Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Platform Protocol PDF
Summary of Content for Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Platform Protocol PDF
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation
Protocol Version 3.0 August 2020
For Research Use Only. Not for use in diagnostic procedures.
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In This Guide... This protocol describes the use of methylation microarrays for the analysis of Methylated DNA Immunoprecipitation (MeDIP).
1 Before You Begin
This chapter contains information (such as procedural notes, safety information, required reagents and equipment) that you need to read and understand before you start an experiment.
2 Sample Preparation
This chapter describes the standard method to process DNA prior to labeling.
3 Sample Labeling
This chapter describes the steps to differentially label the DNA samples with fluorescent-labeled nucleotides.
4 Microarray Processing and Feature Extraction
This chapter describes the steps to hybridize, wash and scan Agilent DNA Methylation microarrays and to extract data using the Agilent Feature Extraction Software for use in Agilent Genomics Workbench.
5 Reference
This chapter contains reference information related to the amplification, labeling, hybridization and wash kits, and the protocol.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 3
Whats new in 3.0 Updated document look and feel. Instructions on handling the newly redesigned secure fit slide boxes in which
the microarray slides are shipped. Before opening the box for the first time, see Secure Fit Slide Box Opening Instructions" on page 63.
Expanded instructions and new images in the Microarray Processing and Feature Extraction procedures to help avoid common problems and optimize hybridization of your sample to the microarray.
Updated web addresses for Agilent materials. Updated Safety Notes. Removed microarray scanning instructions for the Agilent B scanner.
Whats new in 2.3 Corrected fluorescent labeling step to remove preparation of amplified
reference and IP gDNA. Updated temperature for denaturing step. Updated product labeling statement.
4 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
Content
1 Before You Begin 7
Procedural Notes 8 Safety Notes 9 Agilent Methylation Microarray Kit Contents 10 Required Equipment 11 Required Reagents 13 Required Hardware and Software 14
2 Sample Preparation 15
Step 1. Prepare the magnetic beads 17 Step 2. Prepare DNA for Immunoprecipitation 19 Step 3. Immunoprecipitate the methylated DNA 19 Step 4. Wash and elute methylated DNA from beads 20 Step 5. Extract immunoprecipitated and reference DNA with phenol-chloroform 21
3 Sample Labeling 23
Step 1. Fluorescent Labeling of DNA 24 Step 2. Purification of Labeled DNA 26 To determine yield and specific activity 27
4 Microarray Processing and Feature Extraction 29
Microarray Hybridization 30
Step 1. Prepare the 10 Blocking Agent 30 Step 2. Prepare labeled DNA for hybridization 30 Step 3. Prepare the hybridization assembly 34 Step 4. Hybridize 40
Microarray Wash 42
Step 1. Prewarm Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 (overnight) 43 Step 2. Wash with Milli-Q ultrapure water 43 Step 3. Clean with Acetonitrile (Wash Procedure B Only) 43 Step 4. Prewarm Stabilization and Drying Solution (Wash Procedure B
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 5
Content
Only) 44 Step 5. Wash microarrays 45 Step 6. Put slides in a slide holder 51
Microarray Scanning and Feature Extraction 54
Step 1. Scan the microarray slides 54 Step 2. Extract data using the Feature Extraction program 56
5 Reference 61
Reagent Kit Components 62 Secure Fit Slide Box Opening Instructions 63 Microarray Handling Tips 65 Agilent Microarray Layout and Orientation 66 Array/Sample tracking on microarray slides 68 Notes and Considerations 69
6 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
1 Before You Begin Procedural Notes 8 Safety Notes 9 Agilent Methylation Microarray Kit Contents 10 Required Equipment 11 Required Reagents 13 Required Hardware and Software 14
Make sure that you read and understand the information in this chapter and have the necessary equipment and reagents listed before you start an experiment.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 7
1 Before You Begin Procedural Notes
Procedural Notes
To prevent contamination of reagents by nucleases, always wear powder-free laboratory gloves, and use dedicated solutions and pipettors with nuclease-free aerosol-resistant tips.
Maintain a clean work area. Do not mix stock solutions and reactions containing gDNA or enzymes on a
vortex mixer. Instead, mix the solutions and reactions by gently tapping the tube with your finger.
Avoid repeated freeze-thaw cycles of solutions containing gDNA or enzymes. When preparing frozen reagent stock solutions for use:
1 Thaw the aliquot as quickly as possible without heating above room temperature.
2 Mix briefly on a vortex mixer, and then spin in a microcentrifuge for 5 to 10 seconds to drive the contents off the walls and lid.
3 Store on ice or in a cold block until use. In general, follow Biosafety Level 1 (BL1) safety rules.
8 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
1 Before You Begin Safety Notes
Safety Notes
CAUTION Wear appropriate personal protective equipment (PPE) when working in the laboratory.
WARNING Cyanine reagents are considered hazardous by the OSHA Hazard Communication Standard (29 CFR 1910.1200). Contains material that causes damage to the following organs: kidneys, liver, cardiovascular system, respiratory tract, skin, eye lens or cornea, stomach. May be harmful if swallowed. Avoid contact with eyes, skin and clothing.
2 HI-RPM Hybridization Buffer is considered hazardous by the OSHA Hazard Communication Standard (29 CFR 1910.1200). Contains material that causes damage to the following organs: skin, central nervous system. May be harmful if swallowed. Avoid contact with eyes, skin and clothing.
Triton is harmful if swallowed. Risk of serious damage to eyes. Wear suitable PPE. Triton is a component of the Agilent 2 HI-RPM Hybridization Buffer.
Acetonitrile is a flammable liquid and vapor. Harmful if inhaled, swallowed, or contacts skin. Target organs: liver, kidneys, cardiovascular system, and CNS.
Stabilization and Drying Solution is considered hazardous by the OSHA Hazard Communication Standard (29 CFR 1910.1200). Flammable liquid and vapor. Keep away from heat, sparks and flame. Keep container closed. Use only with adequate ventilation. This solution contains material which causes damage to the following organs: kidneys, liver, cardiovascular system, upper respiratory tract, skin, central nervous system (CNS), eye, lens or cornea.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 9
1 Before You Begin Agilent Methylation Microarray Kit Contents
Agilent Methylation Microarray Kit Contents
Store microarray kit at room temperature. After the microarray foil pouch is opened, store the microarray slides at room temperature (in the dark) under a vacuum desiccator or N2 purge box. Do not store microarray slides in open air after breaking foil.
Catalog SurePrint HD Methylation Microarray Kit
One or two microarrays printed on each 1-inch 3-inch glass slide Available as a 5-slide kit, as indicated in Table 1.
Design files can be downloaded from www.agilent.com/genomics/suredesign.
See Table 1 for available designs. For more information on Methylation designs, go to www.agilent.com.
Unrestricted SurePrint HD Methylation Microarrays
One microarray printed on each 1-inch 3-inch glass slide Number of microarray slides vary per kit and per order
Design files can be downloaded from www.agilent.com/genomics/suredesign.
See the tables that follow for available designs.
Custom SurePrint HD and G3 Microarrays
One, two, or four microarray(s) printed on each 1-inch 3-inch glass slide Number of microarrays varies per kit and per order
Table 1 Catalog SurePrint HD Methylation Microarray Kits
Part Number Description
G4492A Human CpG Island Microarray 5-slide Kit, 1244K (HD)
G4811A Mouse CpG Island Microarray, 2105K (HD)
Table 2 Unrestricted SurePrint Methylation Microarrays
Part Number Description
G4495A, AMAIDID 023795 Human DNA Methylation Microarray, 1244K (HD)
10 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
1 Before You Begin Required Equipment
See Table 3 for available formats.
Required Equipment
Table 3 Custom SurePrint HD and G3 Methylation Microarrays
Part Number Description
G4819A Custom SurePrint G3 ChIP-on-chip/DNA Methylation, 11M
G4820A Custom SurePrint G3 ChIP-on-chip/DNA Methylation, 2400K
G4821A Custom SurePrint G3 ChIP-on-chip/DNA Methylation, 4180K
G4496A Custom ChIP-on-chip/DNA Methylation, 1244K
G4498A Custom ChIP-on-chip/DNA Methylation, 2105K
G4497A Custom ChIP-on-chip/DNA Methylation, 444K
Table 4 Required equipment
Description Vendor and part number
200-L Thin-Wall Tube Agilent p/n 410091 or equivalent
Agilent Microarray Scanner Bundle for 1244K, 2105K, or 444K, or for 11M, 2400K, or 4180K
Agilent p/n G4900DA, G2565CA or G2565BA Agilent p/n G4900DA or G2565CA
Hybridization Chamber, stainless Agilent p/n G2534A
Hybridization gasket slides, 5-pack (20 and 100 packaging sizes are available) for 1-pack microarrays or for 2-pack microarrays or for 4-pack microarrays
Agilent p/n G2534-60003 Agilent p/n G2534-60002 Agilent p/n G2534-60011
Hybridization oven; temperature set at 67C Agilent p/n G2545A
Hybridization oven rotator for Agilent Microarray Hybridization Chambers
Agilent p/n G2530-60029
Ozone-barrier slide covers (box of 20)1 Agilent p/n G2505-60550
1.5-mL RNase-free Microfuge Tube (sustainable at 98C)
Thermo Fisher Scientific p/n AM12400 or equivalent
Magnetic stir plate (1 or 3)2 Corning p/n 6795-410 or equivalent
Magnetic stir plate with heating element Corning p/n 6795-420 or equivalent
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 11
1 Before You Begin Required Equipment
Microcentrifuge Eppendorf p/n 5430 or equivalent
Tube rotator Labquake p/n 56264-306 or equivalent
DynaMag-2 Magnet Thermo Fisher Scientific p/n 12321D
Sterile storage bottle Nalgene 455-1000 or equivalent
UV-VIS spectrophotometer NanoDrop 8000 or 2000, or equivalent
P10, P20, P200 and P1000 pipettes Pipetman P10, P20, P200, P1000 or equivalent
1.5 L glass dish Pyrex p/n 213-R or equivalent
MaXtract High Density 2-mL tube Qiagen p/n 129056
Vacuum Concentrator Thermo Scientific Savant SpeedVac p/n DNA130-115 or equivalent
Magnetic stir bar, 7.9 38.1 mm (2 or 4)2 VWR p/n 58948-150 or equivalent
250 mL capacity slide-staining dish, with slide rack (3 or 5)2
Wheaton p/n 900200 or Thermo Fisher Scientific p/n 121
Circulating water baths or heat blocks set to 37C, 65C, and 95
Ice bucket
Clean forceps
Powder-free gloves
Sterile, nuclease-free aerosol barrier pipette tips
Timer
Vacuum desiccator or N2 purge box for slide storage
Vortex mixer
Sonicator machine
1 Optional. Recommended when processing arrays with a G2565CA scanner in environments in which ozone levels are 5 ppb or higher.
