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Wang, Zhenxing; Schwacke, Rainer; Kunze, Reinhard
Molecular Plant, 08/2016, Letnik: 9, Številka: 8Journal Article
Induction and mobilization of transposable elements (TEs) following DNA damage or other stresses has been reported in prokaryotes and eukaryotes. Recently it was discovered that eukaryotic TEs are frequently associated with long non-coding RNAs (IncRNAs), many of which are also upregulated by stress. Yet, it is unknown whether DNA damage-induced transcriptional activation of TEs and IncRNAs occurs sporadically or is a synchronized, genome-wide response. Here we investigated the transcriptome of Arabidopsis wild- type (WT) and ataxia telangiectasia mutated (atm) mutant plants 3 h after induction of DNA damage. In WT, expression of 5.2% of the protein-coding genes is 〉 2-fold changed, whereas in atm plants, only 2.6% of these genes are regulated, and the response of genes associated with DNA repair, replication, and cell cy- cle is largely lost. In contrast, only less than 0.6% of TEs and IncRNAs respond to DNA damage in WT plants, and the regulation of 〉95% of them is ATM-dependent. The ATM-downstream factors BRCA1, DRM1, JMJ30, AGO2, and the ATM-independent AGO4 participate in the regulation of individual TEs and IncRNAs. Remarkably, protein-coding genes located adjacent to DNA damage-responsive TEs and IncRNAs are frequently coexpressed, which is consistent with the hypothesis that TEs and IncRNAs located close to genes commonly function as controlling elements.
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