These authors contributed equally to this work.
Genic DNA methylation changes during in vitro organogenesis: organ specificity and conservation between parental lines of epialleles
Article first published online: 10 MAY 2012
Copyright © Physiologia Plantarum 2012
Volume 146, Issue 3, pages 321–335, November 2012
How to Cite
Maury, S., Trap-Gentil, M.-V., Hébrard, C., Weyens, G., Delaunay, A., Barnes, S., Lefebvre, M. and Joseph, C. (2012), Genic DNA methylation changes during in vitro organogenesis: organ specificity and conservation between parental lines of epialleles. Physiologia Plantarum, 146: 321–335. doi: 10.1111/j.1399-3054.2012.01634.x
- Issue published online: 4 OCT 2012
- Article first published online: 10 MAY 2012
- Accepted manuscript online: 9 APR 2012 05:46AM EST
- Received 30 September 2011
During differentiation, in vitro organogenesis calls for the adjustment of the gene expression program toward a new fate. The role of epigenetic mechanisms including DNA methylation is suggested but little is known about the loci affected by DNA methylation changes, particularly in agronomic plants for witch in vitro technologies are useful such as sugar beet. Here, three pairs of organogenic and non-organogenic in vitro cell lines originating from different sugar beet (Beta vulgaris altissima) cultivars were used to assess the dynamics of DNA methylation at the global or genic levels during shoot or root regeneration. The restriction landmark genome scanning for methylation approach was applied to provide a direct quantitative epigenetic assessment of several CG methylated genes without prior knowledge of gene sequence that is particularly adapted for studies on crop plants without a fully sequenced genome. The cloned sequences had putative roles in cell proliferation, differentiation or unknown functions and displayed organ-specific DNA polymorphism for methylation and changes in expression during in vitro organogenesis. Among them, a potential ubiquitin extension protein 6 (UBI6) was shown, in different cultivars, to exhibit repeatable variations of DNA methylation and gene expression during shoot regeneration. In addition, abnormal development and callogenesis were observed in a T-DNA insertion mutant (ubi6) for a homologous sequence in Arabidopsis. Our data showed that DNA methylation is changed in an organ-specific way for genes exhibiting variations of expression and playing potential role during organogenesis. These epialleles could be conserved between parental lines opening perspectives for molecular markers.