2 The number varies depending on if wash procedure A or B is selected.
Table 5 Optional. Recommended when using high-throughput method on 2-pack microarrays.
Description Vendor and part number
Tall Chimney PCR plate Fisher Scientific p/n 14-230-242
Table 4 Required equipment (continued)
Description Vendor and part number
12 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
1 Before You Begin Required Reagents
Required Reagents
Table 6 Required reagents for DNA Methylation sample preparation
Item Vendor and part number
PBS (Phosphate Buffered Saline) VWR p/n 97062-818
5-Methylcytidine, Monoclonal Antibody, purified Eurogentec p/n BI-MECY-1000
Dynabeads Pan Mouse IgG Thermo Fisher Scientific p/n 11041
Nuclease-free distilled water Thermo Fisher Scientific p/n 10977015
Yeast tRNA Thermo Fisher Scientific p/n 15401011
UltraPure 10% SDS Thermo Fisher Scientific p/n 15553027
Glycogen Sigma-Aldrich p/n 10901393001
Ethanol (95% to 100% molecular biology grade) Sigma-Aldrich p/n E7023-6500ML
BSA, powder Sigma-Aldrich p/n A7906
NaCl Sigma-Aldrich p/n S7653
Triton X-100 Sigma-Aldrich p/n T8787
Phenol-chloroform-isoamyl alcohol Sigma-Aldrich p/n 77617
Table 7 Required reagents for enzymatic sample prep and labeling with the SureTag DNA Labeling Kit
Description Vendor and part number
SureTag DNA Labeling Kit1
1 Kit content is listed in Reagent Kit Components on page 62.
Agilent p/n 5190-3400
1TE (pH 8.0), Molecular grade Thermo Fisher Scientific p/n AM9849
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 13
1 Before You Begin Required Hardware and Software
Required Hardware and Software
Refer to the Agilent Scanner or Feature Extraction manuals for minimum memory requirements and other specifications. Go to www.agilent.com.
Table 8 Required reagents for hybridization and wash
Description Vendor and part number
Oligo aCGH/ChIP-on-chip Wash Buffer Kit or Oligo aCGH/ChIP-on-chip Wash Buffer 1 and Oligo aCGH/ChIP-on-chip Wash Buffer 2
Agilent p/n 5188-5226 Agilent p/n 5188-5221 Agilent p/n 5188-5222
Stabilization and Drying Solution1
1 Optional components recommended if wash procedure B is selected.
Agilent p/n 5185-5979
Oligo aCGH/ChIP-on-chip Hybridization Kit Agilent p/n 5188-5220 (25) or p/n 5188-5380 (100)
Cot-1 DNA (1.0 mg/mL) Human Cot-1 DNA or Mouse Cot-1 DNA
Agilent p/n 5190-3393 Thermo Fisher Scientific p/n 18440016
DNase/RNase-free distilled water Thermo Fisher Scientific p/n 10977015
Milli-Q ultrapure water Millipore
Acetonitrile1 Sigma-Aldrich p/n 271004-1L
Deionized Formamide Sigma-Aldrich p/n F9037-100ML
14 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
2 Sample Preparation Step 1. Prepare the magnetic beads 17 Step 2. Prepare DNA for Immunoprecipitation 19 Step 3. Immunoprecipitate the methylated DNA 19 Step 4. Wash and elute methylated DNA from beads 20 Step 5. Extract immunoprecipitated and reference DNA with
phenol-chloroform 21
The steps in this protocol and the estimated amounts of time required are listed in Table 1.
Table 1 Overview and time requirements.
Step Time Requirement
Binding of antibody to magnetic beads 0.5 hour, then overnight
DNA sonication 1 hour
Methylated DNA immunoprecipitation 0.5 hour, then overnight
Wash, elution 2 hours
DNA Purification with phenol:chloroform:Isoamyl alcohol 2 hours
Cyanine 3/cyanine 5 labeling of immunoprecipitate and reference material
3 hours
Microarray hybridization 1 hour, then 40 hours
Microarray washing 1 hour
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 15
2 Sample Preparation
Figure 1. Methylated Genomic DNA overview
Hybridize to microarray
Purify and label DNA
IMMUNOPRECIPITATED SAMPLE GENOMIC DNA CONTROL
16 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
2 Sample Preparation Step 1. Prepare the magnetic beads
Step 1. Prepare the magnetic beads
The following steps to bind the antibody to the beads are to be done in a cold room or on ice. 1 Set up and label one 1.5-mL RNase-free Microfuge Tube for each
immunoprecipitation. 2 Vigorously mix bottle of Dynabeads Pan Mouse IgG in a vortex mixer to
resuspend. Dynal beads will have settled during storage. 3 Immediately add 50 L of Dynabeads Pan Mouse IgG to a 1.5-mL RNase-free
Microfuge Tube. 4 Put tubes on a magnetic separation stand, such as a DynaMag-2 Magnet. 5 Remove the supernatant with a pipette.
6 Add 750 L of Block Solution 1 and resuspend gently.
7 Gently mix the beads in Block Solution 1 for 5 minutes at 4C on a Tube rotator.
8 Remove the supernatant with a pipette and magnetic separation stand. 9 Repeat step 6 to step 8 for a second wash. 10 Spin in a centrifuge at 4C at 1500 g for 3 minutes. 11 Resuspend the beads in 230 L of Block Solution 2 (Table 3 on page 18) and
add 5 g of 5-Methylcytidine, Monoclonal Antibody, purified per immunoprecipitation.
NOTE Beads can also be processed as a batch in a 15 mL conical tube. Scale the volumes accordingly.
Table 2 Block Solution 1
Stock For 100 mL Final Concentration
PBS 100 mL 1
BSA, powder 500 mg 0.5% BSA (weight/volume)
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 17
2 Sample Preparation Step 1. Prepare the magnetic beads
The first time the antibody is used, divide the unused 5-Methylcytidine, Monoclonal Antibody, purified into 5 g aliquots and store at -80C to limit freeze/thaw cycles.
12 Place tubes on a Tube rotator at 4C for a minimum of 6 hours to bind the Antibody to the beads. You can also leave the tubes on the Tube rotator overnight.
13 The next day quick, spin to collect fluid at the bottom of the tube. Use a magnetic separation stand to collect the beads against the side of tube and remove the supernatant: a Add 750 L of Block Solution 2 to the beads. b Remove the tubes from the magnetic stand and gently resuspend beads. c Use a magnetic separation stand to collect the beads against the side of
tube and remove the supernatant with a pipette. d Repeat wash two more times.
14 Remove the last wash with a 1 mL pipette. 15 Resuspend the beads in 50 L of Block Solution 2.
The beads are now ready for the IP step.
Table 3 Block Solution 2*
* You can also make a 1:10 dilution of Block Solution 1 in PBS to create Block Solution 2. Prepare Blocking Solution fresh each time.
Stock For 100 mL Final Concentration
PBS 100 mL 1
BSA, powder 50 mg 0.05% BSA (weight/volume)
NOTE Beads for up to 6 immunoprecipitations can be combined into one 1.5 mL tube or 8 in a 2 mL tube.
NOTE If beads for multiple IPs were processed together, scale the wash volume accordingly and resuspend the washed beads in 50 L of Block Solution 2 per IP.
18 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
2 Sample Preparation Step 2. Prepare DNA for Immunoprecipitation
Step 2. Prepare DNA for Immunoprecipitation
1 For each sample, resuspend 5 g of purified genomic DNA in 250 L of PBS.
Do not use lower volumes and compensate with a whole genome amplification (WGA) as this will bias the data.
2 Sonicate the suspension with a microtip attached to sonicator. Keep samples in an ice water bath during sonication.
If you use a Branson Digital Sonifier Model 450, set output power to 57%. Sonicate 5 cycles of 5 seconds ON and 10 seconds OFF to decrease foaming.
3 Check volumes with a pipette and bring the volume of each of your samples to 250 L with PBS.
4 Transfer 50 L from each sheared sample into a new 1.5-mL RNase-free Microfuge Tube to use as the reference sample. (Store the sample at -20C until use.) With the remaining 200 L, go to the next step.
Step 3. Immunoprecipitate the methylated DNA
1 Add 50 L antibody/magnetic bead mixture from Step 1. Prepare the magnetic beads on page 17 to the 1.5-mL RNase-free Microfuge Tube that contains the 200 L of sheared genomic DNA from Step 2. Prepare DNA for Immunoprecipitation on page 19.
