Pooled Genome-Scale CRISPR-Cas9 Knock-out Screens in Human Cells
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- Phebe Shields
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1 Pooled Genome-Scale CRISPR-Cas9 Knock-out Screens in Human Cells This is a research protocol that describes a protocol to perform pooled genome scale grna depletion screens in human cells using CRISPR libraries 1. Introduction 2. Biosafety Practices 3. Procedures 4. References 1 Introduction: CRISPR-Cas9 technology has provided an efficient approach for gene inactivation. Through a synthetic single grna (sgrna), Cas9 nuclease can be programmed to induce loss of function mutations at the target site. We have developed a unique all-in-one CRISPR-Cas9 grna lentiviral library (TKOv3) that covers all ~18,000 human genes to enable genome-scale loss of function screens in mammalian cells. Cas9 and sgrna are simultaneously delivered on a single vector allowing application to any cell type. Library description: The CRISPR TKO v3 pooled library consists of specific sgrna for gene knock out in the human genome. The library targets 18,049 protein coding genes with 71,090 grna sequences (4 targeting grna sequences per gene). 2 Biosafety practices: The entire assay procedure will be performed in a Class IIa biosafety cabinet and 37 C, 5% CO 2 incubator. Aseptic techniques must be practiced to ensure sterility. Before the start of experiments all working surfaces will be wiped with 70% ethanol. Hood sash must be at proper position to maintain laminar air flow, avoid clutter and do not block air vents with bulky items. Laboratory staff must wear protective clothing at all times, including lab coat, gloves and closed-toed shoes. Liquid waste will be collected in a separate container and neutralization with 20% bleach for a minimum of 30 minutes. After decontamination is complete, the liquid will be poured into the sink in the tissue culture room. Any liquid spills will be absorbed with paper towels and the area decontaminated with a 10% bleach solution. Following the completion of the experiment, all working surfaces will be wiped with 70% ethanol. 1
2 Lentiviral precautions: When working with active lentiviral (production, MOI determination and primary infection steps), double gloves must be worn and no waste can exit the hood until treated with bleach. No vacuum pumps can be used, liquid waste must be manually removed and bleached for 30 minutes before discarding. 3 Procedures: 3.1 Toronto KnockOut version (TKO v3) CRISPR Library Amplification 1. Dilute the TKO library to 50 ng/µl in TE. 2. Electroporate the library a. Set up 4 electroporations as follow: b. Add 2 µl of 50 ng/µl TKO library to 25 µl of Lucigen Endura electrocopetent cells (cat no ); c. Electroporate according to the manufacturer s suggested conditions and protocol; d. Add 975 µl of Recovery Medium (or SOC medium); e. Transfer cells to a culture tube with an additional 1 ml of Recovery Medium; f. Place tubes in a shaking incubator at 250 rpm for 1 hour at 37 C. 3. Titer the library The dilution plate is used to estimate transformation efficiency to ensure that full library representation is preserved. a. Pool all 8 ml of recovered cells. Mix well. b. Transfer 10 µl of cells to 990 µl of Recovery Medium, mix well, and plate 20 µl onto a pre-warmed 10-cm LB + carbenicillin agar plate (this is a 40,000-fold dilution of the full transformation) 4. Plate the library a. Spread recovered cells on a total of cm LB + carbenicillin agar plates. b. Spread 400 µl of recovered cells on each of the pre-warmed plate. 5. Incubate the plates for hours at 30 C. 6. Calculate transformation efficiency a. Count the number of colonies on the dilution plate. b. Multiply this number of colonies by 40,000 for the total number of colonies plated. c. Proceed if the total number of colonies is at least 1.4 x This efficiency is equivalent to 200X colonies per guide-rna construct in the TKO v3 library. 7. Harvest colonies a. Transfer 7 ml of LB + carbenicillin medium on one 15-cm plate. b. Scrape the colonies off with a cell spreader. 2
