Data version: ENCODE June & Oct 2005 Freezes, Aug 2006 & Jan 2007 data
Description
ENCODE region-wide location analysis of H3 and H4 histones
was conducted employing ChIP-chip using chromatin extracted from
GM06990 (lymphoblastoid),
K562 (myeloid leukemia-derived),
HeLaS3 (cervix carcinoma),
HFL-1 (embryonic lung fibroblast),
MOLT-4 (lymphoblastic leukemia), and
PTR8 cells.
Experiments were conducted with antibodies to the following histones:
H3K4me1,
H3K4me2,
H3K4me3,
H3K9me3,
H3K27me3,
H3K36me3,
H3K79me3,
H3ac,
H4ac, and
CTCF.
Histone methylation and acetylation serves as a stable genomic imprint
that regulates gene expression and other epigenetic
phenomena. These histones are found in transcriptionally active domains
called euchromatin.
Display Conventions and Configuration
This annotation follows the display conventions for composite
"wiggle" tracks. The subtracks within this annotation
may be configured in a variety of ways to highlight different aspects of the
displayed data. The graphical configuration options are shown at the top of
the track description page, followed by a list of subtracks. To display only
selected subtracks, uncheck the boxes next to the tracks you wish to hide.
For more information about the graphical configuration options, click the
Graph
configuration help link.
Methods
Chromatin from the cell line was cross-linked with 1% formaldehyde,
precipitated with antibody binding to the histone, and sheared and hybridized to
the
Sanger ENCODE3.1.1
DNA microarray.
DNA was not amplified prior to hybridization.
The raw and transformed data files reflect fold enrichment over background,
averaged over six replicates.
Verification
There are six replicates: two technical replicates (immunoprecipitations)
for each of the three biological replicates (cell cultures).