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The pejerrey possesses a genotypic sex determination system driven by the gene and yet shows marked temperature-dependent sex determination. Sex-reversed XY females have been found in a naturally breeding population established in Lake Kasumigaura, Japan. These females could mate with normal XY males and generate YY "supermale" individuals that, if viable and fertile, would sire only genotypic male offspring.
View Article and Find Full Text PDFSurrogate production of eggs and sperm by intrapapillary transplantation of germ cells in cytoablated adult fish.
PLoS One
January 2015
Graduate School of Marine Science and Technology, Tokyo University of Marine Science and Technology, Minato, Tokyo, Japan.
Germ cell transplantation (GCT) is a promising assisted reproductive technology for the conservation and propagation of endangered and valuable genetic resources. In teleost fish, GCT in adult gonads has been achieved only in male recipients, limiting greatly the usefulness of this technique in situations where both sexes need equal and timely attention for conservation and/or propagation. Here we describe a simplified GCT approach that ultimately leads to production of donor-derived eggs and sperm in considerably short time.
View Article and Find Full Text PDFEnvironmental stress-induced testis differentiation: androgen as a by-product of cortisol inactivation.
Gen Comp Endocrinol
October 2013
Laboratorio de Biología del Desarrollo, Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús (CONICET-UNSAM), Chascomús, Argentina. Electronic address:
This review deals with the gonadal masculinization induced by thermal stress in fish with focus on the action of 11β-hydroxysteroid dehydrogenase (11β-HSD) as this mechanism key transducer. High temperatures have been reported to produce male-skewed sex ratios in several species with TSD (temperature-dependent sex determination), and in some of them, this process was reported to be associated with high levels of cortisol, the hormone-related stress in vertebrates, during early gonad development. In addition, in pejerrey larvae reared at high-masculinizing temperatures, 11-ketotestosterone (11-KT), the main and most potent androgen in fish, was also detected at high levels.
View Article and Find Full Text PDFThe cortisol and androgen pathways cross talk in high temperature-induced masculinization: the 11β-hydroxysteroid dehydrogenase as a key enzyme.
Endocrinology
December 2012
Instituto de Investigaciones Biotecnológicas, Instituto Tecnológico de Chascomús, Chascomús, B7130IWA Argentina.
In many ectotherm species the gonadal fate is modulated by temperature early in life [temperature-dependent sex determination (TSD)] but the transducer mechanism between temperature and gonadal differentiation is still elusive. We have recently shown that cortisol, the glucocorticoid stress-related hormone in vertebrates, is involved in the TSD process of pejerrey, Odontesthes bonariensis. Particularly, all larvae exposed to a male-producing temperature (MPT, 29 C) after hatching showed increased whole-body cortisol and 11-ketotestosterone (11-KT; the main bioactive androgen in fish) levels and developed as males.
View Article and Find Full Text PDFPresence of 11-ketotestosterone in pre-differentiated male gonads of Odontesthes bonariensis.
Fish Physiol Biochem
February 2013
Laboratorio de Ictiofisiología y Acuicultura, IIB-INTECH (CONICET-UNSAM), Chascomús, Argentina.
The involvement of androgens during sex differentiation period was investigated in the pejerrey Odontesthes bonariensis, by classic biochemical studies and gonadal histology. We studied in particular whether the enzyme activities involved in 11-oxygenated androgen production were active in a gonadal/peritoneum complex (GPC) of very small larvae exposed to masculinizing temperatures previous to morphological sex differentiation (5 weeks post-hatching). The GPC was incubated with 17-hydroxyprogesterone ((3)H-17P), and the presence of 11-KT as major metabolite in early gonads undergoing masculine pathway after temperature treatment exposure is reported.
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