3 c. Transfer the scraped cells into a sterile bottle using a 10-mL pipet. d. Rinse the scraped plate with an additional 5 ml of LB + carbenicillin medium and transfer to the bottle. e. Pool all scraped cells from 20 plates to the bottle. f. Transfer cells to pre-weighed centrifuge bottles. g. Centrifuge and discard media. h. Weigh the wet cell pellet. 8. Purify the library plasmid pool a. Purify plasmid DNA using a maxi- or mega-scale plasmid purification kit. b. Perform multiple maxi or mega preps according to column capacity. Typically, a maxi column can process 1 g of wet cell pellet, and a mega column can process 2.5 g of wet cell pellet. 3.2 Large scale lentivirus production of TKOv3 in 15-cm TC plates *Biosafety precautions: Double gloves should be worn and all virus waste requires incubation in 20% bleach for 30 minutes before disposal Materials needed: 293T packaging cells (recommended: passage number < 15) Transfection quality plasmids: CRISPR library, pspax2 (packaging plasmid), pmd2.g (envelope plasmid) X-tremeGENE 9 DNA Transfection reagent (Roche, ) OPTI-MEM serum-free media (Invitrogen, # ) Cell seeding media - Low-antibiotic growth media (DMEM + 10% FBS + 0.1x Pen/Strep): o 500 ml DMEM (Dulbecco's Modification of Eagle's Medium) o 50 ml ifbs (heat-inactivated Fetal Bovine Serum; e.g. HyClone #SH ) o 0.5 ml 100x Pen/Strep Viral harvest media- Serum-Free, High-BSA 293T growth media (DMEM + 1.1g/100mL BSA + 1x Pen/Strep) o 500 ml DMEM (Dulbecco's Modification of Eagle's Medium) o 32 ml 20g/100mL BSA stock o 5 ml 100x Pen/Strep Instructions: 1. Seed 293T packaging cells in low-antibiotic growth media. 8E6 9E6 cells/15 cm plate in 20 ml media. For 1L virus production prepare ~60 plates 2. Incubate cells for 24 hours (37 C, 5% CO2), or until the following afternoon. The cells 3
4 should be 70% -80% confluent at moment of transfection. 3. Transfect packaging cells: a. Prepare a mixture of the 3 transfection plasmids (~ 1:1:1 Molar Ratio) in optimem. Amount needed per 15cm plate: 4.8 μg pspax2 3.2 μg pmd2.g 8 μg TKOv3 library b. Prepare 1x OptiMem and X-tremeGENE dilutions for each plate (i.e for 60 plates, you will need 60 tubes with 1x X-tremeGENE dilutions). Add X-tremeGENE directly into Optimem and gently flick the tube (do not mix by pipetting or vortexing). Incubate maximum 5 minutes at room temperature. Amount X-tremeGENE needed per 15-cm plate: 48 µl X-tremeGENE diluted in 800µL OptiMEM c. Following 5 minutes incubation, add appropriate amount of plasmid for a 3:1 ratio of Transfection Reagent:DNA Complex. Drop DNA to X-tremeGENE mixture and mix by gently flicking the tube. d. Incubate the transfection mix for 30 minutes. e. Carefully transfer the transfection mix to the packaging cells by adding drop-wise in circular, zigzag motion. 4. Incubate cells for 18 hours (37 C, 5% CO 2 ). 5. Change media to remove the transfection reagent and replace with high-bsa growth media for viral harvests (18-20mL/15cm plate). 6. Incubate cells for 24 hours (37 C, 5% CO 2 ). 7. Next day, harvest media containing lentivirus at ~40 hours post-transfection. Transfer media to a polypropylene storage tube. 8. Spin the media containing virus at 1000 rpm for 3 minutes to pellet any packaging cells that were collected during harvesting. Aliquot supernatant into sterile polypropylene storage tube. 9. Virus may be stored at 4 C for short periods (hours to days), but should be frozen at -80 C for long-term storage. To reduce the number of freeze/thaw cycles, aliquot largescale virus preps to smaller storage tubes prior to long-term storage. 4
