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Sample GSM2068757 Query DataSets for GSM2068757
Status Public on Jul 18, 2016
Title NHEK_bless_seq_rep1
Sample type SRA
Source name NHEK_bless_seq
Organism Homo sapiens
Characteristics cell line: NHEK
Growth protocol HeLa cells were cultured in DMEM (Sigma, D6429) supplemented with 10% FBS (Gibco, U120D). U2OS AID-DIvA cells were cultured in DMEM supplemented with 10% FBS and 800μg/mL G418 (Gibco, 10131). To induce nuclear localisation of AsiSI, AID-DIvA cells were treated with 300 nM 4OHT (Sigma, H7904) for 4 hours. Primary keratinocytes (Gibco, A13401) were cultured in EpiLife Medium (Gibco, M-EPI-500-CA) supplemented with human keratinocyte growth supplement (Gibco, S-001-5) and were detached using accutase (Sigma, A6964).
Extracted molecule genomic DNA
Extraction protocol The BLESS extraction protocol was implemented as published in Crosetto et al., 2013 (
The TruSeq Nano DNA Library Prep Kit (Illumina, FC-121-4001) was used to generate libraries for sequencing (size selection for 550bps). The BREAk-seq protocol was implemented as described in the Methods sectin of the associated paper (Lensing et al., 2016).
Library strategy OTHER
Library source genomic
Library selection other
Instrument model Illumina NextSeq 500
Description BLESS extracted DNA
Data processing Library strategy: Break-Seq
fastq files containing sequencing reads were pre-processed to remove the Illumina adapters and to trim for low quality tails by using trim_galore (
reads were aligned to the human reference genome (hg19) using the bwa mem aligner ( and cleaned for low quality alignments (mapQ < 10) using samtools (
Duplicates were identified using picard tools ( and removed. Only reads from read 1, which are proximal to the break site, are then retained for the downstream analysis and shown in the bedGraph coverage plots.
Specific for the BLESS libraries: during adapter trimming, the BLESS linker sequences are trimmed (TCGAGGTAGTA and TCGAGACGACG for proximal and distal linkers, respectively), and only read pairs showing both linkers are retained. Trimmed fastq files then undergo the same processing pipeline as for BREAk-seq libraries. At the end, only sequencing reads that originally contained the proximal linker (they could be from either read 1 or read 2) are retained for subsequent analysis and shown in the coverage plots
Genome_build: hg19
Supplementary_files_format_and_content: bedGraph, TDF
Submission date Feb 22, 2016
Last update date May 15, 2019
Contact name Giovanni Marsico
Organization name CRUK Cambridge Institute
Street address Robinson Way
City Cambridge
ZIP/Postal code CB2 0RE
Country United Kingdom
Platform ID GPL18573
Series (1)
GSE78172 DSBCapture: in situ capture and direct sequencing of dsDNA breaks
BioSample SAMN04506972
SRA SRX1596477

Supplementary file Size Download File type/resource
GSM2068757_BLESS_n1.bedGraph.gz 2.2 Gb (ftp)(http) BEDGRAPH
SRA Run SelectorHelp
Raw data are available in SRA
Processed data provided as supplementary file
Processed data are available on Series record

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