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Sample GSM386117 Query DataSets for GSM386117
Status Public on Mar 28, 2009
Title L1_H3K4Me3_1_of_3_rep_3
Sample type genomic
 
Channel 1
Source name ChIP, L1 larvae, L1_H3K4Me3_1_of_3_rep_3
Organism Drosophila melanogaster
Characteristics test: ChIP
antibody: H3K4me3
antibody manufacturer: Abcam
antibody catalog number: ab8580
antibody lot number: 411277
time point: L1
tissue: larvae
replicate: 1_of_3_rep_3
Treatment protocol No treatment
Growth protocol 1. y; bw cn sp flies are cultivated in cages with apple juice agar plates covered with yeast powder. 2. For a collection of first instar larvae, new plates are added after a 2hours pre-egglaying at 9 am and flies are allowed to lay eggs for 24 hours. 3. L1 larvae are collected at 8.45 am using a filter mesh and a brush. They are rinsed with EWB and cross-linked at 9 am in 1.8% formaldehyde at room temperature for 15 min.
Extracted molecule genomic DNA
Extraction protocol Drosophila samples are crushed in presence of 1.8% of formaldehyde for 15 minutes. After washing, the material is sonicated for 15 minutes to solubilize the chromatin. After centrifugation, the supernatant containing soluble chromatin is collected for IPs. Specific antibodies are added to the chromatin extract while one aliquot will be treated for DNA extraction corresponding to the reference samples. ChIP are carried overnight at room temperature. Protein A Sepharose beads are used to pull down the chromatin bound antibodies. After washes and finally elution, the DNA corresponding to the IP'd material is extracted and purified. Amplification of the DNA is done by linker-mediated PCR and used for labeling.
Label Cy3
Label protocol 2 ug of amplified IP DNA are used for random primer labeling reaction (invitrogen). Cy3-dCTP is incorporated for the ChIP samples while Cy5-dCTP is incorporated for the Input chromatin sample. After washing of the labeled material on Centricon columns, 5ug of labeled DNA is used for hybridization.
 
Channel 2
Source name Input, L1 larvae, L1_H3K4Me3_1_of_3_rep_3
Organism Drosophila melanogaster
Characteristics reference: Input
time point: L1
tissue: larvae
replicate: 1_of_3_rep_3
Treatment protocol No treatment
Growth protocol 1. y; bw cn sp flies are cultivated in cages with apple juice agar plates covered with yeast powder. 2. For a collection of first instar larvae, new plates are added after a 2hours pre-egglaying at 9 am and flies are allowed to lay eggs for 24 hours. 3. L1 larvae are collected at 8.45 am using a filter mesh and a brush. They are rinsed with EWB and cross-linked at 9 am in 1.8% formaldehyde at room temperature for 15 min.
Extracted molecule genomic DNA
Extraction protocol Drosophila samples are crushed in presence of 1.8% of formaldehyde for 15 minutes. After washing, the material is sonicated for 15 minutes to solubilize the chromatin. After centrifugation, the supernatant containing soluble chromatin is collected for IPs. Specific antibodies are added to the chromatin extract while one aliquot will be treated for DNA extraction corresponding to the reference samples. ChIP are carried overnight at room temperature. Protein A Sepharose beads are used to pull down the chromatin bound antibodies. After washes and finally elution, the DNA corresponding to the IP'd material is extracted and purified. Amplification of the DNA is done by linker-mediated PCR and used for labeling.
Label Cy5
Label protocol 2 ug of amplified IP DNA are used for random primer labeling reaction (invitrogen). Cy3-dCTP is incorporated for the ChIP samples while Cy5-dCTP is incorporated for the Input chromatin sample. After washing of the labeled material on Centricon columns, 5ug of labeled DNA is used for hybridization.
 
 
Hybridization protocol The hybridization solution is composed of 5 ug each of Cy3- and Cy5-labeled DNA, 50 ug of salmon sperm DNA, Agilent Blocking Agent and Agilent Hyb Buffer. The mixture is heated to 95*C for 3 min and then 37*C for 30 minutes immediately prior to hybridization. Samples are hybridized for 40 hours at 65*C. After hybridization the slides are washed in Agilent Wash Buffer 1 for 5 minutes at room temperature and then in Agilent Wash Buffer 2 for 5 minutes at 31*C.
Scan protocol Channel 1 & 2 are for the Agilent arrays are scanned on Agilent's DNA Microarray Scanner G2505B at a resolution of 5 microns. Data is extracted from the images using Agilent's Feature Extraction Software 9.5.3.1.
Description ChIP-chip of H3K4me3 in Drosophila L1 larvae, L1_H3K4Me3_1_of_3_rep_3
Data processing We preprocessed microarray data to normalize it and reduce experimental noise as described in Qi et al. (Qi et al., Nature biotechnology 2006). In short, the raw intensities from each channel was divided by the median intensity from that channel before computing a ratio to arrive at a median adjusted ratio. We further subtracted average value of negative control probes on the array and then added one as a regularization parameter.
 
Submission date Mar 25, 2009
Last update date Aug 19, 2013
Contact name Kevin P. White
E-mail(s) kpwhite@uchicago.edu
Organization name University of Chicago
Department Institute for Genomics and Systems Biology
Street address 900 E. 57th STR. 10th FL.
City Chicago
State/province IL
ZIP/Postal code 60615
Country USA
 
Platform ID GPL6949
Series (2)
GSE15292 Drosophila at different time points of development: ChIP-chip, ChIP-seq, RNA-seq
GSE15424 ChIP-chip of H3K4me3 in Drosophila at different time points of development

Data table header descriptions
ID_REF
VALUE Normalized log ratios between the Cy3 channel and the Cy5 channel intensities.

Data table
ID_REF VALUE
121180 -0.0192383239721531
33716 0.470306049387427
157277 -0.421746966807126
206658 -0.504323968825996
239126 0.0877385718146608
235304 -0.258795529649065
134412 0.0415663058932185
53862 -0.290170706478079
198199 1.40531674657969
196182 -0.429980240296175
126974 0.0906089318810974
151252 0.674156273754542
192607 -0.157991785973262
34113 0.699178470756738
216057 0.112782351419921
135896 1.22278039918461
170628 -0.268532693330709
161522 0.297644360379514
114968 -0.283310234853893
62641 -0.104674350789824

Total number of rows: 237888

Table truncated, full table size 5804 Kbytes.




Supplementary file Size Download File type/resource
GSM386117.txt.gz 67.4 Mb (ftp)(http) TXT
Raw data provided as supplementary file
Processed data included within Sample table

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