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

Maitre, D., Selmoni, O. M., Uppal, A., da Cunha, L. M., Wilkins, L. G. E., Roux, J., et al. (2017). Sex differentiation in grayling (Salmonidae) goes through an all-male stage and is delayed in genetic males who instead grow faster. Scientific Reports, 7: 15024. doi:10.1038/s41598-017-14905-9.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-2D9D-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-2D9E-A
Genre: Journal Article

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 Creators:
Maitre, Diane, Author
Selmoni, Oliver M., Author
Uppal, Anshu, Author
da Cunha, Lucas Marques, Author
Wilkins, Laetitia G. E., Author
Roux, Julien, Author
Mobley, Kenyon B.1, Author              
Castro, Isabelle, Author
Knörr, Susanne, Author
Robinson-Rechavi, Marc, Author
Wedekind, Claus, Author
Affiliations:
1Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445634              

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Free keywords: adolescent; case report; embryo development; female; fertilization; gene expression; gonad development; hatching; human; juvenile; male; nonhuman; ovary; phenotype; salmonid; sex determination; sex differentiation; sex ratio; testis tissue
 Abstract: 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. © 2017 The Author(s).

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Language(s): eng - English
 Dates: 2017-05-152017-10-192017-11-032017
 Publication Status: Published in print
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Title: Scientific Reports
  Abbreviation : Sci. Rep.
Source Genre: Journal
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Publ. Info: London, UK : Nature Publishing Group
Pages: 11 Volume / Issue: 7 Sequence Number: 15024 Start / End Page: - Identifier: ISSN: 2045-2322
CoNE: /journals/resource/2045-2322