Cenci Alberto auteur aut IRD Combes Marie-Christine auteur aut IRD Lashermes Philippe auteur aut IRD text journalArticle eng text/pdf born digital access The complete sequence of Vitis vinifera revealed that the rosid clade derives from a hexaploid ancestor. At present, no analysis of complete genome sequence is available for an asterid, the other large eudicot clade, which includes the economically important species potato, tomato and coffee. To elucidate the genomic history of asterids, we compared the sequence of an 800 kb region of diploid Coffea genome to the orthologous regions of V. vinifera, Populus trichocarpa and Arabidopsis thaliana. We found a very high level of collinearity between around 80 genes of the three rosid species and Coffea. Collinearity comparisons between orthologous and paralogous regions indicates that (1) the Coffea (and consequently all asterids) and rosids share the same hexaploid ancestor; (2) the diploidization process (loss of duplicated and redundant copies from the whole genome duplication) was very advanced in the most recent common ancestor of rosids and asterids. Finally, no additional polyploidization events were detected in the Coffea lineage. Differences in gene loss rates were detected among the three rosid species and linked to the divergence in protein sequences. specialized Paleo-polyploid Comparative genomics Coffea Asterids Rosids 076 283 5 493-501 2010 1617-4615 https://www.documentation.ird.fr/hor/fdi:010049477 10.1007/s00438-010-0534-7 1617-4615 [F B010049477] https://www.documentation.ird.fr/hor/fdi:010049477 https://www.documentation.ird.fr/intranet/publi/2010/05/010049477.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2010-06-02 2017-08-23 fdi:010049477 fre