The effects of haploid selection on Y chromosome evolution in two closely related dioecious plants
The evolution of sex chromosomes is usually considered to be driven by sexually antagonistic selection in the diploid phase. However, selection during the haploid gametic phase of the lifecycle has recently received theoretical attention as possibly playing a central role in sex chromosome evolution...
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Veröffentlicht in: | Evolution letters 2018-08, Vol.2 (4), p.368-377 |
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description | The evolution of sex chromosomes is usually considered to be driven by sexually antagonistic selection in the diploid phase. However, selection during the haploid gametic phase of the lifecycle has recently received theoretical attention as possibly playing a central role in sex chromosome evolution, especially in plants where gene expression in the haploid phase is extensive. In particular, male‐specific haploid selection might favor the linkage of pollen beneficial alleles to male sex determining regions on incipient Y chromosomes. This linkage might then allow such alleles to further specialize for the haploid phase. Purifying haploid selection is also expected to slow the degeneration of Y‐linked genes expressed in the haploid phase. Here, we examine the evolution of gene expression in flower buds and pollen of two species of Rumex to test for signatures of haploid selection acting during plant sex chromosome evolution. We find that genes with high ancestral pollen expression bias occur more often on sex chromosomes than autosomes and that genes on the Y chromosome are more likely to become enriched for pollen expression bias. We also find that genes with low expression in pollen are more likely to be lost from the Y chromosome. Our results suggest that sex‐specific haploid selection during the gametophytic stage of the lifecycle may be a major contributor to several features of plant sex chromosome evolution. |
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G. ; Barrett, Spencer C. H. ; Wright, Stephen I.</creator><creatorcontrib>Sandler, George ; Beaudry, Felix E. G. ; Barrett, Spencer C. H. ; Wright, Stephen I.</creatorcontrib><description>The evolution of sex chromosomes is usually considered to be driven by sexually antagonistic selection in the diploid phase. However, selection during the haploid gametic phase of the lifecycle has recently received theoretical attention as possibly playing a central role in sex chromosome evolution, especially in plants where gene expression in the haploid phase is extensive. In particular, male‐specific haploid selection might favor the linkage of pollen beneficial alleles to male sex determining regions on incipient Y chromosomes. This linkage might then allow such alleles to further specialize for the haploid phase. Purifying haploid selection is also expected to slow the degeneration of Y‐linked genes expressed in the haploid phase. Here, we examine the evolution of gene expression in flower buds and pollen of two species of Rumex to test for signatures of haploid selection acting during plant sex chromosome evolution. We find that genes with high ancestral pollen expression bias occur more often on sex chromosomes than autosomes and that genes on the Y chromosome are more likely to become enriched for pollen expression bias. We also find that genes with low expression in pollen are more likely to be lost from the Y chromosome. Our results suggest that sex‐specific haploid selection during the gametophytic stage of the lifecycle may be a major contributor to several features of plant sex chromosome evolution.</description><identifier>ISSN: 2056-3744</identifier><identifier>EISSN: 2056-3744</identifier><identifier>DOI: 10.1002/evl3.60</identifier><identifier>PMID: 30283688</identifier><language>eng</language><publisher>England: John Wiley & Sons, Inc</publisher><subject>Alleles ; Bias ; Chromosomes ; Competition ; Degeneration ; Evolution ; Evolutionary genetics ; Flowers & plants ; Gene expression ; Genomics ; Haploid selection ; Letter ; Letters ; Males ; Mutation ; ploidy ; Pollen ; pollen expressed genes ; recombination ; Retention ; Rumex ; sex chromosome evolution ; Sex chromosomes ; Y chromosomes</subject><ispartof>Evolution letters, 2018-08, Vol.2 (4), p.368-377</ispartof><rights>2018 The Author(s). published by Wiley Periodicals, Inc. on behalf of Society for the Study of Evolution (SSE) and European Society for Evolutionary Biology (ESEB).</rights><rights>2018. 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G.</creatorcontrib><creatorcontrib>Barrett, Spencer C. H.</creatorcontrib><creatorcontrib>Wright, Stephen I.