Alice:LabNotes/2008-9-15

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Revision as of 21:07, 15 September 2008 by >Zsakura2 (→‎extending the probe length)
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extending the probe length

After PCR amplification after CircleHelper insertion, T7 exonuclease digestion was performed. And the detailed procedures can 
be found through this link: [[1]]
Page Denaturing Gel
1. Add TBE-Urea sample buffer (2x) in each tube.
2. Mix 0.5 uL Invitrogen 10bp ladder with 3.5 uL dH2O, 4 uL 2x TBE-Urea sample buffer.
3. Denature at 75C for 8 min, then quickly transfer to ice, wait for 1 min.
4. Use a 2D well denaturing gel, add 0.5x TBE buffer. Flush the wells very well to remove all urea. 
5. Pre-run the gel for 10 min at 200V, load the samples into the wells, run at 200V for 30 min.
6. Stain gel with 5uL SYBR Gold in ~100 mL of TBE in clean tray. Place tray on an orbital shaker for ~5 min.

2D gel to take out the band we are interestd in (160bp):
File:ZhangLab 2 2008-09-15 12hr 53min.jpg
 Purify the product from the gel
1. Prepare two gel shearing assemblies by placing a 0.5 mL tube within another 1.5 mL Non-Stick tube. Use
G20 needle to punch a small hole at the bottom of the 0.5 mL tube. You need two assemblies for each PAGE gel. 
2.Cut out the correct band, split into two half and transfer each half to one shearing assembly.
3. Centrifuge at top speed > 12000 rpm for 2 min to sheer the gel, remove the 0.5 mL tube.
4. Add 400 uL clean 1x TE buffer in the 1.5 mL tube. Tape the tubes on a vortexer, place the vortexer in 37C
incubator, shake the tubes at low speed for 45 min.
5. In the PCR hood, transfer the gel mix to Nanosep columns, spin for 3 min at top speed (15,000 rpm), and then transfer
supernatant to 1.5mL tube.
Precipitation
1. Add 0.1x of 3M sodium acetate and 2.5x 100% ethanol.
2. Add 1uL Glycoblue so that one can precipitate better and see the DNA.
3. Freeze in -70C for 20 min, spin at 14,000 rpm for 15 min at 4C, discard supernatant with pipette.
4. Add 500 uL of 75% ethanol to wash DNA, spin at 8000 rpm for 5 min at 4C, discard supernatant with 
first large tip and then small tip to remove as much liquid as possible.
5. Let dry in hood ~ 10 min.
6. Add 20 uL of water(totally) to the tube to resolve the DNA in, leave at least 15 min.