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Zebularine, a DNA Methylation Inhibitor, Activates Anthocyanin Accumulation in Grapevine Cells
Junhua Kong1, Virginie Garcia1, Enric Zehraoui1
1UMR Ecophysiologie et Génomique Fonctionnelle de la Vigne, Université de Bordeaux, INRAE, Bordeaux Science Agro, 210 Chemin de Leysotte-33140 Villenave d'Ornon, France.
Genes
|July 27, 2022
Summary
DNA methylation influences anthocyanin production in grapevines. A hypomethylating drug, zebularine, altered DNA methylation at specific gene loci, impacting anthocyanin biosynthesis and gene expression in Gamay Teinturier cells.
Area of Science:
- Plant molecular biology
- Epigenetics
- Grapevine (Vitis vinifera) research
Background:
- DNA methylation is a key epigenetic mechanism regulating gene expression.
- Specialized metabolites, like anthocyanins, play crucial roles in plant development and defense.
- Understanding epigenetic regulation of secondary metabolism is vital for crop improvement.
Purpose of the Study:
- To investigate the role of DNA methylation in controlling anthocyanin accumulation in grapevine.
- To analyze the effects of the hypomethylating drug zebularine on anthocyanin production and gene expression in Gamay Teinturier cell suspensions.
Main Methods:
- Treatment of Gamay Teinturier cell suspensions with zebularine.
- Analysis of cell transcriptome, metabolic content, and global/locus-specific DNA methylation.
- Gene expression analysis of key enzymes in the anthocyanin biosynthesis pathway.
Main Results:
- Zebularine treatment increased anthocyanin accumulation in grapevine cells, even in the dark.
- Global DNA methylation levels showed minor changes, but locus-specific demethylation occurred.
- Demethylation upstream of the UDP glucose:flavonoid-3-O-glucosyltransferase (UFGT) gene correlated with increased UFGT expression and anthocyanin content.
Conclusions:
- Grapevine UFGT gene expression may be regulated by DNA methylation.
- Epigenetic modifications offer potential targets for modulating anthocyanin biosynthesis in grapes.
- Further studies are needed to confirm the functional link between DNA methylation changes and UFGT transcription.
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