GEO Logo
   NCBI > GEO > Accession DisplayHelp Not logged in | LoginHelp
GEO help: Mouse over screen elements for information.
Sample GSM2265441 Query DataSets for GSM2265441
Status Public on Aug 11, 2017
Title Input Mock
Sample type SRA
Source name Asynchronous population
Organism Caulobacter vibrioides NA1000
Characteristics strain: NA1000
genotype: xylX::pXVENC4 (CJW5796)
expression: Venus fluorescent protein at gene locus expressed at xylose locus, induced 1h30min xylose 0.03% before fixation
Treatment protocol DNA was cross-linked to proteins with addition of 1% formaldehyde in presence of 7.5mM Sodium phosphate pH 7,6. Incubated at room temperature for 10 min and 30min on ice. Cells were collected by centrifugation at 7100 xg rpm for 10 min at 4C. The supernatant was discarded and the pellet washed twice with 20mL PBS buffer, pellet was kept at 4C and used immediately for DNA extraction.
Growth protocol ChIP-seq samples were obtained from mid-log (OD660nm ≈ 0.4) cultures of CJW5534 producing RedN-Venus grown in PYE at 30°C. In parallel, a “mock ChIP” sample was collected from a PYE culture of CJW5796 producing freely diffusing Venus after 1h 30 min of induction with 0.03% xylose.
Extracted molecule genomic DNA
Extraction protocol Immunoprecipitated DNA was extracted as described before (Fumeaux et al., 2014) with the following modifications: PierceTM Protein A/G Magnetic Beads (Thermo Fisher Scientific) and anti-GFP (JL-8) Living Colors® Av Monoclonal Antibody (Clontech Laboratories) were used for protein immunoprecipitation, SDS was excluded from ChIP buffer, Herring sperm DNA was not used to saturate beads and sonication was performed using a Digital Sonifier® S-250D on ice with the 1/8” microtip (Branson Sonic Power Co) with 45% output and 10 cycles of 30 s ON/30 s OFF.
Quality and concentration of the ChIP-DNA was assessed by estimating the A260/A280 and A260/A230 ratios with a Nanodrop device (Thermo Scientific). Library preparation and sequencing was performed by the Yale Center for Genome Analysis as follows: ~10ng of immunoprecipitated DNA was evaluated with a 2100 Bioanalyzer (Agilent Technologies, Santa Clara CA) using a Quant-iT™ DNA Assay Kit high sensitivity (Thermo Fisher Scientific). ChIP-DNA was further purified using Ampure XP SPRI beads (Beckman Coulter Genomics). The DNA was then end-repaired, A-tailed, adapter ligated and PCR enriched (8 -10 cycles). Indexed libraries that met appropriate cut-offs were quantified by both qRT-PCR and insert size distribution determined with the LabChip GX. Samples with a yield of ≥0.5 ng/ul are used for sequencing. Subsequently, for sample concentrations were normalized to 10 nM and loaded into Illumina Rapid or High-output flow cells (Illumina®, San Diego CA) at a concentration that yields 150-250 million passing filter clusters per lane. Samples were sequenced using 75 bp single or paired-end sequencing on an Illumina HiSeq 2500 according to Illumina protocols. The 6 bp index was read during an additional sequencing read that automatically follows the completion of read 1. A positive control (prepared bacteriophage Phi X library) provided by Illumina was spiked into every lane at a concentration of 0.3% to monitor sequencing quality in real time.
Library strategy ChIP-Seq
Library source genomic
Library selection ChIP
Instrument model Illumina HiSeq 2000
Description ControlG2
Data processing The reads from the sequencer were trimmed using FastX Trimmer.
The reads were aligned to the Caulobacter crescentus (NA1000) strain. This reference strain was downloaded from the NCBI Refseq and indexed using bwa. The reads were alined to this index using bwa mem
Perbase coverages were calculated using coverageBed program, and these values were further normalized to million mapped reads.
Genome_build: Caulobacter crescentus (NA1000)
Supplementary_files_format_and_content: The processed files are the normalized coverage files in BEDGRAPH format. The first column denotes the chromosome, the second and their column denote the span, and the last column denotes the normalized coverage per million mapped reads.
Submission date Aug 09, 2016
Last update date May 15, 2019
Contact name Christine Jacobs-Wagner
Phone 203-737-6778
Organization name Yale University
Department Molecular, Cellular and Developmental Biology
Lab Microbial Sciences Institute, Jacobs-Wagner Lab
Street address 840 West Campus Drive, PO BOX 27388
City West Haven
State/province CT
ZIP/Postal code 06516
Country USA
Platform ID GPL18276
Series (1)
GSE85344 ChIP-seq data of RedN-venus from asynchronous and swarmer populations of Caulobacter crescentus NA1000
BioSample SAMN05526401
SRA SRX2009088

Supplementary file Size Download File type/resource
GSM2265441_ControlG2_normalized.bedGraph.gz 20.8 Mb (ftp)(http) BEDGRAPH
SRA Run SelectorHelp
Raw data are available in SRA
Processed data provided as supplementary file

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