Employing Digital Droplet PCR to Detect BRAF V600E Mutations in Formalin-fixed Paraffin-embedded Reference Standard Cell Lines

The overall goal of this experiment is to isolate human genomic, DNA from formal and fixed paraffin embedded reference standard cell lines using a tissue preparation system, followed by analyzing the bra V 600 E mutations in the genomic DNA using digital droplet. P-C-R-D-D-P-C-R Can help answer key questions in molecular oncology, such as the presence and abundance of RA sequence mutation and quantification of nucleic acid at low template copy numbers. Although this method are being demonstrated in AEP since standard cell lines, they can also be used in other bio samples just to make sure you optimize the conditions for isolating your DNA of interest.

This tissue preparation system can be used to isolate up to 48 samples of contaminant free human genomic DNA Within four hours when compared to other manual procedures. This system is somewhat expensive for preparation because of the usage of magnetic bead. However, it is safer and produced and cleage of high quality Demonstrating the pressure will be ssu A and a technician from our laboratory.

DNA extraction will be performed in a fully automated DNA isolation instrument using the tissue preparation system or TPS protocol. Start by turning on the instrument and the computer. Open the run control software and insert an auto load tray into the TPS deck loading area.

Next, dispense reagents into their corresponding troughs as shown in this figure place the four samples in the sample carrier rack. Ensure proper mixing of the lysis buffer and wash buffers by inverting them three to five times and then load them into the respective troughs in column four. After inverting a few times or mild vortexing, load the elucian buffer magnetic beads and FFPE buffer into the small troughs in column five, leaving two slots empty where indicated.

Load a two milliliter deep well plate onto the plate carrier. Before starting a run UNC cap all tubes and reagent troughs. Confirm that sufficient capacity is available in the liquid waste bottle and that the solid waste bottle is empty and lined with a biohazard bag.

Confirm that the tip eject plate is centered in the waste assembly. Close the front cover, start the software, open the NA prep main ML starlet. Do med file.

Click start. The instrument status will switch from idle to running. Enter the number of samples for this run.

Choose the desired method for this run. Enter the position of the first high volume tip, selecting one. If all trays are full, enter the position of the first standard volume tip selecting one.

If all trays are full, the instrument will run through the automated steps without user intervention. A detailed workflow is shown here to avoid contamination. Follow standard precautions such as wearing gloves and using a clean PCR hood.

Clean pipettes and low protein binding tubes. Assemble the reaction mixtures in PCR tube strips, thaw and equilibrate the reaction components to room temperature. The human genomic DNA sample for digital droplet, PCR or D-D-P-C-R analysis must have a minimum concentration of 3.3 nanograms per microliter.

Prepare the PCR reactions. Combine the two X-D-D-P-C-R super mix 20 x forward and reverse primers and probe with each purified DNA sample and make up to 20 microliters with distilled water. Vortex the mix thoroughly to ensure homogeneity and briefly centrifuge to collect the contents at the bottom of the tubes before dispensing.

Operate the droplet generator per the manufacturer's recommended protocol. Insert the cartridge into the holder with a notch in the cartridge positioned on the upper left side of the holder. Add 20 microliters of reaction mix containing samples into the middle wells and 70 microliters of generator oil into the bottom wells.

Attach the gasket across the top of the cartridge. Ensure that the gasket is securely hooked on both ends of the holder. Otherwise, sufficient pressure for droplet generation will not be achieved.

Open the droplet generator by pressing the green button on the top of the instrument. Insert the cartridge when the holder is in the correct position. Both the power and holder indicator lights are green.

Press the top button on the instrument again to close the door and initiate droplet generation. The droplet indicator light flashes green after 10 seconds to indicate that droplet generation is in progress. When droplet generation is complete, all three indicator lights will change to solid green.

Open the door by pressing the button and remove the holder from the unit. Remove the disposable gasket from the holder and discard it. Note that the top wells of the cartridge contain the droplets and the middle and lower wells are nearly empty with a small amount of residual oil following droplet generation.

Prepare for conventional PCR amplification. For each sample pipe had out 40 microliters of the droplet contents from the top well of the cartridges into a single well of a recommended 96 well PCR plate as indicated in the manufacturer's instrument protocol, aspirate the droplet slowly and gently to minimize droplet shearing during transfers. Immediately after transferring the droplets, the PCR plate must be sealed To avoid evaporation.

Set the plate sealer temperature to 180 degrees Celsius and the time to five seconds. Touch the arrow to open the tray door. Position the support block on the tray with the 96 well side facing up.

Place the 96 well plate onto the support block and ensure that all plate wells are aligned with the support block cover. The 96 well plate with one sheet of foil seal Use parable foil plate seals that are compatible with a PCR plate sealer and the needles in the droplet reader. Once the 96 well plate is secured on the support block and covered with a curable foil seal.

Touch the seal button. The tray will close and heat ceiling will initiate. When heat sealing is complete, the door will open automatically.

Remove the plate from the heat block and then remove the heat block. Ensure that all the wells in the plate are sealed by checking the depressions in. The foil are readily apparent over each well.

Once sealed, the plate is ready for thermal cycling. Perform conventional PCR amplification by following the parameters detailed in the protocol text. Once PCR amplification of the nucleic acid target in the droplets is complete.

The next step is to analyze each droplet individually using a two color detection system. Typically, the droplet reader instrument is set to detect FAM and VIC reporter fluoro fours. Click flush system to prime the droplet reader and make it ready for D-D-P-C-R analysis.

Load the plate into the droplet reader and click start. When droplet reading is complete, open the door and remove the plate holder from the unit.Remove. Remove the 96 wall plate from the holder and discard it.

Subsequently perform DNA mutation profiling using data analysis software as described in the protocol text. In this D-D-P-C-R analysis, the RAF V 600 E mutations were studied. Fluorescence was detected and processed into a two dimensional scatterplot display.

Custom software was used to draw appropriate gates and the number of droplets within each gate was counted. Droplets represented by blue dots above the pink cutoff line for all samples are positive. For mutated RAF V 600 E Wild type bra droplets are represented by green dots in both plots.

The gray dots at the bottom are considered as the fluorescence background. The overall mutant allele frequencies were then calculated based on the relative percentages of wild type bra and brav V 600 E template concentrations detected One semester. HR with the individual analysis can be performed within four Hours following this posture.

Other samples like A PPT liquid biopsy can be performed in order to answer additional questions like cancer progression monitoring After its development. This technique paved the way for researchers in the field of companion diagnostics to explore various mutation detections in the molecular oncology field. After watching this video, you should have a good understanding of how to perform the tissue preparation system and digital droplet P-C-R-S-A for a specific point, DNA mutation detection.