2 Add 250 L of 2 IP Buffer.
NOTE You may need to optimize sonication conditions. Use the lowest settings that result in sheared DNA that ranges from 200 to 1000 bp in size. Shearing varies greatly depending on quantity, volume, and equipment. Depending on the specific experiment, and using power settings as high as 70%, you can use anywhere from 3 to 8 cycles and variable ratios of time ON and time OFF. You can determine the degree with the use of the Agilent 2100 Bioanalyzer. See QC Metrics on page 66.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 19
2 Sample Preparation Step 4. Wash and elute methylated DNA from beads
3 Gently mix tubes overnight on a Tube rotator at 4C.
Step 4. Wash and elute methylated DNA from beads
Do these steps in a 4C cold room or on ice.
1 Place tubes in a magnetic separation stand to collect the beads. Remove supernatant with a pipette. Keep as many magnetic beads as you can.
2 Add 1 mL of IP Wash Buffer to each tube. 3 Remove tubes from magnetic device and shake or agitate tube gently to
resuspend beads. 4 Rotate beads for 3 minutes at 4C. 5 Replace tubes in magnetic device to collect beads. 6 Remove supernatant. Repeat this wash 2 more times.
7 Remove any residual IP Wash Buffer with a pipette.
Table 4 2 IP Buffer
Final concentration in 2X buffer
Volume
1% Triton X-100 in PBS 0.05% 200 L
Yeast tRNA 50 g/ml 8 L
PBS 3.8 mL
Total 4 mL
Table 5 IP Wash Buffer
Stock Volume
PBS 48.75 mL
1% Triton X-100 in PBS 1.25 mL
20 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
2 Sample Preparation Step 5. Extract immunoprecipitated and reference DNA with phenol-chloroform
Elution
1 Add 150 L of Elution Buffer and resuspend beads.
2 Incubate in water bath at 65C for 2.5 minutes. 3 Remove tubes and quickly mix on a vortex mixer to resuspend beads. 4 Return to 65C water bath and incubate for an additional 2.5 minutes. 5 Place tubes on magnetic separation stand. 6 Transfer 150 L of supernatant to a new labeled 1.5-mL RNase-free
Microfuge Tube.
The supernatant contains your IP DNA. Do not discard. 7 Repeat elution step 1 through step 6 with additional 150 L of Elution Buffer.
Combine the two elutions into one tube.
Step 5. Extract immunoprecipitated and reference DNA with phenol-chloroform
1 Add 250 L of elution buffer to each of your reference samples, which you set aside from Step 2. Prepare DNA for Immunoprecipitation on page 19, for a total volume of 300 L.
2 Add 300 L of Phenol-chloroform-isoamyl alcohol to each immunoprecipitate and reference tube.
3 Mix the samples on a vortex mixer for 20 seconds. 4 On a centrifuge, spin one MaXtract High Density 2-mL tube for each
immunoprecipitated and reference DNA sample at 14,000 g for 30 seconds at room temperature.
5 Transfer all 600 L of the sample to the MaXtract High Density 2-mL tube. 6 Spin the sample in a centrifuge at 14,000 g for 5 minutes at room
temperature.
Table 6 Elution Buffer
Component Volume
1TE (pH 8.0) 45 mL
10% SDS 5 mL
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 21
2 Sample Preparation Step 5. Extract immunoprecipitated and reference DNA with phenol-chloroform
If any samples remains cloudy, repeat the Phenol-chloroform-isoamyl alcohol extraction one more time.
7 Transfer the aqueous layer (top) to a new 1.5-mL RNase-free Microfuge Tube and dispose the MaXtract High Density 2-mL tube.
8 To each tube that contains the aqueous layer, add: 16 L of 5 M NaCl (200 mM final concentration) 1.5 L of 20 g/L Glycogen 880 L Ethanol
9 Mix on a vortex mixer. 10 Cool the mixture for 30 minutes at -80C. 11 Spin the mixture in a centrifuge at 20,000 g for 10 minutes at 4C to create
DNA pellets. 12 Carefully remove the supernatant and retain the pellets. 13 Wash the pellets with 500 L of 70% ice-cold Ethanol. 14 Spin the mixture in a centrifuge at 12,000 g for 3 minutes. 15 Discard the supernatant while you retain the pellets. 16 Dry the pellets for 10 minutes with a vacuum desiccator, such as a Savant
Speed Vac. 17 If you want to keep a part of this sample for more analysis, such as
quantification, resuspend the DNA in 31 L of nuclease-free water. Otherwise, resuspend in 26 L of nuclease-free water.
18 Use the Nanodrop spectrophotometer to measure the yield of the IP and reference samples using the reserved 5 L of the sample.
Yield from a typical tissue ranges from 500 to 700 ng. Hypomethylated or hypermethylated abnormal tissues can produce slightly different yields.
22 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
3 Sample Labeling Step 1. Fluorescent Labeling of DNA 24 Step 2. Purification of Labeled DNA 26 To determine yield and specific activity 27
The SureTag DNA Labeling Kit contains sufficient two-color labeling reaction reagents for 25 microarrays (25 reactions of each color).
It also contain clean-up columns for 25 reactions of each color.
The kit uses random primers and the Exo (-) Klenow fragment to differentially label IP and reference DNA samples with fluorescent-labeled nucleotides. For the Agilent DNA Methylation application, the experimental sample is labeled with one dye while the reference sample is labeled with the other dye. The polarity of the sample labeling is a matter of experimental choice. Typically, the reference sample is labeled with Cy3 and the IP is labeled with Cy5.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 23
3 Sample Labeling Step 1. Fluorescent Labeling of DNA
Step 1. Fluorescent Labeling of DNA
1 Equilibrate heat blocks or water baths to 98C, 37C and 65C, or use a thermal cycler.
2 Spin the samples in a centrifuge for 1 minute at 6,000 g to drive the contents off the walls and lid.
3 Add Random Primer: For 1-pack, 2-pack, and 4-pack microarrays, add 5 L of Random Primer to
each reaction tube containing 26 L of reference or IP DNA to make a total volume of 31 L. Mix well by pipetting up and down gently.
4 Transfer sample tubes to a circulating water bath or heat block at 98C. Incubate at 98C for 3 minutes, then move to ice and incubate on ice for 5 minutes.
or
Transfer sample tubes to a thermal cycler. Program the thermal cycler according to Table 7 and run the program.
5 Spin the samples in a centrifuge for 1 minute at 6,000 g to drive the contents off the walls and lid.
NOTE Cyanine 3-dUTP and cyanine 5-dUTP are light sensitive and are subject to degradation by multiple freeze thaw cycles. Minimize light exposure throughout the labeling procedure.
CAUTION The test/reference sample pairs must be treated identically when they are processed, or else the quality of your data can be adversely affected. The best way to ensure that the sample pairs are exposed to the same temperature during the denaturation step is to use a water bath.
Table 7 DNA denaturation using a thermal cycler
Step Temperature Time
Step 1 95 C 3 minutes
Step 2 4 C hold
24 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
3 Sample Labeling Step 1. Fluorescent Labeling of DNA
6 Prepare Labeling Master Mix: a Mix the components in Table 8 on ice in the order indicated to prepare one
cyanine-3 and one cyanine-5 Labeling Master Mix.
b Add 19 L of Labeling Master Mix to each reaction tube containing the reference or IP DNA to make a total volume of 50 L. Mix well by gently pipetting up and down.
7 Incubate the samples: a Transfer sample tubes to a circulating water bath or heat block at 37C.
Incubate at 37C for 2 hours. b Transfer sample tubes to a circulating water bath or heat block at 65C.
Incubate at 65C for 10 minutes to inactivate the enzyme. c Move the sample tubes to ice.
or
Transfer sample tubes to a thermal cycler. Program the thermal cycler according to Table 9 and run the program.
Reactions can be stored up to a month at -20C in the dark.
Table 8 Labeling Master Mix (for 1-pack, 2-pack and 4-pack microarrays)
Component Per reaction (L)
8 rxns (L) (including excess)
24 rxns (L) (including excess)
48 rxns (L) (including excess)
5 Reaction Buffer 10.0 85 250 500
10 dNTPs 5.0 42.5 125 250
Cyanine 3-dUTP or Cyanine 5-dUTP
3.0 25.5 75 150
Exo (-) Klenow 1.0 8.5 25 50
Final volume of Labeling Master Mix
19.0 161.5 475 950
Table 9 DNA labeling using a thermal cycler
Step Temperature Time
Step 1 37C 2 hours
Step 2 65C 10 minutes
Step 3 4C hold
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 25
3 Sample Labeling Step 2. Purification of Labeled DNA
Step 2. Purification of Labeled DNA
Labeled DNA is purified using the reaction Purification Column provided with the SureTag DNA Labeling Kit. The Purification Column includes:
column 2-mL collection tube
1 Spin the labeled reference or IP DNA samples in a centrifuge for 1 minute at 6,000 g to drive the contents off the walls and lid.
2 Add 430 L of 1TE (pH 8.0) to each reaction tube. 3 For each reference or IP DNA sample to be purified, place a column into a
2-mL collection tube and label the column appropriately. Load each labeled reference or IP DNA onto a column.
4 Cover the column with a cap and spin for 10 minutes at 14,000 g in a microcentrifuge at room temperature. Discard the flow-through and place the column back in the 2-mL collection tube.
5 Add 480 L of 1TE (pH 8.0) to each column. Spin for 10 minutes at 14,000 g in a microcentrifuge at room temperature. Discard the flow-through.
