Reference - Detail
|Author||Hamaguchi S, Toyazaki Y, Shinomiya A, Sakaizumi M.|
|Title||The XX-XY sex-determination system in Oryzias luzonensis and O. mekongensis revealed by the sex ratio of the progeny of sex-reversed fish.|
The sex-determining gene in Oryzias latipes and O. curvinotus has been proved to be DMY. Although O. curvinotus has the DMY gene on the Y chromosome which is homologous to the Y chromosome of O. latipes, the sex-determining mechanism of other Oryzias fishes has not been identified. In order to uncover the sex-determining mechanism of O. luzonensis and O. mekongensis, which are most closely related species to O. latipes and O. curvinotus, we analyzed the sex ratio of the progeny of sex-reversed fish. We were able to obtain sex-reversed males by the administration of methyltestosterone, and found that these yielded all-female offspring in both species. These results indicate that O. luzonensis and O. mekongensis have the XX-XY sex-determination system.
|MeSH||Animals Estradiol / pharmacology Gonads / anatomy & histology Gonads / drug effects Hermaphroditic Organisms* Histological Techniques Methyltestosterone / pharmacology Oryzias / physiology* Phylogeny Sex Chromosomes / physiology* Sex Determination Processes* Sex Ratio*|
|Medaka||O. luzonensis (RS270) O. mekongensis|