Gradual evolution of allopolyploidy in Arabidopsis suecica

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Publikace nespadá pod Ekonomicko-správní fakultu, ale pod Středoevropský technologický institut. Oficiální stránka publikace je na webu muni.cz.
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BURNS Robin MALÍK MANDÁKOVÁ Terezie GUNIS Joanna SOTO-JIMÉNEZ Luz Mayela LIU Chang LYSÁK Martin NOVIKOVA Polina Yu. NORDBORG Magnus

Rok publikování 2021
Druh Článek v odborném periodiku
Časopis / Zdroj Nature Ecology & Evolution
Fakulta / Pracoviště MU

Středoevropský technologický institut

Citace
www https://www.nature.com/articles/s41559-021-01525-w
Doi http://dx.doi.org/10.1038/s41559-021-01525-w
Klíčová slova RIBOSOMAL-RNA GENES; NUCLEOLAR DOMINANCE; TRANSPOSABLE ELEMENTS; GENOME ASSEMBLIES; BRASSICA-NAPUS; CD-HIT; POLYPLOIDY; EXPRESSION; COTTON; ELIMINATION
Popis Arabidopsis suecica is a natural allotetraploid species formed via hybridization of Arabidopsis thaliana and Arabidopsis arenosa. Comparative analysis of genome and transcriptome data shows no evidence for major genomic changes linked to structural and functional alterations in A. suecica but reveals changes to the meiotic machinery and cyto-nuclear processes. Most diploid organisms have polyploid ancestors. The evolutionary process of polyploidization is poorly understood but has frequently been conjectured to involve some form of 'genome shock', such as genome reorganization and subgenome expression dominance. Here we study polyploidization in Arabidopsis suecica, a post-glacial allopolyploid species formed via hybridization of Arabidopsis thaliana and Arabidopsis arenosa. We generated a chromosome-level genome assembly of A. suecica and complemented it with polymorphism and transcriptome data from all species. Despite a divergence around 6 million years ago (Ma) between the ancestral species and differences in their genome composition, we see no evidence of a genome shock: the A. suecica genome is colinear with the ancestral genomes; there is no subgenome dominance in expression; and transposon dynamics appear stable. However, we find changes suggesting gradual adaptation to polyploidy. In particular, the A. thaliana subgenome shows upregulation of meiosis-related genes, possibly to prevent aneuploidy and undesirable homeologous exchanges that are observed in synthetic A. suecica, and the A. arenosa subgenome shows upregulation of cyto-nuclear processes, possibly in response to the new cytoplasmic environment of A. suecica, with plastids maternally inherited from A. thaliana. These changes are not seen in synthetic hybrids, and thus are likely to represent subsequent evolution.
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