6 Invert the column into a fresh 2-mL collection tube that has been appropriately labeled. Spin for 1 minute at 1,000 g in a microcentrifuge at room temperature to collect purified sample.
7 Add 1TE (pH 8.0), or use a concentrator to bring the sample volume to that listed in Table 10. Do not excessively dry the DNA because the pellets will become difficult to resuspend.
8 Mix thoroughly. If the sample has dried or precipitated after concentration, incubate the tube that contains DNA sample on ice for 5 minutes, and then pipette the solution up and down 10 times.
9 Take 1.5 L of each sample to determine yield and specific activity. See To determine yield and specific activity on page 27. Refer to Table 11 on page 28 for expected yield of labeled DNA and specific activity after labeling and clean-up.
10 In a fresh 1.5-mL RNase-free Microfuge Tube or 200-L Thin-Wall Tube, combine test and reference sample using the appropriate cyanine-5-labeled
NOTE Keep cyanine-3 and cyanine-5 labeled DNA samples separated throughout this clean-up step.
26 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
3 Sample Labeling To determine yield and specific activity
sample and cyanine-3-labeled sample for a total mixture volume listed in Table 10. Use the appropriate container listed in Table 10.
Labeled DNA can be stored up to one month at -20C in the dark.
To determine yield and specific activity
Use the NanoDrop 8000 or 2000 UV-VIS Spectrophotometer to measure yield and specific activity.
1 From the main menu, select MicroArray Measurement, then from the Sample Type menu, select DNA-50.
2 Use 1.5 L of 1TE (pH 8.0) to blank the instrument. 3 Use 1.5 L of purified labeled DNA for quantitation. Measure the absorbance
at A260nm (DNA), A550nm (cyanine 3), and A650nm (cyanine 5). 4 Calculate the Specific Activity of the labeled DNA:
*pmol dyes per g DNA
The Specific Activity is Degree of Labeling divided by 0.034. 5 Record the DNA concentration (ng/L) for each sample. Calculate the yield as
Table 10 Sample volume and total mixture volumes
Microarray Cy3 or Cy5 sample volume after purification
Total mixture volume after Nanodrop and combining
Container
1-pack 42 L 80 L 1.5-mL RNase-free Microfuge Tube
2-pack 22 L 40 L 1.5-mL RNase-free Microfuge Tube or Tall Chimney PCR plate
4-pack 13.25 L 22.5 L 1.5-mL RNase-free Microfuge Tube or Tall Chimney PCR plate
Specific Activity* = pmol per L of dye g per L DNA-------------------------------------------------------
Yield (g) DNA Concentration (ng/L) Sample Volume (L) 1000 ng/g-----------------------------------------------------------------------------------------------------------------------------------------------------=
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 27
3 Sample Labeling To determine yield and specific activity
Refer to Table 11 for expected yield of labeled DNA and specific activity after labeling and purification.
The cyanine 3 and cyanine 5 yield after labeling should be the same.
Table 11 Expected Yield and Specific Activity after Labeling and Purification
Yield (g) Specific activity of cyanine 3 labeled sample (pmol/g)
Specific activity of cyanine 5 labeled sample (pmol/g)
> 2.5 18 to 25 7 to 20
28 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Microarray Hybridization 30 Microarray Wash 42 Microarray Scanning and Feature Extraction 54
Microarray processing consists of hybridization, washing, and scanning.
Feature Extraction is the process by which data is extracted from the scanned microarray image (.tif) and translated into log ratios, allowing researchers to measure DNA copy number changes in their experiments in conjunction with Agilent Genomic Workbench Software.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 29
4 Microarray Processing and Feature Extraction Microarray Hybridization
Microarray Hybridization
Before you begin, make sure you read and understand Secure Fit Slide Box Opening Instructions on page 63 and Microarray Handling Tips on page 65.
To practice hybridization, prepare a 1:1 2 HI-RPM Hybridization Buffer and water mix and use a microscope slide or used microarray slide, and a gasket slide. You can use the same slide to practice wash and placement of slide in the slide holder.
Step 1. Prepare the 10 Blocking Agent
1 Add 1,350 L of DNase/RNase-free distilled water to the vial containing lyophilized 10 aCGH Blocking Agent (included in the Oligo aCGH/ChIP-on-chip Hybridization Kit).
2 Leave at room temperature for 60 minutes and mix on a vortex mixer to reconstitute sample before use or storage.
Step 2. Prepare labeled DNA for hybridization
1 Equilibrate water baths or heat blocks to 95C and 37C or use a thermal cycler.
2 Mix the components according to the microarray format to prepare the Hybridization Master Mix. Refer to Table 12 through Table 14.
NOTE Reconstituted 10 Blocking Agent is stable for 120 days when stored at -20C and can be frozen and thawed up to three times.
30 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 2. Prepare labeled DNA for hybridization
Table 12 Hybridization Master Mix for 1-pack microarray
Component Volume (L) per hybridization
8 rxns (L) (including excess)
24 rxns (L) (including excess)
48 rxns (L) (including excess)
Cot-1 DNA (1.0 mg/mL)*
* Use Cot-1 DNA (1.0 mg/mL) from the appropriate species.
50 425 1,250 2,500
10 aCGH Blocking Agent
Included in the Oligo aCGH/ChIP-on-chip Hybridization Kit
52 442 1,300 2,600
2 HI-RPM Hybridization Buffer 260 2,210 6,500 13,000
Deionized Formamide 78 663 1950 3900
Final Volume of Hybridization Master Mix
440 3,740 11,000 22,000
Table 13 Hybridization Master Mix for 2-pack microarray
Component Volume (L) per hybridization
8 rxns (L) (including excess)
24 rxns (L) (including excess)
48 rxns (L) (including excess)
Cot-1 DNA (1.0 mg/mL)*
* Use Cot-1 DNA (1.0 mg/mL) from the appropriate species.
25 212.5 625 1,250
10 aCGH Blocking Agent
Included in the Oligo aCGH/ChIP-on-chip Hybridization Kit
26 221 650 1,300
2 HI-RPM Hybridization Buffer 130 1,105 3,250 6,500
Deionized Formamide 39 331.5 975 1950
Final Volume of Hybridization Master Mix
220 1,870 5,500 11,000
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 31
4 Microarray Processing and Feature Extraction Step 2. Prepare labeled DNA for hybridization
3 Add the appropriate volume of the Hybridization Master Mix to the 1.5-mL RNase-free Microfuge TubeTall Chimney PCR plate well that contains the labeled reference or IP DNA to make the total volume listed in Table 15.
4 Mix the sample by pipetting up and down, then quickly spin in a centrifuge to drive contents to the bottom of the reaction tube.
5 Transfer sample tubes to a circulating water bath or heat block at 95C. Incubate at 95C for 3 minutes, then immediately transfer sample tubes to a circulating water bath or heat block at 37C. Incubate at 37C for 30 minutes.
or
Transfer sample tubes to a thermal cycler. Program the thermal cycler according to the following table and run the program:
Table 14 Hybridization Master Mix for 4-pack microarray
Component Volume (L) per hybridization
8 rxns (L) (including excess)
24 rxns (L) (including excess)
48 rxns (L) (including excess)
Cot-1 DNA (1.0 mg/mL)*
* Use Cot-1 DNA (1.0 mg/mL) from the appropriate species.
5 42.5 125 250
10 aCGH Blocking Agent
Included in the Oligo aCGH/ChIP-on-chip Hybridization Kit
11 93.5 275 550
2 HI-RPM Hybridization Buffer 55 467.5 1,375 2,750
Deionized Formamide 16.5 140.25 412.25 824.5
Final Volume of Hybridization Master Mix
87.5 743.75 2187.25 4374.5
Table 15 Volume of Hybridization Master Mix per hybridization
Microarray format Volume of Hybridization Master Mix
Total volume
1-pack 440 L 520 L
2-pack 220 L 260 L
4-pack 87.5 L 110 L
32 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 2. Prepare labeled DNA for hybridization
6 Remove sample tubes from the water bath, heat block, or thermal cycler. Spin 1 minute at 6000 g in a centrifuge to collect the sample at the bottom of the tube.
The samples are ready to be hybridized.
Table 16 Thermal cycler program
Step Temperature Time
Step 1 95C 3 minutes exactly
Step 2 37C 30 minutes
CAUTION The samples must be hybridized immediately. If not, keep the temperature of hybridization sample mixtures as close to 37C as possible on a heat block, thermal cycler or in an oven.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 33
4 Microarray Processing and Feature Extraction Step 3. Prepare the hybridization assembly
Step 3. Prepare the hybridization assembly
Refer to the Agilent Microarray Hybridization Chamber User Guide (publication G2534-90004) for in-depth instructions on how to load samples, assemble and disassemble chambers, as well as other helpful tips. This user guide can be downloaded from the Agilent Web site at www.agilent.com.
Before you begin, make sure you read and understand Secure Fit Slide Box Opening Instructions on page 63 and Microarray Handling Tips on page 65.
Remove gasket slide from its packaging
1 With tweezers, carefully lift up the corner of the clear plastic covering and slowly pull back the protective film.
Figure 2. Removal of clear plastic covering
1 With clean, powder-free gloved fingers, remove the gasket slide from its package. Handle the slide only on its edges.
To avoid any potential contamination from surrounding surface materials, immediately insert the gasket slide in the chamber base using the instructions below.
NOTE Do not remove gasket slide from protective sleeve until ready for use. Do not slice or cut open the gasket slide protective packaging. Handle only the edges of the gasket slide. Prior to use, inspect gasket slides for visible gaps or cuts through the gaskets
or any debris within the hybridization areas as these are indications of instability. Do not use gasket slides that have these features.
