@article {7272, title = {Unravelling the changes during induced vitellogenesis in female European eel through RNA-Seq: What happens to the liver?}, journal = {PLOS ONE}, volume = {15}, year = {2020}, month = {Jan-08-2021}, pages = {e0236438}, doi = {10.1371/journal.pone.023643810}, url = {https://dx.plos.org/10.1371/journal.pone.0236438}, author = {Bertolini, Francesca and J{\o}rgensen, Michelle Grace Pinto and Henkel, Christiaan and Sylvie Dufour and Tomkiewicz, Jonna} } @article {4508, title = {Three nuclear and two membrane estrogen receptors in basal teleosts, Anguilla sp.: Identification, evolutionary history and differential expression regulation.}, journal = {Gen Comp Endocrinol}, volume = {235}, year = {2016}, month = {2016 Sep 1}, pages = {177-91}, 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.

}, issn = {1095-6840}, doi = {10.1016/j.ygcen.2015.11.021}, author = {Anne-Gaelle Lafont and Karine Rousseau and Tomkiewicz, Jonna and Sylvie Dufour} } @article {3774, title = {Duplicated leptin receptors in two species of eel bring new insights into the evolution of the leptin system in vertebrates.}, journal = {PLoS One}, volume = {10}, year = {2015}, month = {2015}, pages = {e0126008}, abstract = {

Since its discovery in mammals as a key-hormone in reproduction and metabolism, leptin has been identified in an increasing number of tetrapods and teleosts. Tetrapods possess only one leptin gene, while most teleosts possess two leptin genes, as a result of the teleost third whole genome duplication event (3R). Leptin acts through a specific receptor (LEPR). In the European and Japanese eels, we identified two leptin genes, and for the first time in vertebrates, two LEPR genes. Synteny analyses indicated that eel LEPRa and LEPRb result from teleost 3R. LEPRb seems to have been lost in the teleost lineage shortly after the elopomorph divergence. Quantitative PCRs revealed a wide distribution of leptins and LEPRs in the European eel, including tissues involved in metabolism and reproduction. Noticeably, leptin1 was expressed in fat tissue, while leptin2 in the liver, reflecting subfunctionalization. Four-month fasting had no impact on the expression of leptins and LEPRs in control European eels. This might be related to the remarkable adaptation of silver eel metabolism to long-term fasting throughout the reproductive oceanic migration. In contrast, sexual maturation induced differential increases in the expression of leptins and LEPRs in the BPG-liver axis. Leptin2 was strikingly upregulated in the liver, the central organ of the reproductive metabolic challenge in teleosts. LEPRs were differentially regulated during sexual maturation, which may have contributed to the conservation of the duplicated LEPRs in this species. This suggests an ancient and positive role of the leptin system in the vertebrate reproductive function. This study brings new insights on the evolutionary history of the leptin system in vertebrates. Among extant vertebrates, the eel represents a unique case of duplicated leptins and leptin receptors as a result of 3R.

}, issn = {1932-6203}, doi = {10.1371/journal.pone.0126008}, author = {Morini, Marina and Pasquier, J{\'e}r{\'e}my and Dirks, Ron and van den Thillart, Guido and Tomkiewicz, Jonna and Karine Rousseau and Sylvie Dufour and Anne-Gaelle Lafont} }