Convergent recombination suppression suggests role of sexual selection in guppy sex chromosome formation Journal Article

Author(s): Wright, Alison E; Darolti, Iulia; Bloch, Natasha I; Oostra, Vicencio; Sandkam, Benjamin A; Buechel, Séverine D; Kolm, Niclas; Breden, Felix J; Vicoso, Beatriz; Mank, Judith E
Article Title: Convergent recombination suppression suggests role of sexual selection in guppy sex chromosome formation
Affiliation IST Austria
Abstract: Sex chromosomes evolve once recombination is halted between a homologous pair of chromosomes. The dominant model of sex chromosome evolution posits that recombination is suppressed between emerging X and Y chromosomes in order to resolve sexual conflict. Here we test this model using whole genome and transcriptome resequencing data in the guppy, a model for sexual selection with many Y-linked colour traits. We show that although the nascent Y chromosome encompasses nearly half of the linkage group, there has been no perceptible degradation of Y chromosome gene content or activity. Using replicate wild populations with differing levels of sexually antagonistic selection for colour, we also show that sexual selection leads to greater expansion of the non-recombining region and increased Y chromosome divergence. These results provide empirical support for longstanding models of sex chromosome catalysis, and suggest an important role for sexual selection and sexual conflict in genome evolution.
Keywords: Poecilia reticulata
Journal Title: Nature Communications
Volume: 8
ISSN: 2041-1723
Publisher: Nature Publishing Group  
Date Published: 2017-01-31
Start Page: Article number: 14251
Copyright Statement: CC BY 4.0
DOI: 10.1038/ncomms14251
Notes: This work was supported by the European Research Council (grant agreements 260233 and 680951 to J.E.M.), the Swedish Research Council (grant 2012-3624 to N.K.), Natural Sciences and Engineering Research Council of Canada (Discovery Grant to F.B.), Biotechnology and Biological Sciences Research Council (PhD to ID grant number BB/M009513/1), Marie Sklodowska-Curie Fellowships (No 654699 to N.I.B. and No 660172 to V.O.) and a NSF Postdoctoral Research Fellowship in Biology (1523669 to N.I.B.).
Open access: yes (OA journal)