Curated Sample Data

Antigen Class
Input control
Input control
Cell type Class
Cell line
Cell type

Cell type information

Oregon R
Developmental Stage
late embryonic stage

Attributes by Original Data Submitter

Embryonic stem cell and S2 cell line
cell type
Embryonic stem cell and S2 cell line
Wild type

Metadata from Sequence Read Archive

Library Description

Embryonic stem cells were washed once with PBS before crosslinking for 10 minutes with PBS containing 1% formaldehyde (Sigma). Crosslinking was quenched with 0.125M Glycine for 5 minutes before two PBS washes. The crosslinked cells were lysed in 6mL of SDS-Lysis buffer (100mM NaCl, 50mM Tris pH8.1, 5mM EDTA pH 8.0, 0.02% NaN3, 0.5% SDS, 2μg/mL Aprotonin, 1μg/mL Leupeptin, 1mM PMSF). Chromatin was pelleted by centrifugation at 1200rpm for 5 minutes at room temperature. The supernatant was then discarded, and the chromatin was resuspended in 3mL of ChIP buffer (2:1 dilution of SDS-Lysis buffer: Triton dilution buffer [100mM Tris pH 8.6, 100mM NaCl, 5mM EDTA pH 8.0, 0.02% NaN3, 5% Triton X-100, 2μg/mL Aprotonin, 1μg/mL Leupeptin, 1mM PMSF]). Chromatin was sheared to approximately 200bp-600bp fragments by sonication on a Branson Sfx150 Sonifier for a total of 4min at 50% amplitude. Sonicated chromatin was incubated overnight with antibody while rotating at 4°C. Following clarification, the chromatin was incubated for 3 hours with 50µL of protein A or G Dyna beads (ThermoFisher) beads. After incubation, the beads were washed three times in Mixed Micelle Buffer (150mM NaCl, 20mM Tris pH 8.1, 5mM EDTA pH 8.0, 5.2% Sucrose, 0.02% NaN3, 1% Triton X-100, 0.2% SDS), twice with Buffer 500 (0.1% Sodium Deoxycholate, 1mM EDTA pH 8.0, 50mM HEPES pH7.5, 1% Triton X-100, 0.02% NaN3), twice with LiCl detergent wash (0.5% Sodium Deoxycholate, 1mM EDTA pH 8.0, 250mM LiCl, 0.5% NP-40, 10mM Tris pH 8.0, 0.02% NaN3) and finally one wash with TE. Immunoprecipitated material was eluted from the beads with Elution buffer (0.1M NaHCO3, 1% SDS) while shaking for 1 hour at 65°C. The supernatant was retained and incubated overnight at 65°C while shaking to reverse the crosslinks. The eluted complexes were then subject to RNase (Thermo Fisher) and Proteinase K (Sigma) treatment prior to DNA clean up (Qiagen Qiaquick PCR Purification Kit). ChIP enrichments were analysed by qPCR using the SYBR Green I detection chemistry (M3003E NEB) on an Applied Biosystems Quant Studio 3 platform. Following the ChIP experiment, the precipitated DNA was quantified using the Qubit dsDNA High Sensitivity Assay Kit (ThermoFisher Q32854). A Total of 2-10 ng of DNA from each ChIP-Rx experiment was used for library preparation using the NEBNext Ultra II DNA Library Kit for Illumina (E7645) and NEBNext Multiplex Oligos for Illumina (Set#1, NEB #7335). Following adaptor ligation, DNA was PCR amplified for 5-9 cycles, depending on amount of input DNA. DNA purification was then performed using NEBNext Sample Purification Beads (E7767S). The quality of DNA libraries was analysed on a High Senstivity D1000 Screen Tape (Agilent). The resulting libraries were then used for cluster generation and sequencing using an Illumina NextSeq 500 (ID: NB501524), with 75bp read length.

Platform Information

NextSeq 500

External Database Query

Logs in read processing pipeline

Number of total reads
Reads aligned (%)
Duplicates removed (%)
Number of peaks
207 (qval < 1E-05)

Sequence Quality Data from DBCLS SRA