Team:iTesla-SoundBio/GelElectrophoresisandGelExtraction

Gel Electrophoresis

  1. Add 50 mL of 1X TAE buffer to a flask
  2. Add 0.5 g of agarose to the TAE
  3. Microwave for approximately 1 min or until the agarose is fully dissolved
  4. Once the solution has cooled to the touch, add 2.5 uL of Smart Glow 20,000X Gel Stain
  5. Pour the solution onto a gel tray with a comb in it
  6. Once it has solidified, put the gel tray into a gel box and cover the gel with TAE. Remove the comb.
  7. Mix samples with 5X loading dye. Load the wells with NEB 1 kb plus ladder and the samples.
  8. Run at 120-140 V until the dye is about 2/3 of the way down the gel.
  9. View under blue light reader.

 

Gel Extraction (with QIAquick Kit from Qiagen)

  1. Excise the band of DNA with a razor blade. Trim as much gel as possible and have the blue light on for a minimal amount of time.
  2. Weigh the gel slice. Add 3 volumes of Buffer QG to the tube containing the slice.
  3. Incubate in a water bath at 50 C until the gel slice has completely dissolved. Vortex every 2-3 minutes to help it dissolve. The color of the solution should be yellow.
  4. Add 1 volume of isopropanol to the mix.
  5. Add sample to a QIAquick spin column inside a 2 mL collection tube and centrifuge for 1 min at 17,900 rcf (13,000 rpm).
  6. Discard flow-through. Add another 500 uL of Buffer QG to the column and centrifuge for another 1 min.
  7. Discard flow-through. Add 750 uL of Buffer PE to the column and spin for 1 min.
  8. Discard flow-through. Centrifuge for an additional 1 min to remove residual ethanol.
  9. Transfer column to a fresh 1.5 mL microcentrifuge tube. Add 30 uL of Elution Buffer to the center of the membrane and let sit for 5 mins.
  10. Centrifuge for 2 mins at 17,900 rcf.
  11. Check concentration of the sample with Nanodrop.