Dinh:Probes Prep May2015

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Revision as of 00:35, 3 May 2015 by >Dinh (→‎Lambda Exo)
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  • Need more of Subset E. But to save time, I made more of A-E together in case I run out. Noi made one plate of Subset F for me before she left, so I still have a lot of subset F to use.

Current probes concentrations

Subset Qubit (ng/uL)
A 11.84
B 15.4
C 11.92
D 11.76
E ---
F 5.12

Probes production

  • Used 2.0 mL tubes to prepare each reaction master mix:
 Reagent                Volume
 KAPA 2X Sybr Fast      1,100 uL
 Nuclease free water    1,100 uL
 AP1V4                  8.8 uL
 AP2V4                  8.8 uL
 Template (10nM)        4.4 uL  (template was prepared by Noi from starting probes mix). 
 95C 30s -> [ 95C 15s -> 55C 45s -> 60C 30s read plate -> 60C 10s]x20cycles -> 60C 1 min 
  • I used the CFX96 to perform qPCR. The incubation time at each temperature was increased to account for the overhead volume (>50uL).
  • Subsets A,C,D appears to saturate at 14 cycles while B,E saturates at 15
  • I used QIAEX II beads to purify the PCR reactions. Each 2,200 uL total reaction was split into 5x2.0 mL tube.
 Used 20 uL of QIAEX II beads + 3X QX1 buffer.
 Eluted each tube with 50 uL nuclease free water first, then added more water for serial dilution.
Subset cycles 100 uL reactions QIAEX II yield, Nanodrop (ng/uL) QIAEX II volume (uL) Total yield (ug)
A 15 22 153.2 220 33.704
B 15 22 128.4 220 28.248
C 15 22 155.5 220 34.21
D 15 22 154 230 35.42
E 14 44 124.6 473 58.9358
  • I expected 33 ug on average from each 22reactions and got about the right amount. Using QIAEX II beads saved time instead of performing ethanol precipitation and then Bioneer column purification.

Lambda Exo

Reagent                 Volume
dsDNA+water(~10ug)      125 uL
Lambda Exo buffer,10X   15 uL
Lambda Exo              10 uL
37C 1 hour -> 75C 10 min
  • I set up 3x150 uL reactions for A-D, and 6x150uL reactions for E. I expected <20ug after digestion, so after pooling 3 reactions together in a 2.0 mL tube, I purified with 60 uL QIAEX II beads and 3X volumes QX1 buffer.

USER digestion

  • For every 5 ug ssDNA, use 8 uL of USER (NEB).