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

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Authors

SLOTTE Tanja HAZZOURI Khaled M. AGREN 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 HU Tina T. BLANCHETTE Mathieu CLARK Richard M. QUESNEVILLE Hadi NORDBORG Magnus GAUT Brandon S. LYSÁK Martin JENKINS Jerry GRIMWOOD Jane CHAPMAN Jarrod PROCHNIK Simon SHU Shengqiang ROKHSAR Daniel SCHMUTZ Jeremy WEIGEL Detlef WRIGHT Stephen I.

Year of publication 2013
Type Article in Periodical
Magazine / Source Nature Genetics
MU Faculty or unit

Central European Institute of Technology

Citation
Web http://www.nature.com/ng/journal/v45/n7/full/ng.2669.html
Doi http://dx.doi.org/10.1038/ng.2669
Field Genetics and molecular biology
Keywords ARABIDOPSIS-THALIANA; TRANSPOSABLE ELEMENTS; MOLECULAR EVOLUTION; RECENT SPECIATION; SEQUENCE; EXPRESSION; GENES; GRANDIFLORA; ANNOTATION; MUTATIONS
Description The shift from outcrossing to selfing is common in flowering plants(1,2), 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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