The basic Northern blotting technique is that described
in (Ref. 2). Good results can be obtained by analysing between 10 µg and 30 µg of total RNA on a formaldehyde
gel. Denaturing gels are prepared using 1% agarose (molecular biology grade), 7.2% (v/v) formaldehyde (stock solution is 40%) in 1.1 × MOPS buffer pH 7.0. The RNA is
dissolved in 50% deionised formamide (Sigma), 7.2% (v/v)
formaldehyde and 0.5 × MOPS buffer and heated to 65◦C
for 15 minutes. To each sample is added 2 µl of sample loading buffer and 1 µl of ethidium bromide (1 mg/ml), and
the sample is loaded immediately and electrophoresed at
20 V/cm in 1 × MOPS buffer, until the fast blue (bromophenol blue) is about 3 cm from the bottom of the gel. The
RNA is transferred to a membrane by conventional capillary
blotting (Ref. 2), as shown in (Fig. 1). The membrane to be
used for transfer is a matter of personal preference, however
DuralonTM (Stratagene) gives consistently good results. The
manufacturers recommendations for transfer and hybridisation conditions should be followed for optimal results.
The basic Northern blotting technique is that describedin (Ref. 2). Good results can be obtained by analysing between 10 µg and 30 µg of total RNA on a formaldehydegel. Denaturing gels are prepared using 1% agarose (molecular biology grade), 7.2% (v/v) formaldehyde (stock solution is 40%) in 1.1 × MOPS buffer pH 7.0. The RNA isdissolved in 50% deionised formamide (Sigma), 7.2% (v/v)formaldehyde and 0.5 × MOPS buffer and heated to 65◦Cfor 15 minutes. To each sample is added 2 µl of sample loading buffer and 1 µl of ethidium bromide (1 mg/ml), andthe sample is loaded immediately and electrophoresed at20 V/cm in 1 × MOPS buffer, until the fast blue (bromophenol blue) is about 3 cm from the bottom of the gel. TheRNA is transferred to a membrane by conventional capillaryblotting (Ref. 2), as shown in (Fig. 1). The membrane to beused for transfer is a matter of personal preference, howeverDuralonTM (Stratagene) gives consistently good results. Themanufacturers recommendations for transfer and hybridisation conditions should be followed for optimal results.
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