Please note that we have stopped the regular imports of Gene Expression Omnibus (GEO) data into ArrayExpress. This may not be the latest version of this experiment.
E-GEOD-1355 - DNA methylation in Arabidopsis thaliana
Submitted on 29 April 2004, released on 9 June 2010, last updated on 18 October 2011
DNA methylation in wild type bolting plants, wild type seedlings, and ddm1 seedlings. The purpose of the McrBC methylation microarray assay is to determine which regions of a genome are methylated versus those that are unmethylated in a single Arabidopsis thanliana genotype. McrBC is a methylation-sensitive enzyme that restricts DNA only at purine-Cmethyl half sites when separated between 50bp and 3kb. A designated amount of DNA from a particular genotype is sheared to a size range of 1kb-10kb using nebulization. We restrict half of the nebulized DNA with McrBC, and the methylated fraction is then removed from the unmethylated fraction through gel purification of DNA fragments greater than 1kb.* The remaining nebulized DNA is subjected to the same gel purification scheme, but with no McrBC treatment. In a single hybridization, the untreated sample is labeled with Cy5 and the McrBC-treated sample with Cy3. Thus, after labeling and microarray hybridization, the ratio of normalized Cy5 to normalized Cy3 represents the relative methylation at the sequence represented by the spot on the microarray. Dye swap analysis is carried out to take account of experimental variation by repeating the hybridization with identical samples labeled with Cy3 and Cy5, respectively. This SuperSeries is composed of the following subset Series: GSE1329: DNA methylation in wild-type bolting Arabidopsis thaliana plants GSE1330: DNA methylation in ddm1 seedling Arabidopsis thaliana plants GSE1331: VC133+137, DNA methylation in ddm1 seedling Arabidopsis thaliana plants GSE1332: VC134+136, DNA methylation in wild-type seedling Arabidopsis thaliana plants Refer to individual Series
unknown experiment type
Matthew Wayne Vaughn <firstname.lastname@example.org>, M W Vaughn