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. 2011 Jan 19;39(9):3594–3606. doi: 10.1093/nar/gkq1342

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© The Author(s) 2011. Published by Oxford University Press.

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.5), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 1. — Association of histone marks with different sequences of the Y chromosome. (A) Features of the Y chromosome are shown on the top, telomere, centromere and heterochromatin (black), and euchromatin. Different kinds of sequences in euchromatin are represented as colored blocks on the chromosome, blue (pseudoautosomal region), green (X-degenerate), red (X-transposed) and yellow (ampliconic). To visualize the data clearly, both enriched and not enriched regions have been shown for H3K9me3, H3K9ac and H3K27me3 histone modifications in dark red, blue and orange, respectively (the same convention has been followed in all the other figures also). We observe a specific global pattern of histone marks in different classes of sequences—the pseudoautosomal region is predominately enriched with H3K9ac, the X transposed is enriched with H3K9me3, the X-degenerate region shows almost equal enrichment with all marks and the ampliconic regions show a low enrichment with all histone marks, H3K9me3 being the most enriched. (B) Here we show the average enrichment of histone marks in different classes of sequences distributed along the chromosome. As visually observed in Figure 1A, different classes of sequences have a global pattern of histone marks. The pattern of histone marks in different class of sequences followed the visual observation except in the case of X-degenerate region. In visual analysis X-degenerate is enriched equally with H3K9me3 and H3K9ac but when we calculated average enrichment in different region we found that H3K9ac is more enriched than H3K9me3. In the given table, each class of sequences, from short (p) and long (q) arm are clubbed together to simplify the table.