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        RAPID BIDIRECTIONAL SOUTHERN BLOT FOR CLONED DNA

        互联网

        1493

        A. Process gel

        1. Electrophorese sample in agarose gel, 0.5 to 1 cm thick, 0.5-1.2%.

        2. Expose gel to UV light for 1 min on 265 nM light box (or depurinate in 2 vol of 0.25M HCl for 2X15', and rinse in dH20).

        3. Break & denature DNA with 2 vol of 0.5M NaOH/1.5M NaCl for 2X 15'.

        B. Transfer

        1. Saturate in 0.5M NaOH/1.5M NaCl: 2 sheets of nytran and 6 sheets of 3MM cut to the size of the gel.

        2. Make a sandwich: 3 sheets of wetted 3MM paper with 1 sheet of NC on top. Place gel on top of this. Add another nytran sheet, then 3 more 3MM sheets.

        3. Place a 2 inch layer of paper towels beneath and above the sandwich. Add a weight to ensure even contact.

        4. Transfer at room temp for >1 hr.

        5. Rinse nytran 2 min in 2XSSPE. UV crosslink in a Stratalinker, (or dry by baking 30 min - 2 hr at 80℃ a vacuum oven.)

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

        1. 0.25M HCl 1 gel

        0.25M HCl 20.84 ml conc. HCl (12M)

        H20 to 1000 ml

        2. 0.5N NaOH/1.5M NaCl 1 gel

        0.5N NaOH 50 ml 10N

        1.5M NaCl 87.66 g solid

        H20 to 1000 ml

        --------------------------------------------------------------------------------
        Comments:

        Large fragments (>~5 kb) don't transfer very well by this method, so expect weaker hybridization signals for these large fragments than you will get for smaller ones.

        Must use nytran for this alkaline transfer method - nitrocellulose won't work.

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