Diploid origins and early genome stabilization in the allotetraploid Arabidopsis suecica.

ABSTRACT: Polyploidization, followed by genome downsizing, is a recurrent evolutionary cycle that dramatically reshapes genome structure. Newly formed polyploids must quickly adjust their cell division machinery to maintain stable chromosome inheritance, while long-term stabilization involves rediploidization, returning the genome to a diploid-like state. Here, we investigate the origin and early genome evolution of Arabidopsis suecica, a hybrid polyploid derived from A. thaliana and A. arenosa. Leveraging a recent genome assembly for A. suecica along with population-level whole-genome resequencing of all three species, we identify the closest progenitors to A. suecica and use this knowledge to examine genes under positive selection and to assess compensatory dynamics between homeologs carrying loss

SUBMITTER: Burns R 

PROVIDER: S-EPMC12676072 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature