AlanFung:LabNotes/Probe/2013-12-11

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Revision as of 22:08, 13 December 2013 by >Alan6017518 (→‎GP1_V4 Production PCR)
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GP1 Padlock Probe Production

Overview

  • Expansion PCR
  • Production PCR
  • Exonuclease digestion to generate SS-DNA
  • Removal of amplification adapters
  • Probe purification by PAGE size-selection

Expansion PCR

  • Probe concentration from CustomArray 32.71ng/ul volume 80uL Amount 2.62ug
  • Probe size 146bp

Convert ng/ul to nM

  • Molar Mass of ssDNA probe: 146bp * (325Da/bp) = 146bp * (325 g/mol/bp) = 47450 g/mol
  • (32.71ng/ul * 1*10^6 ul/L) / (47450g/mol) = 689.36nM
  • I will use 100nM final concentration for the expansion PCR

GP1_V4 Expansion PCR

Components 1x rxn (ul) Final Conc
GP-1 (689nM) 14.51 100nM
KAPA SYBR FAST Master Mix (2X) 50 1X
100uM AP1V41U 0.4 400nM
100uM AP2V4 0.4 400nM
H2O 34.69  
Total 100  

GP1_V6 Expansion PCR

Components 1x rxn (ul) Final Conc
GP-1 (689nM) 14.51 100nM
KAPA SYBR FAST Master Mix (2X) 50 1X
100uM pAP1V61U 0.4 400nM
100uM AP2V6 0.4 400nM
H2O 34.69  
Total 100  

Realtime-PCR profile

  • 95C 30sec
  • (95C 10sec → 55C 45sec → 70C 45sec) x 15 cycles
  • 72C 3min
  • Hold at 15C

Qiaquick Column Purification

Purify with one column per reaction

  • In 1.5mL tube, add 6x volume of PB buffer to each tube with PCR product and mix (600ul to 100 ul of PCR product)
  • Transfer 700ul of mixture to each qiaquick column
  • spin at 14,000rpm for 1". Discard supernatant
  • Add 750ul wash buffer to each column
  • spin at 14,000rpm for 1". Discard supernatant
  • repeat wash with wash buffer
  • transfer column to 1.5mL lowbind tube
  • Add 50ul 55C EB buffer to each column and incubate in 37C for 5"
  • Elute DNA by spinning at 14,000 rpm for 1 min.
  • Pool the purified amplicon into the same tube (total volume ~100ul).
  • Measure DNA concentration by Nanadrop and calculate the total yield (dsDNA).
  • Dilute purified 1st round amplicon to 10nM with TE buffer.

Nanodrop

  • GP1_V4:10ng/ul, 112.56nM
  • GP1_V6:9.9ng/ul, 111.44nM
  • Keep 1ul for Gel quantification

Dilute probes to 10nM

  • GP1_V4: Add 0.85ul 112.56nM probes to 8.75ul EBuffer
  • GP1_V6: Add 0.86ul 111.44nM probes to 8.74ul EBuffer

Production PCR (24 wells)

Mix the reaction mix in 50-mL tube Mix well and aliquot 100ul of reaction mix into each well with multichannel pipettes.

GP1_V4 Production PCR

Components 1x rxn (ul) 24x rxn (ul)
10nM 1st round amplicon 0.4 9.6
KAPA SYBR FAST Master Mix (2X) 50 1200
100uM AP1V41U 0.4 9.6
100uM AP2V4 0.4 9.6
H2O 48.8 1171.2
Total 100 2400

GP1_V6 Production PCR

Components 1x rxn (ul) 24x rxn (ul)
1st round amplicon 0.4 9.6
KAPA SYBR FAST Master Mix (2X) 50 1200
100uM pAP1V61U 0.4 9.6
100uM AP2V6 0.4 9.6
H2O 48.8 1171.2
Total 100 2400

Realtime-PCR profile

  • 95C 30sec
  • (95C 10sec → 55C 20sec → 72C 30sec) x 15 cycles
  • 72C 2min
  • Hold at 15C