Fig. 6

A large segment on the right arm of chromosome 7 shows similarities to an accessory chromosome. The left arm (Cen at 0.259–0.266 Mb) and most of the right arm (up to 1.8 Mb) of chromosome 7 are enriched for H3K4me2 (green) with H3K9me3 (red) and H3K27me3 (orange) found only in the Chr 7L subtelomeric region and TEs. A segment of ~865 kb beginning at 1.8 Mb is enriched with H3K27me3 and lacks gene expression. For each histone modification regions with statistically significant enrichment (see “Methods” for details) are depicted by rectangles in the same color. The apparent second centromeric peak and the strong H3K9me3 peak at position 1.69 Mb are explained by the presence of two rDNA repeats (see “Results” for detail). The ruler indicates chromosome coordinates (Coor, in Mb), and GC-content (%GC, red), centromere position determined by GFP–CenH3 enrichment (Cen, black), location of coding sequences (CDS, blue) and active or inactive transposable elements (TE, marine) are shown