RAD-seq mapping of spontaneous masculinization in XX doubled haploid rainbow trout lines

Sex in rainbow trout is primarily determined by a genetic male heterogametic system encoded by a master sex-determining gene sdY. However, the occurrence of spontaneous phenotypic males in all-female doubled haploid (DH) gynogenetic populations suggested that multiple sex-influencing loci could exis...

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Bibliographic Details
Main Authors: Guyomard, Rene, Guiguen, Yann, Bernard, Maria, Charlet, Aurélie, Dechamp, Nicolas, Hervet, Caroline, Chantry-Darmon, Céline, Krieg, Francine, Quillet, Edwige
Format: Conference Object
Language:English
Published: 2014
Subjects:
salmonids;linkage map;sex determinism
poisson
salmonidae
truite arc en ciel
oncorhynchus mykiss
mâle
femelle
détermination du sexe
reproduction
inversion sexuelle
masculinisation
déterminisme génétique
Atlantic salmon
Online Access:http://prodinra.inra.fr/ft/0C8BB913-86E7-4293-B799-67227952EF8D
http://prodinra.inra.fr/record/312016
Description
Summary:Sex in rainbow trout is primarily determined by a genetic male heterogametic system encoded by a master sex-determining gene sdY. However, the occurrence of spontaneous phenotypic males in all-female doubled haploid (DH) gynogenetic populations suggested that multiple sex-influencing loci could exist in trout as found in other species (tilapia, common carp, Atlantic salmon, zebrafish). In order to get further insight in the genetic determinism of this un-expected masculinization, we crossed a DH XX spontaneously sex-reversed male with a normal female. Two F1 females were then reproduced by mitogynogenesis and their DH progeny (n=168) were genotyped using RAD sequencing. A genome scan of 9500 markers was obtained resulting in a linkage map of 2860 cM. Several putative QTL regions have been identified suggesting that more than one mutation could be involved in the observed deviation from the strict XX/XY sex determinism system.

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