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Population genomics...
Population genomics of sexual and asexual lineages in fissiparous ribbon worms (Lineus, Nemertea) : hybridization, polyploidy and the Meselson effect
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- Ament-Velasquez, Sandra Lorena (author)
- Uppsala universitet,Systematisk biologi,Univ Montpellier, Inst Evolutionary Sci, CNRS, IRD,EPHE, Pl Eugene Bataillon, F-34095 Montpellier, France.
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- Figuet, E. (author)
- Univ Montpellier, Inst Evolutionary Sci, CNRS, IRD,EPHE, Pl Eugene Bataillon, F-34095 Montpellier, France.
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- Ballenghien, M. (author)
- Univ Montpellier, Inst Evolutionary Sci, CNRS, IRD,EPHE, Pl Eugene Bataillon, F-34095 Montpellier, France.
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- Zattara, E. E. (author)
- 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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- Norenburg, J. L. (author)
- Smithsonian Inst, Natl Museum Nat Hist, Dept Invertebrate Zool, 10th St & Constitut Ave NW, Washington, DC 20560 USA.
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- Fernandez-Alvarez, F. A. (author)
- CSIC Barcelona, Inst Ciencies Mar, Barcelona 08003, Spain.
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- Bierne, J. (author)
- Univ Reims, Lab Biol Cellulaire & Mol, 9 Blvd Paix, F-51100 Reims, France.
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- Bierne, N. (author)
- Univ Montpellier, Inst Evolutionary Sci, CNRS, IRD,EPHE, Pl Eugene Bataillon, F-34095 Montpellier, France.
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- Galtier, N. (author)
- Univ Montpellier, Inst Evolutionary Sci, CNRS, IRD,EPHE, Pl Eugene Bataillon, F-34095 Montpellier, France.
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(creator_code:org_t)
- 2016-07-14
- 2016
- English.
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In: Molecular Ecology. - : Wiley. - 0962-1083 .- 1365-294X. ; 25:14, s. 3356-3369
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Biologi -- Biokemi och molekylärbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biochemistry and Molecular Biology (hsv//eng)
- NATURVETENSKAP -- Biologi -- Evolutionsbiologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Evolutionary Biology (hsv//eng)
Keyword
- clonality
- coding sequences
- hybridization
- polyploidy
- population genomics
Publication and Content Type
- ref (subject category)
- art (subject category)
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