Evidence of intense chromosomal shuffling during conifer evolution

de Miguel Marina, Bartholomé Jérôme, Ehrenmann François, Murat Florent, Moriguchi Yoshinari, Uchiyama Kentaro, Ueno Saneyoshi, Tsumura Yoshihiko, Lagraulet Hélène, de Maria Nuria, Cabezas José-Antonio, Cervera María-Teresa, Gion Jean-Marc, Salse Jérôme, Plomion Christophe. 2015. Evidence of intense chromosomal shuffling during conifer evolution. Genome Biology and Evolution, 7 (1) : 2799-2809.

https://doi.org/10.1093/gbe/evv185

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Quartile : Q1, Sujet : GENETICS & HEREDITY / Quartile : Q1, Sujet : EVOLUTIONARY BIOLOGY

Résumé : Although recent advances have been gained on genome evolution in angiosperm lineages, virtually nothing is known about karyotype evolution in the other group of seed plants, the gymnosperms. Here, we used high-density gene-based linkage mapping to compare the karyotype structure of two families of conifers (the most abundant group of gymnosperms) separated around 290 Ma: Pinaceae and Cupressaceae. We propose for the first time a model based on the fusion of 20 ancestral chromosomal blocks that may have shaped the modern karyotpes of Pinaceae (with n = 12) and Cupressaceae (with n = 11). The considerable difference in modern genome organization between these two lineages contrasts strongly with the remarkable level of synteny already reported within the Pinaceae. It also suggests a convergent evolutionary mechanism of chromosomal block shuffling that has shaped the genomes of the spermatophytes.

Mots-clés Agrovoc : Pinaceae, Cupressaceae, Angiospermae (799XXXXXXX007), Gymnospermae, génome, caryotype, gène, cartographie, chromosome, évolution, séquence nucléotidique