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The nanos1 gene was duplicated in early Vertebrates and the two paralogs show different gonadal expression profiles in a shark

Authors
  • Gribouval, Laura1, 2
  • Sourdaine, Pascal1
  • Lareyre, Jean-Jacques3
  • Bellaiche, Johanna3
  • Le Gac, Florence3
  • Mazan, Sylvie4
  • Guiardiere, Cécile2
  • Auvray, Pierrïck2
  • Gautier, Aude1
  • 1 Normandie University, UNICAEN, Sorbonne Universités, MNHN, UPMC University Paris 06, UA, CNRS, IRD, Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), CS14032, Cedex 5, 14032 CAEN, France , Cedex 5 (France)
  • 2 KELIA, Parc Technopolitain Atalante Saint Malo, Saint Malo, 35400, France , Saint Malo (France)
  • 3 INRA UPR1037, Laboratory of Fish Physiology and Genomics, BIOSIT, Ouest-Genopole, Rennes, Campus de Beaulieu, 35042, France , Rennes (France)
  • 4 CNRS-UPMC-Sorbonne Universités, UMR 7232, Observatoire océanologique, Banyuls sur mer, 66650, France , Banyuls sur mer (France)
Type
Published Article
Journal
Scientific Reports
Publisher
Springer Nature
Publication Date
May 02, 2018
Volume
8
Issue
1
Identifiers
DOI: 10.1038/s41598-018-24643-1
Source
Springer Nature
License
Green

Abstract

Nanos are RNA-binding proteins playing crucial roles in germ cell development and maintenance. Based on phylogenetic and synteny analyses, this study reveals that nanos1 gene has undergone multiple duplications and gene copies losses in Vertebrates. Chondrichthyan species display two nanos1 genes (named nanos1A/1B), which were both retrieved in some Osteichthyes at basal positions in Sarcopterygii and Actinopterygii lineages. In contrast, Teleosts have lost nanos1A but duplicated nanos1B leading to the emergence of two ohnologs (nanos1Ba/1Bb), whereas Tetrapods have lost nanos1B gene. The two successive nanos gene duplications may result from the second and third whole genome duplication events at the basis of Vertebrates and Teleosts respectively. The expression profiles of nanos1A and nanos1B paralogs were characterized in the dogfish, Scyliorhinus canicula. Nanos1A was strongly expressed in brain and also localized in all germ cell types in the polarized testis. In contrast, nanos1B was detected in testis with the highest expression in the germinative zone. In addition, Nanos1B protein was predominantly located in the nuclei of male germinal cells. In the ovary, both paralogs were detected in germinal and somatic cells. Our study opens new perspectives concerning the complex evolution of nanos1 paralogs and their potential distinct roles in Vertebrates gonads.

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