Figure 1. Heterochromatic Modification of Chromosome 4 in Arabidopsis Cell Suspension Cultures.

One megabase encompassing the heterochromatic knob on the short arm of chromosome 4 and the flanking euchromatic region are displayed. Genes are depicted in yellow, DNA transposons are in red and orange, and retrotransposons are in green in the annotation (Anno) and Repbase tracks (Comp). DNA methylation profiles of cell suspension culture and the reference Col seedling DNA methylation profile [51] are presented as red bars. Tiles with significant enrichment of H3K4me2 and H3K9me2 are shown in purple, while those tiles associated with H3K56ac are shown in green. A 100-bp–resolution sliding window analysis of sRNA frequencies, corrected for sRNA library size and genomic copy number, for 21- and 24-nt size fractions is shown.