Related Experiment Videos
Isothermal DNA amplification coupled with DNA nanosphere-based colorimetric detection
Eric Tan1, Jennifer Wong, Doris Nguyen
1Keck Graduate Institute of Applied Life Sciences, and Harvey Mudd College, Claremont, California 91711, USA.
Analytical Chemistry
|December 15, 2005
Summary
This study introduces a rapid DNA detection method using isothermal amplification (EXPAR) and gold nanospheres for visual readout. The assay detects low DNA concentrations in minutes, enabling point-of-care diagnostics.
Area of Science:
- Molecular Biology
- Nanotechnology
- Biochemistry
Background:
- Accurate and rapid detection of short DNA sequences is crucial for molecular diagnostics.
- Existing methods often require complex instrumentation and lengthy assay times.
- There is a need for simple, sensitive, and fast DNA detection platforms.
Purpose of the Study:
- To develop a novel, rapid, and simple method for detecting short DNA sequences.
- To combine isothermal amplification with a colorimetric readout for visual detection.
- To enable potential point-of-care molecular diagnostic applications.
Main Methods:
- Utilized Exponential Amplification Reaction (EXPAR) for isothermal DNA amplification.
- Employed DNA-functionalized gold nanospheres for colorimetric detection via aggregation.
- Developed a universal reporter oligonucleotide for bridging nanospheres.
- Enhanced color change visualization using C18 reversed-phase thin-layer chromatography plates.
Main Results:
- Achieved >10(6)-fold amplification/conversion in under 5 minutes using EXPAR.
- Demonstrated visual color change (red to purple/blue) upon nanosphere aggregation.
- Detected as low as 100 fM trigger oligonucleotide in under 10 minutes total assay time.
- Showcased minimal reagent consumption and no requirement for specialized instrumentation.
Conclusions:
- The developed assay is simple, rapid, and highly sensitive for DNA sequence detection.
- The method is versatile and adaptable for detecting various trigger oligonucleotides.
- This approach holds significant promise for developing rapid, point-of-care molecular diagnostic tools.