Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Chromatin immunoprecipitation of human lymphoblastic cell line GM06990 using anti Histone H3K4me1, H3K4me2, H3K4me3, H3ac and H4ac antibodies using an ENCODE array

ABSTRACT: ENCODE ChIP/chip study using lymphoblastic cell line GM06990 and anti Histone H3K4me1, H3K4me2, H3K4me3, H3ac and H4ac antibodies.

ORGANISM(S): Homo sapiens

SUBMITTER: Christoph Koch

PROVIDER: E-MEXP-269 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Publications

The landscape of histone modifications across 1% of the human genome in five human cell lines.

Koch Christoph M CM Andrews Robert M RM Flicek Paul P Dillon Shane C SC Karaöz Ulaş U Clelland Gayle K GK Wilcox Sarah S Beare David M DM Fowler Joanna C JC Couttet Phillippe P James Keith D KD Lefebvre Gregory C GC Bruce Alexander W AW Dovey Oliver M OM Ellis Peter D PD Dhami Pawandeep P Langford Cordelia F CF Weng Zhiping Z Birney Ewan E Carter Nigel P NP Vetrie David D Dunham Ian I

Genome research 20070601 6

We generated high-resolution maps of histone H3 lysine 9/14 acetylation (H3ac), histone H4 lysine 5/8/12/16 acetylation (H4ac), and histone H3 at lysine 4 mono-, di-, and trimethylation (H3K4me1, H3K4me2, H3K4me3, respectively) across the ENCODE regions. Studying each modification in five human cell lines including the ENCODE Consortium common cell lines GM06990 (lymphoblastoid) and HeLa-S3, as well as K562, HFL-1, and MOLT4, we identified clear patterns of histone modification profiles with res ...[more]

PMID: 17567990

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Project description:Whole genome profiling of 4 histone modifications (H3K27me1, H3K27me3,H3K36me1 and H3K36me3) using ChIP-on-chip. It has recently been shown that nucleosome distribution, histone modifications and RNA polymerase II (Pol II) occupancy show preferential association with exons ("exon-intron marking"), linking chromatin structure and function to co- transcriptional splicing in a variety of eukaryotes. Previous ChIP-sequencing studies suggested that these marking patterns reflect the nucleosomal landscape. By analyzing ChIP-chip datasets across the human genome in three cell types, we have found that this marking system is far more complex than previously observed. We show here that a range of histone modifications and Pol II are preferentially associated with exons. However, there is noticeable cell-type specificity in the degree of exon marking by histone modifications and, surprisingly, this is also reflected in some histone modifications patterns showing biases towards introns. Exon-intron marking is laid down in the absence of transcription on silent genes, with some marking biases changing or becoming reversed for genes expressed at different levels. Furthermore, the relationship of this marking system with splicing is not simple, with only some histone modifications reflecting exon usage/inclusion, while others mirror patterns of exon exclusion. By examining nucleosomal distributions in all three cell types, we demonstrate that these histone modification patterns cannot solely be accounted for by differences in nucleosome levels between exons and introns. In addition, because of inherent differences between ChIP-chip array and ChIP-sequencing approaches, these platforms report different nucleosome distribution patterns across the human genome. Our findings confound existing views and point to active cellular mechanisms which dynamically regulate histone modification levels and account for exon-intron marking. We believe that these histone modification patterns provide links between chromatin accessibility, Pol II movement and co-transcriptional splicing.

Dataset Information

Chromatin immunoprecipitation of human lymphoblastic cell line GM06990 using anti Histone H3K4me1, H3K4me2, H3K4me3, H3ac and H4ac antibodies using an ENCODE array

Publications

The landscape of histone modifications across 1% of the human genome in five human cell lines.

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