34 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 3. Prepare the hybridization assembly
Insert the gasket slide into the chamber base
1 Hold the gasket slide so that the barcode label is facing towards you. This side of the slide is the gasket side.
Figure 3. Gasket slide, gasket side
1 Locate the four chamber base guideposts and rectangular barcode guide in the chamber base.
2 Position the gasket slide between the 4 chamber base guide posts (see Figure 4) with the barcode label resting over the bases rectangular barcode guide.
Figure 4. Chamber base, guide posts denoted with arrows
3 Gently place the gasket slide into the chamber base.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 35
4 Microarray Processing and Feature Extraction Step 3. Prepare the hybridization assembly
4 Make sure the gasket slide rests flush against the chamber base. Re-adjust to a flush position against the chamber base if needed.
Figure 5. Correct positioning of gasket slide in chamber base
Load the sample
1 Slowly dispense the appropriate volume of hybridization sample mixture onto the gasket well in a drag and dispense manner (described below). For multi-pack microarray formats (2-pack or 4-pack microarray), load all gasket wells before you add the microarray slide. 490 L (for 1-pack microarray) 245 L (for 2-pack microarray) 100 L (for 4-pack microarray)
The drag and dispense method helps to distribute the sample evenly across the surface of the well and avoids spillover of sample over the gasket edge. Start with the pipette tip near the top edge of the well. Do not directly touch the gasket or the glass with the pipette tip. Then, dispense the mixture while you move your pipette tip to the opposite end of the well so that the sample is distributed across the well space. Avoid creating large air bubbles as you dispense the mixture as they could lead to spillover.
Figure 6. Drag and dispense method Start dispensing when the pipette tip is near the top of the well. Finish dispensing when the pipette tip is near the bottom of the well.
Slide and gasket are flush
36 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 3. Prepare the hybridization assembly
Add the microarray slide
1 Remove a microarray slide from the slide storage box between your thumb and index finger, numeric barcode side facing up and Agilent label facing down.
2 Use the four chamber base guideposts and rectangular end of the base to position the microarray slide as you lower it to within 3 mm (1/8) above the gasket slide, making sure the microarray slide is not tilted with respect to the gasket slide. Barcode ends of both the gasket slide and the microarray slide must line up at the corners of the chamber base. Once positioned, gently rest the microarray slide on the lower gasket slide. Refer to Figure 7 for proper technique on holding the microarray slide with both hands.
Figure 7. Chamber base with gasket and microarray slide applied, guide posts denoted with arrows
CAUTION Keep the temperature of hybridization sample mixtures as close to 37C as possible. To do this, process them in small batches and/or put them on a heat block, thermal cycler or in an oven.
CAUTION Do not drop the microarray slide onto the gasket slide as this increases the chances of sample mixing between gasket wells.
Once placed, do not attempt to move the chamber and sandwiched slides as this can cause leakage of the hybridization solution.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 37
4 Microarray Processing and Feature Extraction Step 3. Prepare the hybridization assembly
Assemble the chamber
1 Place the chamber cover, correct side facing up, onto the chamber base which contains the sandwiched slides.
Figure 8. Chamber cover in correct (left) and incorrect (right) orientations
2 From the rounded corner of the chamber base, slip the clamp onto the chamber base and cover until it stops firmly in place, resting at the center of the two pieces.
Keep the chamber assembly flat on the lab bench to avoid spilling the hybridization solution.
Figure 9. Slipping the clamp onto the chamber base
3 Firmly tighten the thumbscrew fully.
The slides will not be harmed by hand-tightening.
Correct Wrong
38 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 3. Prepare the hybridization assembly
Figure 10. Tightening of the thumbscrew on the clamp
4 Rotate the final assembled chamber in a vertical orientation, clockwise, 2 to 3 times to wet the gaskets (see Figure 11).
Rotation helps ensure that the hybridization solution will coat the entire surface of the microarray during the incubation process.
Figure 11. Rotation of the final assembled chamber
5 Inspect for good bubble formation. Hold the chamber vertically and inspect for stray or small bubbles that do
not move as you rotate the chamber. Use the large mixing bubble to dislodge small stray or stationary bubbles. If the small stray or stationary bubbles persist, gently tap the assembled
chamber on a firm surface. Rotate the chamber on its sides as you tap. Inspect again and repeat if needed until the small stray or stationary bubbles dissipate.
CAUTION If you do not completely tighten the thumbscrew, hybridization solution can leak out during hybridization.
Do not use tools to tighten the thumbscrew. The use of pliers or other tools can damage the parts and will void the warranty.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 39
4 Microarray Processing and Feature Extraction Step 4. Hybridize
Figure 12. The slide on the left shows a stray, stationary bubble (denoted with arrow), which must be removed before hybridization. The slide on the right shows only large mixing bubbles, which move freely around the chamber when rotated. Bubbles are acceptable, as long as they move freely when you rotate the chamber.
Step 4. Hybridize
1 Load the assembled chamber into the oven rotator rack, starting from the center of the rack (position 3 or 4 when counting from left to right). Refer to the figure below for correct and incorrect orientations.
Figure 13. Assembled chambers in correct (left) and incorrect (middle and right) orientations
2 Close the door and set the rotator speed to 20 rpm. 3 Hybridize at 67C for:
24 hours (4-pack microarrays) 40 hours (1-pack and 2-pack microarrays)
Wrong Correct
CAUTION If you are not loading all the available positions on the hybridization rotator rack, be sure to balance the loaded hybridization chambers on the rack similar to a centrifuge to prevent unnecessary strain on the oven motor.
40 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 4. Hybridize
CAUTION You must calibrate the hybridization oven regularly for accuracy of the collected data. Refer to Agilent G2545A Hybridization Calibration Procedure (publication G2545-90002) for more information.
NOTE The Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 that is used in the microarray wash procedure needs to be warmed overnight. While you are waiting for the microarray slides to hybridize, do the steps in Step 1. Prewarm Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 (overnight) on page 43.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 41
4 Microarray Processing and Feature Extraction Microarray Wash
Microarray Wash
Before you begin, determine which wash procedure to use:
Always use clean equipment when conducting the wash procedures. Use only dishes that are designated and dedicated for use in Agilent
Methylation experiments.
NOTE The microarray wash procedure must be done in environments where ozone levels are 5 ppb or less. For Scanner C and Scanner B, if ozone levels are between 5 to 10 ppb in your laboratory, use the Agilent Ozone Barrier Slide Cover. SureScan microarray scanner uses a slide holder with a built-in ozone barrier. If ozone levels exceed 10 ppb, use the Stabilization and Drying Solution together with the ozone barrier.
You can also use Carbon Loaded Non-woven Filters to remove ozone from the air. These filters can be installed in either your HVAC system, or as part of small Ozone Controlled Enclosures. These free-standing enclosures can be installed either on a lab bench or as a walk-in room within your lab. These products are available through filter suppliers.
Table 17 Wash procedure to follow
Ozone level in your lab
Wash Procedure Ozone-Barrier Slide Cover
< 5 ppb Wash Procedure A (without Stabilization and Drying Solution) on page 45
No
> 5 ppb < 10 ppb Wash Procedure A (without Stabilization and Drying Solution) on page 45
Yes
> 10 ppb Wash Procedure B (with Stabilization and Drying Solution) on page 49
Yes
CAUTION Do not use detergent to wash the staining dishes as some detergents may leave fluorescent residue on the dishes. If you do, you must ensure that all traces are removed by thoroughly rinsing with Milli-Q ultrapure water.
42 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 1. Prewarm Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 (overnight)
Step 1. Prewarm Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 (overnight)
The temperature of Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 must be at 37C for optimal performance. 1 Add the volume of buffer required to a Sterile storage bottle and warm
overnight in an incubator or circulating water bath set to 37C. 2 Put a slide-staining dish with a lid, a 1.5 L glass dish, and one to two liters of
Milli-Q ultrapure water in an incubator or water bath set at 37C to warm overnight.
Step 2. Wash with Milli-Q ultrapure water
Rinse slide-staining dishes, slide racks and stir bars thoroughly with high-quality Milli-Q ultrapure water before use and in between washing groups. 1 Run copious amounts of Milli-Q ultrapure water through the slide-staining
dishes, slide racks and stir bars. 2 Empty out the water collected in the dishes at least five times. 3 Repeat step 1 and step 2 until all traces of contaminating material are
removed.
Step 3. Clean with Acetonitrile (Wash Procedure B Only)
Acetonitrile wash removes any remaining residue of Stabilization and Drying Solution from slide-staining dishes, slide racks and stir bars that were used in previous experiments with Wash Procedure B (with Stabilization and Drying Solution) on page 49.
WARNING Do Acetonitrile washes in a vented fume hood. Acetonitrile is highly flammable and toxic.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 43
4 Microarray Processing and Feature Extraction Step 4. Prewarm Stabilization and Drying Solution (Wash Procedure B Only)
1 Add the slide rack and stir bar to the slide-staining dish, and transfer to a magnetic stir plate.
2 Fill the slide-staining dish with 100% Acetonitrile. 3 Turn on the magnetic stir plate and adjust the speed to a setting of 4 (medium
speed). 4 Wash for 5 minutes at room temperature. 5 Discard the Acetonitrile as is appropriate for your site. 6 Repeat step 1 through step 5. 7 Air dry everything in the vented fume hood. 8 Continue with the Milli-Q ultrapure water wash as previously instructed.
Step 4. Prewarm Stabilization and Drying Solution (Wash Procedure B Only)
The Stabilization and Drying Solution contains an ozone scavenging compound dissolved in Acetonitrile. The compound in solution is present in saturating amounts and may precipitate from the solution under normal storage conditions. If the solution shows visible precipitation, warming of the solution will be necessary to redissolve the compound. Washing slides using Stabilization and Drying Solution showing visible precipitation will have profound adverse affects on microarray performance.
