA were also bent in a unilateral direction on the egg axis. In the previtellogenic stage of oogenesis, both attaching and non-attaching filaments appeared as verruciform structures on the oocyte surface before appearance of the chorion. The VPA at the one end of the animal-vegetal axis was first recognizable morphologically by the appearance of a cluster of verruciform structures which were destined to develop into attaching filaments. As these primitive filaments grew to form horn-shaped structures, their distal parts bent and pointed either to the right or the left around the axis. Six inbreedings of fish selected for right-handed filament pattern failed to demonstrate a hereditory determination of the pattern. In addition, it was ascertained that eggs of several other species of Oryzias also possessed both attaching and non-attaching filaments on the chorionic surface which showed an unilateral spiral pattern on the animal-vegetal axis. The results of this study suggest that in the medaka, egg polarity is established by localization of the VPA, followed by the unilateral bending of non-attaching filaments on the chorion.
- 社団法人日本動物学会の論文
- 1992-06-15
著者
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