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Population genomics of sexual and asexual lineages in fissiparous ribbon worms (Lineus, Nemertea): hybridization, polyploidy and the Meselson effect
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Systematic Biology. Univ Montpellier, Inst Evolutionary Sci, CNRS, IRD,EPHE, Pl Eugene Bataillon, F-34095 Montpellier, France..
Univ Montpellier, Inst Evolutionary Sci, CNRS, IRD,EPHE, Pl Eugene Bataillon, F-34095 Montpellier, France..
Univ Montpellier, Inst Evolutionary Sci, CNRS, IRD,EPHE, Pl Eugene Bataillon, F-34095 Montpellier, France..
Indiana Univ, Dept Biol, 107 S Indiana Ave, Bloomington, IN 47405 USA.;Smithsonian Inst, Natl Museum Nat Hist, Dept Invertebrate Zool, 10th St & Constitut Ave NW, Washington, DC 20560 USA..
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2016 (English)In: Molecular Ecology, ISSN 0962-1083, E-ISSN 1365-294X, Vol. 25, no 14, 3356-3369 p.Article in journal (Refereed) PublishedText
Abstract [en]

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 pi(N)/pi(S) 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.

Place, publisher, year, edition, pages
2016. Vol. 25, no 14, 3356-3369 p.
Keyword [en]
clonality, coding sequences, hybridization, polyploidy, population genomics
National Category
Biochemistry and Molecular Biology Evolutionary Biology
URN: urn:nbn:se:uu:diva-300555DOI: 10.1111/mec.13717ISI: 000379614400010PubMedID: 27286413OAI: oai:DiVA.org:uu-300555DiVA: diva2:951698
EU, European Research Council, 232971
Available from: 2016-08-10 Created: 2016-08-09 Last updated: 2016-08-10Bibliographically approved

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Ament-Velasquez, Sandra Lorena
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