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Experimental Hybridization among Oryzias Species. II. Karyogamy and Abnormality of Chromosome Separation in the Cleavage of Interspecific Hybrids between Oryzias latipes and O. javanicus

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Title: Experimental Hybridization among Oryzias Species. II. Karyogamy and Abnormality of Chromosome Separation in the Cleavage of Interspecific Hybrids between Oryzias latipes and O. javanicus
Authors: Iwamatsu, Takashi Browse this author
Kobayashi, Hirokuni Browse this author
Yamashita, Masakane Browse this author
Shibata, Yasushi Browse this author
Yusa, Akiko Browse this author
Keywords: Oryzias
interspecific hybridization
karyogamy
chromosome separation
Issue Date: Nov-2003
Publisher: 日本動物学会
Journal Title: Zoological Science
Volume: 20
Issue: 11
Start Page: 1381
End Page: 1387
Abstract: 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.
Rights: (c) 日本動物学会 / 本文献の公開は著者の意思に基づくものである
Relation: http://www.bioone.org/perlserv/?request=get-archive&issn=0289-0003
Type: article
URI: http://hdl.handle.net/2115/32966
Appears in Collections:生命科学院・先端生命科学研究院 (Graduate School of Life Science / Faculty of Advanced Life Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山下 正兼

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