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DNA sequencing by capillary electrophoresis

N J Dovichi1

  • 1Department of Chemistry, University of Alberta, Edmonton, Canada.

Electrophoresis
|February 10, 1998
PubMed
Summary

Capillary electrophoresis for DNA sequencing balances speed and read-length. Optimizing electric fields, temperature, and polymer concentration is key for long genomic sequences.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Analytical Chemistry

Background:

  • Capillary electrophoresis (CE) has been developed for DNA sequencing since 1990.
  • Development followed two main paths: DNA separation physics and large-scale instrument design.

Purpose of the Study:

  • To review the development of capillary electrophoresis for DNA sequencing.
  • To highlight the trade-offs between sequencing speed and read-length.
  • To discuss the requirements for high-throughput CE systems.

Main Methods:

  • Investigated DNA separation by gel electrophoresis at varying electric fields.
  • Examined the impact of electric field strength, temperature, and polymer concentration on read-length.
  • Considered the design of large-scale capillary electrophoresis instruments for parallel sequencing.

Main Results:

  • High electric fields enable rapid DNA sequencing but reduce read-length.
  • Optimal read-length is achieved with modest electric fields, high temperatures, and low-concentration noncrosslinked polymers.
  • High-throughput CE systems necessitate advancements in sample preparation technology.

Conclusions:

  • A fundamental physics trade-off exists between DNA sequencing speed and read-length in CE.
  • Achieving long read-lengths for genomic sequencing requires specific separation conditions.
  • Widespread application of high-throughput CE demands significant investment in sample preparation.

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