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High-resolution profiling of histone methylations in the human genome.


Chromatin, genetics, ultrastructure, Chromosome Breakage, Enhancer Elements, Genetic, Epigenesis, Genetic, Gene Expression Profiling, methods, Gene Expression Regulation, Genome, Human, Histone-Lysine N-Methyltransferase, metabolism, Histones, Humans, Lymphoma, Methylation, Promoter Regions, Genetic, Protein Methyltransferases, RNA Polymerase II, Regulatory Elements, Transcriptional, Transcriptional Activation

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      Histone modifications are implicated in influencing gene expression. We have generated high-resolution maps for the genome-wide distribution of 20 histone lysine and arginine methylations as well as histone variant H2A.Z, RNA polymerase II, and the insulator binding protein CTCF across the human genome using the Solexa 1G sequencing technology. Typical patterns of histone methylations exhibited at promoters, insulators, enhancers, and transcribed regions are identified. The monomethylations of H3K27, H3K9, H4K20, H3K79, and H2BK5 are all linked to gene activation, whereas trimethylations of H3K27, H3K9, and H3K79 are linked to repression. H2A.Z associates with functional regulatory elements, and CTCF marks boundaries of histone methylation domains. Chromosome banding patterns are correlated with unique patterns of histone modifications. Chromosome breakpoints detected in T cell cancers frequently reside in chromatin regions associated with H3K4 methylations. Our data provide new insights into the function of histone methylation and chromatin organization in genome function.

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