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| Status |
Public on Sep 18, 2012 |
| Title |
AB1791 H3 N2 L3 Hybridization Rep.2 extraction2_array1 |
| Sample type |
genomic |
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| Channel 1 |
| Source name |
AB1791_H3_N2_L3 channel_1 input DNA
|
| Organism |
Caenorhabditis elegans |
| Characteristics |
strain: N2
developmental stage: L3 Larva
genotype: wild type
Sex: mixed Male and Hermaphrodite population
|
| Growth protocol |
Worm_L3_growth_and_harvest_vPK1. About 2-7 million of worms are bleached and then hatched in M9 for 24-42 hrs. About 100 embryos are seeded onto the plate to test for contamination and hatching efficiency. Remaining hatched L1 larvae are inoculated in a proper volume of liquid culture. Next day when larvae reach the L3 stage they are cleaned by M9 washes and sucrose gradient and collected by freezing in liquid nitrogen. Just before collection DIC pictures are taken and about 50ul of worms are stained for DAPI to assess the stage.
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| Extracted molecule |
genomic DNA |
| Extraction protocol |
Worm_L3_extraction_vPK1. Worms are frozen, ground, and crosslinked for 10 minutes in 1% formaldehyde. Formaldehyde is quenched and cross-linked tissue washed, then resuspended in FA buffer and subjected to sonication in Bioruptor (14 pulses of 30 seconds with 1 minute rests in between). Extracts are then spun down and soluble fraction is stored for quality tests and future ChIP.
Worm_chromatin_immunoprecipitation_vIL2. Appropriate amount of extract is incubated overnight with a proper amount of antibody (exceptional antibodies due to better results are incubated 2hrs). Afterwards, 40ul of equilibrated magnetic beads (either protein A or G, depending on antibody) are added and incubated for 2 hrs. Later, washes with FA, 500mM-salt FA, 1M salt FA, TEL, and TE buffer are performed and DNA is eluted in elution buffer (1% SDS in TE with 250 mM NaCl) ? two times with 57 ?l volume each, at 65°C. Samples are treated with RNAse, proteinase K and then crosslinks are reversed overnight at 65°C. DNA is purified on Qiagen PCR purification columns, tested by q-PCR for ChIP quality, and stored at -20°C for future applications.
Worm_LM-PCR_Amplification_for_ChIP-chip_vIL1. 1/3 of ChIP and 10ng of input are blunted (T4 polymerase), ligated (concentrated T4 ligase) to annealed linkers and amplified by PCR using longer oligonucleotide as a primer. Generally two rounds of amplification are used to get the amount needed for microarray. Amplified DNA is tested by q-PCR and DNA gel is run to ensure small size and lack of degradation.
|
| Label |
Cy3
|
| Label protocol |
ChIP-chip_label_hyb_nimblegen_v2. DNA was labeled and hybridized to NimbleGen C. elegans tiling array (HD2) according to the protocol described in chapter 3 and 4 of the NimbleGen Arrays User?s Guide ChIP-chip Analysis, Version 3.1, 27 May 2008 with slight modifications. Briefly, amplified IP or input DNA was either labeled with Cy5 or Cy3 in the presence of Klenow fragment. The reaction was stopped by the addition of EDTA. Labeled DNA was recovered by isopropanol precipitation, and dried. The labeled DNA was hybridized to C. elegans tiling array for 16 - 20 hours at 42°C.
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| Channel 2 |
| Source name |
AB1791_H3_N2_L3 channel_2 ChIP DNA
|
| Organism |
Caenorhabditis elegans |
| Characteristics |
strain: N2
developmental stage: L3 Larva
genotype: wild type
Sex: mixed Male and Hermaphrodite population
|
| Growth protocol |
Worm_L3_growth_and_harvest_vPK1. About 2-7 million of worms are bleached and then hatched in M9 for 24-42 hrs. About 100 embryos are seeded onto the plate to test for contamination and hatching efficiency. Remaining hatched L1 larvae are inoculated in a proper volume of liquid culture. Next day when larvae reach the L3 stage they are cleaned by M9 washes and sucrose gradient and collected by freezing in liquid nitrogen. Just before collection DIC pictures are taken and about 50ul of worms are stained for DAPI to assess the stage.
|
| Extracted molecule |
genomic DNA |
| Extraction protocol |
Worm_L3_extraction_vPK1. Worms are frozen, ground, and crosslinked for 10 minutes in 1% formaldehyde. Formaldehyde is quenched and cross-linked tissue washed, then resuspended in FA buffer and subjected to sonication in Bioruptor (14 pulses of 30 seconds with 1 minute rests in between). Extracts are then spun down and soluble fraction is stored for quality tests and future ChIP.
Worm_chromatin_immunoprecipitation_vIL2. Appropriate amount of extract is incubated overnight with a proper amount of antibody (exceptional antibodies due to better results are incubated 2hrs). Afterwards, 40ul of equilibrated magnetic beads (either protein A or G, depending on antibody) are added and incubated for 2 hrs. Later, washes with FA, 500mM-salt FA, 1M salt FA, TEL, and TE buffer are performed and DNA is eluted in elution buffer (1% SDS in TE with 250 mM NaCl) ? two times with 57 ?l volume each, at 65°C. Samples are treated with RNAse, proteinase K and then crosslinks are reversed overnight at 65°C. DNA is purified on Qiagen PCR purification columns, tested by q-PCR for ChIP quality, and stored at -20°C for future applications.
