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High-throughput, high-sensitivity genetic mutation detection by tandem single-strand conformation
Igor V Kourkine1, Christa N Hestekin, Brett A Buchholz
1Department of Chemical Engineering, Northwestern University, Evanston, Illinois 60208, USA.
Analytical Chemistry
|June 19, 2002
Summary
This study optimizes linear polyacrylamide (LPA) for automated DNA mutation detection using single-strand conformation polymorphism (SSCP) and heteroduplex analysis (HA), achieving 100% sensitivity for p53 mutations.
Area of Science:
- Molecular Biology
- Genetics
- Analytical Chemistry
Background:
- Single-strand conformation polymorphism (SSCP) and heteroduplex analysis (HA) are methods for detecting DNA mutations.
- Previous methods required separate analyses, limiting throughput and sensitivity.
Purpose of the Study:
- To optimize linear polyacrylamide (LPA)-based matrices for a tandem SSCP/HA method.
- To develop a high-throughput, automated system for sensitive DNA mutation detection.
Main Methods:
- Developed an optimized sample preparation for one-step SSCP/HA.
- Utilized capillary array electrophoresis (CAE) with poly(N-hydroxyethylacrylamide) (polyDuramide) coating.
- Systematically optimized LPA concentration and molecular weight for peak separation.
Main Results:
- Achieved optimal separation with 6% LPA (Mw 600 kDa) and polyDuramide coating.
- Tandem CAE-SSCP/HA detected 100% of 32 p53 mutations, outperforming individual methods.
- Demonstrated sensitive mutation detection in 11 p53 mutant samples.
Conclusions:
- The optimized tandem CAE-SSCP/HA method provides highly sensitive and specific DNA mutation detection.
- The method is easily adaptable to microfluidic devices for broader application.
- This approach enhances mutation detection sensitivity compared to individual SSCP or HA analyses.