Abstract

The vast majority of animals reproduce sexually, i.e. with recombination of genetic material between generations. This genetic mixing is thought to favor the persistence of sexual lineages despite a theoretical advantage of asexuals regarding colonization capacity and population growth. In this context Bdelloid Rotifers, a highly diversified group of animals evolving asexually for millions of years, appears as a puzzle but also as an outstanding model to better understand long-term evolution in the absence of sexual reproduction.
The sequencing of the first Bdelloid Rotifer genome (Flot et al. 2013) revealed a peculiar organization, characterized by a degenerate tetraploidy, numerous rearrangements and the absence of homologous chromosomes. This structure, incompatible with meiosis, likely testifies the long asexual evolution of this genome. Besides, population genetic studies suggest that Bdelloids might exchange DNA within and between species, which likely plays a major role in their evolutionary history (Debortoli et al. 2016).
To better understand the dynamics of gene conversion and horizontal genetic transfers on these asexually evolving genomes and their importance in the success of Bdelloids, we are generating genomic data (RAD sequencing) from a large number of species distributed across the four existing families. We will show how methods involving the reconciliation of gene and species trees can help resolving species phylogeny of Bdelloids despite asexuality, polyploidy, gene conversions, transfers and losses. The resolution of the species tree is indeed a requirement for further study of the dynamics of horizontal transfers, which might play a key role in their evolution.
Original languageEnglish
Publication statusPublished - 2017
EventAnnual Meeting of the Society for Molecular Biology and Evolution (SMBE) - Austin, Texas, United States
Duration: 7 Jul 2017 → …

Conference

ConferenceAnnual Meeting of the Society for Molecular Biology and Evolution (SMBE)
CountryUnited States
CityAustin, Texas
Period7/07/17 → …

Fingerprint

gene conversion
Rotifera
genome
genetic recombination
sexual reproduction
polyploidy
meiosis
tetraploidy
population genetics
population growth
animals
chromosomes
genomics
history
phylogeny
DNA
genes
methodology

Keywords

  • Bdelloid rotifers
  • sex evolution
  • phylogenetics

Cite this

Cariou, M., Henri, H., Debortoli, N., Terwagne, M., Hespeels, B., Virgo, J., ... Van Doninck, K. (2017). Species tree, frequent HGT and gene conversions in Bdelloid Rotifers. Poster session presented at Annual Meeting of the Society for Molecular Biology and Evolution (SMBE), Austin, Texas, United States.
Cariou, Marie ; Henri, Hélène ; Debortoli, Nicolas ; Terwagne, Matthieu ; Hespeels, Boris ; Virgo, Julie ; De Vienne, Damien ; Van Doninck, Karine. / Species tree, frequent HGT and gene conversions in Bdelloid Rotifers. Poster session presented at Annual Meeting of the Society for Molecular Biology and Evolution (SMBE), Austin, Texas, United States.
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abstract = "The vast majority of animals reproduce sexually, i.e. with recombination of genetic material between generations. This genetic mixing is thought to favor the persistence of sexual lineages despite a theoretical advantage of asexuals regarding colonization capacity and population growth. In this context Bdelloid Rotifers, a highly diversified group of animals evolving asexually for millions of years, appears as a puzzle but also as an outstanding model to better understand long-term evolution in the absence of sexual reproduction.The sequencing of the first Bdelloid Rotifer genome (Flot et al. 2013) revealed a peculiar organization, characterized by a degenerate tetraploidy, numerous rearrangements and the absence of homologous chromosomes. This structure, incompatible with meiosis, likely testifies the long asexual evolution of this genome. Besides, population genetic studies suggest that Bdelloids might exchange DNA within and between species, which likely plays a major role in their evolutionary history (Debortoli et al. 2016).To better understand the dynamics of gene conversion and horizontal genetic transfers on these asexually evolving genomes and their importance in the success of Bdelloids, we are generating genomic data (RAD sequencing) from a large number of species distributed across the four existing families. We will show how methods involving the reconciliation of gene and species trees can help resolving species phylogeny of Bdelloids despite asexuality, polyploidy, gene conversions, transfers and losses. The resolution of the species tree is indeed a requirement for further study of the dynamics of horizontal transfers, which might play a key role in their evolution.",
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Cariou, M, Henri, H, Debortoli, N, Terwagne, M, Hespeels, B, Virgo, J, De Vienne, D & Van Doninck, K 2017, 'Species tree, frequent HGT and gene conversions in Bdelloid Rotifers', Annual Meeting of the Society for Molecular Biology and Evolution (SMBE), Austin, Texas, United States, 7/07/17.

