Alice:LabNotes/2008-7-7: Difference between revisions

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  6. Stain the gel with 5 uL SYBR gold in ~100 mL of TBE in clean tray. Place the tray on an orbital shaker for 5 min.  
  6. Stain the gel with 5 uL SYBR gold in ~100 mL of TBE in clean tray. Place the tray on an orbital shaker for 5 min.  
     Then quantify the gel to calculate the % yield.
     Then quantify the gel to calculate the % yield.
<b>Result:</b><br>
% yield: 11.01 ng/ul * 40 ul = 440 ul

Revision as of 22:11, 14 July 2008

Experiment 1: Cosmic probe preparation using iTaq buffer

Real time PCR reaction system:
                                                                x12
H2O                                                75.1ul      901.2 ul
10X iTaq buffer                                      10ul        120 ul
MgCl2(25mM)                                           6ul         72 ul
50x SYBG I                                          0.4ul        4.8 ul
dNTP(2.5mM)                                           8ul         96 ul
primer mix (100uM) AP1V4+AP2V4                      0.2ul        2.4 ul
template(cosmic 3760)                               0.1ul        1.2 ul
Platium Taq polymerase                              0.2ul        2.4 ul
Total                                               100ul       1200 ul     
*48 tubes were prepared*

Result:
File:7-7-08 cosmic 3760.jpg

Step 2: Probe purification with ethanol precipitation

1. pool the 24 reactions into one 16 mL tube, add 240 uL 3M NaOAC, 8 uL GlycoBlue, 
   6 mL 100% Ethanol.
2. Store at -70C for more than 20 min.
3. Spin at 4000rpm for 15 min at 4C.
4. Remove all liqid, you should see a blue pallette at the bottom of the tube.
5. Add 750 uL cold 75% Ethanol, piette well and transfer to a 1.6 mL tube.
6. Spin at 10000 rpm for 5 min at 4C.
7. Remove all liquid, let the pallette dry for 5 min, resuspend the DNA with 250 uL dH2O. Transfer the liquid to two 0.2ml tube.

Step 3: Exonuclease treatment

1. Add 15 uL 10X Exo buffer and 8 uL Lambdo Exonuclease (5K/ml) for total volume of 150uL(each tube).
2. Incubate at 37C for 2 hours followed by 90C for 10 min, and leave it at 4C forever.

Step 4: Purify the reaction with Qiaquick columns

1. for each 150ul tube, add 750 uL of PBI buffer, mix well, load 450 ul each time to column (twice with total of 900 uL)
2. Spin at top speed (14000 rpm) for 1 min
3. Empty the collection tube, add 750 uL wash buffer (PE buffer) to the column
4. Spin at top speed for 1 min
5. Empty the collection tube, spin at top speed for 1 min
6. Carefully transfer the columns to clean 1.6 mL tubes
7. Place the column/tube assemblies to 37C incubator, incubate for 5 min
8. Add 45 uL ddH2O to each column, wait for 1 min, spin at top speed for 1 min.
9. Pool DNAs from the two tubes into one, measure the concentration with Nanodrop.
  • I combined all the reaction product into two 45 ul tubes.*

NanoDrop result:
Tube 1: 26.3 ng/ul * 45 ul = 1183.5 ng
Tube 2: 13.1 ng/ul * 45 ul = 589.5 ng

Step 5: Incubation with USER enzyme:

add 6 uL of 10X DpnII reaction buffer and 10 uL of USER (1K/ml)enzyme and last 8 hour on 37C. 
Take 4ul out to run gel later. 

Step 6: Annealing of DpnII oligo and incubation with DpnII.

1. Add 1uL of 10X DpnII reaction buffer and 10 uL of 100 uM DpnII-V4 guide oligo. Denature at 95C in PCR machine for 10 min. Turn off
the machine and wait for 20 min.
2. Wait until th machine cool to 37C then add 2 uL of DpnII restriction enzyme (50K/ml) to reaction, incubate for
about 4 hours at 37C.

Step 7: Page Denaturing Gel

1. Add TBE-Urea sample buffer (2x) in each tube.
2. Mix 0.5 uL Invitrogen 10bp ladder with 4.5 uL dH2O, 5 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. 
6. Pre-run the gel for 10 min at 200V, load the samples into the wells, run at 200V for 30 min.
7. Stain gel with 5uL SYBR Gold in ~100 mL of TBE in clean tray. Place tray on an orbital shaker for ~5 min.

Results:
Tube 1:
File:ZhangLab 2 2008-07-10 15hr 04min.jpg

Tube 2:
File:ZhangLab 2 2008-07-10 16hr 20min.jpg

Step 8: 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 (85-92 nt in this case), chop the band into small slices, 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 50C incubator,
shake the tubes at low speed for 1 hour. Alternatively, can keep the tubes in 4C fridge overnight.
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.


Step 9: 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.
   * I transfer 500ul 75% ethanol and DNA into another tube and another to accumulate the probe. 

Step 10: Quantification of DNA using denaturing gel and a quantitative ladder

1. Add 8uL of 2ng/uL 90-mer and 8 uL of 2x TBE-Urea buffer
2. Dilute sample 10x (1uL sample + 9 uL of water) so total is 10uL of sample, and add 10 uL of 2x TBE-Urea buffer.
3. Denature the DNA with loading dye on thermalcycler 75C for 15 min, then quickly transfer to ice, wait for 1 min.

Note: Transfer to ice to keep the samples from further denaturation.

4. Use 6% 10 well TBU gel, add 0.5x TBE buffer, flush the wells very well to remove all urea.
5. Pre-run the gel at 200V for 10 min, then load the samples into the wells, run at 200V for 30 min. 
   Load the ladder as 8, 4, 2, 1 uL, and load the samples as 10, 5, 2.5 uL.
6. Stain the gel with 5 uL SYBR gold in ~100 mL of TBE in clean tray. Place the tray on an orbital shaker for 5 min. 
   Then quantify the gel to calculate the % yield.

Result:
% yield: 11.01 ng/ul * 40 ul = 440 ul