Abstract
The techniques of Southern and Northern blotting have become widely known and are extensively used in the study of molecular genetics. Briefly, DNA is fragmented by incubation with restriction endonucleases and the fragments are then separated by electrophoresis. The double-stranded DNA in the gel is then denatured and transferred to a filter, usually nitrocellulose. This filter is incubated with a 32P-labelled DNA fragment which has a base sequence complementary to the DNA (or RNA) of interest. This fragment will hybridise (‘stick’) to complementary DNA sequences, while unbound DNA may be rinsed off. The position of hybridisation is subsequently detected by autoradiography. The technique is called Southern blotting in the case of DNA/DNA hybrids and Northern blotting when RNA is subjected to electrophoresis followed by formation of RNA/DNA hybrids.
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Abbreviations
- DBM:
-
Diazobenzyloxymethyl
- DPT:
-
Diazophenylthioether
- DEAE:
-
Diethylaminoethyl
Further Reading
Barinaga, M., Franco, R., Meinkoth, J., Ong, E. and Wahl, G.M. (1981) Methods for the Transfer of DNA, RNA and Protein to Nitrocellulose and Diazotized Paper Solid Supports. A Schleicher and Scheull Manual
Bio-Rad Laboratories Manual (1983) Bio-Dot Microfiltration Apparatus Instruction Manual
Bresser, J. and Gillespie, D. (1983) Quantitative Binding of Covalently Closed Circular DNA to Nitrocellulose in Nal, Anal. Biochem., 129, 357–364
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© 1987 John M. Walker and Wim Gaastra
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van Helden, P.D., Olliver, C.L. (1987). The Dot-Blot Technique. In: Walker, J.M., Gaastra, W. (eds) Techniques in Molecular Biology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-9799-5_10
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DOI: https://doi.org/10.1007/978-1-4615-9799-5_10
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