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E-GEOD-50719 - DNA Topoisomerase 1a Promotes RNA-directed DNA Methylation and Histone Lysine 9 Dimethylation at Transposable Elements in Arabidopsis [RNA-Seq]

Released on 8 July 2014, last updated on 6 August 2014
Arabidopsis thaliana
Samples (5)
Protocols (3)
RNA-directed DNA methylation (RdDM) is a transcriptional silencing mechanism mediated by small and long noncoding RNAs produced by the plant-specific RNA polymerases Pol IV and Pol V, respectively. Through a chemical genetics screen with a luciferase-based DNA methylation reporter, LUCL, we found that camptothecin, a compound with anti-cancer properties that targets DNA topoisomerase 1a (TOP1a) was able to de-repress LUCL by reducing its DNA methylation and H3K9 dimethylation (H3K9me2) levels. Further studies with Arabidopsis top1a mutants showed that TOP1a promotes RdDM by facilitating the production of Pol V-dependent long non-coding RNAs, AGONAUTE4 recruitment and H3K9me2 deposition at transposable elements (TEs). 5 small RNA libraries were sequenced
Experiment type
RNA-seq of non coding RNA 
Lei Gao, Thanh T Dinh, Xuemei Chen
Exp. designProtocolsVariablesProcessedSeq. reads
Investigation descriptionE-GEOD-50719.idf.txt
Sample and data relationshipE-GEOD-50719.sdrf.txt
Processed data (1)