GEO Logo
   NCBI > GEO > Accession DisplayHelp Not logged in | LoginHelp
GEO help: Mouse over screen elements for information.
Sample GSM1625775 Query DataSets for GSM1625775
Status Public on Apr 22, 2015
Title Ch8.B118-PM-1hr-bio-replicate1
Sample type SRA
Source name C127 cells
Organism Mus musculus
Characteristics cell cycle phase: 1 hr post-mitosis
cell line: C127
Treatment protocol Cultures were synchronized at mitosis using a 4 hr nocodazole block and then released into G1 for 0.5, 1, 2, 3, 4 hr. G2 syncheonization was obtained by 15 hr release. Cells were synchronized in G0 by 5 day serum starvation.
Growth protocol C127 cells were grown in DMEM with 10% fetal calf serum as decribed in (Lu J, 2010)
Extracted molecule genomic DNA
Extraction protocol Cell cycle synchronized cultures were crosslinked for 10 minutes at RT in 1% formaldehyde. The reaction was quenched for 5 min at RT. We then applied 4C-seq method. Briefly, nuceli were isolated from the cross-linked cells and digested using the restriction enzyme HindIII. Fragments were ligated under dilute conditions and reversed cross-linked. The samples were then digested with DpnII and circularized. Subsequently bait specific primers were used to amplify the interaction partners and sequenced using the Illumina HiSeq 2500 platform, generating 50 bp reads.
Libraries were generated by amplifying the 4C template using bait specific primers with added illumina adaptors. Bait is the genomic loci of interest whose genome-wide interactions are being measured by 4C-seq. We denote each bait by its chromosome followed by letter B and the approximate megabase-scale coordinate of the bait (e.g. Ch8.B26 means bait with a coordinate on 26th megabase of chromosome 8). Twelve baits were chosen based on their replication timing regulation and were named Ch8.B7,Ch8.B26,Ch8.B44,Ch8.B53,Ch8.B87,Ch8.B118,Ch16.B30,Ch16.B41,Ch16.B46,Ch16.B48,Ch17.B50,Ch17.B50 Coordinates are in mm9.
Library strategy OTHER
Library source genomic
Library selection other
Instrument model Illumina HiSeq 2500
Description bar code: CCTCATACAGCTGGAAGCTT
4C-seq library constructed using HindIII.
Data processing Library strategy: 4C-seq
50 bp-long single-end reads were first de-multiplexed using their barcodes and assigned to the corresponding time point and 4C bait. Only the reads that contained one of the valid barcodes was retained for mapping.
Each read was mapped to the mouse genome (UCSC mm9) using the short read alignment mode of BWA (v0.5.9) with default parameter settings. Mapping results were post-processed, and only the reads that mapped uniquely with an alignment quality score of at least 30 and an edit distance of at most 1 were qualified for further analysis.
Each qualified read was assigned to the nearest HindIII cleavage site which represents a restriction fragment.
50 kb upstream and downstream of the bait position was removed from this raw data.
Contact counts at HindIII sites for all chromosomes were windowed (10 kb windows), normalized for sequencing depth and smoothed using a running mean with a span of 30 windows. The resulting smoothed profiles (contact count) were plotted as a function of distance along the chromosome.
Genome_build: mm9
Supplementary_files_format_and_content: rawContactCounts.txt file lists the starting coordinates of all HindIII fragments (defined as the 6-bp recognition site of AAGCTT) and for each such fragment the number of contact counts assigned to that fragment by mapping the library listed in each column.
Submission date Mar 05, 2015
Last update date May 15, 2019
Contact name David M. Gilbert
Phone 8506457583
Organization name Florida State University
Street address 319 Stadium Drive
City Tallahassee
State/province Florida
ZIP/Postal code 32306-4295
Country USA
Platform ID GPL17021
Series (1)
GSE66579 Topologically-associating domains and their long-range contacts are established during early G1 coincident with the establishment of the replication timing program
BioSample SAMN03389495
SRA SRX902463

Supplementary data files not provided
SRA Run SelectorHelp
Raw data are available in SRA
Processed data are available on Series record

| NLM | NIH | GEO Help | Disclaimer | Accessibility |
NCBI Home NCBI Search NCBI SiteMap