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Sexual Dimorphic Expression of Genes in Gonads During Early Differentiation of a Teleost Fish, the Nile Tilapia Oreochromis niloticus1
It is concluded that the sex-specific expression of foxl2 and cyp19a1a in XX gonads and dmrt1 in XY gonads during early gonadal differentiation is critical for undifferentiated gonads to differentiate into either the ovary or testis in the Nile tilapia. Expand
Morphology, endocrinology, and environmental modulation of gonadal sex differentiation in teleost fishes
A detailed account of the early histological process of gonadal sex differentiation, with special reference to gonochoristic species, is provided, and the criteria employed to positively identify ovarian and testicular differentiation is reviewed. Expand
Histological and ultrastructural evidence for the role of gonadal steroid hormones in sex change in the protogynous wrasse Thalassoma duperrey
The process of sex change from ovary to testis was divided into six stages on the basis of changes in the structure of the germinal and somatic elements, and sex change to male was considered complete with the beginning of active spermatogenesis and spermiation. Expand
Gonadal Restructuring and Correlative Steroid Hormone Profiles during Natural Sex Change in Protogynous Honeycomb Grouper (Epinephelus merra)
The present results suggest that low serum E2 levels and degeneration of oocytes accompanied by concomitant increase in the 11-KT levels and proliferation of spermatogenic germ cells are probably the events mediating protogynous sex change in the honeycomb grouper. Expand
Sexually Dimorphic Expression of Gonadotropin Subunits in the Pituitary of Protogynous Honeycomb Grouper (Epinephelus merra): Evidence That Follicle-Stimulating Hormone (FSH) Induces Gonadal Sex
The results suggest that FSH may trigger the female-to-male sex change in honeycomb grouper. Expand
Molecular cloning and quantitative expression of sexually dimorphic markers Dmrt1 and Foxl2 during female-to-male sex change in Epinephelus merra.
Real-time quantitative RT-PCR analyses showed that Foxl2 mRNA expression was significantly downregulated from the late transitional phase to the completion of sex change, whereas Dmrt1 expression increased with the progression of spermatogenesis and continued until the formation of the testis. Expand
Sex Inversion of Sexually Immature Honeycomb Grouper (Epinephelus merra) by Aromatase Inhibitor
Results suggest that estrogen plays an important role in sex change of protogynous honeycomb grouper, and that treatments with AI potentially inhibits endogenous E2 production in vivo, causing oocyte degeneration and subsequently the sex inversion from female to male. Expand
Aromatase inhibitor induces complete sex change in the protogynous honeycomb grouper (Epinephelus merra)
The protogynous hermaphrodite fish change sex from female to male at the certain stages of life cycle. The endocrine mechanisms involved in gonadal restructuring throughout protogynous sex change areExpand
Role of steriod hormones in sex change of protogynous wrasse
The endocrine mechanisms of sequential hermaphroditism were investigated in protogynous wrasse and suggest that removal of estrogen is a key step to initiate sex change. Expand