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The Capsella rubella genome and the genomic consequences of rapid mating system evolution

Tanja Slotte 1, 2 Khaled M Hazzouri 1, 3 J Arvid Agren 1 Daniel Koenig 4 Florian Maumus 5 Ya-Long Guo 6 Kim Steige 7 Adrian E Platts 8 Juan S Escobar 1 L Killian Newman 1 Wei Wang 1 Terezie Mandáková 9 Emilio Vello 8 Lisa M Smith 4 Stefan R Henz 4 Joshua Steffen 10, 11 Shohei Takuno 12, 13 Yaniv Brandvain 14 Graham Coop 14 Peter Andolfatto 15, 16 Tina T Hu 15, 16 Mathieu Blanchette 17 Richard M Clark 10 Hadi Quesneville 5 Magnus Nordborg 18 Brandon S Gaut 12 Martin A Lysak 9 Jerry Jenkins 19 Jane Grimwood 19 Jarrod Chapman 20 Simon Prochnik 21 Shengqiang Shu 20 Daniel Rokhsar 20, 22 Jeremy Schmutz 19, 20 Detlef Weigel 4 Stephen I Wright 1, 23
Abstract : The shift from outcrossing to selfing is common in flowering plants, but the genomic consequences and the speed at which they emerge remain poorly understood. An excellent model for understanding the evolution of self fertilization is provided by Capsella rubella, which became self compatible <200,000 years ago. We report a C. rubella reference genome sequence and compare RNA expression and polymorphism patterns between C. rubella and its outcrossing progenitor Capsella grandiflora. We found a clear shift in the expression of genes associated with flowering phenotypes, similar to that seen in Arabidopsis, in which self fertilization evolved about 1 million years ago. Comparisons of the two Capsella species showed evidence of rapid genome-wide relaxation of purifying selection in C. rubella without a concomitant change in transposable element abundance. Overall we document that the transition to selfing may be typified by parallel shifts in gene expression, along with a measurable reduction of purifying selection.
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Tanja Slotte, Khaled M Hazzouri, J Arvid Agren, Daniel Koenig, Florian Maumus, et al.. The Capsella rubella genome and the genomic consequences of rapid mating system evolution. Nature Genetics, Nature Publishing Group, 2013, 45 (7), pp.831-835. ⟨10.1038/ng.2669⟩. ⟨hal-02650401⟩

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