Worm_LM-PCR_Amplification_for_ChIP-chip_vIL1. 1/3 of ChIP and 10ng of input are blunted (T4 polymerase), ligated (concentrated T4 ligase) to annealed linkers and amplified by PCR using longer oligonucleotide as a primer. Generally two rounds of amplification are used to get the amount needed for microarray. Amplified DNA is tested by q-PCR and DNA gel is run to ensure small size and lack of degradation.
|
| Label |
Cy5
|
| Label protocol |
ChIP-chip_label_hyb_nimblegen_v2. DNA was labeled and hybridized to NimbleGen C. elegans tiling array (HD2) according to the protocol described in chapter 3 and 4 of the NimbleGen Arrays User?s Guide ChIP-chip Analysis, Version 3.1, 27 May 2008 with slight modifications. Briefly, amplified IP or input DNA was either labeled with Cy5 or Cy3 in the presence of Klenow fragment. The reaction was stopped by the addition of EDTA. Labeled DNA was recovered by isopropanol precipitation, and dried. The labeled DNA was hybridized to C. elegans tiling array for 16 - 20 hours at 42°C.
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| |
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| |
| Hybridization protocol |
ChIP-chip_label_hyb_nimblegen_v2. DNA was labeled and hybridized to NimbleGen C. elegans tiling array (HD2) according to the protocol described in chapter 3 and 4 of the NimbleGen Arrays User?s Guide ChIP-chip Analysis, Version 3.1, 27 May 2008 with slight modifications. Briefly, amplified IP or input DNA was either labeled with Cy5 or Cy3 in the presence of Klenow fragment. The reaction was stopped by the addition of EDTA. Labeled DNA was recovered by isopropanol precipitation, and dried. The labeled DNA was hybridized to C. elegans tiling array for 16 - 20 hours at 42°C.
|
| Scan protocol |
ChIP-chip_scanning_nimblegen_v2. Array scanning and raw data extraction were performed according to the protocol described in chapter 5 and 6 of the NimbleGen Arrays User?s Guide ChIP-chip Analysis, Version 3.1, 27 May 2008. Briefly, array signal was scanned by using a GenePix 4000B Scanner with associated software and saved as .tif files of the 532nm and 635nm images individually. Raw signal intensities of the images were extracted and saved as .pair files by using NimbleScan software v2.5 according to the NimbleScan User?s Guide.
|
| Description |
channel ch1 is input DNA;
channel ch2 is ChIP DNA; Antibody information listed below: official name: C. elegans AB1791 H3 rabbit polyclonal antibody;target name: Histone H3;host: Rabbit;antigen: Synthetic peptide conjugated to KLH derived from within residues 100 to the C-terminus of Human Histone H3;clonal: Polyclonal;purified: Affinity;company: Abcam;catalog: AB1791;short description: An affinity purified rabbit polyclonal antibody to H3 obtained from Abcam (H3-AB1791);used for ChIP.
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| Data processing |
ChIP-chip normalization standard MA2C:JL:2 protocol. ChIP-chip_normalization_standard_MA2C_v2. First, all the IP and INPUT log ratio values are read from the pairdata file. Secondly, we build GC bins for INPUT and IP based on the GC counts for every probe sequence, which means that the INPUT or IP values for any probes which have the same GC counts will be put together. After that, for each GC bin, we calculate the mean for IP and INPUT data, and the covariance between this two channels. By default, the robust mean variance method is applied, which generalizes Tukey's theory of bi-weight estimation where the constant C is set to 2. At last, we adjust the log ratio values for each probe by using the mean and covariance values for their corresponding GC bins, then these values are further normalized by their mean and standard derivation. In a single experiment, median within the sliding window defined by 2x bandwidth parameter is assigned as MA2C score at the center of each probe. In case of replicates, when we calculate the MA2Cscore afterwards, we take the median as the score from all the replicates for all the probes within the sliding window defined by 2x bandwidth parameter. Processed data are obtained using following parameters: genome version is WS190
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| Submission date |
Sep 18, 2012 |
| Last update date |
Jan 28, 2015 |
| Contact name |
DCC modENCODE |
| E-mail(s) |
help@modencode.org
|
| Phone |
416-673-8579
|
| Organization name |
Ontario Institute for Cancer Research
|
| Lab |
modENCODE DCC
|
| Street address |
MaRS Centre, South Tower, 101 College Street, Suite 800
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| City |
Toronto |
| State/province |
Ontario |
| ZIP/Postal code |
M5G 0A3 |
| Country |
Canada |
| |
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| Platform ID |
GPL8647 |
| Series (1) |
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| Relations |
| Reanalysis of |
GSM562748 |
| Supplementary file |
Size |
Download |
File type/resource |
| GSM1005485_AB1791-H3_N2_L3_2_DCC_532.pair.gz |
36.6 Mb |
(ftp)(http) |
PAIR |
| GSM1005485_AB1791-H3_N2_L3_2_DCC_635.pair.gz |
36.5 Mb |
(ftp)(http) |
PAIR |
| GSM1005485_AB1791_H3_N2_L3_2_DCC_MA2Cscore.wig.gz |
9.5 Mb |
(ftp)(http) |
WIG |
| GSM1005485_AB1791_H3_N2_L3_2_DCC_peaks.gff3.gz |
24.9 Kb |
(ftp)(http) |
GFF3 |
| Processed data provided as supplementary file |
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