High-Resolution Profiling of Histone Methylations in the Human Genome

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High-Resolution Profiling of Histone Methylations in the Human Genome Artem Barski, Suresh Cuddapah, Kairong Cui, Tae-Young Roh, Dustin E. Schones, Zhibin Wang, Gang Wei, Iouri Chepelev, Keji Zhao  Cell  Volume 129, Issue 4, Pages 823-837 (May 2007) DOI: 10.1016/j.cell.2007.05.009 Copyright © 2007 Elsevier Inc. Terms and Conditions

Figure 1 Analysis of Histone Modifications and Protein Location by ChIP and Direct Sequencing Using Solexa 1G Genome Analyzer (ChIP-Seq) (A) The flow chart of ChIP-Seq. (B) Scatter analysis of two independent analyses of H3K4me3 distribution. Pearon's product-moment correlation between the two samples: r = 0.906 (p-value < 2.2e-16). (C) Comparison of H3K4me3 modification patterns in a 350 kb region on chromosome 19 using ChIP-Seq (upper panel) and using GMAT (lower panel). The data are displayed as custom tracks on the UCSC genome browser (Kent et al., 2002). (D) Comparison of GMAT and ChIP-Seq data at the IL-2 locus. Cell 2007 129, 823-837DOI: (10.1016/j.cell.2007.05.009) Copyright © 2007 Elsevier Inc. Terms and Conditions

Figure 2 Histone Methylation near Transcription Start Sites (A)–(L) Profiles of the histone methylation indicated above each panel across the TSS for highly active, two stages of intermediately active and silent genes are shown. Twelve thousand human genes were separated into twelve groups of one thousand genes according to their expression levels (see Experimental Procedures). Cell 2007 129, 823-837DOI: (10.1016/j.cell.2007.05.009) Copyright © 2007 Elsevier Inc. Terms and Conditions

Figure 3 Correlation of Histone Methylations in Transcribed Regions with Expression Levels (A)–(H) Genes were separated into groups of 100 genes based on their expression levels from high to low (left to right on the x axis). The right y axis indicates the expression level of each group. The left y axis indicates the histone methylation level that was derived by summing up all the detected tags within the entire transcribed gene-body regions and normalized to the total base pair number of the 100 genes. The histone methylation is indicated above each panel from (A) to (H). Cell 2007 129, 823-837DOI: (10.1016/j.cell.2007.05.009) Copyright © 2007 Elsevier Inc. Terms and Conditions

Figure 4 Histone Methylation Patterns of Active and Inactive Genes (A) A typical example of histone methylation patterns at active and inactive genes shown as custom tracks on the UCSC genome browser. (B) Profiles of histone methylation patterns of 1000 highly active or silent genes across the gene bodies (see Experimental Procedures). Density plots extend 5 kb 5′ and 3′ of the gene bodies. Cell 2007 129, 823-837DOI: (10.1016/j.cell.2007.05.009) Copyright © 2007 Elsevier Inc. Terms and Conditions

Figure 5 Epigenetic Modifications at Insulators and Enhancers (A) CTCF binding marks the boundaries of active and inactive domains. H3K4me3, H3K27me1, H3K27me3, and CTCF binding were shown at the PPP5C locus. (B) Histone modification patterns at CTCF-bound insulators. All the CTCF islands excluding those overlapping Pol II islands were aligned, and the tag densities of histone methylations were measured across the islands. The methylation patterns are also shown for 2 kb of DNA on each side of the island. (Inset shows the percentage of CTCF islands associated with different modifications. The numbers on the x axis correspond as follows: 1 = H2A.Z, 2 = H3K9me3, 3 = H3K9me1, 4 = H3K4me3, 5 = H3K4me2, 6 = H3K4me1). (C) Association of H3K4me3, H3K4me1, and H2A.Z with known enhancers of the IFN-γ gene. The three known enhancers of IFN-γ were highlighted in red box and labeled as CNS1, CNS2, and CNS22. The data are displayed as custom tracks on the UCSC genome browser. (D) Histone methylations patterns at enhancers represented by DNase HS sites (Inset shows the percentage of DNase islands associated with different modifications. The numbers on the x axis correspond as follows: 1 = H2A.Z, 2 = H3K9me3, 3 = H3K9me1, 4 = H3K4me3, 5 = H3K4me2, 6 = H3K4me1). (E and F) Cartoons showing characteristic histone methylation patterns of active and silent genes. Promoter and enhancer or insulator regions are indicated. Cell 2007 129, 823-837DOI: (10.1016/j.cell.2007.05.009) Copyright © 2007 Elsevier Inc. Terms and Conditions

Figure 6 Correlation of Histone Methylation Patterns with Chromosomal Features (A) Correlation of chromosome banding with histone methylations. Distribution of H3K4me3, H3K27me3, and H3K9me3 are shown as custom tracks on the UCSC genome browser. (B) ZNF gene repeats are marked by high levels of H3K9me3 and H4K20me3. (C) Chromosome breakpoints are located in regions with histone modifications associated with open chromatin. The breakpoint identified within the IGHA1 gene associated with T cell cancers is highlighted in the red box. Cell 2007 129, 823-837DOI: (10.1016/j.cell.2007.05.009) Copyright © 2007 Elsevier Inc. Terms and Conditions

Figure 7 Prediction of Novel Transcription Units Using Epigenetic Profiles (A) A potential novel TSS downstream of the DHX37 gene. The H3K4me3, H3K36me3, H2BK5me1, and Pol II signals are shown. The potential direction of transcription is indicated by the arrow near the Pol II signals. The region tested for existence of transcripts is marked as a red box. The data are shown as custom tracks on the UCSC genome browser. (B) A potential novel TSS downstream of the PRRG2 gene. (C) RT-PCR analysis of the suspected transcription units. Potential transcripts were analyzed by RT-PCR using primers indicated in panels (A) and (B) as well as in Figure S8. β-actin was used as a control. The DNA size makers are indicated as M. Cell 2007 129, 823-837DOI: (10.1016/j.cell.2007.05.009) Copyright © 2007 Elsevier Inc. Terms and Conditions