Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Evolutionary history of Methyltransferase 1 genes in hexaploid wheat

Abstract : Background: Plant and animal methyltransferases are key enzymes involved in DNA methylation at cytosine residues, required for gene expression control and genome stability. Taking advantage of the new sequence surveys of the wheat genome recently released by the International Wheat Genome Sequencing Consortium, we identified and characterized MET1 genes in the hexaploid wheat Triticum aestivum (TaMET1). Results: Nine TaMET1 genes were identified and mapped on homoeologous chromosome groups 2A/2B/2D, 5A/5B/5D and 7A/7B/7D. Synteny analysis and evolution rates suggest that the genome organization of TaMET1 genes results from a whole genome duplication shared within the grass family, and a second gene duplication, which occurred specifically in the Triticeae tribe prior to the speciation of diploid wheat. Higher expression levels were observed for TaMET1 homoeologous group 2 genes compared to group 5 and 7, indicating that group 2 homoeologous genes are predominant at the transcriptional level, while group 5 evolved into pseudogenes. We show the connection between low expression levels, elevated evolution rates and unexpected enrichment in CG-dinucleotides (CG-rich isochores) at putative promoter regions of homoeologous group 5 and 7, but not of group 2 TaMET1 genes. Bisulfite sequencing reveals that these CG-rich isochores are highly methylated in a CG context, which is the expected target of TaMET1. Conclusions: We retraced the evolutionary history of MET1 genes in wheat, explaining the predominance of group 2 homoeologous genes and suggest CG-DNA methylation as one of the mechanisms involved in wheat genome dynamics.
Liste complète des métadonnées

Littérature citée [75 références]  Voir  Masquer  Télécharger

https://hal.inrae.fr/hal-02641435
Déposant : Migration Prodinra <>
Soumis le : jeudi 28 mai 2020 - 16:58:57
Dernière modification le : vendredi 12 juin 2020 - 10:43:26

Fichier

2014_Thomas_BMC Genomics_1.pdf
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

Citation

Mélanie Thomas, Lise Pingault, Axel Poulet, Jorge Duarte, Mickaël Throude, et al.. Evolutionary history of Methyltransferase 1 genes in hexaploid wheat. BMC Genomics, BioMed Central, 2014, 15, ⟨10.1186/1471-2164-15-922⟩. ⟨hal-02641435⟩

Partager

Métriques

Consultations de la notice

12

Téléchargements de fichiers

19