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- W2586973081 abstract "The animal-vegetal (A-V) axis is already set in unfertilized eggs. It plays crucial roles to coordinate germ-layer formation. However, how the A-V axis is set has not been well studied. In ascidians, unfertilized eggs are already polarized along the axis in terms of cellular components. The polarization occurs during oocyte maturation. Oocytes within the gonad have the germinal vesicle (GV) close to the future animal pole. When the GVs of full-grown oocytes were experimentally translocated to the opposite pole by centrifugal force, every aspect that designates A-V polarity was reversed in the eggs and embryos. This was confirmed by examining the cortical allocation of the meiotic spindle, position of the polar body emission, polarized distribution of mitochondria and postplasmic/PEM mRNA, direction of the cortical flow during oocyte maturation, cleavage pattern, and germ-layer formation during embryogenesis. Therefore, the eccentric position of the GV triggers subsequent polarizing events and establishes the A-V axis in eggs and embryos. We emphasize important roles of the cortical flow. This is the first report in which the A-V axis was experimentally and completely reversed in animal oocytes before fertilization." @default.
- W2586973081 created "2017-02-17" @default.
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- W2586973081 date "2017-01-01" @default.
- W2586973081 modified "2023-10-16" @default.
- W2586973081 title "Eccentric position of the germinal vesicle and cortical flow during oocyte maturation specify the animal-vegetal axis of ascidian embryos" @default.
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- W2586973081 doi "https://doi.org/10.1242/dev.146282" @default.
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