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Population genomics of sexual and asexual lineages in fissiparous ribbon worms (Lineus, Nemertea): hybridization, polyploidy and the Meselson effect

Ament-Velásquez, S. L. ; Figuet, E. ; Ballenghien, M. ; Zattara, E. E. ; Norenburg, J. L. ; Fernández-Álvarez, F. A. ; Bierne, J. ; Bierne, N. ; Galtier, N.

Molecular ecology, 2016-07, Vol.25 (14), p.3356-3369 [Periódico revisado por pares]

England: Blackwell Publishing Ltd

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  • Título:
    Population genomics of sexual and asexual lineages in fissiparous ribbon worms (Lineus, Nemertea): hybridization, polyploidy and the Meselson effect
  • Autor: Ament-Velásquez, S. L. ; Figuet, E. ; Ballenghien, M. ; Zattara, E. E. ; Norenburg, J. L. ; Fernández-Álvarez, F. A. ; Bierne, J. ; Bierne, N. ; Galtier, N.
  • Assuntos: Animals ; Biochemistry, Molecular Biology ; Biodiversity ; Biological Evolution ; clonality ; coding sequences ; DNA, Mitochondrial - genetics ; Evolution ; Genetics ; Genetics, Population ; Genomes ; Genomics ; Genotype ; Heterozygote ; hybridization ; Hybridization, Genetic ; Invertebrates - genetics ; Life Sciences ; Lineus ; Nemertea ; Phylogeny ; Polyploidy ; Population genetics ; population genomics ; Populations and Evolution ; Reproduction - genetics ; Reproduction, Asexual - genetics ; Systematics, Phylogenetics and taxonomy ; Transcriptome ; Worms
  • É parte de: Molecular ecology, 2016-07, Vol.25 (14), p.3356-3369
  • Notas: European Research Council - No. 232971
    Fig. S1 Mitochondrial DNA phylogeny of Lineus nemerteans. Fig. S2 Across-contigs distribution of observed heterozygosity in four Lineus species. Fig. S3 Site frequency spectra in sexual (top) and fissiparous (bottom) Lineus species. Fig. S4 Principal component analysis on the matrix of individual genotypes at 2531 SNPs.Table S1 The sampled species and individuals.
    ArticleID:MEC13717
    Agence Nationale de la Recherche - No. ANR-10-BINF-01-01; No. ANR-11-BSV7-007
    University of Maryland and Smithsonian Institution Seed Grant for Research
    istex:8DB8EB399774BF55EA85E93BBC2C05E0F64189DF
    ark:/67375/WNG-TMQ0S5L4-9
    Ministry of Economy and Competitiveness of Spain - No. BES-2013-063551
    Erasmus Mundus Master Programme in Evolutionary Biology
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: Comparative population genetics in asexual vs. sexual species offers the opportunity to investigate the impact of asexuality on genome evolution. Here, we analyse coding sequence polymorphism and divergence patterns in the fascinating Lineus ribbon worms, a group of marine, carnivorous nemerteans with unusual regeneration abilities, and in which asexual reproduction by fissiparity is documented. The population genomics of the fissiparous L. pseudolacteus is characterized by an extremely high level of heterozygosity and unexpectedly elevated πN/πS ratio, in apparent agreement with theoretical expectations under clonal evolution. Analysis of among‐species allele sharing and read‐count distribution, however, reveals that L. pseudolacteus is a triploid hybrid between Atlantic populations of L. sanguineus and L. lacteus. We model and quantify the relative impact of hybridity, polyploidy and asexuality on molecular variation patterns in L. pseudolacteus and conclude that (i) the peculiarities of L. pseudolacteus population genomics result in the first place from hybridization and (ii) the accumulation of new mutations through the Meselson effect is more than compensated by processes of heterozygosity erosion, such as gene conversion or gene copy loss. This study illustrates the complexity of the evolutionary processes associated with asexuality and identifies L. pseudolacteus as a promising model to study the first steps of polyploid genome evolution in an asexual context. See also the Perspective by Hartfield
  • Editor: England: Blackwell Publishing Ltd
  • Idioma: Inglês
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