Abstract
The expression profiles of several mRNAs were characterized during follicular maturational competence (FMC) acquisition. Post-vitellogenic female rainbow trout (Oncorhynchus mykiss) were assayed in vitro for follicular maturational competence (FMC). Ovarian follicles were stimulated in vitro for 60 h at 12 °C with a range of concentrations of partially purified gonadotropin and the efficient concentration for 50% germinal vesicle breakdown was calculated and used as an indicator of follicular maturational competence. Before in vitro assay, ovarian tissue was sampled in order to quantify mRNA abundance in the ovarian follicle by real-time PCR. The mRNA expression of Luteinizing Hormone receptor (LH-r), Follicular Stimulating Hormone receptor (FSH-r), Insulin-like Growth Factor 1 (IGF1), Insulin-like Growth Factor 2 (IGF2), Insulin-like Growth Factor receptor 1a (IGF-r1a) and 20β-hydroxysteroid dehydrogenase (20β-HSD), that are putatively expressed in the preovulatory ovary, was thus studied in females of varying FMC.
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