title: Convergent recombination suppression suggests role of sexual selection in guppy sex chromosome formation.
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.
authors.affiliation: Department of Genetics, Evolution and Environment, University College London, Darwin Building, Gower Street, London WC1E 6BT, UK.
authors.forename: Alison E
authors.initials: AE
authors.lastname: Wright
authors.affiliation: Department of Genetics, Evolution and Environment, University College London, Darwin Building, Gower Street, London WC1E 6BT, UK.
authors.forename: Iulia
authors.initials: I
authors.lastname: Darolti
authors.affiliation: Department of Genetics, Evolution and Environment, University College London, Darwin Building, Gower Street, London WC1E 6BT, UK.
authors.forename: Natasha I
authors.initials: NI
authors.lastname: Bloch
authors.affiliation: Department of Genetics, Evolution and Environment, University College London, Darwin Building, Gower Street, London WC1E 6BT, UK.
authors.forename: Vicencio
authors.initials: V
authors.lastname: Oostra
authors.affiliation: Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6.
authors.forename: Ben
authors.identifier: 0000-0002-5043-9295
authors.initials: B
authors.lastname: Sandkam
authors.affiliation: Department of Zoology, Stockholm University, Svante Arrheniusväg 18 B, Stockholm 106 91, Sweden.
authors.forename: Severine D
authors.initials: SD
authors.lastname: Buechel
authors.affiliation: Department of Zoology, Stockholm University, Svante Arrheniusväg 18 B, Stockholm 106 91, Sweden.
authors.forename: Niclas
authors.identifier: 0000-0001-5791-336X
authors.initials: N
authors.lastname: Kolm
authors.affiliation: Department of Biological Sciences, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia, Canada V5A 1S6.
authors.forename: Felix
authors.initials: F
authors.lastname: Breden
authors.affiliation: Institute of Science and Technology, Am Campus 1A, Klosterneuburg 3400, Austria.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Vicoso
authors.affiliation: Department of Genetics, Evolution and Environment, University College London, Darwin Building, Gower Street, London WC1E 6BT, UK.
authors.forename: Judith E
authors.initials: JE
authors.lastname: Mank
mesh_terms: D000818:Animals; D005075:Biological Evolution; D003116:Color; D005260:Female; D016678:Genome; D008297:Male; D010858:Pigmentation / Q000235:genetics; D011036:Poecilia / Q000235:genetics*; D011110:Polymorphism, Genetic; D011995:Recombination, Genetic; D012641:Selection, Genetic; D012733:Sex Differentiation; D014960:X Chromosome / Q000737:chemistry*; D014998:Y Chromosome / Q000737:chemistry*