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A microfabricated device for sizing and sorting DNA molecules

H P Chou1, C Spence, A Scherer

  • 1Department of Applied Physics, California Institute of Technology, Pasadena, CA 91125, USA.

Proceedings of the National Academy of Sciences of the United States of America
|January 6, 1999
PubMed
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We developed a novel microfluidic device for single-molecule DNA sizing. This rapid, low-sample-volume method offers high resolution for DNA fragments from 2-200 kilobase pairs.

Area of Science:

  • Biotechnology
  • Molecular Biology
  • Microfabrication

Background:

  • Pulsed-field gel electrophoresis (PFGE) is a standard technique for DNA sizing but is slow and requires large sample volumes.
  • Accurate sizing of large DNA molecules is crucial for various molecular biology applications.
  • Existing methods often lack the speed and sensitivity required for high-throughput analysis.

Purpose of the Study:

  • To demonstrate a microfabricated device for single-molecule DNA sizing.
  • To present a faster and more sample-efficient alternative to traditional DNA sizing methods.
  • To evaluate the device's performance for sizing DNA restriction digests and ladders.

Main Methods:

  • Microfabrication of a single-molecule DNA sizing device.

Related Experiment Videos

  • Utilizing a non-mobility-based approach for size measurement.
  • Testing the device with DNA restriction digests and ladders ranging from 2 to 200 kilobase pairs (kbp).

    • Main Results:

    • The device achieves single-molecule resolution without relying on electrophoretic mobility.
    • It is approximately 100 times faster than pulsed-field gel electrophoresis (PFGE).
    • The device requires a million times less sample than PFGE, with resolution improving for longer DNA molecules.

    Conclusions:

    • The microfabricated device offers a significant advancement in DNA sizing technology.
    • This method provides a rapid, highly sensitive, and accurate alternative for analyzing DNA fragments.
    • The device is suitable for sizing and sorting DNA in the 2-200 kbp range, with potential applications in genomics and molecular diagnostics.