WARNING The Stabilization and Drying Solution is a flammable liquid. Warming the solution will increase the generation of ignitable vapors. Use gloves and eye/face protection in every step of the warming procedures.
WARNING Do not use a hot plate, oven, an open flame or a microwave. Do not increase temperature rapidly. Warm and mix the material away from ignition sources.
WARNING Failure to follow the outlined process will increase the potential for fire, explosion, and possible personal injury.
44 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 5. Wash microarrays
1 Put a clean magnetic stir bar into the Stabilization and Drying Solution bottle and recap.
2 Partially fill a plastic bucket with hot water at approximately 40C to 45C (for example from a hot water tap).
3 Put the Stabilization and Drying Solution bottle into the hot water in the plastic bucket.
4 Put the plastic bucket on a magnetic stirrer (not a hot-plate) and stir. 5 The hot water cools to room temperature. If the precipitate has not all
dissolved replenish the cold water with hot water. 6 Repeat step 5 until the solution is clear. 7 After the precipitate is completely dissolved, allow the solution to equilibrate
to room temperature prior to use.
Step 5. Wash microarrays
Wash Procedure A (without Stabilization and Drying Solution)
Always use fresh Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1 and Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 for each wash group (up to five slides).
Table 18 lists the wash conditions for the Wash Procedure A without Stabilization and Drying Solution.
CAUTION Do not filter the Stabilization and Drying Solution, or the concentration of the ozone scavenger may vary.
Table 18 Wash conditions
Dish Wash buffer Temperature Time
Disassembly #1 Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1
Room temperature
1st wash #2 Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1
Room temperature 5 minutes
2nd wash #3 Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2
37C 1 minute
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 45
4 Microarray Processing and Feature Extraction Step 5. Wash microarrays
1 Completely fill slide-staining dish #1 with Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1 at room temperature.
2 Prepare dish #2: a Put a slide rack into slide-staining dish #2. b Add a magnetic stir bar. Fill slide-staining dish #2 with enough Agilent
Oligo aCGH/ChIP-on-Chip Wash Buffer 1 at room temperature to cover the slide rack.
c Put this dish on a magnetic stir plate. 3 Prepare dish #3:
a Put the prewarmed 1.5 L glass dish on a magnetic stir plate with heating element.
b Put the slide-staining dish #3 into the 1.5 L glass dish. c Fill the 1.5 L glass dish with pre-warmed Milli-Q ultrapure water. d Fill the slide-staining dish #3 approximately three-fourths full with Agilent
Oligo aCGH/ChIP-on-Chip Wash Buffer 2 (warmed to 37C). e Add a magnetic stir bar. f Turn on the heating element and maintain temperature of Agilent Oligo
aCGH/ChIP-on-Chip Wash Buffer 2 at 37C. Monitor with a thermometer. 4 Remove one hybridization chamber from the incubator and resume rotation
of the others. Record whether bubbles formed during hybridization and if all bubbles are rotating freely.
5 Prepare the hybridization chamber disassembly. a Put the hybridization chamber assembly on a flat surface and loosen the
thumbscrew, turning counter-clockwise.
Figure 14. Loosening of the thumbscrew
b Slide off the clamp assembly and remove the chamber cover.
46 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 5. Wash microarrays
Figure 15. Removal of the clamp
c With gloved fingers, remove the microarray-gasket sandwich from the chamber base by lifting one end and then grasping in the middle of the long sides. Keep the microarray slide numeric barcode facing up as you quickly transfer the sandwich to slide-staining dish #1.
d Without letting go of the slides, submerge the microarray-gasket sandwich into slide-staining dish #1 containing Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1.
6 With the sandwich completely submerged in Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1, pry the sandwich open from the barcode end only: a Slip one of the blunt ends of the forceps between the slides. b Gently twist the forceps to separate the slides. c Let the gasket slide drop to the bottom of the staining dish. d Remove the microarray slide, grasp it from the upper corners with thumb
and forefinger, and quickly put into slide rack in the slide-staining dish #2 containing Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1 at room temperature. Minimize exposure of the slide to air. Touch only the barcode portion of the microarray slide or its edges!
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 47
4 Microarray Processing and Feature Extraction Step 5. Wash microarrays
\
Figure 16. Removal of the microarray slide from the staining dish
7 Repeat step 4 through step 6 for up to four additional slides in the group. A maximum of five disassembly procedures yielding five microarray slides is advised at one time in order to facilitate uniform washing.
8 When all slides in the group are put into the slide rack in slide-staining dish #2, stir at 350 rpm for 5 minutes. Adjust the setting to get good but not vigorous mixing.
9 Wash the slides in Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2: a Transfer slide rack to slide-staining dish #3, which contains Agilent Oligo
aCGH/ChIP-on-Chip Wash Buffer 2 at 37C: a Activate the magnetic stirrer. b Wash microarray slides for at least 1 minute and no more than 2 minutes.
Adjust the setting to get thorough mixing without disturbing the microarray slides.
10 Slowly remove the slide rack trying to minimize droplets on the slides. It should take 5 to 10 seconds to remove the slide rack.
11 Discard used Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1 and Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2.
12 Repeat step 1 through step 11 for the next group of five slides using fresh Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1 and Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 warmed to 37C.
48 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 5. Wash microarrays
13 Scan slides immediately to minimize the impact of environmental oxidants on signal intensities. If necessary, store slides in orange slide boxes in a N2 purge box, in the dark.
Wash Procedure B (with Stabilization and Drying Solution)
Cyanine reagents are susceptible to degradation by ozone. Use this wash procedure if the ozone level exceeds 10 ppb in your laboratory.
Always use fresh Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1 and Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 for each wash group (up to five slides).
The Acetonitrile (dish #4) and Stabilization and Drying Solution (dish #5) below may be reused for washing up to 4 batches of 5 slides (total 20 slides) in one experiment. Do not pour the Stabilization and Drying Solution back in the bottle.
Table 19 lists the wash conditions for the Wash Procedure B with Stabilization and Drying Solution.
WARNING The Stabilization and Drying Solution must be set-up in a fume hood. Put the Wash Buffer 1 and Wash Buffer 2 set-up areas close to, or preferably in, the same fume hood. Use gloves and eye/face protection in every step of the washing procedure.
Table 19 Wash conditions
Dish Wash Buffer Temperature Time
Disassembly #1 Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1
Room temperature
1st wash #2 Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1
Room temperature 5 minutes
2nd wash #3 Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2
37C 1 minute
Acetonitrile wash #4 Acetonitrile Room temperature 10 seconds
3rd wash #5 Stabilization and Drying Solution Room temperature 30 seconds
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 49
4 Microarray Processing and Feature Extraction Step 5. Wash microarrays
1 In the fume hood, fill slide-staining dish #4 approximately three-fourths full with Acetonitrile. Add a magnetic stir bar and put this dish on a magnetic stir plate.
2 In the fume hood, fill slide-staining dish #5 approximately three-fourths full with Stabilization and Drying Solution. Add a magnetic stir bar and put this dish on a magnetic stir plate.
3 Do step 1 through step 9 in Wash Procedure A (without Stabilization and Drying Solution) on page 45.
4 Remove the slide rack from Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 and tilt the rack slightly to minimize wash buffer carry-over. Quickly transfer the slide rack to slide-staining dish #4 containing Acetonitrile, and stir at 350 rpm for 10 seconds.
5 Transfer slide rack to slide-staining dish #5 filled with Stabilization and Drying Solution, and stir at 350 rpm for 30 seconds.
6 Slowly remove the slide rack trying to minimize droplets on the slides. It should take 5 to 10 seconds to remove the slide rack.
7 Discard used Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1 and Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2.
8 Repeat step 1 through step 7 for the next group of five slides using fresh Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1 and Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2 prewarmed to 37C.
9 Dispose of Acetonitrile and Stabilization and Drying Solution as flammable solvents.
NOTE The Acetonitrile and the Stabilization and Drying Solution may be reused for washing of up to four batches of five slides (that is, total 20 microarray slides) in one experiment. Pour the Stabilization and Drying Solution to a different marked bottle, and protect from light with other flammables. After each use, rinse the slide rack and the slide-staining dish that were in contact with the Stabilization and Drying Solution with Acetonitrile followed by a rinse in Milli-Q ultrapure water.
50 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 6. Put slides in a slide holder
Step 6. Put slides in a slide holder
Scan slides immediately to minimize impact of environmental oxidants on signal intensities. If necessary, store slides in the original slide boxes in a N2 purge box, in the dark.
For SureScan microarray scanner
1 Before you insert the slide into a slide holder, inspect the slide holder for any dust or fingerprints. If found, remove the dust or fingerprints with compressed air or a soft, dust-free cloth. If the slide holder is scratched, worn, or damaged, has a lid that does not close tightly, or has a hinge that does not move freely, discard the slide holder and select a different one.
2 Place the slide holder on a flat surface, with the clear cover facing up, and the tab on the right. This helps to ensure that you have the slide aligned properly when you insert it into the slide holder.
3 Gently push in and pull up on the tabbed end of the clear plastic cover to open the slide holder.
Figure 17. Opening the slide holder
4 Insert the slide into the holder. a Hold the slide at the barcode end and position the slide over the open slide
holder. Make sure that the active microarray surface faces up with the barcode on the left, as shown in Figure 18.
b Carefully place the end of the slide without the barcode label onto the slide ledge. See Figure 18.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 51
4 Microarray Processing and Feature Extraction Step 6. Put slides in a slide holder
Figure 18. Inserting slide into the slide holder
c Gently lower the slide into the slide holder. See Figure 19. d Close the plastic slide cover, pushing on the tab end until you hear it click.