5 3.3 Cell Line Characterization Select desired cell line. Ensure cell line is mycoplasma free before starting screen. Ensure that cells adhere reasonably well to tissue culture vessels. Ensure that all media requirements (+/- serum, growth factors, etc.) are met. Determine optimal cell plating density. Typically, the cell culture for pooled screens is done in 15cm plates. Measure and RECORD the approximate doubling time of your cells. Determine puromycin sensitivity of cell line by doing a kill curve. This can be done in 12 well plates, and can be measured either by cell counting or by trypan blue staining. Dilution range should span 0 μg/ml to 5 μg/ml in 0.5 μg/ml increments. Concentration of puromycin to be used in screen should be μg/ml higher than that required to kill 100% of uninfected cells in 48hrs. Check cells for sensitivity to either polybrene (up to 8 μg/ml) or protamine sulphate (up to 5μg/mL) by doing a dose response curve in the same method as used for measuring puromycin sensitivity. 3.4 Lentivirus MOI determination **The multiplicity of infection (MOI) must be determined under the same cell culture conditions used during the primary screen. This includes using the same tissue culture vessels, media constituents and volume, cell plating density, and pooled virus preps (without prior thaws) that will be used in the screen. Measurements made in different formats (e.g. 6-well plates) cannot be reliably scaled to the screening format. Day 1 Thaw a fresh aliquot of TKOv3 pooled lentivirus (keep on ice). Harvest cells for test infection, and measure number of cells/ml. (HAP1 requires 3E6-5E6 cells/plate). Design dilution series of virus for MOI determination between 0 to 2 ml. Prepare 15-cm plates using the same condition as would be used during the primary screen. To each 15-cm plate aliquot cells, media and polybrene (final conc. 8 ug/ml) and then add your designated volume of virus. Add the same volume of virus to two vessels for each dilution point. Mix plates thoroughly by tilting for 2 min. If your incubator is not level, you can let plates sit level in hood for up to 1 hr. Transfer plates to incubator. Ensure that they sit level. 5
6 Day 2 Day 4 24hrs after addition of virus, cells should be infected and tightly adhered to plate. Remove media using pipettes (dispose of media and pipettes in 20% bleach solution). Gently wash plate with warm PBS to remove any extraneous virus (dispose of PBS and pipettes in 20% bleach solution). Add fresh media (20 ml for 15-cm plate) containing puromycin at the required concentration (1 μg/ml for HAP1) to vessels of one virus dilution series and fresh media without puromycin to the other virus dilution series. Return plates to incubator. After 48 hrs, all uninfected cells should be dead. You must use a dose of puromycin that will kill all uninfected cells within 48hrs. Remove media. Gently wash plates with warm PBS to dislodge remaining dead cells. Trypsinize and collect cells from each plate into 15mL screw-cap tubes. Make sure that any clumps of cells were dispersed by repeated gentle pipetting. Count cells from all plates and graph results for the two series (+/- puromycin). Determine virus volume that gives 30-40% survival with puromycin selection vs. without puromycin. This is the volume of pooled virus that gives MOI of with the tissue culture conditions that you used. **All pipettes and media waste should be disposed in 20% bleach 3.5 Pooled grna depletion screens 1.1. Primary screen infection and cell passaging 1.2. Genomic DNA extraction Step CRISPR Library Barcode PCR 1.4. TKO Analysis Primary Screen Infection and Cell Passaging Expand cells to approximately 80-90E6 cells for Day 1. Day 1 (infection) The total number of cells plated for infection should be such that with infection at MOI 0.3, puromycin selection and the growth rate of the cells, you will be able to harvest ~ 120E6 cells on T0. 6
