Article (Scientific journals)
Functional and Evolutionary Analysis of Flatfish Gonadotropin Receptors Reveals Cladal- and Lineage-Level Divergence of the Teleost Glycoprotein Receptor Family
Chauvigné, Francois; Tingaud-Sequeira, Angele; Agulleiro, Maria J et al.
2010In Biology of Reproduction, 82
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Keywords :
gonadotropins; flatfish
Abstract :
[en] Pituitary gonadotropins, follicle-stimulating hormone (FSH), and luteinizing hormone (LH) act via their cognate glycoprotein hormone receptors (GpHRs), FSH receptor (FSHR), and LH/ choriogonadotropin receptor (LHCGR) to regulate gonad physiology. Here, we show that the flatfish Senegalese sole (Solea senegalensis) expresses functional isoforms of fshr and lhcgr, but the genomic origin, ligand activation, and tissue distribution of the receptor transcripts are more complex than expected. By integrating the molecular phylogeny of GpHRs with the syntenic loci of vertebrate orthologs, and by subsequently characterizing the physical maps with the phylogeny of flanking genes, we found that vertebrate GpHRs have undergone a divergent evolution. In Teleostei, fshr genes have a common descent and can be classified as fshra, whereas lhcgrb genes exist as alternatively coded genes even in closely related species. Structural analyses of the receptors revealed that Fshra has an elongated ligand-binding domain, containing an extra leucinerich repeat that specifically arose in the Acanthomorpha because of exon duplication. Ectopic expression in Xenopus laevis oocytes demonstrated that sole Fshra responded to piscine Fsh and Lh, whereas Lhcgrba was preferentially activated by its cognate hormone. The expression pattern of sole fshra and lhcgrba in gonads during the reproductive cycle was consistent with earlier observations wherein Fshra regulates ovarian growth and spermatogenesis and Lhcgrb triggers gamete maturation, respectively. However, contrary to observations in other teleosts, fshra was localized exclusively in Sertoli cells of the testis, whereas lhcgrba was expressed in Leydig cells as well as in spermatids. These results demonstrate the presence of alternatively coded lhcgr isoforms (lhcgrba and lhcgrbb) in teleosts and suggest a role of the lhcgrba receptor in the differentiation of spermatids into spermatozoa in Senegalese sole.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Chauvigné, Francois
Tingaud-Sequeira, Angele
Agulleiro, Maria J
Calusinska, Magdalena ;  Université de Liège - ULiège > Centre d'ingénierie des protéines
Gomez, Ana
Finn, Roderick Nigel
Cerda, Joan
Language :
English
Title :
Functional and Evolutionary Analysis of Flatfish Gonadotropin Receptors Reveals Cladal- and Lineage-Level Divergence of the Teleost Glycoprotein Receptor Family
Alternative titles :
[en] Functional and Evolutionary Analysis of Flatfish Gonadotropin Receptors Reveals Cladal- and Lineage-Level Divergence of the Teleost Glycoprotein Receptor Family
Publication date :
03 March 2010
Journal title :
Biology of Reproduction
ISSN :
0006-3363
eISSN :
1529-7268
Publisher :
Society for the Study of Reproduction, Madison, United States - Wisconsin
Volume :
82
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 24 January 2012

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