Analysis of DNA methylome and transcriptome profiling following Gibberellin A3 (GA3) foliar application in Nicotiana tabacum L.

Manoharlal Raman, Saiprasad G. V. S., Kaikala Vinay, Suresh Kumar R., Kovařík Ales

The present work investigated a comprehensive genome-wide landscape of DNA methylome and its relationship with transcriptome upon gibberellin A3 (GA3) foliar application under practical field conditions in solanaceae model, Nicotiana tabacum L. Methylated DNA Immunoprecipitation-Sequencing (MeDIP-Seq) analysis uncovered over 82% (18,456) of differential methylated regions (DMRs) in intergenic-region. Within protein-coding region, 2339 and 1685 of identified DMRs were observed in genebody- and promoter-region, respectively. Microarray study revealed 7032 differential expressed genes (DEGs) with 3507 and 3525 genes displaying upand down-regulation, respectively. Integration analysis revealed 520 unique non-redundant annotated DMRs overlapping with DEGs. Our results indicated that GA3 induced DNA hypo- as well as hyper-methylation were associated with both gene-silencing and -activation. No complete biasness or correlation was observed in either of the promoter- or genebody-regions, which otherwise showed an overall trend towards GA3 induced global DNA hypo-methylation. Taken together, our results suggested that differential DNA methylation mediated by GA3 may only play a permissive role in regulating the gene expression.

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January, 2018


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