7 Infections are done in 15-cm TC plates. For 200-fold TKOv3 library coverage at an MOI 0.3 in HAP1 cells, 50E6 cells are required for infection at 3-5E6 HAP1 cells/ plate. Extra plates are prepared to accommodate MOI fluctuations and control plates are also required. The following plates are needed: o Screening plates: Virus + puromycin o Control 1- No virus + puromyocin (0% survival control) o Control 2- Virus + No puromycin (100% survival control) Harvest cells and pool into a sterile vessel. Seed required cell number to each plate. Add virus + polybrene 8 µg/ml to plates. Mix thoroughly by titling the plates for 2 minutes. Alternatively, batch infections can be done by adding virus and polybrene to cells in suspension, mixing well, then plating. Option: Leave plates in hood for 1h, ensure they are level. Place plates in the incubator, ensure they are level. Day 2 Puromycin Selection 24 hours after addition of virus, cells should be infected and tightly adhered to plate. Remove media using pipette (dispose of media and pipettes in 20% bleach solution). Gently wash plate with warm PBS to remove any extraneous virus (dispose of PBS and pipettes in 20% bleach solution). Add fresh media containing puromycin at the required concentration to the cells. Day 4 T0 48 hours after puromycin addition, all uninfected cells should be dead (control 1) Remove media, gently wash plate with warm PBS to dislodge remaining dead cells. It is important to remove all dead cells since their genomic DNA can contaminate the T0 prep. Wash twice with PBS if necessary. Trypsinize and collect cells from all plates into one sterile container. Make sure that all cell clumps are dispersed by gentle repeated pipetting when harvesting cells from plates/flasks. Count cells and calculate number of cells/ml. Collect 3 replicates of 20E6 cells by centrifugation: Spin at 1200 rpm for 5 minutes. Wash with PBS. Label tubes and freeze the cell pellets dry at -80 C. These are your time zero (T0) samples. 7
8 From the pool, plate cells into three replicate groups. Do NOT use puromycin in this or in subsequent plating steps. Each replicate should contain in total 15E6 cells across the required number of vessels (use exactly same number of cells for each replicate plate, and exactly same number of total cells between each replicate- example Replicate A seed 3 plates at 5E6/plate for total 15E6 cells, repeat for Replicate B and C). **15E6 cells gives ~200-fold representation for each grna in the 72k pool. If desired, you may use higher representation, 200-fold should be considered a minimum. Day 5 Onward (T1, T2, T18) Most adherent cell lines require splitting every 3-8 days. The pool-infected cells should be passaged at the same density that you normally would split when expanding them. You may notice a transient slowing of cell growth after the infection, with a return to normal growth speed 5-15 days after infection. The length and severity of this effect is cell-line dependent. Each instance that you passage the cells out to the end-point (~3 weeks), do the following things: o Trypsinize and collect cells. Pool cells from all the vessels in each separate replicate group with each other (ie. all the cells from replicate A are re-mixed together from separate plates, all the cells from replicate B are re-mixed together from separate plates, etc.). This serves to minimize stochastic growth effects in random sub-populations in individual vessels within a replicate group. o Re-plate 15E6 cells for each replicate group exactly as done at T0. o Freeze down 20E6 cells per pellet for each replicate group. Each pellet gets a time (T) number and a replicate designation. This number corresponds to the number of days post T0 that it was collected (eg. T3_A, T6_B, T_C, etc). If you chose to pellet more cells, make sure that ALL pellets collected in the screen have the same number of cells. * note: pelleting more cells (ie. 20E6) than the 15E6 cells representation of 200-fold buffers for material loss during downstream genomic DNA processing procedures Genomic DNA (gdna) Extraction and DNA precipitation gdna extraction is performed using the QIAamp Blood Maxi kit (cat no ) and RNase A (cat no ) essentially as described in the kit manual. Follow the instructions below, using the indicated volumes and refer to the kit manual for extra details if required. 8
