- About
-
The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
Search results
Showing 1 to 4 of 4 (0.102 seconds)Spelling suggestions: "subject:"geschlechtsdetermination"" "subject:"geschlechtsdeterminierung""
| 1 |
Elevated amh Gene Expression in the Brain of Male Tilapia (Oreochromis niloticus) during Testis DifferentiationPoonlaphdecha, S., Pepey, E., Huang, S.-H., Canonne, M., Soler, Lucile, Mortaji, S., Morand, Serge, Pfennig, Frank, Mélard, Charles, Baroiller, J.F., D’Cotta, Helena 17 March 2014 (has links) (PDF)
Anti-müllerian hormone (AMH) is expressed in male embryos and represses development of müllerian ducts during testis differentiation in mammals, birds and reptiles. Amh orthologues have been identified in teleosts despite them lacking müllerian ducts. Previously we found sexually dimorphic aromatase activity in tilapia brains before ovarian differentiation. This prompted us to search for further dimorphisms in tilapia brains during sex differentiation and see whether amh is expressed. We cloned the tilapia amh gene and found that it contains 7 exons but no spliced forms. The putative protein presents highest homologies with Amh proteins of pejerrey and medaka as compared to other Perciformes. We analysed amh expression in adult tissues and found elevated levels in testes, ovary and brain. Amh expression was dimorphic with higher levels in XY male brains at 10–15 dpf, when the gonads were still undifferentiated and gonadal amh was not dimorphic. Male brains had 2.7-fold higher amh expression than gonads. Thereafter, amh levels decreased in the brain while they were up-regulated in differentiating testes. Our study indicates that amh is transcribed in male brains already at 10 dpf, suggesting that sexual differentiation may be occurring earlier in tilapia brain than in gonads. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
|
| 2 |
Elevated amh Gene Expression in the Brain of Male Tilapia (Oreochromis niloticus) during Testis DifferentiationPoonlaphdecha, S., Pepey, E., Huang, S.-H., Canonne, M., Soler, Lucile, Mortaji, S., Morand, Serge, Pfennig, Frank, Mélard, Charles, Baroiller, J.F., D’Cotta, Helena January 2011 (has links)
Anti-müllerian hormone (AMH) is expressed in male embryos and represses development of müllerian ducts during testis differentiation in mammals, birds and reptiles. Amh orthologues have been identified in teleosts despite them lacking müllerian ducts. Previously we found sexually dimorphic aromatase activity in tilapia brains before ovarian differentiation. This prompted us to search for further dimorphisms in tilapia brains during sex differentiation and see whether amh is expressed. We cloned the tilapia amh gene and found that it contains 7 exons but no spliced forms. The putative protein presents highest homologies with Amh proteins of pejerrey and medaka as compared to other Perciformes. We analysed amh expression in adult tissues and found elevated levels in testes, ovary and brain. Amh expression was dimorphic with higher levels in XY male brains at 10–15 dpf, when the gonads were still undifferentiated and gonadal amh was not dimorphic. Male brains had 2.7-fold higher amh expression than gonads. Thereafter, amh levels decreased in the brain while they were up-regulated in differentiating testes. Our study indicates that amh is transcribed in male brains already at 10 dpf, suggesting that sexual differentiation may be occurring earlier in tilapia brain than in gonads. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
|
| 3 |
Selektionsexperimente zur Erhöhung des Männchenanteils bei Nilbuntbarschen (Oreochromis niloticus) mittels Temperaturbehandlung / Selection experiments to increase the male proportion in Nile Tilapia (Oreochromis niloticus) by means of temperature treatmentWessels, Stephan 14 July 2006 (has links)
No description available.
|
| 4 |
Quantitative and molecular genetic studies on temperature-dependent sex determination of Nile tilapia (<i>Oreochromis niloticus</i>) / Quantitativ- und molekulargenetische Studien zur temperaturabhängigen Geschlechtsdetermination von Niltilapien (<i>Oreochromis niloticus</i>)Lühmann, Liane-Magdalena 02 February 2012 (has links)
No description available.
|
Page generated in 0.1243 seconds