Kun:LabNotes/Haplotyping/2011-5-12: Difference between revisions
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65C 15min -> 95C 30 sec -> (95C 10sec -> 58C 30 sec -> 72 1min) x 22 -> 72C 3min. | 65C 15min -> 95C 30 sec -> (95C 10sec -> 58C 30 sec -> 72 1min) x 22 -> 72C 3min. | ||
Monitor the reactions on a real-time thermal cycler and terminate them before the curves reach saturation. | Monitor the reactions on a real-time thermal cycler and terminate them before the curves reach saturation. | ||
*If the amplification curves are good, check the amplicon size with 6% TBE gel. | |||
[[Image:In-Gel-biscvt-MDA-tagmentation-PCR-Plate.png|300px]][[Image:In-Gel-biscvt-MDA-tagmentation-PCR-legend.png|300px]] | [[Image:In-Gel-biscvt-MDA-tagmentation-PCR-Plate.png|300px]][[Image:In-Gel-biscvt-MDA-tagmentation-PCR-legend.png|300px]] | ||
[[Image:In-Gel-biscvt-MDA-tagmentation-PCR-AmpCurve.png| | [[Image:In-Gel-biscvt-MDA-tagmentation-PCR-AmpCurve.png|300px]][[Image:In-Gel-biscvt-MDA-tagmentation-PCR-13May2011.png|300px]] | ||
*If the amplicons have the right size, perform 2nd PCR to add barcodes and sequencing adaptors. | *If the amplicons have the right size, perform 2nd PCR to add barcodes and sequencing adaptors. |
Revision as of 01:25, 14 May 2011
Methylation haplotyping on small number of cells
Idea
- Directly lyse a small number of cells, remove all proteins, denature the gDNA, and trap the ssDNA in polyacrylamide gel.
- Perform bisulfite conversion, followed by limited MDA and tagmentation all directly within the gel.
- Dissect the gel into a number of small pieces, such that each piece contains less than haploid genome, followed by barcoded PCR in tubes.
- The PCR amplicons are pooled for sequencing.
Experiment protocol
- Make dilution of GM20431 cells to 1 cell/ul.
- Mix 10ul of cell solution with 10ul Cell Lysis Buffer(20M EDTA, 10mM Tris.HCl , 200mM NaCl, 0.2% Triton X-100, 0.2AU/ml Qiagen Protease), incubate at 37C for 30min, 75C for 15min. Slowly mix the cell lysate with a P20 pipette for 10 times (to break down chromosomes).
- Prepare gel mix:
H2O 10ul ABD 8ul 30% BSA 0.3ul Cell lysate 20ul 5% TEMED 0.8ul Heat at 94C for 5min, immediately transfer to ice Add 5% APS 0.8ul
- Add 18ul each to two slides, wait ~15 minutes for the gel to polymerize.
- Wash the slides with ddH2O for >5min.
- Place a frameseal chamber on each slide, add 120 ul CT Conversion Reagent (Zymo EZ DNA Methylation Direct Kit), seal the chamber.
- Incubate at 95C 4min -> 64C 4h -> 4C hold.
Roughly half of the CT conversion reagent evaporated in less than 2 hours despite my best efforts in sealing the chamber. So I removed the chambers, put new ones and added new CT Conversion Reagent. 95C 1min -> 64C 2h 15min -> 4C hold.
- Wash the slides twice with ddH2O for >5min.
- Add ~50ul of M-desulphonation buffer onto the gel and let it stand at RT for 15min.
- Wash the slides twice with ddH2O for >5min.
- Set up limited MDA reaction:
10x RepliPhi Buffer 4.0ul 1mM N6 primer 2.0ul 25mM dNTP 0.4ul 2X SYBR Green I 2.0ul RepliPhi Phi29(100U/ul) 2.0ul Exo-minus Klenow (5U/ul) 1.0ul H2O 28.0ul 30% BSA 0.7ul After adding MDA mix to the gel and cover with coverslips, carefully pipette mineral oil to cover the edges of coverslips. Incubate one slide at 30C for 30 min, the other slide at 30C for 1h, head inactivation at 65C for 10min
- Wash the slide with ddH2O for > 5min, air-dry inside PCR hood.
- Prepare tagmentation mix:
Dilute the enzyme: 1:5 5x LMW Buffer 8ul diluted enzyme 4ul H2O 28ul Add 20ul to each gel, cover with a coverslip, seal the edges with mineral oil, incubate at 55C for 10min
- Wash the Wash the slide with ddH2O for > 5min, use a clean scalpel to cut the gel into 12 slices, transfer one into each PCR tube.
- Set up PCR reaction:
x 12 KAPA QPCR mix 25ul Orange Primer (10uM) 1ul Blue Primer (10uM) 1ul Bst Pol (5U/ul) 0.5ul H2O 23ul 65C 15min -> 95C 30 sec -> (95C 10sec -> 58C 30 sec -> 72 1min) x 22 -> 72C 3min. Monitor the reactions on a real-time thermal cycler and terminate them before the curves reach saturation.
- If the amplification curves are good, check the amplicon size with 6% TBE gel.
File:In-Gel-biscvt-MDA-tagmentation-PCR-Plate.pngFile:In-Gel-biscvt-MDA-tagmentation-PCR-legend.png File:In-Gel-biscvt-MDA-tagmentation-PCR-AmpCurve.pngFile:In-Gel-biscvt-MDA-tagmentation-PCR-13May2011.png
- If the amplicons have the right size, perform 2nd PCR to add barcodes and sequencing adaptors.