9 This protocol is optimized for cell pellets containing 20-50E6 cells (we generally use for 20E6 cells). ***It is very important to use a swinging-bucket rotor in a centrifuge that is capable of attaining the required g-force. Failure to do so will result in low yield and dirty genomic DNA*** Prepare 70 C water bath with rack for your tubes. Ensure that buffers are prepared and ready to use. Thaw cell pellets in 37 C water bath for 5-10 min. Label samples and pre-label tubes and columns to be used in extraction. Pre-warm buffer AE to 65 C. Use plugged pipette tips for all steps contamination of the gdna is to be avoided! 1. Prepare Qiagen protease solution in water as instructed on the bottle. 2. Add 4.5 ml of sterile PBS to each cell pellet. Resuspend cells with P1000 pipette. Seal tubes tightly and vortex thoroughly to disperse cells. Pipette to disrupt cell clumps if needed. 3. Add 105 µl of RNase A (100 mg/ml) to resuspended cells. 4. Mix briefly by swirling. Incubate at room temperature for 5 min. 5. Add 500 µl of Qiagen protease solution to each sample. Mix briefly by swirling. 6. Add 6 ml of Buffer AL. Mix by inversion for 2 min. 7. Incubate tube at 70 C for 15 min. 8. Cool tube at room temperature for 30 min. 9. Add 5 ml of 100% ethanol. Mix by inversion for 2 min. 10. Place the pre-labeled QIAamp maxi column in a 50 ml centrifuge tube. 11. Transfer lysate onto the column using a 10 ml pipet. 12. Centrifuge tube at 1,850 x g for 3 min at room temperature. 13. Transfer column into a new 50 ml centrifuge tube. 14. Transfer the flow-through onto the column for a second binding. 15. Centrifuge tube at 1,850 x g for 3 min at room temperature. 16. Transfer column into a new 50 ml centrifuge tube. 17. Add 5 ml of Buffer AW1 to the column. 18. Centrifuge tube at 4,500 x g for 2 min at room temperature. 19. Add 5 ml of Buffer AW2 to the column. 20. Centrifuge tube at 4,500 x g for 15 min at room temperature. 21. If any buffer remains on the inside edge of the column, or the filter appears to be wet, uncap the columns and dry in a warm incubator for ~15 minutes. 22. Place the QIAamp maxi column into a new 50 ml centrifuge tube. 23. Transfer 1,000 µl of Buffer AE (pre-warmed 65 C) directly onto the membrane and cap the tube. 9
10 24. Incubate the tube at room temperature for 10 min. 25. Centrifuge tube at 4,500 x g for 15 min. 26. Transfer an additional 1,000 µl of Buffer AE (pre-warmed to 65 C) directly onto the membrane and cap the tube. 27. Incubate the tube at room temperature for 10 min. 28. Centrifuge tube at 4,500 x g for 15 min. 29. Transfer the 450 µl eluted DNA into each of the four 1.5 ml microfuge tubes. 30. Proceed to genomic DNA precipitation or store at -20 C until needed. Genomic DNA Precipitation 1. Transfer 400 µl genomic DNA into each of the 1.5 ml microfuge tube (total of 5 tubes). 2. Add 18 µl of 5 M NaCl (final concentration of 0.2 M) and 900 µl of 100% ethanol. Do NOT use sodium acetate as residual acetate interferes with downstream PCR. 3. Invert tube 10 times or until thoroughly mixed. 4. Centrifuge at 13,000 rpm for 15 minutes at 4 C. 5. Aspirate supernatant, careful to avoid the DNA pellet. 6. Wash DNA pellet with 500 µl of 70% ethanol. 7. Invert tube gently 5 times. 8. Centrifuge at 13,000 rpm for 15 minutes at 4 C. 9. Aspirate supernatant, careful to avoid the DNA pellet. 10. Air dry DNA pellet for ~10 minutes 11. Add 75 µl of TE to each of the four tubes of DNA pellet (total of 300 µl). 12. Heat samples at 50 C for ~1 hour (or until completely dissolved). Gently vortex at 20 minute intervals to fully solubilize the DNA. Make sure that DNA is fully solubilized with no lumps or clumps. 13. Transfer DNA into low-binding microfuge tubes for storage. Vortex to mix DNA thoroughly. 14. Quantitate and measure purity of genomic DNA on both NanoDrop and Qubit TKO v3 CRISPR Sequencing Library Preparation Perform 2 PCR to (1) enrich guide-rna regions in the genome and (2) amplify guide-rna with Illumina TruSeq adapters with i5 and i7 indices. Always perform one PCR without any genomic DNA template in order to ensure there is no contaminating template (for both PCR) The resulting libraries can be sequenced on Illumina HiSeq 2500 or NextSeq
