Related Experiment Videos
Two methods to detect DNA fragments produced by restriction enzymes
1Chesapeake Bay Institute, Johns Hopkins University, Shady Side, Maryland 20764.
Analytical Biochemistry
|February 15, 1989
Summary
Two sensitive DNA detection methods visualize small DNA amounts. Direct sulfonation offers a nonradioactive alternative for specific applications, detecting as little as 10 pg DNA.
Area of Science:
- Molecular Biology
- Biochemistry
Background:
- Detecting minute quantities of DNA is crucial in molecular biology.
- Traditional methods may lack sensitivity or require radioactive labeling.
Purpose of the Study:
- To present two sensitive methods for detecting limited amounts of DNA from restriction endonuclease digests.
- To offer alternatives to radiolabeling for DNA fragment visualization.
Main Methods:
- Photographic visualization of ethidium bromide-stained DNA fragments in agarose gels.
- Direct sulfonation of DNA fragments on nylon membranes followed by nonradioactive immunoblot detection.
Main Results:
- The photographic method detects 50-100 pg DNA per band.
- The direct sulfonation method detects 10 pg DNA per band.
- Direct sulfonation is suitable for samples free of contaminating nucleic acids.
Conclusions:
- Both methods offer high sensitivity for detecting limited DNA quantities.
- Direct sulfonation provides a viable nonradioactive alternative to end-labeling.
- These techniques are valuable when DNA is scarce or radiolabeling is restricted.