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        Yeast Colony PCR--酵母菌落PCR

        互联网

        4361

        This method is more reliable than the old method of adding yeast directly to PCR tubes. No more than 1 microliter of the crude DNA should be added to the 50 microliter PCR reaction because the SDS in the DNA prep can inhibit the PCR reaction.

        Note: These elongation times and annealing temperatures work well for most applications where the product is less than 1.0 kb. These parameters may have to be adjusted for your specific application.

        Platinum Taq (or other hot start Taq) gives more reliable and consistent results than regular Taq for this assay.

        --------------------------------------------------------------------------------

        1. Prepare Yeast DNA (this works best with fresh yeast plates)
        Use a pipetman tip to transfer the equivalent of a medium size yeast colony to 30 microliters of 0.2% SDS

        Vortex ~15 seconds

        Heat in hot block for 4 min at 90 deg. (important for consistent DNA extraction and PCR results)

        Spin in microfuge 1 min. Remove supernatant to a new tube. The crude DNA can be stored at -20 degrees.

        2. PCR Reaction

        Combine the following components on ice:

        5 microliters 10x colony PCR buffer
        1.5 microliters 50 mM MgCl2
        1 microliter 10 mM mix of dNTPs
        10 pmoles of each primer (~100 ng of a 25 mer oligo)
        2 microliters 25% Triton X-100
        0.3 microliter Platinum Taq Polymerase [Invitrogen] (5 u/microliter)
        H2O to a final volume of 49 microliters

        Add mix to PCR tubes on ice containing 1 microliter of the crude DNA prep from above

        3. PCR cycle profile:

        95 deg 1 min
        95 deg 30 sec
        54 deg 1 min (optimum annealing temp varies according to primiers)
        72 deg 1 min
        repeat steps 2 through 4 for a total of 35 cycles
        72 deg 6 min
        hold at 4 deg

        Load 5-10 microliters to Agarose gel for assay.

        For DNA sequencing analysis of product, purify using QIAquick PCR purification kit (Qiagen), eluting the product in 30 microliters. Use ~6 microliters for DNA sequencing analysis.

        --------------------------------------------------------------------------------

        MATERIALS

        0.2% SDS

        10X Colony PCR buffer:
        0.13 M Tris-HCl pH 8.5
        0.56 M KCl


        50 mM MgCl2


        10 mM dNTP mix

        25% Triton X-100

        PCR primers ~25 bases in length specific for the region of interest with annealing temp 55-60 deg.

        <center> <p>  </p> </center>
        上一篇:Isolation of Retroelement from Plant Genomic DNA   下一篇:Colony PCR--菌落PCR
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