Sample information curated by ChIP-Atlas

Antigen

Antigen Class
TFs and others
Antigen
Runx2

Cell type

Cell type Class
Others
Cell type
Mesenchymal stem cells
NA
NA

Attributes by original data submitter

Sample

source_name
marrow derived MSC
cell type
marrow-derived mesenchymal stem cells
differentiation media
osteogenic
treatment
vehicle
antibody
RUNX2 (Santa Cruz, M-70, sc10758, lot# D1411)

Sequenced DNA Library

library_strategy
ChIP-Seq
library_source
GENOMIC
library_selection
ChIP
library_construction_protocol
Chromatin immunoprecipitation was performed as described previously (Meyer MB, Mol Endo. 2012). Briefly, samples were subjected to immuno-precipitation using either a control IgG antibody or the indicated experimental antibody (VDR, RXR, H3K4me1, H3K4me2, H3K4me3, H3K27Ac, H3K5Ac, H3K9Ac, H4K20me1, H3K36me3, or H3K9me3). To remove the calcified matrix from the differentiated cells, the cells were subjected to three 15 minute 300mM EDTA washes following fixation. Subsequently, matrix mix was subjected to 2x10 pulses with a Polytron Homogenizer (Power Gen 125, Fisher Scientific) while in NCP 1 buffer (Hepes 10mM pH 6.5, EDTA 10mM, EGTA 0.5mM, Triton X-100 0.25%). Resulting cell pellet was resuspended in NCP 2 buffer (Hepes 10mM pH 6.5, EDTA 1mM, EGTA 0.5mM, NaCl 200mM) and remainder of protocol was followed. The isolated DNA (or Input DNA acquired prior to precipitation) was then validated by quantitative real time PCR (qPCR) and further prepared for ChIP-seq analysis. ChIP-seq libraries were prepared using the NEBNext DNA sample prep kit (NEB, #E6000L) with the Bioo NEXTflex ChIP-seq Barcodes (Bioo Scientific, Austin, TX, #514122) according to manufacturer’s protocols, with few exceptions. During the NEBNext prep, the Illumina adapters were replaced with the Bioo Scientific Barcoded adapters according to Bioo protocols. ChIP-DNA ligated libraries were cleaned up with Agencourt AMPureXP Magnetic Beads (Beckman-Coulter, #A63881). A pre-size selection PCR was performed using Phusion polymerase, NEXTflex Primer Mix and purified ligation product for 4 cycles of PCR according to the Bioo Protocol. Libraries were size selected using Invitrogen E-gels to a size of 400-500bp. Samples were then PCR amplified for 14 cycles using Phusion polymerase, NEXTflex Primer mix and the size selected DNA as per Bioo protocol, followed by Agencourt bead clean up. Libraries were validated for integrity using the Agilent Bioanalyzer 2100 (Agilent Technologies, Santa Clara, CA). Clusters were formed and sequenced on the Illumina HiSeq2000 sequencers by the University of Wisconsin-Madison DNA Sequencing Facility in the University of Wisconsin-Madison Biotechnology Center. DNA clusters were generated using a cBot Single Read Cluster Generation kit (ver. 3) on an Illumina cBot (Illumina, Carlsbad, CA) according to the manufacturer's instructions, to obtain an average of 1.5×108 clusters for each lane on a flowcell. All sequencing runs for 50mers were performed on an Illumina HiSeq2000 using the Illumina Sequencing kit (ver. 3). Fluorescent images were analyzed using the CASAVA 1.8.2 (Illumina Carlsbad, CA) to obtain FASTQ formatted sequence data. Twelve barcoded libraries were run per lane and this was repeated over 4 lanes. After which, the raw FASTQ for each sample was concatenated from the 4 lanes prior to mapping to create a single sample. The ChIP samples were repeated in biological replicate in the same manner (minimum of 2 replicates). Sequences were mapped to the mouse genome (mm9) using BOWTIE (--best –m 1) to yield unique alignments.

Sequencing Platform

instrument_model
Illumina HiSeq 2000

mm10

Number of total reads
32001564
Reads aligned (%)
61.2
Duplicates removed (%)
35.1
Number of peaks
35999 (qval < 1E-05)

mm9

Number of total reads
32001564
Reads aligned (%)
61.0
Duplicates removed (%)
35.2
Number of peaks
35973 (qval < 1E-05)

Base call quality data from DBCLS SRA