This moves the slide into position in the holder.
e Gently push in and pull up on the tabbed end of the clear plastic cover to open it again and verify that the slide is correctly positioned.
f Close the plastic slide cover, gently pushing on the tab end until you hear it click. See Figure 20. Make sure that the slide holder is completely closed.
Figure 19. Slide inserted in slide holder cover open
Slide ledge
CAUTION An improperly inserted slide can damage the scanner.
52 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 6. Put slides in a slide holder
Figure 20. Slide inserted in slide holder cover closed
For Agilent Scanner C
In environments in which the ozone level exceeds 5 ppb, immediately put the slides with active microarray surface (Agilent-labeled barcode) facing up in a slide holder. Make sure that the slide is not caught up on any corner. Put an ozone-barrier slide cover on top of the array as shown in Figure 21. Refer to the Agilent Ozone-Barrier Slide Cover User Guide (publication G2505-90550), included with the slide cover, for more information.
Figure 21. Inserting the ozone-barrier slide cover
In environments in which the ozone level is below 5 ppb, put the slides with Agilent barcode facing up in a slide holder.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 53
4 Microarray Processing and Feature Extraction Microarray Scanning and Feature Extraction
Microarray Scanning and Feature Extraction
Step 1. Scan the microarray slides
A SureScan or Agilent C microarray scanner is required for G3 microarrays.
Agilent provides support for Agilent microarrays scanned on select non-Agilent scanners. Please see Feature Extraction Compatibility Matrix for Non Agilent scanners for scanner compatibility and settings (www.agilent.com/cs/library/usermanuals/Public/G1662-90043_ScannerCom patibilityMatrix.pdf).
However, Agilent can guarantee the quality of data only if the data comes from Agilent microarrays scanned on Agilent scanners.
Agilent SureScan Microarray Scanner
1 Put assembled slide holders into the scanner cassette. Refer to Figure 22 and Figure 23.
Figure 22. Slide holder helps you to insert slides correctly
Finger-hold Arrow helps identify scanner orientation
54 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 1. Scan the microarray slides
Figure 23. Inserting slide holder into cassette
2 Select Protocol AgilentG3_CGH for G3 microarrays. Select Protocol AgilentHD_CGH for HD microarrays.
3 Verify that the Scanner status in the main window says Scanner Ready. 4 Click Start Scan.
Agilent C Scanner Settings
1 Put assembled slide holders with or without the ozone-barrier slide cover into scanner carousel.
2 Select Start Slot m End Slot n where the letter m represents the Start slot where the first slide is located and the letter n represents the End slot where the last slide is located.
3 Select Profile AgilentG3_CGH for G3 microarrays. Select Profile AgilentHD_CGH for HD microarrays.
4 Verify scan settings. See Table 20.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 55
4 Microarray Processing and Feature Extraction Step 2. Extract data using the Feature Extraction program
5 Check that Output Path Browse is set for desired location. 6 Verify that the Scanner status in the main window says Scanner Ready. 7 Click Scan Slot m-n on the Scan Control main window where the letter m
represents the Start slot where the first slide is located and the letter n represents the End slot where the last slide is located.
Step 2. Extract data using the Feature Extraction program
The Feature Extraction software v10.5 or higher supports extraction of microarray TIFF images (.tif) of Agilent Methylation microarrays scanned on the Agilent SureScan or C Scanner.
The Feature Extraction software v9.5 supports extraction of microarray TIFF images (.tif) of Agilent Methylation microarrays scanned on the Agilent B Scanner.
Feature Extraction version 10.7 or higher can automatically download Grid Templates, protocols and QC metrics (QCMT) from SureDesign if configured appropriately. See Automatic Download from SureDesign on page 60 for configuration.
Figure 24 shows an example of an Agilent SurePrint G3 11M microarray image opened in the Feature Extraction software.
Table 20 C Scanner Scan Settings
For HD Microarray Formats For G3 Microarray Formats
Dye channel R+G (red and green) R+G (red and green)
Scan region Agilent HD (61 x 21.6 mm) Agilent HD (61 x 21.6 mm)
Scan resolution 5 m 3 m
Tiff file dynamic range 16 bit 16 bit
Red PMT gain 100% 100%
Green PMT gain 100% 100%
XDR
56 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 2. Extract data using the Feature Extraction program
Figure 24. Agilent SurePrint G3 11M microarray shown in red and green channels, full and zoomed view
1 Open the Agilent Feature Extraction program. 2 Add the images (.tif) to be extracted to the Feature Extraction Project.
a Click Add New Extraction Set(s) icon on the toolbar or right-click the Project Explorer and select Add Extraction...
You can also drag the image (.tif) from the desktop to the Feature Extraction project pane.
b Browse to the location of the .tif files, select the .tif file(s) and click Open. To select multiple files, use the Shift or Ctrl key when selecting.
The Feature Extraction program automatically assigns a default grid template and protocol for each extraction set, if the following conditions are met:
As of v10.5, the Feature Extraction program automatically associates the protocol for a given microarray based on the application specified in the design file and the number of channels present in the image. If you need to use a protocol other than the Agilent default protocol, specify it in the Grid Template properties.
For auto assignment of the ChIP Feature Extraction protocol, the default ChIP protocol must be specified in the Feature Extraction Grid Template properties.
To access the Feature Extraction Grid Template properties, double-click on the grid template in the Grid Template Browser.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 57
4 Microarray Processing and Feature Extraction Step 2. Extract data using the Feature Extraction program
3 Set Feature Extraction Project Properties. a Select the Project Properties tab. b In the General section, enter your name in the Operator field. c In all other sections, verify that at least the following default settings as
shown in Figure 25 below are selected. d For Feature Extraction 9.5, in the Other section, select CGH_QCMT_Feb08.
For Feature Extraction 10.5 or higher, the metric sets are part of the protocol, and there is no need to set them.
QC metrics updates are available automatically from SureDesign if configured appropriately. See Automatic Download from SureDesign on page 60 for configuration.
Figure 25. Default settings in Feature Extraction 10.5
4 Check the Extraction Set Configuration. a Select the Extraction Set Configuration tab. b Verify that the correct grid template is assigned to each extraction set in
the Grid Name column. To assign a different grid template to an extraction set, select one from the pull down menu.
58 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
4 Microarray Processing and Feature Extraction Step 2. Extract data using the Feature Extraction program
If a grid template is not available to select from the pull down menu, you must add it to the Grid Template Browser. To add, right-click inside the Grid Template Browser, select Add. Look for the design file (.xml) and click Open to load grid template into the Feature Extraction database.
To update to the latest grid templates via Online Update, right-click Grid Template Browser and select Online Update. You can also download the latest grid templates from Agilent Web site at www.agilent.com/genomics/SureDesign. After downloading, add the grid template to the Grid Template Browser.
c Verify that the most recent protocol is assigned to each extraction set in the Protocol Name column.
If a protocol is not available to select from the pull down menu, you must import it to the Feature Extraction Protocol Browser. To import, right-click the Feature Extraction Protocol Browser, select Import. Browse for the Feature Extraction protocol (.xml) and click Open to load the protocol into the Feature Extraction database. Visit Agilent Web site at www.genomics.agilent.com/article.jsp?pageId=2058 to download the latest protocols.
Protocols are also available automatically from SureDesign if configured appropriately. See Automatic Download from SureDesign on page 60 for configuration.
5 Save the Feature Extraction Project (.fep) by selecting File > Save As and browse for desired location.
6 Verify that the icons for the image files in the Feature Extraction Project Window no longer have a red X through them. A red X through the icon indicates that an extraction protocol was not selected or that the Grid Template is not in the database. If needed, reselect the extraction protocol for that image file.
7 Select Project > Start Extracting. 8 After the extraction is completed successfully, view the QC report for each
extraction set by double-clicking the QC Report link in the Summary Report tab. Determine whether the grid has been properly placed by inspecting Spot Finding of the Four Corners of the Array.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 59
4 Microarray Processing and Feature Extraction Step 2. Extract data using the Feature Extraction program
Automatic Download from SureDesign
Feature Extraction version 10.7 or higher can automatically download Grid Templates, protocols and QC metrics (QCM or QCMT). To set this up, in the eArray Login Setting dialog box, under Advanced Options, click Use eArray server during extraction. See Figure 26.
Figure 26. eArray Login Setting. You can mark the other two check boxes under Advanced Options if you want to get update of grid templates already in the database or to get protocol updates. See the Feature Extraction user guide for more information.
60 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
5 Reference Reagent Kit Components 62 Secure Fit Slide Box Opening Instructions 63 Microarray Handling Tips 65 Agilent Microarray Layout and Orientation 66 Array/Sample tracking on microarray slides 68 Notes and Considerations 69
This chapter contains reference information that pertains to this protocol.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 61
5 Reference Reagent Kit Components
Reagent Kit Components
The contents of the reagent kits used in this protocol are listed here.
SureTag DNA Labeling Kit 10 Restriction Enzyme Buffer*
BSA* Alu I* Rsa I* Purification Column Nuclease-Free Water Exo (-) Klenow 5 Reaction Buffer Cyanine 5-dUTP Cyanine 3-dUTP 10 dNTPs Random Primer
Oligo aCGH/ChIP-on-chip Hybridization Kit 2 HI-RPM Hybridization Buffer 10 aCGH Blocking Agent
Oligo aCGH/ChIP-on-chip Wash Buffer Kit Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 1 Agilent Oligo aCGH/ChIP-on-Chip Wash Buffer 2
* Not used in this protocol.
