Sex differentiation in grayling (Salmonidae) goes through an all-male stage and is delayed in genetic males who instead grow faster.

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Ressource 1Télécharger: s41598-017-14905-9.pdf (1893.86 [Ko])
Etat: Serval
Version: Final published version
ID Serval
serval:BIB_F6A409506084
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Sex differentiation in grayling (Salmonidae) goes through an all-male stage and is delayed in genetic males who instead grow faster.
Périodique
Scientific Reports
Auteur(s)
Maitre D., Selmoni O.M., Uppal A., Marques da Cunha L., Wilkins LGE, Roux J., Mobley K.B., Castro I., Knörr S., Robinson-Rechavi M., Wedekind C.
ISSN
2045-2322 (Electronic)
ISSN-L
2045-2322
Statut éditorial
Publié
Date de publication
2017
Peer-reviewed
Oui
Volume
7
Numéro
1
Pages
15024
Langue
anglais
Résumé
Fish populations can be threatened by distorted sex ratios that arise during sex differentiation. Here we describe sex differentiation in a wild grayling (Thymallus thymallus) population that suffers from distorted sex ratios. We verified that sex determination is linked to the sex determining locus (sdY) of salmonids. This allowed us to study sex-specific gene expression and gonadal development. Sex-specific gene expression could be observed during embryogenesis and was strong around hatching. About half of the fish showed immature testes around eleven weeks after fertilization. This phenotype was mostly replaced by the "testis-to-ovary" or "ovaries" phenotypes during development. The gonads of the remaining fish stayed undifferentiated until six months after fertilization. Genetic sexing revealed that fish with undifferentiated gonads were all males, who grew larger than the genetic females during the observational period. Only 12% of the genetic males showed testicular tissue six months after fertilization. We conclude that sex differentiation starts before hatching, goes through an all-male stage for both sexes (which represents a rare case of "undifferentiated" gonochoristic species that usually go through an all-female stage), and is delayed in males. During these juvenile stages males grow faster than females instead of developing their gonads.

Pubmed
Web of science
Création de la notice
19/10/2017 12:16
Dernière modification de la notice
03/03/2018 22:48
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