Send to

Choose Destination
Epigenetics. 2012 Jan 1;7(1):29-33. doi: 10.4161/epi.7.1.18782. Epub 2012 Jan 1.

The splicing factor SR45 affects the RNA-directed DNA methylation pathway in Arabidopsis.

Author information

Department of Molecular, Cell and Developmental Biology, Campus Universidad Autonoma de Madrid, Madrid, Spain.


Cytosine DNA methylation is an epigenetic mark frequently associated with silencing of genes and transposons. In Arabidopsis, the establishment of cytosine DNA methylation is performed by DOMAINS REARRANGED METHYLTRANSFERASE 2 (DRM2). DRM2 is guided to target sequences by small interfering RNAs (siRNAs) in a pathway termed RNA-directed DNA methylation (RdDM). We performed a screen for mutants that affect the establishment of DNA methylation by investigating genes that contain predicted RNA-interacting domains. After transforming FWA into 429 T-DNA insertion lines, we assayed for mutants that exhibited a late-flowering phenotype due to hypomethylated, thus ectopically expressed, copies of FWA. A T-DNA insertion line within the coding region of the spliceosome gene SR45 (sr45-1) flowered late after FWA transformation. Additionally, sr45-1 mutants display defects in the maintenance of DNA methylation. DNA methylation establishment and maintenance defects present in sr45-1 mutants are enhanced in dcl3-1 mutant background, suggesting a synergistic cooperation between SR45 and DICER-LIKE3 (DCL3) in the RdDM pathway.

[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Taylor & Francis Icon for PubMed Central
Loading ...
Support Center