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Differential regulation of two genes implicated in fish reproduction: Vitellogenin and estrogen receptor genes
Author(s) -
Flouriot G.,
Pakdel F.,
Ducouret B.,
Ledrean Y.,
Valotaire Y.
Publication year - 1997
Publication title -
molecular reproduction and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.745
H-Index - 105
eISSN - 1098-2795
pISSN - 1040-452X
DOI - 10.1002/(sici)1098-2795(199711)48:3<317::aid-mrd3>3.0.co;2-u
Subject(s) - vitellogenin , biology , estrogen receptor , rainbow trout , gene , estrogen , gene expression , estrogen receptor alpha , estrogen receptor beta , regulation of gene expression , medicine , endocrinology , receptor , microbiology and biotechnology , genetics , fish <actinopterygii> , cancer , fishery , breast cancer
In rainbow trout as well as in other species, variability of estrogen receptor (ER) gene expression according to the cell type and the physiological state reflects a differential cell and gene sensitivity to estrogen. We previously demonstrated that expression of the rainbow trout estrogen receptor (rtER) and vitellogenin (Vg) genes were induced differently by estrogens in rainbow trout liver. Therefore, these two genes offered a suitable model to study the influence of ER concentration on gene transcriptional activities. In the present study we show that the transcription rate of rtER and Vg genes during an estrogenic treatment are affected differently by variation of cellular ER concentration. We demonstrate that rtER gene exhibits a low threshold response to loaded estrogen receptor, and increasing ER amounts do not affect the transcriptional response of this gene during an estrogenic stimulation. On the contrary, Vg gene expression requires the presence of a higher loaded estrogen receptor level to be induced, and its transcriptional response is directly proportional to the amount of synthesised ER. Mol. Reprod. Dev. 48:317–323, 1997. © 1997 Wiley‐Liss, Inc.