</creatorcontrib><title>The effects of haploid selection on Y chromosome evolution in two closely related dioecious plants</title><title>Evolution letters</title><addtitle>Evol Lett</addtitle><description>The evolution of sex chromosomes is usually considered to be driven by sexually antagonistic selection in the diploid phase. However, selection during the haploid gametic phase of the lifecycle has recently received theoretical attention as possibly playing a central role in sex chromosome evolution, especially in plants where gene expression in the haploid phase is extensive. In particular, male‐specific haploid selection might favor the linkage of pollen beneficial alleles to male sex determining regions on incipient Y chromosomes. This linkage might then allow such alleles to further specialize for the haploid phase. Purifying haploid selection is also expected to slow the degeneration of Y‐linked genes expressed in the haploid phase. Here, we examine the evolution of gene expression in flower buds and pollen of two species of Rumex to test for signatures of haploid selection acting during plant sex chromosome evolution. We find that genes with high ancestral pollen expression bias occur more often on sex chromosomes than autosomes and that genes on the Y chromosome are more likely to become enriched for pollen expression bias. We also find that genes with low expression in pollen are more likely to be lost from the Y chromosome. 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H. ; Wright, Stephen I.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c3480-86959111b47208533841e3aec80258bcb7a463e8c8d7b988afd15947cc3e82b03</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Alleles</topic><topic>Bias</topic><topic>Chromosomes</topic><topic>Competition</topic><topic>Degeneration</topic><topic>Evolution</topic><topic>Evolutionary genetics</topic><topic>Flowers & plants</topic><topic>Gene expression</topic><topic>Genomics</topic><topic>Haploid selection</topic><topic>Letter</topic><topic>Letters</topic><topic>Males</topic><topic>Mutation</topic><topic>ploidy</topic><topic>Pollen</topic><topic>pollen expressed genes</topic><topic>recombination</topic><topic>Retention</topic><topic>Rumex</topic><topic>sex chromosome evolution</topic><topic>Sex chromosomes</topic><topic>Y chromosomes</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Sandler, George</creatorcontrib><creatorcontrib>Beaudry, Felix E. 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G.</au><au>Barrett, Spencer C. H.</au><au>Wright, Stephen I.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The effects of haploid selection on Y chromosome evolution in two closely related dioecious plants</atitle><jtitle>Evolution letters</jtitle><addtitle>Evol Lett</addtitle><date>2018-08</date><risdate>2018</risdate><volume>2</volume><issue>4</issue><spage>368</spage><epage>377</epage><pages>368-377</pages><issn>2056-3744</issn><eissn>2056-3744</eissn><abstract>The evolution of sex chromosomes is usually considered to be driven by sexually antagonistic selection in the diploid phase. However, selection during the haploid gametic phase of the lifecycle has recently received theoretical attention as possibly playing a central role in sex chromosome evolution, especially in plants where gene expression in the haploid phase is extensive. In particular, male‐specific haploid selection might favor the linkage of pollen beneficial alleles to male sex determining regions on incipient Y chromosomes. This linkage might then allow such alleles to further specialize for the haploid phase. Purifying haploid selection is also expected to slow the degeneration of Y‐linked genes expressed in the haploid phase. Here, we examine the evolution of gene expression in flower buds and pollen of two species of Rumex to test for signatures of haploid selection acting during plant sex chromosome evolution. We find that genes with high ancestral pollen expression bias occur more often on sex chromosomes than autosomes and that genes on the Y chromosome are more likely to become enriched for pollen expression bias. We also find that genes with low expression in pollen are more likely to be lost from the Y chromosome. 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subjects | Alleles Bias Chromosomes Competition Degeneration Evolution Evolutionary genetics Flowers & plants Gene expression Genomics Haploid selection Letter Letters Males Mutation ploidy Pollen pollen expressed genes recombination Retention Rumex sex chromosome evolution Sex chromosomes Y chromosomes |
title | The effects of haploid selection on Y chromosome evolution in two closely related dioecious plants |
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