Transition in sexual system and sex chromosome evolution in the tadpole shrimp Triops cancriformis

Heredity
Thomas C MathersAfrica Gómez

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 analysed 22.9 Gb of paired-end sequences and identified and scored >3000 high coverage novel genomic RAD markers. Presence-absence of markers, single-nucleotide polymorphism 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 ...Continue Reading

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Citations

Oct 4, 2016·Journal of Modern Optics·Khabat HeshamiBenjamin J Sussman
Jan 19, 2021·Journal of Theoretical Biology·Sachi Yamaguchi, Yoh Iwasa

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Datasets Mentioned

BETA
PRJEB7851

Methods Mentioned

BETA
PCR
genotyping

Software Mentioned

Triops
ESP
sstacks
Genepop
Stampy

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