Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels
Tesis por compendio European eel (Anguilla anguilla, L., 1758) is suffering a strong population decrease and at the same time it is a very appreciated species and by now it has not been possible closing its cycle life. In fact, this species does not mature in captivity unless hormonally induced. So...
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Universitat Politècnica de València
2015
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Online Access: | http://hdl.handle.net/10251/48490 https://doi.org/10.4995/Thesis/10251/48490 |
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ftunivpvalencia:oai:riunet.upv.es:10251/48490 2023-05-15T13:28:18+02:00 Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels Mazzeo, Ilaria Asturiano Nemesio, Juan Francisco Sánchez Peñaranda, David Universitat Politècnica de València. Departamento de Ciencia Animal - Departament de Ciència Animal 2015-12-19 http://hdl.handle.net/10251/48490 https://doi.org/10.4995/Thesis/10251/48490 eng eng Universitat Politècnica de València http://hdl.handle.net/10251/48490 doi:10.4995/Thesis/10251/48490 http://rightsstatements.org/vocab/InC/1.0/ info:eu-repo/semantics/openAccess European eel Reproductive physiology: GnRH receptors Androgen receptors Aromatase Zona Pellucida Gene characterization QPCR Steroids Vitellogenesis Temperature effect BIOLOGIA ANIMAL PRODUCCION ANIMAL info:eu-repo/semantics/doctoralThesis info:eu-repo/semantics/acceptedVersion 2015 ftunivpvalencia https://doi.org/10.4995/Thesis/10251/48490 2022-06-12T20:35:20Z Tesis por compendio European eel (Anguilla anguilla, L., 1758) is suffering a strong population decrease and at the same time it is a very appreciated species and by now it has not been possible closing its cycle life. In fact, this species does not mature in captivity unless hormonally induced. So all the production is up to the natural population. All these factors together make urgent achieving the closing of the productive cycle and for this aim it is important to understand the reproductive physiology and the reasons of this development blockage. The present thesis wants to be a new contribution to the knowledge of reproductive physiology in female European eel submitted at hormonal treatment. To achieve this goal, expression of genes not previously studied in this species (cyp19a1, ara, arb, gnrhr1a, gnrhr1b, gnrhr2, zpb and zpc) was analyzed in eels reared under a constant thermal regime, accordingly to the usual rearing conditions. Also, the effect of rearing temperature on gene expression and steroid profile (T, 11-KT and E2) was studied. In fact, eels migrate to Sargasso Sea to reproduce and during the travel experiment temperature changes, while traditionally they are reared at a constant high temperature which could affect vitellogenesis progression and final oocyte quality. For the study it was necessary cloning and characterizing some genes which have not still been sequenced in European eel. Gene expression was studied by qPCR after designing primer and optimizing the qPCR race. Steroid profiles were analyzed by immunoassays and the gonadal development stages were established by histology. The first result obtained at the end of the study were six new genes characterized in European eel. The analysis of gene expression allowed to understand the involvement of specific genes during vitellogenesis (arb, gnrhr1b and gnrhr2) in different brain regions. The temperature was conformed as a crucial environmental factor affecting vitellogenesis. On one hand, eels matured at lower starting temperatures ... Doctoral or Postdoctoral Thesis Anguilla anguilla European eel Politechnical University of Valencia: RiuNet |
institution |
Open Polar |
collection |
Politechnical University of Valencia: RiuNet |
op_collection_id |
ftunivpvalencia |
language |
English |
topic |
European eel Reproductive physiology: GnRH receptors Androgen receptors Aromatase Zona Pellucida Gene characterization QPCR Steroids Vitellogenesis Temperature effect BIOLOGIA ANIMAL PRODUCCION ANIMAL |
spellingShingle |
European eel Reproductive physiology: GnRH receptors Androgen receptors Aromatase Zona Pellucida Gene characterization QPCR Steroids Vitellogenesis Temperature effect BIOLOGIA ANIMAL PRODUCCION ANIMAL Mazzeo, Ilaria Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels |
topic_facet |
European eel Reproductive physiology: GnRH receptors Androgen receptors Aromatase Zona Pellucida Gene characterization QPCR Steroids Vitellogenesis Temperature effect BIOLOGIA ANIMAL PRODUCCION ANIMAL |
description |
Tesis por compendio European eel (Anguilla anguilla, L., 1758) is suffering a strong population decrease and at the same time it is a very appreciated species and by now it has not been possible closing its cycle life. In fact, this species does not mature in captivity unless hormonally induced. So all the production is up to the natural population. All these factors together make urgent achieving the closing of the productive cycle and for this aim it is important to understand the reproductive physiology and the reasons of this development blockage. The present thesis wants to be a new contribution to the knowledge of reproductive physiology in female European eel submitted at hormonal treatment. To achieve this goal, expression of genes not previously studied in this species (cyp19a1, ara, arb, gnrhr1a, gnrhr1b, gnrhr2, zpb and zpc) was analyzed in eels reared under a constant thermal regime, accordingly to the usual rearing conditions. Also, the effect of rearing temperature on gene expression and steroid profile (T, 11-KT and E2) was studied. In fact, eels migrate to Sargasso Sea to reproduce and during the travel experiment temperature changes, while traditionally they are reared at a constant high temperature which could affect vitellogenesis progression and final oocyte quality. For the study it was necessary cloning and characterizing some genes which have not still been sequenced in European eel. Gene expression was studied by qPCR after designing primer and optimizing the qPCR race. Steroid profiles were analyzed by immunoassays and the gonadal development stages were established by histology. The first result obtained at the end of the study were six new genes characterized in European eel. The analysis of gene expression allowed to understand the involvement of specific genes during vitellogenesis (arb, gnrhr1b and gnrhr2) in different brain regions. The temperature was conformed as a crucial environmental factor affecting vitellogenesis. On one hand, eels matured at lower starting temperatures ... |
author2 |
Asturiano Nemesio, Juan Francisco Sánchez Peñaranda, David Universitat Politècnica de València. Departamento de Ciencia Animal - Departament de Ciència Animal |
format |
Doctoral or Postdoctoral Thesis |
author |
Mazzeo, Ilaria |
author_facet |
Mazzeo, Ilaria |
author_sort |
Mazzeo, Ilaria |
title |
Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels |
title_short |
Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels |
title_full |
Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels |
title_fullStr |
Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels |
title_full_unstemmed |
Effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female European eels |
title_sort |
effect of thermal regime on the expression of key reproductive genes during hormonally-induced vitellogenesis in female european eels |
publisher |
Universitat Politècnica de València |
publishDate |
2015 |
url |
http://hdl.handle.net/10251/48490 https://doi.org/10.4995/Thesis/10251/48490 |
genre |
Anguilla anguilla European eel |
genre_facet |
Anguilla anguilla European eel |
op_relation |
http://hdl.handle.net/10251/48490 doi:10.4995/Thesis/10251/48490 |
op_rights |
http://rightsstatements.org/vocab/InC/1.0/ info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.4995/Thesis/10251/48490 |
_version_ |
1766403278565801984 |