| Isolation and characterization of three estrogen receptor transcripts in Oreochromis mossambicus (Peters). | |
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MedLine Citation:
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PMID: 20025969 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Exposure of aquatic organisms to 17beta-estradiol (E(2)) induces a variety of estrogen-responsive genes, including vitellogenin (vtg)-the precursor protein of egg yolk in oviparous animals and to date the single most used gene product in screening for estrogenic endocrine disruption. Transcription regulation of vtg by E(2) is dependent on binding of the ligand (E(2)) to a specific nuclear receptor (estrogen receptor, ESR) which in turn binds to an estrogen responsive element (ERE) in the promoter of vtg. Since a local tilapiine, Oreochromis mossambicus (Peters), is targeted as a model for estrogenic endocrine disruption in Southern Africa, a platform of knowledge is necessary for the ontogenic and tissue specific behavior of ESR in this species before vtg levels can be interpreted in relation to such endocrine disruption. Therefore, three ESR cDNA sequences (ESR1, ESR2a and ESR2b) in O. mossambicus were isolated and QPCR protocols were developed to ascertain their quantitative transcript levels in adult brain, gonadal and hepatic tissues. ESR1 transcript levels were highest in female liver tissue compared to males and other tissues, whereas the levels for ESR2a and b were not statistically significantly different between male and female tissues. Quantitative gene levels during development demonstrated a sharp increase in ESR1 during the stage of gonad differentiation (50-60 days post-fertilization) in this species. Finally, an induction experiment in adult male liver tissue confirms the upregulation of ESR1 by E(2). |
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Authors:
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M M Esterhuyse; C C Helbing; J H van Wyk |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-12-16 |
Journal Detail:
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Title: The Journal of steroid biochemistry and molecular biology Volume: 119 ISSN: 1879-1220 ISO Abbreviation: J. Steroid Biochem. Mol. Biol. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-02-24 Completed Date: 2010-03-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9015483 Medline TA: J Steroid Biochem Mol Biol Country: England |
Other Details:
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Languages: eng Pagination: 26-34 Citation Subset: IM |
Copyright Information:
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Copyright 2010 Elsevier Ltd. All rights reserved. |
Affiliation:
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Ecophysiology Laboratory, Department of Botany and Zoology, University of Stellenbosch, Stellenbosch, South Africa. mme2@sun.ac.za |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Amino Acid Sequence Animals Cloning, Molecular Female Gene Expression Regulation, Developmental Male Molecular Sequence Data Nucleic Acid Amplification Techniques Organ Specificity / genetics Phylogeny Protein Isoforms / genetics, isolation & purification, metabolism RNA, Messenger / analysis, isolation & purification*, metabolism Receptors, Estrogen / genetics*, isolation & purification, metabolism Sequence Homology, Amino Acid Tilapia / genetics*, growth & development, metabolism Tissue Distribution Vitellogenins / genetics, metabolism |
| Chemical | |
Reg. No./Substance:
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0/Protein Isoforms; 0/RNA, Messenger; 0/Receptors, Estrogen; 0/Vitellogenins |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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