Experimental Hybridization among Oryzias Species. II. Karyogamy and Abnormality of Chromosome Separation in the Cleavage of Interspecific Hybrids between Oryzias latipes and O. javanicus
スポンサーリンク
概要
- 論文の詳細を見る
In interspecific hybridization between Oryzias latipes and O. javanicus, all hybrid embryos failed to develop and died before hatching. Cytological examination of fertilization and early development was performed to discover the cause of lethal development. When O. latipes eggs were inseminated by sperm of O. javanicus, the cortical reaction was induced normally. Chromosomal material in the fertilized eggs was visualized using the DNA-specific fluorochrome Hoechst. The spermatozoon was capable of penetrating into the egg cytoplasm through the micropyle, and the sperm nucleus transformed to the male pronucleus. The female pronucleus that formed after extrusion of the second polar body migrated towards the male pronucleus. The female and the male pronuclei underwent DNA synthesis and encountered each other in the center of the blastodisc, fused with one another and formed a zygote nucleus before breakdown of the nuclear envelope. Metaphase chromosomes with electron dense chromatin regions were abnormally divided into each blastomere in cleavage. The abnormally separating chromatin masses were also labeled by BrdU. The abnormal separation resulting in partial loss of fragmented chromatin might be a cause of abortive development in the interspecific hybrids between O. latipes and O. javanicus.
- 社団法人日本動物学会の論文
- 2003-11-25
著者
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Yamashita Masakane
Division of Biological Sciences, Graduate School of Science, Hokkaido University
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Iwamatsu Takashi
Department of Biology, Aichi University of Education
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SHIBATA Yasushi
Laboratory of Reproductive Biology, National Institute for Basic Biology
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Shibata Yasushi
Laboratory Of Reproductive Biology National Institute For Basic Biology
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YUSA Akiko
Department of Molecular Pathology, Research Institute, Aichi Cancer Center
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Iwamatsu Takashi
Department Of Biology Aichi University Of Education
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Yamashita Masakane
Department Of Molecular And Cellular Interactions Division Of Biological Science Graduate School Of
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Yamashita Masakane
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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Yusa Akiko
Department Of Biology Aichi University Of Education
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KOBAYASHI Hirokuni
Department of Biology, Asahi University School of Dentistry
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Kobayashi Hirokuni
Department Of Biology Asahi University School Of Dentistry
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