11 - For HiSeq 2500, standard Single-Read (SR) 50-cycle chemistry with dual-index. - For NextSeq 500, standard Single-Read (SR) 75-cycle chemistry with dual-index. - Dark Cycle: 21; Read 1: 26; Index Read 1: 8; Index Read 2: 8 PCR 1 Assuming a diploid genome is ~6.5 µg and one guide-rna per genome, 50 µg of genomic DNA yields ~100-fold coverage of the TKO v3 library. Quantify genomic DNA concentration using Qubit dsdna BR Assay (cat no. Q32853). Add 2.5 µg of genomic DNA per 50 µl reaction. Set up identical 50 µl reactions to achieve the desired coverage. 1. Set up PCR 1 as follow 1x 2x NEBNext Ultra II Q5 Master Mix 25 µl 10 µm v2.1-f1 2.5 µl 10 µm v2.1-r1 2.5 µl Genomic DNA 2.5 µg Water up to 50 µl Total 50 µl 2. Amplify reactions in a thermocycler using the following program Step Temperature Time 1 98 C 30 sec 2 98 C 10 sec 3 66 C 30 sec 4 72 C 15 sec 5 72 C 2 min 6 10 C Hold 25 cycles (step 2 4) 3. Run 2 µl of PCR 1 product on a 1% agarose gel. Visualize the PCR product on a gel imager. PCR 1 yields a product of 600 bp. 4. Pool all individual 50 µl reactions for each genomic DNA sample, mix by vortex. PCR 2 11
12 Use unique i5 and i7 index primer combinations for each individual sample to allow pooling of sequencing libraries. Set up one 50 µl reaction for each sample. Use 5 µl of the pooled PCR 1 product as template. 5. Set up PCR 2 as follow 1x 2x NEBNext Ultra II Q5 Master Mix 25 µl 10 µm i5 primer 2.5 µl 10 µm i7 primer 2.5 µl PCR 1 product 5 µl Water 15 µl Total 50 µl 6. Amplify reaction in a thermocycler using the following program Step Temperature Time 1 98 C 30 sec 2 98 C 10 sec 3 55 C 30 sec 4 65 C 15 sec 5 65 C 5 min 6 10 C Hold 10 cycles (step 2 4) 7. Run 50 µl of PCR 2 product on a 2% agarose gel. PCR 2 yields a product of 200 bp. 8. Visualize the PCR product on a Dark Reader (blue light transilluminator). Excise the 200 bp band and purify DNA from agarose gel slice using a gel extraction kit. 9. Quantitate and measure purity of sequencing library on both NanoDrop and Qubit. 12
13 PCR Primers PCR 1 primers are regular desalted oligos. PCR 2 primers can be ordered from IDT as desalted Ultramer DNA oligos. PCR 1 Primer Sequences v2.1-f1 GAGGGCCTATTTCCCATGATTC v2.1-r1 GTTGCGAAAAAGAACGTTCACGG PCR 2 Primer Sequences i5 forward primers D501 -F AATGATACGGCGACCACCGAGATCTACACTATAGCCTACACTCTTTCCCTACACGACGCTCTTC CGATCTTTGTGGAAAGGACGAAACACCG D502-F AATGATACGGCGACCACCGAGATCTACACATAGAGGCACACTCTTTCCCTACACGACGCTCTTC CGATCTTTGTGGAAAGGACGAAACACCG D503-F AATGATACGGCGACCACCGAGATCTACACCCTATCCTACACTCTTTCCCTACACGACGCTCTTC CGATCTTTGTGGAAAGGACGAAACACCG D504-F AATGATACGGCGACCACCGAGATCTACACGGCTCTGAACACTCTTTCCCTACACGACGCTCTTC CGATCTTTGTGGAAAGGACGAAACACCG D505-F AATGATACGGCGACCACCGAGATCTACACAGGCGAAGACACTCTTTCCCTACACGACGCTCTTC CGATCTTTGTGGAAAGGACGAAACACCG D506-F AATGATACGGCGACCACCGAGATCTACACTAATCTTAACACTCTTTCCCTACACGACGCTCTTC CGATCTTTGTGGAAAGGACGAAACACCG PCR 2 Primer Sequences i7 reverse primers D701-R CAAGCAGAAGACGGCATACGAGATCGAGTAATGTGACTGGAGTTCAGACGTGTGCTCTTCCGAT CTACTTGCTATTTCTAGCTCTAAAAC D702-R CAAGCAGAAGACGGCATACGAGATTCTCCGGAGTGACTGGAGTTCAGACGTGTGCTCTTCCGAT CTACTTGCTATTTCTAGCTCTAAAAC 13
14 D704-R CAAGCAGAAGACGGCATACGAGATGGAATCTCGTGACTGGAGTTCAGACGTGTGCTCTTCCGAT CTACTTGCTATTTCTAGCTCTAAAAC D705-R CAAGCAGAAGACGGCATACGAGATTTCTGAATGTGACTGGAGTTCAGACGTGTGCTCTTCCGAT CTACTTGCTATTTCTAGCTCTAAAAC D706-R CAAGCAGAAGACGGCATACGAGATACGAATTCGTGACTGGAGTTCAGACGTGTGCTCTTCCGAT CTACTTGCTATTTCTAGCTCTAAAAC D707-R CAAGCAGAAGACGGCATACGAGATAGCTTCAGGTGACTGGAGTTCAGACGTGTGCTCTTCCGAT CTACTTGCTATTTCTAGCTCTAAAAC Red sequence denotes i5 or i7 index Orange sequence denotes spacer Blue sequence denotes annealing sequence i7 Index i7 Index for i5 Index i5 Index for i7 Sequence i5 Sequence Name Sample Sheet Name Sample Sheet D701 CGAGTAAT ATTACTCG D501 TATAGCCT TATAGCCT D702 TCTCCGGA TCCGGAGA D502 ATAGAGGC ATAGAGGC D704 GGAATCTC GAGATTCC D503 CCTATCCT CCTATCCT D705 TTCTGAAT ATTCAGAA D504 GGCTCTGA GGCTCTGA D706 ACGAATTC GAATTCGT D505 AGGCGAAG AGGCGAAG D707 AGCTTCAG CTGAAGCT D506 TAATCTTA TAATCTTA 14
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