Species tree, frequent HGT and gene conversions in Bdelloid Rotifers. / Cariou, Marie; Henri, Hélène; Debortoli, Nicolas; Terwagne, Matthieu; Hespeels, Boris; Virgo, Julie; De Vienne, Damien; Van Doninck, Karine.

2017. Poster session presented at Annual Meeting of the Society for Molecular Biology and Evolution (SMBE), Austin, Texas, United States.

Research output: Contribution to conferencePoster

TY - CONF

T1 - Species tree, frequent HGT and gene conversions in Bdelloid Rotifers

AU - Cariou, Marie

AU - Henri, Hélène

AU - Debortoli, Nicolas

AU - Terwagne, Matthieu

AU - Hespeels, Boris

AU - Virgo, Julie

AU - De Vienne, Damien

AU - Van Doninck, Karine

PY - 2017

Y1 - 2017

N2 - The vast majority of animals reproduce sexually, i.e. with recombination of genetic material between generations. This genetic mixing is thought to favor the persistence of sexual lineages despite a theoretical advantage of asexuals regarding colonization capacity and population growth. In this context Bdelloid Rotifers, a highly diversified group of animals evolving asexually for millions of years, appears as a puzzle but also as an outstanding model to better understand long-term evolution in the absence of sexual reproduction.The sequencing of the first Bdelloid Rotifer genome (Flot et al. 2013) revealed a peculiar organization, characterized by a degenerate tetraploidy, numerous rearrangements and the absence of homologous chromosomes. This structure, incompatible with meiosis, likely testifies the long asexual evolution of this genome. Besides, population genetic studies suggest that Bdelloids might exchange DNA within and between species, which likely plays a major role in their evolutionary history (Debortoli et al. 2016).To better understand the dynamics of gene conversion and horizontal genetic transfers on these asexually evolving genomes and their importance in the success of Bdelloids, we are generating genomic data (RAD sequencing) from a large number of species distributed across the four existing families. We will show how methods involving the reconciliation of gene and species trees can help resolving species phylogeny of Bdelloids despite asexuality, polyploidy, gene conversions, transfers and losses. The resolution of the species tree is indeed a requirement for further study of the dynamics of horizontal transfers, which might play a key role in their evolution.

AB - The vast majority of animals reproduce sexually, i.e. with recombination of genetic material between generations. This genetic mixing is thought to favor the persistence of sexual lineages despite a theoretical advantage of asexuals regarding colonization capacity and population growth. In this context Bdelloid Rotifers, a highly diversified group of animals evolving asexually for millions of years, appears as a puzzle but also as an outstanding model to better understand long-term evolution in the absence of sexual reproduction.The sequencing of the first Bdelloid Rotifer genome (Flot et al. 2013) revealed a peculiar organization, characterized by a degenerate tetraploidy, numerous rearrangements and the absence of homologous chromosomes. This structure, incompatible with meiosis, likely testifies the long asexual evolution of this genome. Besides, population genetic studies suggest that Bdelloids might exchange DNA within and between species, which likely plays a major role in their evolutionary history (Debortoli et al. 2016).To better understand the dynamics of gene conversion and horizontal genetic transfers on these asexually evolving genomes and their importance in the success of Bdelloids, we are generating genomic data (RAD sequencing) from a large number of species distributed across the four existing families. We will show how methods involving the reconciliation of gene and species trees can help resolving species phylogeny of Bdelloids despite asexuality, polyploidy, gene conversions, transfers and losses. The resolution of the species tree is indeed a requirement for further study of the dynamics of horizontal transfers, which might play a key role in their evolution.

KW - Bdelloid rotifers

KW - sex evolution

KW - phylogenetics

M3 - Poster

ER -

Cariou M, Henri H, Debortoli N, Terwagne M, Hespeels B, Virgo J et al. Species tree, frequent HGT and gene conversions in Bdelloid Rotifers. 2017. Poster session presented at Annual Meeting of the Society for Molecular Biology and Evolution (SMBE), Austin, Texas, United States.