Lab Protocols - DNA/RNA
RNA Extraction

RNA was extracted from lab-safe E. coli cells used to test the LAMP reaction. Procedure was completed as described in Qiagen RNeasy Mini kit (1).

Materials
  • Qiagen RNeasy Mini Kit
  • Target Cells
  • 100% Ethanol
  • RNAse-Free Water
  • Centrifuge
Methods
  1. Grow 5 mL of cells. Mix 500 μL of cells with 1,000 μ L RNA protect mixture in a spin column.
  2. Incubate for 5 min. Centrifuge at 10,000 rpm for 1 min and discard the flow-through.
  3. Add TE and lysozyme at 2 mg/mL of the final solution (20 μ L of 100 mg/mL lysozyme and 980 μ L TE). Vortex and incubate at 56°C for 5 mins.
  4. Add 700 μ L of Buffer RLT with BME (2 mL RLT and 20 μ L BME) to the column. Centrifuge at 10,000 rpm discard the flow-through.
  5. Add 500 μ L of 100% EtOH to the column. Centrifuge at 10,000 rpm discard the flow-through.
  6. Continue protocol according to kit Step 7.
Genomic DNA Extraction

Genomic DNA extraction was performed during the preliminary stages of our project in order to test the LAMP protocol. Entire extraction was completed as described in Thermo Fisher GeneJET Genomic DNA Purification Kit (2).

Materials
Methods
  1. Extract genomic DNA according to kit procedure.
PCR DNA Amplification

PCR was carried out as proof-of-concept and to amplify our modified Bst gene fragment. PCR cleanup was completed as described in Thermo Fisher GeneJET PCR Purification kit.

Materials
Methods
  1. Add reaction components in the following volumes:
    • Forward Primer 0.5 μL
      Reverse Primer 0.5 μL
      DNA polymerase 0.5 μL
      DNA polymerase buffer 10 μL
      dNTPs 1 μL
      Template DNA 1 μL
      Betaine 13 μL
      Sterile Water 23.5 μL
      TOTAL 50 μL
  2. Place reaction tube in thermal cycler for the following cycles:
    • Cycle Step Temperature (°C) Time Number of Cycles
      Initial Denaturation 98 1 min 1
      Denaturation 98 10 sec 30
      Annealing primer dependent 30 sec 30
      Extension 72 DNA pol dependent 30
      Final Extension 72 5 min 1
      Termination 4 Indefinite 1
  3. PCR cleanup reaction product according to kit procedure.
DNA Gel Electrophoresis
Materials
Methods
  1. Add 0.5 g of agarose, 50 mL of LB Buffer Solution, and 2.5 μL of Red Safe stain to an Erlenmeyer flask.
  2. Heat the solution in microwave to 1 min and pour into gel electrophoresis chamber. Add comb to the chamber and allow gel to cool and solidify for 40 min.
  3. Pipette 7 μL of DNA Ladder and DNA sample with 1 μL of DNA Loading Dye into separate wells.
  4. Run gel at 120 V for 25 min to measure weight of DNA sample against DNA ladder.
LAMP DNA and RNA Amplification
Materials
Methods
  1. Prepare 10X LAMP primer mix with all primers in a single microfuge tube according to WarmSmart® LAMP Kit protocol.
  2. Store primer mix at -20 °C for 30 min. Vortex primer mix for 5 sec.
  3. Prepare 3 microfuge tubes for positive (all reagents), negative (no RNA template), and negative (no Master Mix). Thaw frozen reagents.
  4. Follow modified WarmSmart® LAMP Kit Reaction Setup protocol.
    • All Reagents No RNA Template No Master Mix
      LAMP 2X Master Mix 12.5 μM 12.5 μM -
      Primer Mix 2.5 µM 2.5 µM 2.5 µM
      Target RNA 2 µM - 2 µM
      HNB 0.5 µM 0.5 µM 0.5 µM
      dH2O 7.5 µM 9.5 µM 20 µM
      Total 25 µM 25 µM 25 µM
  5. Vortex each sample tube and incubate at 65°C for 30 mins.

Click here to see our Protein Expression Protocols

1. MiRNeasy kits. QIAGEN. (n.d.). Retrieved September 30, 2022, from https://www.qiagen.com/us/products/discovery-and-translational-research/dna-rna-purification/rna-purification/mirna/mirneasy-kits/ 
2. GeneJET genomic DNA purification kit. Thermo Fisher Scientific - US. (n.d.). Retrieved September 30, 2022, from https://www.thermofisher.com/order/catalog/product/K0722 
3. GeneJET PCR purification kit. Thermo Fisher Scientific - US. (n.d.). Retrieved September 30, 2022, from https://www.thermofisher.com/order/catalog/product/K0701
4. WarmStart® Lamp Kit (DNA & RNA). New England Biolabs. (n.d.). Retrieved September 30, 2022, from https://international.neb.com/products/e1700-warmstart-lamp-kit-dna-rna