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MOLECULAR BIOLOGY: WORKING WITH DNA

NORTHERN ANALYSIS

Washing Northern Blots

Washing Northern Blots
Contributor: The Laboratory of Michael Chamberlin at the University of California, Berkeley
 
Overview
See a Protocol for the Electrophoresis of RNA through Agarose-Formaldehyde Gels and see a Protocol for Northern Blotting to obtain instructions on RNA transfer, making the required probe, and probe/filter hybridization.
 
Procedure
1. Following an overnight hybridization of a filter with a probe, place the filter in 2X SSC (prewarmed) at 37°C for 30 min with gentle shaking.

2. Pour off solution and replace with 100 to 300 ml of Wash Buffer 1 and wash the filter for 15 min at 50°C with gentle shaking. Repeat this wash step one time.

3. Pour off the solution and replace it with 100 to 300 ml of Wash Buffer 2 and wash the filter for 15 min at 50°C with gentle shaking. Repeat this wash step one time.

4. Pour off the solution and replace it with 100 to 300 ml of Wash Buffer 3 and wash filter for 15 min at 50°C with gentle shaking. Repeat this wash step one time.

5. Pour off the solution and replace it with 100 to 300 ml of Wash Buffer 4 and wash the filter for 10 min at 50°C with gentle shaking. Repeat this wash step one time.

6. Dry the filter by placing it under a heat lamp for 5 to 10 min.

7. Autoradiograph the blot.

Solutions
10% (w/v) SDS
Phosphate Wash Buffer (25X)   0.2 M Sodium Phosphate Dibasic (KH2PO4)
1.5% (w/v) Sodium Pyrophosphate
0.3 M Sodium Phosphate Monobasic (Na2HPO4)
SSC (20X)   pH 7.2
3 M NaCl
0.3 M Sodium Citrate
Wash Buffer 4   0.25X SSC
0.0125% (w/v) SDS
0.125X Phosphate Wash Buffer
Wash Buffer 3   0.25X Phosphate Wash Buffer
0.025% (w/v) SDS
0.5X SSC
Wash Buffer 2   0.05% (w/v) SDS
1X SSC
0.5X Phosphate Wash Buffer
Wash Buffer 1   0.1% (w/v) SDS
1X Phosphate Wash Buffer
2X SSC
 
BioReagents and Chemicals
Oligonucleotide
Sodium Phosphate, Dibasic
Sodium Pyrophosphate
SDS
Sodium Chloride
Sodium Phosphate, Monobasic
Sodium Citrate
 
Protocol Hints
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