ALPAGA workshop - Genome evolution in asexual organisms

From 28 to 30 March 2017 - University of Namur

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The context

Although the question of evolutionary advantages of sexual reproduction has remained unresolved for several decades, important advances have been made over the last years, thanks to Next Generation Sequencing technologies, sophisticated computational tools, extensive phylogenetic information and new statistical methods for testing evolutionary hypotheses via comparative genomics. Genomic data have offered great opportunities to test effects of sexual vs asexual reproduction on patterns of genome structure, genetic diversity and molecular evolution. Genomic tools have also been used to detect the occurrence of sexual reproduction and confirm/invalidate the status of putatively ancient asexual clades. Finally, the newly available complete genome sequences of obligately asexual organisms, especially of an ancient asexual bdelloid rotifer (Flot et al. 2013; Nature 500:453-457) and of the asexual nematode Meloidogyne incognita (Abad et al. 2008; Nature Biotech 26:915-921), enabled the identification of unique genomic peculiarities in asexual lineages.

In 2014 European researchers came together at the University of Lausanne to set-up an international consortium to study the evolutionary genomics of asexual species, with as first initiative the submission of a grant application to France Génomique. The project, entitled ALPAGA (Asexual Lineages and Populations of Animals: a Genomic Analysis) submitted to France Génomique, got granted and started in March 2016. It is a large-scale sequencing project spanning several European laboratories and focusing on a diversity of asexual organisms and their sexual counterparts.

The workshop

Alpaga workshop photoIt is therefore timely, at the start of this project, to organize a scientific meeting to reunite all the researchers of ALPAGA to coordinate the research efforts and discuss the different workpackages outlined within the project. In addition keynote speakers in the field, who have recently published groundbreaking results, are also invited to present their latest results and provide new and critical insights into the project ALPAGA.

This scientific workshop is also open to PhD students and postdoctoral researchers of Belgian Universities.

The ALPAGA workshop was Supported by

Program

14h30-15h00    

Arrivals – welcome package

15h00

Welcome and Introduction – Karine Van Doninck (host at UNamur)

Session 1: Asexual evolution: rare or common? – Chairman: Karine Van Doninck

15h15-16h00

Local recombination suppression in an asexual springtail?

Ken Kraaijeveld (Vrije Universiteit Amsterdam, NL)

16h00-16h45

Automixis in Daphnia: A model for the evolution of clonality?

Christoph Haag (CEFE-CNRS Montpellier, FR)

16h45-17h30

Contagious asexuality in Artemia

Thomas Lenormand (CEFE-CNRS Montpellier, FR)

17h30-18h30

Belgian beers : informal discussions

18h30-19h30

Check-ins at the different hotels or B&B in Namur

19h45

Dinner at the Grill des Tanneurs (35€ drinks included)

Session 2: Evolutionary adaptation in asexuals – Chairman: Bernard Hallet

9h00-9h45

   Adaptive genome evolution in an asexual fungal plant pathogen

   Michael F Seidl (Wageningen University & Research, NL)

9h45-10h30

   Evolutionary genomics of asexual fungi plant pathogens

   Ronnie de Jonge (Utrecht University, NL)

Coffee – tea break

11h00-11h45

  Gene expression and evolutionary rate changes after parallel evolution of asexuality

   in stick insects

  Tanja Schwander (Université de Lausanne, Switzerland)

11h45-12h30

  C-value paradox revisited: Why is there so much intraspecific genome size variation

  in the monogonont rotifer Brachionus asplanchnoidis, and what are the consequences?

  Claus-Peter Stelzer (Universität Inssbruck, AU)

Lunch break

Session 3: Asexuality with hybridization – Chairman: Tanja Schwander

13h30-14h15

  Unorthodox reproductive systems in Cataglyphis desert ants

  Serge Aron (Université Libre de Bruxelles, BE)

14h15-15h00

  Androgenesis in the Asian clam genus Corbicula

  Lise-Marie Pigneur (UNamur, Universite de Liège, BE)

Coffee – tea break

Session 4: Ancient asexual scandals: do they exist and how do they persist? – Chairman: Jean-François Flot

15h30-16h

  Phylogenetic and genomic studies of ancient asexual darwinulid ostracods 

  Isa Schön (Royal Belgian Institute of Natural Sciences, BE)

16h-16h30

  Horizontal gene transfers among asexual bdelloid rotifers of the genus Adineta

  Nicolas Debortoli (Université de Namur, BE)

16h30-17h

  Hybridization and polyploidy enable genomic plasticity without sex in the asexual

  root-knot nematodes

  Etienne Danchin (INRA – Sophia Antipolis, FR)

17h-17h30

  Recent insights into ancient asexual mites 

  Jens Bast (Université de Lausanne, Switzerland)

17h30-19h

  Aperitif during a boat trip around Namur followed by a dinner on board: informal discussions

Session 5: New tools to improve the assembly of heterozygous genomes – Chairman: Etienne Danchin

9h00-9h30

  Assembling heterozygous/polymorphic genomes: challenges and solutions

  Jean-François Flot (Université Libre de Bruxelles, BE)

9h30-10h00

  BWISE: DBG-guided super-read assembly

  Antoine Limasset (INRIA Rennes, FR)

10h00-10h30

  Alienomics

  Jitendra Narayan (Université de Namur, BE)

Coffee – tea break

11h00-11h30

  Oxford Nanopore technology : data and applications

  Jean-Marc Aury (Genoscope, France)

11h30-12h00

  Horizontal gene transfer – population genomic approach in bdelloid rotifers

  Marie Cariou (Université de Namur, BE)

12h-12h20

  ALPAGA I: aim and objectives

  Etienne Danchin (coordinator ALPAGA, INRA – Sophia Antipolis, FR)

12h20-12h40

  ALPAGA II: aim and objectives

  Open discussion on the perspectives of ALPAGA II

Lunch break till 14h30: final discussions and ALPAGA perspectives