62 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
5 Reference Secure Fit Slide Box Opening Instructions
Secure Fit Slide Box Opening Instructions
Agilent now ships all microarray slides in a newly designed secure fit slide box. The instructions below describe how to remove the slide box from the shipping pouch, how to open the slide box, and how to properly remove a microarray slide. 1 Use scissors to cut below the seal and remove box from its foil pouch.
After breaking foil on microarray pouch, store microarray slides in the slide box at room temperature (in the dark) under a vacuum desiccator or nitrogen purge box.
Figure 27. Opening foil pouch (left) and removing the slide box (right)
2 Place the slide box on a flat surface. While stabilizing the box from the top with one hand, use a sharp edge to cut the sealing tape on both sides of the box before opening.
Figure 28. Cutting the sealing tape
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 63
5 Reference Secure Fit Slide Box Opening Instructions
3 With one hand, firmly hold the base of the box on the sides with the indentations (or dimples) for added grip.
Figure 29. Gripping the base at the indentations (top) and close-up of the indentations (bottom)
4 Using your free hand, grasp the lid and gently lift it away from the base as if it is hinged. Set the lid aside.
Depending on your preference, you can reverse the hand positions so that the left hand holds the base while the right hand grasps the lid.
Figure 30. Grasping the lid (left) and lifting the lid from the base (right)
64 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
5 Reference Microarray Handling Tips
Microarray Handling Tips
Each microarray is printed on the side of the glass slide containing the Agilent-labeled barcode. This side is called the active side. The numeric barcode is on the inactive side of the slide.
In this processing and hybridization procedure, the hybridization mixture is applied directly to the gasket slide, and not to the active side of the oligo microarray. Instead, the active side of the oligo microarray is placed on top of the gasket slide to form a sandwich slide pair.
To avoid damaging the microarray, always handle glass slides carefully by their edges. Wear powder-free gloves. Never touch the surfaces of the slides. If you do, you may cause irreparable damage to the microarray.
Never allow the microarray surface to dry out during the hybridization process and washing steps.
CAUTION You must familiarize yourself with the assembly and disassembly instructions for use with the Agilent Microarray Hybridization Chamber (G2534A) and gasket slides. Practice slide kits are available.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 65
5 Reference Agilent Microarray Layout and Orientation
Agilent Microarray Layout and Orientation
Agilent oligo microarray (1 microarray/slide format) as imaged on the Agilent microarray scanner
Figure 31. Agilent microarray slide and slide holder
Agilent oligo microarrays formats and the resulting microarray design files are based on how the Agilent microarray scanner images 1-inch x 3-inch glass slides. Agilent designed its microarray scanner to scan through the glass slide (back side scanning). The glass slide is securely placed in an Agilent microarray slide holder with the Agilent labeled barcode facing the opening of the slide holder (on SureScan Microarray Scanner) or facing the inside of the slide holder (Scanner C or Scanner B). In this orientation, the active side containing the microarrays is protected from potential damage by fingerprints and other elements. Once securely placed, the numeric barcode, non-active side of the slide, is visible from the outside of the slide holder.
Figure 31 depicts how the Agilent microarray scanner reads the microarrays and how this relates to the microarray design files that Agilent generates during the manufacturing process of its in situ-synthesized oligonucleotide microarrays. Thus, if you have a scanner that reads microarrays from the front side of the glass slide, the collection of microarray data points will be different in relation to the microarray design files. Therefore, please take a moment to become familiar with the microarray layouts for each of the Agilent oligo microarrays and the layout information as it pertains to scanning using a front side scanner.
Microarrays are printed on the side of the glass with the Agilent-labeled barcode (also referenced as "active side" or "front side").
Agilent Microarray Scanner scans through the glass. (Back side scanning.)
00116789
Agilent microarray slide holder for SureScan (above) and Scanner C (below) microarray scanners.
66 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
5 Reference Agilent Microarray Layout and Orientation
Non-Agilent Front Side Microarray Scanners
When scanning Agilent oligo microarray slides, the user must determine: If the scanner images the microarrays by reading them on the front side of
the glass slide (Agilent-labeled barcode side of the slide) and If the microarray image produced by the non-Agilent scanner is oriented in a
portrait or landscape mode, and Agilent-labeled barcode is on the left-side, right-side, up or down, as viewed as an image in the imaging software (see Figure 32).
This changes the feature numbering and location as it relates to the microarray design files.
Figure 32. Microarray slide orientation
Front side barcode left (landscape)
Front side barcode right
(landscape)
Front side barcode up (portrait)
Front side barcode down
(portrait)
Agilent
A gi
le nt
Agilent
A gilent
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 67
5 Reference Array/Sample tracking on microarray slides
Array/Sample tracking on microarray slides
Use the forms below to make notes to track your samples on microarray slides.
Figure 33. 2-pack microarray slides
Figure 34. 4-pack microarray slides
Array 1_ Array 1_2
Sample: Sample:
Arrays
B A R C O D E
Barcode Number ______________________________________________________________
Array 1_1 Array 1_2 Array 1_3 Array 1_4
Sample: Sample: Sample ample:
Arrays
B A R C O D E
Barcode Number __________________________________________________________
68 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
5 ReferenceReference Notes and Considerations
Notes and Considerations
Methylated DNA IP lets investigators capture DNA sequences and study their relative methylation levels across an entire genome. The protocol requires an antibody to 5-methyl cytosine that will immunoprecipitate methylated DNA from a DNA sample.
The Methylated DNA Immunoprecipitation protocol consists of five general steps: DNA shearing Methylated DNA immunoprecipitation DNA labeling Microarray hybridization and washing Microarray scanning and storage
This reference summarizes the goals and steps for this protocol. Other considerations outside of this protocol include initial probe and microarray design and the design and implementation of robust quantitative metrics that validate success at multiple steps of the protocol.
1. Chromatin immunoprecipitation (ChIP)
Goal Use selective antibody bound to magnetic beads to specifically capture the Methylated DNA.
SOP 1 Mix antibody bound to magnetic beads (Dynal) with DNA sample. 2 Place at 4C overnight on a rotating platform. 3 Isolate the beads containing the antibody bound to the methylated DNA. 4 Wash 2 times with buffer to remove non-specific contaminants. 5 After the wash, heat the complexes for a few minutes with detergent to elute
the methylated DNA from the antibody and beads.
Key variables Beads, type, and quantity Time Temperature Immunoprecipitation buffer, volume, and composition Wash buffer composition Number of washes
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 69
5 ReferenceReference Notes and Considerations
QC Metrics After the DNA is isolated (step 2), you can run the Bioanalyzer or gel equivalent to assess fragment size after shearing. Use 1 L for the Bioanalyzer, or 5 L on a 1.5% agarose gel.
Notes Magnetic beads coated with protein G are routinely used due to their ease-of-use and ability to bind a variety of antibodies. Other coatings (e.g. protein A) and bead types (e.g. agarose) are available but have not been validated by Agilent.
Figure 35. Human liver DNA (Biochain p/n D1234149) was sonicated following the procedure outlined in Step 2. Prepare DNA for Immunoprecipitation on page 19. 1 L (~20 ng) of sheared DNA was analyzed using the Agilent 2100 Bioanalyzer in conjunction with the DNA High Sensitivity Kit (p/n 5067-4626). The expected size distribution is between 200 and 1000 bp.
2. DNA isolation
Goal Purify DNA from associated proteins and RNA and protein contaminants.
SOP 1 Purify the DNA via organic extraction and ethanol precipitation.
Key variables Temperature Time SDS concentration
QC Metrics None
3. DNA labeling
Goal Incorporate fluorescent-tagged nucleotides into the IP and reference DNA for hybridization.
SOP 1 Use the Agilent SureTag DNA Labeling Kit. 2 Do 1 Labeling reaction for each sample. Approximately 1 g input per reaction
for the reference channel cyanine 3, and all IP DNA for the cyanine 5. 3 Anneal random primers to the DNA. 4 Extend primers using high concentration exo- Klenow enzyme and
fluorescent-labeled nucleotides. 5 Purify labeled DNA using the Amicon 30 kDa columns.
70 Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol
5 ReferenceReference Notes and Considerations
Key variables Reaction size Reagent quantity (input DNA material, Cy dye, enzyme) per reaction
QC Metrics Nanodrop measurement of total DNA yield (expect >2.5 g per reaction); Nanodrop measurement of pmol/L dye (expect >2 pmol/L with Cy5-dUTP and >3 pmol/L with Cy3-dUTP).
4. Microarray hybridization and washing
Goal Hybridize material to and wash excess/nonspecific material from Agilent 60-mer oligo arrays to yield low background and high signal (flat background with high peaks)
SOP 1 Hybridize for 40 hours at 67C in hybridization oven rotating at 20 rpm. Hybridization buffer contains a proprietary wetting agent (that keeps bubbles moving freely), approximately 5 g labeled DNA per channel (10 g total) and competitor nucleic acids.
2 Wash slides in a series of two buffers with an optional 3rd wash that contains ozone-scavenging reagents to help prevent premature dye degradation.
Key variables Hybridization duration Quantity of labeled material Temperature Type and quality of detergent Type and quantity of nucleic acid competitors
Notes These conditions are identical to those developed for Agilent aCGH hybridizations. Refer to the Bioreagent Wash/Dry Solution application note for more information. The wash conditions are specific for Agilent's ChIP-on-chip application.
5. Microarray scanning and storage
Goal Extract data from microarray; store microarray for possible future analysis
SOP 1 Use default settings on Agilent scanner.
2 Store used slides in N2 box.
Agilent Microarray Analysis of Methylated DNA Immunoprecipitation Protocol 71
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