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        PCR Reagent System

        互联网

        1159

        实验步骤

         

        1. Routine Protocol

        The following protocol is optimized for the control DNA and the primers provided with this kit. This protocol may serve as a starting point for any PCR amplification. Critical parameters to optimize include incubation times and temperatures, concentration of Taq DNA Polymerase, primers, MgCl2, and template DNA (2). Since PCR is a powerful technique capable of amplifying trace amounts of DNA, all appropriate precautions should be taken to avoid cross-contamination. Amplification reactions should be assembled in a DNA-free environment. Use of "clean" dedicated automatic pipettors and aerosol resistant barrier tips are recommended. Always keep the control DNA and other templates to be amplified isolated from the other components. PCR products should be analyzed in an area separate from the reaction assembly area.

         1) Add the following components to a sterile 0.5-mL microcentrifuge tube on ice:

         2) Cap the tubes and centrifuge briefly to collect the contents to the bottom of the tube.

         3) Incubate the tubes in a thermocycler at 94° C for 3 min to completely denature the template.

         4) Perform 35 cycles of PCR amplification at:

        a. Denature: 94° C for 45 s

        b. Anneal: 55° C for 30 s

        c. Extend: 72° C for 1 min 30 s

         5) Incubate for an additional 10 min at 72° C and maintain the reaction at 4° C. The samples can be stored at –20° C until use.

         6) Analyze the amplification products by agarose gel electrophoresis and visualize by ethidium bromide staining. Use appropriate molecular weight standards.

        2. "Hot-Start" Protocol

        1) Add all the components as in Basic Protocol, except Taq DNA Polymerase.

        2) Cap the tubes and centrifuge briefly to collect the contents to the bottom of the tube.

        3) Incubate the tubes in a thermal cycler at 94° C for 3 min to completely denature the template.

        4) After denaturation at 94° C, maintain the reaction at 80° C.

        5) Add 0.5 μL of Taq DNA Polymerase (2.5 U) to each reaction. Be certain to add the enzyme beneath the layer of silicone oil.

        6) Continue with 35 cycles of denaturation annealing and extension as in Basic Protocol.

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