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Title: Transition in sexual system and sex chromosome evolution in the tadpole shrimp Triops cancriformis
Authors: Mathers, T. C.
Hammond, Robert L.
Jenner, R. A.
Hänfling, B.
Atkins, J.
Gómez, A.
First Published: 11-Mar-2015
Publisher: Nature Publishing Group for Genetics Society, Genetics Society of Great Britain
Citation: Heredity (2015) 115, 37–46
Abstract: Transitions in sexual system and reproductive mode may affect the course of sex chromosome evolution, for instance by altering the strength of sexually antagonistic selection. However, there have been few studies of sex chromosomes in systems where such transitions have been documented. The European tadpole shrimp, Triops cancriformis, has undergone a transition from dioecy to androdioecy (a sexual system where hermaphrodites and males coexist), offering an excellent opportunity to test the impact of this transition on the evolution of sex chromosomes. To identify sex-linked markers, to understand mechanisms of sex determination and to investigate differences between sexual systems, we carried out a genome-wide association study using Restriction-site Associated DNA sequencing (RAD-seq) of 47 males, females and hermaphrodites from one dioecious and one androdioecious population. We analyzed 22.9 Gb of paired-end sequences and identified and scored >3,000 high coverage novel genomic RAD markers. Presence/absence of markers, SNP association, and read depth identified 52 candidate sex- linked markers. We show that sex is genetically determined in T. cancriformis, with a ZW system conserved across dioecious and androdioecious populations and hermaphrodites likely having evolved from females. We also show that the structure of the sex chromosomes differs strikingly, with a larger sex-linked region in the dioecious population compared to the androdioecious population.
DOI Link: 10.1038/hdy.2015.10
ISSN: 0018-067X
eISSN: 1365-2540
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2015, The Authors. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Description: The sequence data produced in this study is available via the Sequence Read Archive through accession number PRJEB7851 (
Appears in Collections:Published Articles, Dept. of Biology

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