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Article Dans Une Revue Genome Biology and Evolution Année : 2013

Shared sub-genome dominance following polyploidization explains grass genome evolutionary plasticity from a 7 protochromosome ancestor with 16K protogenes

Résumé

Modern plant genomes are diploidized paleopolyploids. We revisited grass genome paleohistory in response to the diploidization process through a detailed investigation of the evolutionary fate of duplicated blocks. Ancestrally duplicated genes can be conserved, deleted and shuffled, defining dominant (bias towards duplicate retention) and sensitive (bias towards duplicate erosion) chromosomal fragments. We propose a new grass genome paleohistory deriving from an ancestral karyotype structured in 7 protochromosomes containing 16,464 protogenes and following evolutionary rules where (i) ancestral shared polyploidizations shaped conserved dominant (D) and sensitive (S) sub-genomes, (ii) sub-genome dominance is revealed by both gene deletion and shuffling from the S blocks, (iii) duplicate deletion/movement may have been mediated by single/double stranded illegitimate recombination mechanisms, (iv) modern genomes arose through centromeric fusion of protochromosomes, leading to functional monocentric neochromosomes, (v) the fusion of two dominant blocks leads to supradominant neochromosomes (D+D=D) with higher ancestral gene retention compared to D+S=D (i.e. fusion of blocks with opposite sensitivity) or even S+S=S (i.e. fusion of two sensitive ancestral blocks). A new user friendly online tool named 'PlantSyntenyViewer', available at http://urgi.versailles.inra.fr/synteny-cereal, presents the refined comparative genomics data.
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Dates et versions

hal-00964190 , version 1 (27-05-2020)

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Florent Murat, Rongzhi R. Zhang, Sébastien S. Guizard, Raphaël-Gauthier R.-G. Flores, Alix A. Armero Villanueva, et al.. Shared sub-genome dominance following polyploidization explains grass genome evolutionary plasticity from a 7 protochromosome ancestor with 16K protogenes. Genome Biology and Evolution, 2013, 6 (1), pp.12-33. ⟨10.1093/gbe/evt200⟩. ⟨hal-00964190⟩
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