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- Title
The Capsella rubella genome and the genomic consequences of rapid mating system evolution.
- Authors
Slotte, Tanja; Hazzouri, Khaled M; Ågren, J Arvid; Koenig, Daniel; Maumus, Florian; Guo, Ya-Long; Steige, Kim; Platts, Adrian E; Escobar, Juan S; Newman, L Killian; Wang, Wei; Mandáková, Terezie; Vello, Emilio; Smith, Lisa M; Henz, Stefan R; Steffen, Joshua; Takuno, Shohei; Brandvain, Yaniv; Coop, Graham; Andolfatto, Peter
- 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.
- Subjects
CAPSELLA; NUCLEOTIDE sequence; OUTCROSSING of plants; PLANT genetics; PLANT fertilization; GENE expression; GENETIC polymorphisms in plants
- Publication
Nature Genetics, 2013, Vol 45, Issue 7, p831
- ISSN
1061-4036
- Publication type
Article
- DOI
10.1038/ng.2669