title: Three nuclear and two membrane estrogen receptors in basal teleosts, Anguilla sp.: Identification, evolutionary history and differential expression regulation.
abstract: Estrogens interact with classical intracellular nuclear receptors (ESR), and with G-coupled membrane receptors (GPER). In the eel, we identified three nuclear (ESR1, ESR2a, ESR2b) and two membrane (GPERa, GPERb) estrogen receptors. Duplicated ESR2 and GPER were also retrieved in most extant teleosts. Phylogeny and synteny analyses suggest that they result from teleost whole genome duplication (3R). In contrast to conserved 3R-duplicated ESR2 and GPER, one of 3R-duplicated ESR1 has been lost shortly after teleost emergence. Quantitative PCRs revealed that the five receptors are all widely expressed in the eel, but with differential patterns of tissue expression and regulation. ESR1 only is consistently up-regulated in vivo in female eel BPG-liver axis during induced sexual maturation, and also up-regulated in vitro by estradiol in eel hepatocyte primary cultures. This first comparative study of the five teleost estradiol receptors provides bases for future investigations on differential roles that may have contributed to the conservation of multiple estrogen receptors.
authors.affiliation: Muséum National d'Histoire Naturelle, Sorbonne Universités, Research Unit BOREA, Biology of Aquatic Organisms and Ecosystems, CNRS 7208, IRD207, UPMC, UCN, Paris, France. Electronic address: lafont@mnhn.fr.
authors.forename: Anne-Gaëlle
authors.initials: AG
authors.lastname: Lafont
authors.affiliation: Muséum National d'Histoire Naturelle, Sorbonne Universités, Research Unit BOREA, Biology of Aquatic Organisms and Ecosystems, CNRS 7208, IRD207, UPMC, UCN, Paris, France.
authors.forename: Karine
authors.initials: K
authors.lastname: Rousseau
authors.affiliation: Technical University of Denmark, National Institute of Aquatic Resources, Charlottenlund, Denmark.
authors.forename: Jonna
authors.initials: J
authors.lastname: Tomkiewicz
authors.affiliation: Muséum National d'Histoire Naturelle, Sorbonne Universités, Research Unit BOREA, Biology of Aquatic Organisms and Ecosystems, CNRS 7208, IRD207, UPMC, UCN, Paris, France. Electronic address: Sylvie.dufour@mnhn.fr.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Dufour
mesh_terms: D000811:Anguilla; D000818:Animals; D005260:Female; D005786:Gene Expression Regulation; D011960:Receptors, Estrogen / Q000378:metabolism*
chemical_list: D011960:Receptors, Estrogen
keywords: Eel; Estrogen membrane receptor; Estrogen nuclear receptor; Evolution; Hepatocytes; Teleosts