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Reuse of denaturing polyacrylamide gels for short tandem repeat analysis
A Tereba1, K A Micka, J W Schumm
1Promega Corporation, Madison, WI, USA.
Biotechniques
|November 20, 1998
Summary
This study presents a cost-effective method for reusing denaturing polyacrylamide gels in short tandem repeat (STR) analysis for forensic and paternity testing. Gels can be reused multiple times after a reverse-electrophoresis step, maintaining sharp sample bands.
Area of Science:
- Biochemistry
- Molecular Biology
- Forensic Science
Background:
- Denaturing polyacrylamide gel electrophoresis is crucial for short tandem repeat (STR) analysis in forensic and paternity testing.
- Preparing gels or using expensive precast gels presents significant drawbacks.
Purpose of the Study:
- To develop a simple, rapid, and cost-effective method for reusing denaturing polyacrylamide gels in STR analysis.
- To reduce the cost and labor associated with gel preparation and precast gels.
Main Methods:
- A novel reverse-electrophoresis step was developed to remove original samples and prepare the gel for subsequent runs.
- Gels were degassed and bonded to plates to prevent distortions and separation.
- The method was validated using a nine-locus multiplex STR system and fluorescent scanning.
Main Results:
- Gels could be successfully reused between 2 and 8 times over several days.
- Sharp sample bands were maintained across multiple runs, although edge effects worsened over time.
- Degassing and bonding techniques eliminated gel distortion and plate separation issues.
Conclusions:
- This reusable gel technique offers a practical and economical alternative for routine STR analysis.
- The method maintains analytical accuracy while significantly reducing costs and preparation time.
- Further optimization could extend gel lifespan and minimize edge effects in forensic applications.