Marie Angèle Grandbastien

..Similar evolutionary relationships are observed to that inferred by previous karyosystematics studies. These observations support the possibility that retrotransposons have contributed to genome inflation during Capsicum evolution...

..The genomes of a centric diatom, Thalassiosira pseudonana, and a pennate diatom, Phaeodactylum tricornutum, that likely diverged around 90 Mya, have recently become available...

..In addition, TntlA transposition preferentially targets genic regions, suggesting that the activity of transposable elements can modulate genic functions and represent a natural source of phenotypic diversity...

..This also demonstrates that the behavior of Tnt1 retrotransposons differs between host species, most probably in correlation to differences in expression conditions and in the evolutionary and environmental history of each host...

..All data stress allopolyploidization as a shock associated with drastic genome reorganization. Mechanisms controlling TEs during allopolyploidization as well as their impact on diploidization are discussed...

..This pattern of diploidization in TE genome fractions supports the hypothesis that TEs are central to long-term genome turnover and depends on both TE and the polyploid lineage considered...

..All elements seem to have inserted roughly 1 million years ago but ZmV1 and Zead8 families present evidences for activity of several master copies within the last 0.4 Mya...

..Our results indicate that the retrotransposon content of a given plant species is strongly influenced by the host evolutionary history, with periods of rapid turnover of retrotransposon sequences stimulated by allopolyploidy...

..Since most of this reorganization is conserved after genome doubling that produced a fertile invasive species, TEs certainly play a central role in the shock-induced dynamics of the genome during allopolyploid speciation...