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BMC Genomics

, 15:187

Comparative and evolutionary genomics

Abstract

BackgroundThe recent access to a large set of genome sequences, combined with a robust evolutionary scenario of modern monocot i.e. grasses and eudicot i.e. rosids species from their founder ancestors, offered the opportunity to gain insights into disease resistance genes R-genes evolutionary plasticity.

ResultsWe unravel in the current article i a R-genes repertoire consisting in 7883 for monocots and 15758 for eudicots, ii a contrasted R-genes conservation with 23.8% for monocots and 6.6% for dicots, iii a minimal ancestral founder pool of 384 R-genes for the monocots and 150 R-genes for the eudicots, iv a general pattern of organization in clusters accounting for more than 60% of mapped R-genes, v a biased deletion of ancestral duplicated R-genes between paralogous blocks possibly compensated by clusterization, vi a bias in R-genes clusterization where Leucine-Rich Repeats act as a ‘glue’ for domain association, vii a R-genes-miRNAs interome enriched toward duplicated R-genes.

ConclusionsTogether, our data may suggest that R-genes family plasticity operated during plant evolution i at the structural level through massive duplicates loss counterbalanced by massive clusterization following polyploidization; as well as at ii the regulation level through microRNA-R-gene interactions acting as a possible source of functional diploidization of structurally retained R-genes duplicates. Such evolutionary shuffling events leaded to CNVs i.e. Copy Number Variation and PAVs i.e. Presence Absence Variation between related species operating in the decay of R-genes colinearity between plant species.

KeywordsR-genes Duplication Plasticity Evolution Electronic supplementary materialThe online version of this article doi:10.1186-1471-2164-15-187 contains supplementary material, which is available to authorized users.

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Autor: Rongzhi Zhang - Florent Murat - Caroline Pont - Thierry Langin - Jerome Salse

Fuente: https://link.springer.com/



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