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Updated: Jul 22, 2026
11:35
Screening for Functional Non-coding Genetic Variants Using Electrophoretic Mobility Shift Assay (EMSA) and DNA-affinity Precipitation Assay (DAPA)
Published on: August 21, 2016
Fast gel electrophoresis to analyze DNA-protein interactions
P Ramanujam1, S Fogerty, W Heiser
1Pharmacia P-L Biochemicals, Inc., Milwaukee, WI 53202.
Biotechniques
|May 1, 1990
Summary
A new rapid "PhastShift" method offers a faster, easier way to perform DNA gel-shift assays for analyzing DNA-protein interactions. This technique reduces time and technical expertise for reproducible results in molecular biology research.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Gel-shift assays are crucial for studying DNA-protein interactions.
- Conventional methods can be time-consuming and require significant technical expertise.
- Optimizing these assays is essential for efficient molecular biology research.
Purpose of the Study:
- To introduce a rapid and simplified method for electrophoresis of DNA-protein complexes.
- To compare the efficiency and reproducibility of the new method against conventional gel-shift assays.
- To reduce the time, effort, and technical expertise required for DNA-protein binding studies.
Main Methods:
- Utilized the Pharmacia PhastSystem for microprocessor-controlled, high-resolution electrophoresis.
- Employed pre-cast gels and buffer strips for convenience and speed.
- Separated DNA-protein complexes from free DNA using DNA fragments and oligonucleotides with partially purified protein extracts.
Main Results:
- Achieved separation of DNA-protein complexes from free DNA in under one hour.
- Demonstrated that the "PhastShift" method yields reproducible results.
- Showcased the method's effectiveness with various DNA targets and protein extracts.
Conclusions:
- The "PhastShift" method provides a rapid, convenient, and reproducible alternative to conventional gel-shift assays.
- This technique significantly lowers the barrier to entry for studying DNA-protein interactions.
- The optimized method enhances efficiency in molecular biology laboratories.
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