A Further Note on Testis-Ova in the Teleost, Oryzias latipes
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چکیده
منابع مشابه
Effect of ethinylestradiol on the reproduction and induction of vitellogenin and testis-ova in medaka (Oryzias latipes).
Mature medaka (Oryzias latipes) were exposed to ethinylestradiol (EE2) at measured concentrations of 32.6, 63.9, 116, 261, and 488 ng/L for 21 d under flow-through conditions. Effects on reproductive success of the fish as well as on gonadal condition and vitellogenin (VTG) induction were assessed. A significant decrease in fecundity was observed only at the highest EE2 concentration, whereas h...
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We report the identification and characterization of two distinct GnRH receptor (GnRH-R) subtypes, designated GnRH-R1 and GnRH-R2, in a model teleost, the medaka Oryzias latipes. These seven-transmembrane receptors of the medaka contain a cytoplasmic C-terminal tail, which has been found in all other nonmammalian GnRH-Rs cloned to date. The GnRH-R1 gene is composed of three exons separated by t...
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Electron-microscopic observations on sex differentiation during normal development in the medaka, Oryzias latipes, are presented in this report. Primordial germ cells in embryos 6-10 days after fertilization are clearly distinguishable from somatic cells by the presence in the cytoplasm of the former of germinal dense bodies, closely associated with large aggregations of mitochondria. The gonad...
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Although sex determination systems in animals are diverse, sex-determining genes have been identified only in mammals and some invertebrates. Recently, DMY (DM domain gene on the Y chromosome) has been found in the sex-determining region on the Y chromosome of the teleost medaka fish, Oryzias latipes. Functional and expression analyses of DMY show it to be the leading candidate for the male-det...
متن کاملSex differentiation of germ cells in the teleost, Oryzias latipes, during noraml embryonic development.
Mitotic and meiotic activities of germ cells during early development in the medaka, Oryzias latipes, are dealt with in this report. Primordial germ cells were obviously distinguishable from somatic cells 3 days after fertilization and began to proliferate about 7 days after fertilization. The mean number of primordial germ cells increased during a period of 7-10 days after fertilization, reach...
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ژورنال
عنوان ژورنال: Proceedings of the Japan Academy
سال: 1964
ISSN: 0021-4280
DOI: 10.2183/pjab1945.40.753