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dsGreen®️ Lyophilized qPCR Kit manual

dsGreen®️ lyophilized qPCR kit is designed to determine the precise content of the DNA matrix in the test sample. It is applicable for gene copy number detection, gene expression analysis, and genotyping using the Real-Time qPCR (RT-qPCR) method. The kit contains hot start (HS) polymerase, which prevents nonspecific amplification. It uses intercalating dye dsGreen for detection.

dsGreen lyophilized qPCR kit reaction mix does not contain ROX reference dye; thus, it is compatible with any real-time DNA amplifier. A reaction mixture volume of 1 mL is good for 100 rxn of 20 µL.

套件組成

套件組成部分 數量
32162
100 反應
31315, Lyophilized Taq polymerase composition with hot start, 100 rxn 1
51215, Polymerase reconstitution buffer, 1 mL 1
11010, dsGreen 用於實時定量PCR, 100× (dsGreen for Real-Time PCR, 100×), 100 uL 1

保存期限 12 個月。

Compatibility with equipment: compatible with any thermocyclers.

Protocol

  1. Dissolve HS Taq polymerase (Component #1) in Polymerase reconstitution buffer (Component #2). For this, add the whole volume of the Component #2 vial into the Component #1 vial. Resuspend carefully and wait until completely dissolved (~5 minutes).
  2. Add 20 µL dsGreen for Real-Time PCR, 100x (Component #3) in the vial. Carefully mix the resulting blend, and spin down the solution using centrifuge.
    Important! After preparing and dsGreen dye adding, store the reaction mixture at −20 °С.
  3. Prepare a reaction mixture according to the table in the proportion per (N+0.1N) reactions, where N is the required number of reactions. Add components in the given order. Carefully vortex the  resulting blend, and spin down the solution using centrifuge.
    Important! The volume of the reaction solution may vary depending on the specific application, but a volume of less than 10 µL is not recommended.
    Calculations for the total volume 20 µL per single reaction:
    The reaction components should be recalculated with the proportion below when using a different reaction volume.
    Component Volume Note
    2х Reaction mix 10 µL —
    Forward primer 0.5–1.5 µL 10 µM solution 5–15 pmol/reaction (final concentration 250–750 nM)
    Reverse primer 0.5–1.5 µL 10 µM solution
    Deionized water Is added to bring to the reaction volume of 20 µL
    DNA 2–9 µL (cDNA, 50–100 ng genomic DNA, 1–100 pg plasmid DNA) Is added separately in each vial (see step 4)
    The total volume of reaction 20 µL
  4. Add the final volume of the reaction mixture in separate PCR tubes without taking into account the volume of the DNA sample. Add DNA samples to each PCR tube, and spin down the solution using centrifuge.
    Important! To obtain reliable and reproducible data, run the PCR reaction at least two times for each DNA sample.

Amplification program

Use the standard method to calculate the primers' melting point (Tm) using Nearest-Neighbor algorithm (SantaLucia J. Jr., 1998). The primer annealing temperature is determined according to the equation: Ta=Tm–5 °C.

If the annealing temperature of the primers ≥60 °C:

Stage Temperature Time Number of cycles
HS Taq polymerase activation 95 °C 5 minutes 1
Denaturation 95 °C 10 seconds 40
Primers annealing combined with elongation (Fluorescence detection should be performed at this stage) 60–72 °C 30–60 seconds

If the annealing temperature of the primers <60 °C:

Stage Temperature Time Number of cycles
HS Taq polymerase activation 95 °C 5 minutes 1
Denaturation 95 °C 10 seconds 40
Primers annealing (Fluorescence detection should be performed at this stage) 55–59 °С 10–15 seconds
Elongation 72 °C 15–30 seconds

Important! After amplification, we recommend performing amplicon melting in a range from 60 up to 95 °С to ensure the absence of nonspecific amplification.

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