Production of Diploid Eggs through Premeiotic Endomitosis in the Hybrid Medaka between Oryzias latipes and O. curvinotus
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概要
- 論文の詳細を見る
A hybrid medaka between Oryzias latipes and O. curvinotus spawns diploid eggs. We examined the cytological mechanisms of diploid egg formation in this hybrid. Oocytes in the hybrid passed through the first and second meiotic divisions and excluded two polar bodies, associated with reduction of the DNA content in oocytes. Each germinal vesicle in vitellogenic oocytes of the hybrid had 48 chromosomes with bivalent chiasmata, precisely twice the number of chromosomes in normal oocytes. These results suggest that before meiosis the chromosomes are doubled by mitosis without cytokinesis, that is, endomitosis, and that the resulting tetraploid oogonia undergo normal meiosis to produce diploid eggs. Except for a few vitellogenic oocytes that are probably derived from endomitotic oogonia, most oocytes were arrested at the zygotene stage in the hybrid ovary, suggesting the existence of checkpoint control that ensures the pairing of homologous chromosomes at prophase I, a situation differing from that in the male in which the checkpoint is at metaphase I. A sac-like structure was characteristic of the hybrid ovary. Although this structure was observed only in the hybrid, it may be a native component of the medaka ovary but difficult to observe because of its deformed outer structure due to enlargement of the inside oocytes. The present study confirms that this hybrid medaka provides a useful experimental system for investigations into the mechanisms of oogenesis and basic architecture of the ovary, which are difficult to analyze by using normal medaka.
- 社団法人日本動物学会の論文
- 2000-09-20
著者
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SAKAIZUMI Mitsuru
Department of Environmental Science, Faculty of Science, Niigata University
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Yamashita Masakane
Division of Biological Sciences, Graduate School of Science, Hokkaido University
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SHIBATA NAOKI
Department of Information Processing and Management, Shiga University
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Sakaizumi Mitsuru
Department Of Environmental Science Faculty Of Science Niigata University
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Sakaizumi Mitsuru
Department Of Biology College Of General Education Niigata University
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SHIBATA Norito
RIKEN Center for Developmental Biology
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Yamashita Masakane
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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Shimizu Yohei
Division of Biological Sciences, Graduate School of Science, Hokkaido University
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Shibata N
Advanced Research Center For Genome Super Power Keio University
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Shimizu Yohei
Division Of Biological Sciences Graduate School Of Science Hokkaido University:hokkaido Central Fish
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Shibata Naoki
Department Of Information Processing And Management Shiga University
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Shibata Naoki
Department Of Biology Faculty Of Science Shinshu University
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