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Published on: September 24, 2015
High-throughput single copy DNA amplification and cell analysis in engineered nanoliter droplets
Palani Kumaresan1, Chaoyong James Yang, Samantha A Cronier
1Department of Mechanical Engineering, UCSF/UC Berkeley Joint Bioengineering Graduate Group, University of California, Berkeley, California 94720, USA.
Analytical Chemistry
|April 16, 2008
Summary
A novel high-throughput single copy genetic amplification (SCGA) method uses microfluidic droplets for efficient DNA amplification. This technique enables sensitive genetic analysis and long-read sequencing from single molecules and cells.
Area of Science:
- Biotechnology
- Molecular Biology
- Microfluidics
Background:
- Accurate genetic analysis requires efficient amplification of DNA from limited starting material.
- Existing methods can face challenges with low DNA concentrations and throughput.
Purpose of the Study:
- To develop a high-throughput single copy genetic amplification (SCGA) process for DNA and single-cell genetic analysis.
- To enable quantitative, high-yield amplification suitable for long-range sequencing and genetic studies.
Main Methods:
- Utilized a microfluidic droplet generator (microDG) with a hybrid glass-polydimethylsiloxane (PDMS) microdevice.
- Encapsulated individual DNA molecules or cells with primer-functionalized microbeads in nanoliter PCR droplets.
- Integrated a micropump for uniform droplet size, controlled generation frequency, and bead incorporation.
Main Results:
- Achieved quantitative, high-yield amplification of DNA targets (380-1139 bp) from single molecule concentrations using SCGA.
- Demonstrated attomole-scale Sanger sequencing and advanced pyrosequencing read-lengths from amplified products on microbeads.
- Successfully performed single-cell genetic analysis of GAPDH in human lymphocytes and gyr B in E. coli.
Conclusions:
- SCGA is a powerful tool for quantitative genetic analysis of single DNA molecules and cells.
- The developed microfluidic system enables high-throughput genetic analysis with applications in sequencing and diagnostics.
